A high voltage LDO linear power supply realized by low voltage mosfet
A linear power supply, high-voltage technology, applied in electrical components, regulating electrical variables, output power conversion devices, etc., can solve the problems of low voltage withstand voltage of digital MOSFET, can not provide high-voltage LDO linear power supply, etc., to avoid circuit system Effects of damage, wide application range, high power supply rejection ratio
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[0041] combined with figure 1 As shown, a high-voltage resistant LDO linear power supply implemented by low-voltage MOSFETs includes a power supply voltage conversion module, a low-voltage multi-stage gain improvement module 2, a high-voltage driving module 3, a power supply module 4 and a voltage clamping module 5, wherein:
[0042] The power supply voltage conversion module is used to convert the external power supply voltage into an output voltage lower than the withstand voltage limit of the MOSFET to provide the working voltage for the low-voltage multi-stage gain improvement module 2, and output the intermediate level as the control voltage of the power supply module 4;
[0043] The low-voltage multi-stage gain improvement module 2 is used to output the high-gain voltage to the high-voltage driving module 3 and receive the feedback signal of the voltage clamping module 5;
[0044] The high-voltage drive module 3 is provided with an external power supply voltage to conver...
Embodiment 2
[0051] On the basis of Example 1, in conjunction with the attached figure 2 As shown, the power supply voltage conversion module includes a MOS transistor M1, a MOS transistor M2, a MOS transistor M3, and a MOS transistor M4. The drain of the MOS transistor M1 is connected to an external power supply after the drain of the MOS transistor M1 is connected in series with a resistor R2 and a resistor R1, and the resistor R2 is connected in parallel with a plurality of diodes ( Diodes D1-D6), the gate of MOS transistor M1 is connected to the gate of MOS transistor M4 after being connected to the gate of MOS transistor M4 in series with resistor R5; the first output voltage control circuit for adjusting the output voltage is connected between the source of MOS transistor M1 and the ground; the MOS transistor The drain of M2 is connected to an external power supply after connecting resistor R4 and resistor R3 in series, resistor R4 is connected in parallel with diode D14, diode D11, ...
Embodiment 3
[0057] On the basis of embodiment 1 or 2, in conjunction with the attached image 3As shown, the low-voltage multi-stage gain improvement module 2 adopts an enhanced operational amplifier module, and uses a differential output to provide high gain. The low-voltage multi-stage gain improvement module 2 includes MOS transistors M8, MOS transistors M9, MOS transistors M13, MOS transistors M17, and MOS transistors M21 whose sources are connected to the power supply voltage conversion module and which are connected to the common gate; the drain of the MOS transistor M8 The source of the MOS transistor M7 is connected; the drain of the MOS transistor M9 is connected to the source of the MOS transistor M10; the drain of the MOS transistor M13 is connected to the source of the MOS transistor M14; the drain of the MOS transistor M17 is connected to the source of the MOS transistor M18; The drain of MOS transistor M21 is connected to the source of MOS transistor M22; the common gate of ...
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