HV311LG データシートの表示（PDF） - Supertex Inc

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HV311LG

35-65V hotswap, controller with circuit breaker

Supertex Inc 

Application Information, cont’d.

Reverse Polarity Protection

The UV and OV pins are protected against reverse polarity input

supplies by internal clamping diodes and the fault currents are

sufficiently limited by the impedance of the external resistor

divider, however, a low current diode with a 100V breakdown

rating must be inserted in series with the VDD pin.

HV301/HV311

This method (shown in Application Circuit 12) will protect the

hotswap control circuit however, due to the intrinsic diode in the

external MOSFET, the load will not be protected from reverse

polarity voltages.

GND

R1

487kΩ

R2

6.81kΩ

R3

9.76kΩ

-48V

D1

8

VDD

3 UV

2 OV

PWRGD / PWRGD 1

HV311

ENABLE / ENABLE +5V

Cload

DC/DC

PWM

COM

CONVERTER

RAMP VEE SENSE GATE

7

4

5

6

C1

10nF

R4

12.5mΩ

Q1

IRF530

Note: capacitor may be needed to slow PWRGD dv/dt if

oscillations are observed when VIN is close to OV.

Application Circuit 12

16

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