HV311 데이터 시트보기 (PDF) - Supertex Inc

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HV311

Hot Swap Controller (Negative Supply Rail)

Supertex Inc 

GND

R1

487kW

R2

6.81kW

R3

9.76kW

-48V

8

VDD

3 UV

2 OV

1

PWRGD

HV311

RAMP VEE SENSE GATE

7

4

5

6

C1

10nF

R4

12.5mW

Q1

IRF530

Optocoupler

Rload

ENABLE

+5V

Cload

DC/DC

PWM

COM

CONVERTER

HV301/HV311

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

oscillations around are observed when VIN is close to OVLO.

Application Circuit 3

When the details of the load ENABLE circuitry is not known,

using an optocoupler always provides a safe solution (Application

Circuit 4).

Filtering Voltage Spikes on Input Supply

In some systems over voltage spikes of very short duration may

exist. For these systems a small capacitor may be added from

the OV pin to the VEE pin to filter the voltage spikes (Application

Circuit 5).

Optocoupler

GND

R1

487kW

R2

6.81kW

R3

9.76kW

-48V

8

VDD

3 UV

2 OV

1

PWRGD / PWRGD

HV311

RAMP VEE SENSE GATE

7

4

5

6

C1

10nF

R4

60mW

Q1

IRF530

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

oscillations around are observed when VIN is close to OVLO.

11

ENABLE / ENABLE +5V

Cload

DC/DC

PWM

COM

CONVERTER

Application Circuit 4

A092605

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