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开关电源的软启动控制器

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This technical brief describes a microcontroller based
Soft-Start Controller circuit for a switching power supply.
Start-up is a stressful time for the power driver section of
a switching power supply. Because the output voltage is
initially zero, the feedback error initially jumps to its maxi-
mum. The large feedback error then drives the loop filter
to its limit, which drives the power switching transistors in
the driver section of the power supply at their maximum
rating. This condition continues until the output voltage of
the power supply approaches its nominal value.
If the load being driven by the power supply is capacitive,
the problem is exaggerated due to the large transient
currents required to charge the capacitive load. In
extreme instances, the repeated high stress of start-up
can result in catastrophic failures in the driver section,
typically, the power MOSFET transistors or the power
rectifiers.
TB081
Soft-Start Controller For Switching Power Supplies

Authors: John Day IMPLEMENTATION
Keith Curtis
Microchip Technology Inc. Hardware

OVERVIEW The hardware for the soft-start circuit consists of three
components; a PIC10F200 microcontroller, a 0.1 uF
This technical brief describes a microcontroller based capacitor and a 10 k pull-down resistor. The ramping
Soft-Start Controller circuit for a switching power supply. PWM function is implemented e……
开关电源的软启动控制器
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