HV311 查看數據表（PDF） - Supertex Inc

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HV311

Hot Swap Controller (Negative Supply Rail)

Supertex Inc 

Redundant Supplies

Many systems use redundant primary power supplies or battery

backup. When redundant AC powered sources are used they

are generally diode OR’ed to the load on the hot terminal.

For these systems, the use of independent hot swap controllers

is recommended with the diode OR’ing provided after the hot

HV301/HV311

swap controllers. The HV311 is ideally suited for such applica-

tions since two or more active low PWRGD signals can be

connected to a single active low ENABLE pin, thus enabling the

load as long as at least one primary power source is available.

By adding low current 100V diodes in series with the VDD pins, full

reverse polarity protection on either power source is also pro-

vided (Application Circuit 13).

GND

R1

487kΩ

PS1

R2

6.81kΩ

R3

9.76kΩ

D2

8

VDD

3 UV

2 OV

PWRGD 1

HV301/

HV311

RAMP VEE SENSE GATE

7

4

5

6

-48V

C1

10nF

R4

60mΩ

D1

Q1

IRF530

GND

D2

8

VDD

R1

487kΩ

3 UV

R2

PS2 6.81kΩ

2 OV

R3

9.76kΩ

PWRGD 1

HV301/

HV311

RAMP VEE SENSE GATE

7

4

5

6

-48V

C1

10nF

R4

60mΩ

D1

Q1

IRF530

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

oscillations around are observed when VIN is close to OVLO.

ENABLE / ENABLE +5V

Cload

DC/DC

PWM

COM

CONVERTER

Application Circuit 13

A092605

16

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