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Design method and circuit for realizing LDO function by discrete original element

A design method and functional technology, applied in the direction of output power conversion devices, electrical components, and adjustable electrical variables, can solve the problem of high cost and achieve the effect of reducing the cost of use

Inactive Publication Date: 2018-07-06
ZHENGZHOU YUNHAI INFORMATION TECH CO LTD
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0005] When the input voltage and output voltage are very close, and the current is not large, the existing technical solution uses the LDO voltage regulator to realize the power conversion, but the disadvantage is that the cost is relatively high

Method used

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  • Design method and circuit for realizing LDO function by discrete original element

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Embodiment Construction

[0021] According to the accompanying drawings of the description, the present invention is further described in conjunction with specific embodiments:

[0022] Such as figure 1 As shown, a circuit that realizes LDO function by discrete components, the circuit includes Q19 NPN transistor PZT2222A and voltage regulator D8 diode BZT52H, wherein the C pole of Q19 NPN transistor PZT2222A is connected to the voltage input terminal P12V (12V), and the C pole is connected to To the voltage output terminal, output the required voltage VOUT (VCC5_IR(5V)); one end of the D8 Zener diode BZT52H is grounded, and the other end is connected to the B pole of the Q19 NPN transistor PZT2222A, and the D8 Zener diode BZT52H stabilizes the voltage of the B pole of the Q19NPN transistor PZT2222A At the required voltage VOUT (VCC5_IR(5V)), let the Q19 NPN transistor PZT2222A work in the amplified state, so that the output voltage of the Q19 NPN transistor PZT2222A is stabilized at the required voltag...

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Abstract

The invention discloses a design method and circuit for realizing an LDO function by a discrete original element. According to the method, with an NPN transistor PZT2222A and a voltage-regulator diodeBZT52H and matched related circuits, P12V can be transformed into a needed voltage VOUT. Therefore, the use cost of the power supply scheme can be lowered. When the design method is implemented, thecircuit is added into a main board circuit pattern, corresponding devices are arranged in a PCBA, and an NPN transistor PZT2222A is arranged at a power supply usage terminal.

Description

technical field [0001] The invention relates to the technical field of data center resource management, in particular to a design method and a circuit for realizing LDO functions by discrete components. Background technique [0002] In the whole machine of a general-purpose server, the power supply voltage values ​​used are 12V, 5V, 3.3V, 2.5V, 1.2V, 0.6V, etc., and most of them are realized through the DC-DC conversion scheme. The advantages are high efficiency, high output current, and low quiescent current. With increased integration, many new DC-DC converters require only a few external inductors and filter capacitors. However, the output pulsation and switching noise of this type of power controller are large, and the cost is relatively high. If the input voltage is very close to the output voltage and the output current is not large, you can choose an LDO regulator to achieve high efficiency. [0003] LDO is a low dropout regulator, which is a low dropout linear reg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/156
CPCH02M3/156
Inventor 彭俊华
Owner ZHENGZHOU YUNHAI INFORMATION TECH CO LTD
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