A wideband linear power supply configurable output current limit protection circuit, method and regulator

Abstract

The application discloses a wideband linear power supply configurable output current-limiting protection circuit and method and a voltage stabilizer. The current of a transistor is sampled to the transistor of the voltage stabilizer, the current passes through an externally configured resistor, and the voltage across the externally configured resistor is in a certain proportional relationship with the current of the output transistor of the voltage stabilizer. Signal processing voltage compares and processes the voltage on the externally configured resistor and the output voltage of the voltage stabilizer. When the current density of the sampling transistor is equal to the current density of the transistor of the voltage stabilizer, the voltage across the externally configured resistor is equal to the output voltage, the working state of the current-limiting loop is established, and the output current of the voltage stabilizer is limited. When the output end of the voltage stabilizer is short-circuited to the ground, the current-limiting loop closes the voltage stabilizing loop, the output of the linear voltage stabilizer is closed, and no current can be output externally. The output current limiting value of the voltage stabilizer can be flexibly set through the externally configured resistor, and the voltage stabilizer is forced to be closed when short-circuited to the ground, so that damage of the voltage stabilizer in an abnormal working state is effectively avoided.

Description

Technical Field

[0001] This invention belongs to the field of power management integrated circuit technology, and relates to a broadband linear power supply configurable output current limiting protection circuit, method and voltage regulator. Background Technology

[0002] As process integration continues to improve, system chips or data link chips are becoming increasingly complex and large in scale, all of which are powered by high-current, high-speed linear power supplies. Linear power supplies are used in high-current load conditions, and the current flowing through power transistors is relatively large. However, it is difficult to ensure that the current density of power transistors over a large area is consistent. When they are operating under overcurrent or short-circuit conditions to ground, local hot spots will appear, causing power transistors to burn out and the chip to be permanently damaged.

[0003] Current current-limiting protection circuit design technology for linear power supplies samples the power transistor circuit according to a certain proportional relationship. After signal processing, it controls the voltage of the power transistor or the output current of the error amplifier to achieve the function of limiting the output current of the linear power supply. When the circuit is in an overcurrent or short-circuit operating state, this technology can limit the output current of the regulator to a certain value. However, when it is in a current-limiting state for a long time, the chip's own power consumption is very high, and local hot spots may appear in the power transistor, leading to damage to the power transistor and circuit failure, which seriously affects the user experience. Summary of the Invention

[0004] The purpose of this invention is to solve the problem in the prior art that the circuit fails when the circuit is in an overcurrent or short-circuit operating state, even when current limiting is implemented, and to provide a broadband linear power supply configurable output current limiting protection circuit, method and regulator.

[0005] To achieve the above objectives, the present invention employs the following technical solution:

[0006] The present invention proposes a broadband linear power supply configurable output current limiting protection circuit, including a sampling circuit and a signal processing circuit connected to a voltage regulator;

[0007] One input port of the sampling circuit is connected to the output node of the voltage regulator's buffer, and the other input port of the sampling circuit is connected to the power supply node of the voltage regulator. The output port of the sampling circuit is connected to one input of the signal processing circuit, and the other input of the signal processing circuit is connected to the output node of the voltage regulator. The output port of the signal processing circuit is connected to the output node of the voltage regulator's error amplifier.

[0008] Preferably, the sampling circuit includes a fourth resistor R4 and a second transistor Q. n2 The second node a2, the third node a3, and the external configuration resistor R5;

[0009] One end of the fourth resistor R4 is connected to node a1, the output terminal of the voltage regulator's buffer, and the other end of the fourth resistor R4 is connected to node a3; the second transistor Q n2 The base of the transistor is connected to the third node a3, and the second transistor Q is connected to the third node a3. n2 The collector is connected to the power supply node V of the voltage regulator. CNTL The second transistor Q n2 The emitter is connected to the second node a2; one end of the external configuration resistor R5 is connected to the second node a2, and the other end of the external configuration resistor R5 is grounded.

[0010] Preferably, the voltage across the external configuration resistor R5 is related to the voltage across the second transistor Q. n2 The current is directly proportional to the current.

[0011] Preferably, the signal processing circuit includes an eighth node a8 and a third transistor Q. n3 Zero node a0, ninth node a9, fifth node a5, sixth node a6, fourth transistor Q n4 The fifth transistor Q n5 Fourth node a4, sixth node a6, transistor Q lp1 transistor Q lp2 transistor Q lp3 transistor Q lp4 transistor Q lp5 transistor Q lp6 transistor Q lp7 and transistor Q lp8 ;

[0012] Third transistor Q n3 Base connection node V REF The third transistor Q n3 The emitter is connected to the zero node a0, and the third transistor Q n3 The collector is connected to the eighth node a8; transistor Q lp1 The base is connected to the eighth node a8, transistor Q lp1 emitter connection node V CNTL transistor Q lp1 The collector is connected to the eighth node a8; transistor Q lp2 The base is connected to the eighth node a8, transistor Q lp2 emitter connection node V CNTL transistor Q lp2 The collector is connected to the ninth node a9; transistor Q lp3 The base of transistor Q is connected to the second node a2. lp3 The emitter is connected to the ninth node a9, transistor Q lp3 collector connection node GND; transistor Q lp4The base of the transistor is connected to the ninth node a9, and the transistor Q is connected to the ninth node a9. lp4 The emitter is connected to the fifth node a5, transistor Q lp4 collector connection node GND; transistor Q lp5 The base is connected to the eighth node a8, transistor Q lp5 emitter connection node V CNTL transistor Q lp5 The collector of the transistor is connected to the fourth node a4; transistor Q lp6 The base is connected to the output node V of the voltage regulator. OUT transistor Q lp6 The emitter is connected to the fourth node a4, transistor Q lp6 collector connection node GND; transistor Q lp7 The base is connected to the eighth node a8, transistor Q lp7 emitter connection node V CNTL transistor Q lp7 The collector of the transistor is connected to the fifth node a5; transistor Q lp8 The base of the transistor is connected to the fourth node a4, and the transistor Q is connected to the fourth node a4. lp8 The emitter is connected to the fifth node a5, transistor Q lp8 The collector is connected to the sixth node a6; the fourth transistor Q n4 The base is connected to the sixth node a6, and the fourth transistor Q. n4 The emitter is connected to the GND node, and the fourth transistor Q is connected to the ND node. n4 The collector of the transistor is connected to the sixth node a6; the fifth transistor Q n5 The base connection node a6, the fifth transistor Q n5 The emitter is connected to the GND node, and the fifth transistor Q is connected to the ND node. n5 The collector is connected to the seventh node a7.

[0013] Preferably, the voltage regulator operates normally when it is unloaded or lightly loaded.

[0014] Preferably, when the voltage regulator is under heavy load, the current of the voltage regulator is limited.

[0015] Preferably, the voltage regulator stops working when it is in a short-circuit state to ground.

[0016] Preferably, the input power supply V CNTL The voltage is 3V to 16V.

[0017] The present invention proposes a current limiting method for a configurable output current limiting protection circuit for a broadband linear power supply, comprising the following steps:

[0018] The data from the output of the voltage regulator's buffer and the power supply of the voltage regulator are transmitted to the sampling circuit to obtain the current of the voltage regulator.

[0019] The data from the output node of the voltage regulator and the current of the voltage regulator are input to the signal processing circuit to control the current at the output terminal of the voltage regulator.

[0020] The present invention proposes a voltage regulator that uses a broadband linear power supply with a configurable output current limiting protection circuit.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] This invention proposes a configurable output current-limiting protection circuit for a broadband linear power supply. The input of a sampling circuit is connected to the output of a buffer to sample the current of the power transistor output by the voltage regulator. One input of a signal processing circuit is connected to the sampling circuit, and the other input is connected to the output of the voltage regulator. The output of the signal processing circuit is connected to the output of the voltage regulator's error amplifier. When the voltage regulator is in an overcurrent state, the output current of the voltage regulator buffer is controlled to achieve the target of limiting the voltage regulator's output current. That is, when the load current exceeds the output current limit, the voltage regulator's output voltage is reduced, and the output current capability is weakened to reduce the chip's own power consumption. When the voltage regulator output is short-circuited to ground, it is an abnormal situation; the power transistor is turned off, and its own power consumption is zero. Using this method to design the current-limiting protection circuit, the power transistor will not fail due to localized hot spots when there is an overcurrent or a short circuit to ground at the output. Therefore, the protection circuit proposed in this invention adjusts the output current limit value of the voltage regulator through the sampling circuit, and can adjust the maximum output current of the voltage regulator according to the actual operating state of the application. This current-limiting protection circuit not only achieves the function of limiting the output current but also ensures that the circuit does not fail.

[0023] Furthermore, when the voltage regulator is short-circuited to ground, it is effectively protected from damage, and the circuit structure is simple and low in cost.

[0024] This invention proposes a current limiting method for a configurable output current limiting protection circuit for a broadband linear power supply. By combining the voltage regulator with a sampling circuit and a signal processing circuit, the current at the output terminal of the voltage regulator can be controlled, effectively protecting the voltage regulator from damage. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 The diagram shows the structure of the linear power supply configurable output current limiting protection circuit of the present invention.

[0027] Figure 2The circuit diagram for the configurable output current limiting protection of the linear power supply of the present invention is shown. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0030] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0031] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0032] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0033] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0034] The present invention will now be described in further detail with reference to the accompanying drawings:

[0035] This invention proposes a configurable output current limiting protection circuit for a broadband linear power supply, such as... Figure 1 As shown, this circuit consists of a sampling circuit and a signal processing circuit transistor. The input of the sampling circuit is connected to the output of the buffer and is used to sample the current of the power transistor output by the voltage regulator. This current passes through an external configuration resistor, and the voltage across the external configuration resistor is directly proportional to the current of the power transistor. The signal processing circuit compares the voltage across the external configuration resistor with the voltage regulator output voltage and converts it into an output current. When the circuit is in normal operation, the signal processing circuit output is in a high-impedance state, which does not affect the normal operation of the voltage regulator. When the power transistor current exceeds a certain value, the voltage across the external configuration resistor exceeds the voltage regulator output voltage. The signal processing circuit outputs a pull-down current to suppress the input current of the buffer and control the voltage regulator output current to increase further. If the load current continues to increase, the pull-down current of the signal processing circuit increases further, the buffer output circuit output is lower than normal, and the voltage regulator output voltage decreases. When the output is short-circuited to ground, V... OUT When the input current is 0, the pull-down current of the signal processing circuit is large, pulling the output current of the error amplifier to the ground port. The input current of the buffer is 0, and the power transistor is turned off.

[0036] An example circuit of the present invention for a configurable output current limiting protection circuit for a linear power supply is as follows: Figure 1 As shown, it includes a sampling circuit 100 and a signal processing circuit 200.

[0037] like Figure 1 As shown, in the sampling circuit 100, one end of the fourth resistor R4 is connected to the first node a1 of the buffer output of the voltage regulator, and the other end is connected to the second transistor Q. n2 The base third node a3; the second transistor Q n2 The base of the transistor is connected to the third node a3, and the second transistor Q is connected to the third node a3. n2 The collector is connected to the power supply terminal V. CNTL The second transistor Q n2 The emitter is connected to the second node a2; one end of the external configuration resistor R5 is connected to the second node a2, and the other end is grounded; one input terminal of the signal processing circuit is connected to the output node V of the voltage regulator. OUT The other input terminal is connected to the second node a2, and the output port is connected to the error amplifier output of the regulator at the seventh node a7.

[0038] The signal processing circuit 200 is as follows: Figure 2 As shown, the second node a2 is an input terminal of the signal processing circuit, connected to one end of the external configuration resistor R5, and sampling the voltage across the resistor; VOUT This is another input terminal of the signal processing circuit, connected to the output port of the voltage regulator; the seventh node a7 is the output terminal of the signal processing circuit, connected to the output of the error amplifier of the voltage regulator. The third transistor Q... n3 Base connection node V REF Its voltage is the reference voltage, the emitter is connected to the zero node a0, and the collector is connected to the eighth node a8; transistor Q lp1 The base is connected to the eighth node a8, transistor Q lp1 emitter connection node V CNTL transistor Q lp1 The collector is connected to the eighth node a8; transistor Q lp2 The base is connected to the eighth node a8, transistor Q lp2 emitter connection node V CNTL transistor Q lp2 The collector is connected to the ninth node a9; transistor Q lp3 The base of transistor Q is connected to the second node a2. lp3 The emitter is connected to the ninth node a9, transistor Q lp3 collector connection node GND; transistor Q lp4 The base of the transistor is connected to the ninth node a9, and the transistor Q is connected to the ninth node a9. lp4 The emitter is connected to the fifth node a5, transistor Q lp4 collector connection node GND; transistor Q lp5 The base is connected to the eighth node a8, transistor Q lp5 emitter connection node V CNTL transistor Q lp5 The collector of the transistor is connected to the fourth node a4; transistor Q lp6 The base is connected to the output node V of the voltage regulator. OUT transistor Q lp6 The emitter is connected to the fourth node a4, transistor Q lp6 collector connection node GND; transistor Q lp7 The base is connected to the eighth node a8, transistor Q lp7 emitter connection node V CNTL transistor Q lp7 The collector of the transistor is connected to the fifth node a5; transistor Q lp8 The base of the transistor is connected to the fourth node a4, and the transistor Q is connected to the fourth node a4. lp8 The emitter is connected to the fifth node a5, transistor Q lp8 The collector is connected to the sixth node a6; the fourth transistor Q n4 The base is connected to the sixth node a6, and the fourth transistor Q. n4 The emitter is connected to the GND node, and the fourth transistor Q is connected to the ND node. n4The collector of the transistor is connected to the sixth node a6; the fifth transistor Q n5 The base connection node a6, the fifth transistor Q n5 The emitter is connected to the GND node, and the fifth transistor Q is connected to the ND node. n5 The collector is connected to the seventh node a7.

[0039] The working principle of a configurable output current limiting protection circuit for a linear power supply is explained below:

[0040] When the linear regulator is under no-load or light-load conditions, the first transistor Q n1 The quiescent current is very small, and the second transistor Q... n2 The static current is also very small, and the voltage across the external configuration resistor R5 is much smaller than the voltage output of the regulator. The output of the signal processing circuit 200 is in a high-impedance state, and the linear regulator is working normally.

[0041] When the linear regulator is under heavy load, the load current continues to increase, and the second transistor Q... n2 The current density is equal to the output power transistor Q of the voltage regulator. n1 At a current density of , the voltage across the external resistor R5 is equal to the regulator output voltage V. OUT , Figure 2 medium transistor Q lp8 Turn on, fourth transistor Q n4 When the circuit is turned on, and through a mirror relationship, the fifth transistor Qn5 turns on, limiting the increase of the buffer input current. Thus, the output current of the regulator cannot continue to increase, achieving the current limiting function.

[0042] When the linear regulator is short-circuited to ground, the second transistor Q, through mirroring, n2 It has a large quiescent current, and the voltage across resistor R5 is relatively large, such as Figure 2 As shown, transistor Q lp3 With a high base voltage, it is in the off state. The voltage at node a9 is approximately the supply voltage, therefore transistor Qlp4 is off, and transistor Q... lp6 Base voltage (node ​​V) OUT When the current is zero, it is in the on state, and the voltage at node a4 is approximately 0.3V. Therefore, all the current in the current mirror transistor Qlp7 flows to the fourth transistor Q. n4 The fifth transistor Q n5 If the quiescent current is equal to the current of the current mirror transistor Qlp7, then the fifth transistor Q... n5 By pulling the maximum output current of the error amplifier to ground and setting the buffer input current to 0, the linear regulator is turned off, thus achieving the function of shutting off the linear regulator output from ground short circuit.

[0043] The present invention proposes a current limiting method for a configurable output current limiting protection circuit for a broadband linear power supply, comprising the following steps:

[0044] The data from the output of the voltage regulator's buffer and the power supply of the voltage regulator are transmitted to the sampling circuit to obtain the current of the voltage regulator.

[0045] The data from the output node of the voltage regulator and the current of the voltage regulator are input to the signal processing circuit to control the current at the output terminal of the voltage regulator.

[0046] Experimental results show that a configurable output current limiting protection circuit for linear power supplies designed based on this invention has an input power supply V CNTL With a voltage range of 3V to 16V, the output current limit value is configured by an external resistor. It is widely used in linear voltage regulators to achieve current limiting protection and effectively avoid damage when the voltage regulator is in an abnormal working state.

[0047] This invention proposes a configurable output current-limiting protection circuit for a broadband linear power supply. When the load current exceeds the output current limit, the circuit reduces the regulator's output voltage and weakens its output current capability to lower the chip's power consumption. When the regulator output is short-circuited to ground, it's considered an abnormal situation; if the power transistor can be turned off, its power consumption is zero. Using this method, the power transistor will not fail due to localized hot spots when there is overcurrent or a short circuit to ground. This invention uses an external resistor to adjust the regulator's output current limit, allowing adjustment of the regulator's maximum output current according to the actual application's operating conditions. This current-limiting protection circuit not only limits the output current but also effectively protects the regulator from damage when it is short-circuited to ground. Furthermore, the circuit structure is simple and low-cost.

[0048] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A broadband linear power supply configurable output current limiting protection circuit, characterized in that, This includes the sampling circuit and signal processing circuit connected to the voltage regulator; One input port of the sampling circuit is connected to the output node of the buffer of the voltage regulator, the other input port of the sampling circuit is connected to the power supply node of the voltage regulator, the output port of the sampling circuit is connected to one input of the signal processing circuit, the other input of the signal processing circuit is connected to the output node of the voltage regulator, and the output port of the signal processing circuit is connected to the output node of the error amplifier of the voltage regulator. The signal processing circuit includes an eighth node a8 and a third transistor Q. n3 Zero node a0, ninth node a9, fifth node a5, sixth node a6, fourth transistor Q n4 The fifth transistor Q n5 Fourth node a4, sixth node a6, transistor Q lp1 transistor Q lp2 transistor Q lp3 transistor Q lp4 transistor Q lp5 transistor Q lp6 transistor Q lp7 and transistor Q lp8 ; Third transistor Q n3 Base connection node V REF The third transistor Q n3 The emitter is connected to the zero node a0, and the third transistor Q n3 The collector is connected to the eighth node a8; transistor Q lp1 The base is connected to the eighth node a8, transistor Q lp1 emitter connection node V CNTL transistor Q lp1 The collector is connected to the eighth node a8; transistor Q lp2 The base is connected to the eighth node a8, transistor Q lp2 emitter connection node V CNTL transistor Q lp2 The collector is connected to the ninth node a9; transistor Q lp3 The base of transistor Q is connected to the second node a2. lp3 The emitter is connected to the ninth node a9, transistor Q lp3 Collector connection node GND; transistor Q lp4 The base of the transistor is connected to the ninth node a9, and the transistor Q is connected to the ninth node a9. lp4 The emitter is connected to the fifth node a5, transistor Q lp4 Collector connection node GND; transistor Q lp5 The base is connected to the eighth node a8, transistor Q lp5 emitter connection node V CNTL transistor Q lp5 The collector of the transistor is connected to the fourth node a4; transistor Q lp6 The base is connected to the output node V of the voltage regulator. OUT transistor Q lp6 The emitter is connected to the fourth node a4, transistor Q lp6 collector connection node GND; transistor Q lp7 The base is connected to the eighth node a8, transistor Q lp7 emitter connection node V CNTL transistor Q lp7 The collector of transistor Q is connected to the fifth node a5; lp8 The base of the transistor is connected to the fourth node a4, and the transistor Q is connected to the fourth node a4. lp8 The emitter is connected to the fifth node a5, transistor Q lp8 The collector is connected to the sixth node a6; the fourth transistor Q n4 The base is connected to the sixth node a6, and the fourth transistor Q. n4 The emitter is connected to the GND node, and the fourth transistor Q is connected to the ND node. n4 The collector of the transistor is connected to the sixth node a6; the fifth transistor Q n5 The base connection node a6, the fifth transistor Q n5 The emitter is connected to the GND node, and the fifth transistor Q is connected to the ND node. n5 The collector is connected to the seventh node a7.

2. The broadband linear power supply configurable output current limiting protection circuit according to claim 1, characterized in that, The sampling circuit includes a fourth resistor R4 and a second transistor Q. n2 The second node a2, the third node a3, and the external configuration resistor R5; One end of the fourth resistor R4 is connected to node a1, the output terminal of the voltage regulator's buffer, and the other end of the fourth resistor R4 is connected to node a3; the second transistor Q n2 The base of the transistor is connected to the third node a3, and the second transistor Q is connected to the third node a3. n2 The collector is connected to the power supply node V of the voltage regulator. CNTL The second transistor Q n2 The emitter is connected to the second node a2; one end of the external configuration resistor R5 is connected to the second node a2, and the other end of the external configuration resistor R5 is grounded.

3. The broadband linear power supply configurable output current limiting protection circuit according to claim 2, characterized in that, The voltage across the external configuration resistor R5 is related to the voltage across the second transistor Q. n2 The current is directly proportional to the current.

4. The broadband linear power supply configurable output current limiting protection circuit according to claim 1, characterized in that, The voltage regulator operates normally when it is unloaded or lightly loaded.

5. The broadband linear power supply configurable output current limiting protection circuit according to claim 1, characterized in that, When the voltage regulator is under heavy load, the current of the voltage regulator is limited.

6. The broadband linear power supply configurable output current limiting protection circuit according to claim 1, characterized in that, When the voltage regulator is in a short-circuit state to ground, the voltage regulator stops working.

7. The broadband linear power supply configurable output current limiting protection circuit according to claim 1, characterized in that, Input power V CNTL The voltage is 3V to 16V.

8. A current limiting method using a broadband linear power supply configurable output current limiting protection circuit as described in any one of claims 1 to 7, characterized in that, Includes the following steps: The data from the output of the voltage regulator's buffer and the power supply of the voltage regulator are transmitted to the sampling circuit to obtain the current of the voltage regulator. The data from the output node of the voltage regulator and the current of the voltage regulator are input to the signal processing circuit to control the current at the output terminal of the voltage regulator.

9. A voltage regulator, characterized in that, The broadband linear power supply described in any one of claims 1 to 7 can be configured with an output current limiting protection circuit.

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