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.

However, if the DC/DC PWM Converter with the ENABLE input

circuit configuration was active HIGH, then the apparent choice

of the HV301 would result in the creation of a current path

through the protective diode clamp of the ENABLE input and the

PWRGD output MOSFET of the HV301. For this situation the

HV311 should be used as shown below in Application Circuit 2.

HV301/HV311

In some applications the PWRGD signal is used to activate load

circuitry on the isolated output side of the DC/DC PWM Con-

verter. In this situation an optocoupler is needed to provide the

required isolation as shown below in Application Circuit 3.

GND

R1

487kΩ

R2

6.81kΩ

R3

9.76kΩ

-48V

8

VDD

PWRGD

1

3 UV

2 OV

HV311

RAMP VEE

7

4

C1

10nF

SENSE GATE

5

6

R4

12.5mΩ

Q1

IRF530

+

Cload

-

ENABLE

+5V

DC/DC

PWM

CONVERTER

COM

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

oscillations are observed when VIN is close to OV.

Application Circuit 2

GND

R1

487kΩ

R2

6.81kΩ

R3

9.76kΩ

-48V

8

VDD

3 UV

2 OV

1

PWRGD

HV311

RAMP VEE SENSE GATE

7

4

5

6

C1

10nF

R4

12.5mΩ

Q1

IRF530

Optocoupler

Rload

ENABLE

+5V

Cload

DC/DC

PWM

COM

CONVERTER

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

oscillations are observed when VIN is close to OV.

11

Application Circuit 3

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