Voltage reduction module

Abstract

The utility model relates to the technical field of step-down modules, and discloses a step-down module, which comprises an input voltage VIN, an internal control circuit analog ground AGND, a feedback pin FB, an on / off control pin EN and a power supply output pin OUT, and is characterized in that the input voltage VIN is filtered through a capacitor C1 and is connected with the on / off control pin EN for control; an input voltage VIN, an output voltage of 2.75 V and a current of 6 V are enabled to be directly connected to a load through a power supply output pin OUT in the module, filtering is carried out through an electrolytic capacitor C2, an output voltage VOUT is enabled to be output to a feed pin (FB) to be connected with the output voltage VOUT through a resistance voltage divider, a feedback network is realized, a power supply outputs a voltage 1.2 and a current 3A, and a voltage reduction effect is realized. And meanwhile, the voltage OUT is fed back to a PWM controller in the module, and the power supply output voltage OUT is fed back to the PWM controller in the module to ensure the precision of the output voltage.

Description

Technical Field

[0001] The utility model relates to the technical field of step-down modules, and more specifically, to a step-down module. Background Art

[0002] A step-down (Buck) module is a power management device, also known as a buck converter. Its basic principle is to convert high voltage to low voltage to meet the power requirements of various circuits. A Buck module can reduce a wide range of input voltages to a fixed output voltage while ensuring stable output current and relatively high efficiency. Therefore, I propose a Buck module. Utility Model Content

[0003] In order to solve the problems raised in the above background technology, the present invention provides a step-down module.

[0004] The utility model provides a step-down module adopting the following technical solutions:

[0005] A step-down module includes: an input voltage VIN, an internal control circuit analog ground AGND, a feedback pin FB, an on / off control pin EN, a power output pin OUT, a power normal output indication pin PG, an IN pin for supplying power to the internal control circuit, and a PGND power ground;

[0006] The input voltage VIN is filtered through capacitor C1 and connected to the on / off control pin EN. The power output pin OUT is directly connected to the load and filtered through electrolytic capacitor C2. The feed pin FB is connected to the output voltage VOUT through a resistor divider. The enable pin EN is connected to ground GND, the analog ground AGND and the power ground PGND are connected to ground, and the output of the power normal output indication pin PG is an open drain and is connected to the IN pin through an internal pull-up resistor.

[0007] Preferably, an output voltage sampling pin OUT_S is also included.

[0008] Preferably, it further includes a switch output pin SW, wherein the switch output pin SW is connected to the power MOSFET, and the switch output pin SW is connected to a driver in the module.

[0009] Preferably, it further includes a suspended NC pin, which may be connected to GND.

[0010] Preferably, the feedback pin FB is connected to a voltage regulator LDO in the module.

[0011] Preferably, the resistor divider includes a resistor R1 and a resistor R2.

[0012] In summary, the present invention has the following beneficial technical effects:

[0013] The utility model filters the input voltage VIN through the capacitor C1 and connects it to the on / off control pin EN for control, so that the input voltage VIN outputs a voltage of 2.75V and a current of 6V, and then directly connects it to the load through the power output pin OUT in the module, and filters it through the electrolytic capacitor C2, so that the output voltage VOUT is output. The feedback pin FB is connected to the output voltage VOUT through a resistor divider, realizing a feedback network, and reducing the power output voltage to 1.2A and the current to 3A, achieving a voltage reduction effect. At the same time, the voltage OUT is fed back to the PWM controller in the module, and the power output voltage OUT is fed back to the PWM controller in the module to ensure the accuracy of the output voltage. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of an application circuit in an embodiment of the present utility model;

[0015] Figure 2 1 is a schematic diagram of a test circuit in an embodiment of the present utility model;

[0016] Figure 3 Schematic diagram of the feedback circuit structure in the embodiment of the present utility model;

[0017] Figure 4 It is a schematic diagram of the functional block diagram structure in an embodiment of the present utility model. DETAILED DESCRIPTION

[0018] The following is combined with Figure 1-4 The utility model is described in further detail.

[0019] It should be noted that the drawings are schematic and not drawn to scale. For clarity and convenience, the relative sizes and proportions of parts shown in the drawings may be exaggerated or reduced in size. Any dimensions are illustrative only and are not intended to be limiting. Identical structures, elements, or components appearing in two or more drawings are denoted by the same reference numerals to indicate similar features.

[0020] The embodiment of the utility model discloses a step-down module. Figure 1-4 A step-down module, characterized by comprising: an input voltage VIN, an internal control circuit analog ground AGND, a feedback pin FB, an on / off control pin EN, a power output pin OUT, a power normal output indication pin PG, an IN pin for supplying power to the internal control circuit, and a PGND power ground;

[0021] Reference Figure 1The input voltage VIN is filtered by the capacitor C1 and connected to the on / off control pin EN, and the power output pin OUT is directly connected to the load and filtered by the electrolytic capacitor C2;

[0022] Reference Figure 3 The feedback pin FB is connected to the output voltage VOUT through a resistor divider, realizing a feedback network to feed back the power supply output voltage OUT to the PWM controller in the module. The feedback pin FB is connected to the voltage regulator LDO in the module. The enable pin EN is connected to the ground GND, the analog ground AGND and the power ground PGND are connected to the ground, and the output of the power normal output indication pin PG is an open drain and is connected to the IN pin through an internal pull-up resistor;

[0023] Output voltage sampling pin OUT_S;

[0024] A switch output pin SW, wherein the switch output pin SW is connected to a power MOSFET, and the switch output pin SW is connected to a driver in the module;

[0025] Also included is a floating NC pin, wherein the floating NC pin may be connected to GND;

[0026] The resistor divider includes a resistor R1 and a resistor R2;

[0027] The module is tested under the condition of V IN =3.6V,T J = -55℃ to +125℃, the typical test conditions are TJ = +25℃ and the results are as follows:

[0028]

[0029]

[0030]

[0031]

[0032] Specifically, the input voltage VIN is filtered through the capacitor C1 and connected to the on / off control pin EN for control, so that the input voltage VIN output voltage 2.75V and current 6V, and then directly connected to the load through the power output pin OUT in the module, and filtered through the electrolytic capacitor C2, so that the output voltage VOUT is output. The feed pin (FB) is connected to the output voltage VOUT through a resistor divider to realize the feedback network, and the power output voltage 1.2A and current 3A are achieved, achieving the effect of voltage reduction. At the same time, the voltage OUT is fed back to the PWM controller in the module, and the power output voltage OUT is fed back to the PWM controller in the module to ensure the accuracy of the output voltage.

[0033] Finally, a few points should be explained: First, in the description of the present invention, it should be noted that, unless otherwise specified or limited, the terms "mounted", "connected", and "connected" should be understood in a broad sense, and may refer to mechanical or electrical connections, internal communication between two components, or direct connection. "upper", "lower", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may change.

[0034] Secondly: The drawings of the embodiments disclosed in this utility model only involve structures related to the embodiments disclosed in this utility model. Other structures can refer to common designs. In the absence of conflicts, the same embodiment and different embodiments of the utility model can be combined with each other.

[0035] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A step-down module, characterized in that: include: Input voltage VIN, internal control circuit analog ground AGND, feedback pin FB, on / off control pin EN, power output pin OUT, power normal output indication pin PG, IN pin supplies power to the internal control circuit, PGND power ground; The input voltage VIN is filtered through capacitor C1 and connected to the on / off control pin EN. The power output pin OUT is directly connected to the load and filtered through electrolytic capacitor C2. The feed pin FB is connected to the output voltage VOUT through a resistor divider, the enable pin EN is connected to the ground GND, the analog ground AGND and the power ground P-GND are connected to the ground, and the output of the power normal output indication pin PG is an open drain and is connected to the IN pin through an internal pull-up resistor.

2. A step-down module according to claim 1, characterized in that: It also includes an output voltage sampling pin OUT_S.

3. The step-down module according to claim 1, wherein: The module further includes a switch output pin SW, wherein the switch output pin SW is connected to a power MOSFET, and the switch output pin SW is connected to a driver in the module.

4. The step-down module according to claim 1, wherein: A floating NC pin is also included, and the floating NC pin may be connected to GND.

5. The step-down module according to claim 1, characterized in that: The feedback pin FB is connected to a voltage regulator LDO in the module.

6. The step-down module according to claim 1, characterized in that: The resistor divider includes a resistor R1 and a resistor R2.

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