HV311 データシートの表示（PDF） - Supertex Inc

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HV311

35-65V hotswap, controller with circuit breaker

Supertex Inc 

Application Information cont’d.

Extending Circuit Breaker Delay

Connecting a resistor in series with the SENSE pin and a

capacitor between the SENSE and VEE pins as shown in the

following diagram may be used to extend the Circuit Breaker

delay time beyond the 5µs internally set delay time (Application

Circuit 15).

The time delay achievable by this method is limited since this

HV301/HV311

delay circuit will also effect the current control feedback loop and

will result in a current overshoot during the external pass device

turn on transition to current limit. If the time delay required for the

Circuit Breaker causes excessive current overshoot during the

turn on transition then the following circuit may be used, where

the RC filter is switched on after the completion of the current

limit control function of the hotswap controller.

GND

R1

487kΩ

R2

6.81kΩ

R3

9.76kΩ

8

VDD

3 UV

2 OV

1

PWRGD / PWRGD

HV301/

HV311

ENABLE/ ENABLE +5V

Cload

DC/DC

PWM

COM

CONVERTER

RAMP VEE SENSE GATE

7

4

5

6

-48V

C2 R5

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 15

19

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