HV311LG 데이터 시트보기 (PDF) - Supertex Inc

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HV311LG

Hot Swap Controller (Negative Supply Rail)

Supertex Inc 

Long

Pin

GND

R1

487kΩ

R2

6.81kΩ

R3

9.76kΩ

-48V

Short

Pin

-48V

Long

Pin

HV301/HV311

8

VDD

3 UV

2 OV

PWRGD / PWRGD 1

HV311

ENABLE / ENABLE +5V

Cload

DC/DC

PWM

COM

CONVERTER

RAMP VEE

7

4

6.2V

C1

10nF

SENSE GATE

56

R4

12.5mΩ

Q1

IRF530

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

oscillations around are observed when VIN is close to OVLO.

Application Circuit 9

If a system requires the use of a short connector pin on the

negative supply lead to guarantee that the power pins are fully

mated before the hot swap control circuit is enabled and uses

separate resistor dividers for UV and OV, then a 6.2V to 10V

zener diode must be connected from the OV pin to the VEE pin and

only the OV divider should be connected to the short pin

(Application Circuit 10).

Increasing Under Voltage Hysteresis

If the internally fixed under voltage hysteresis is insufficient for a

particular system application, then it may be increased by using

separate resistor dividers for OV and UV and providing a resistor

feedback path from the GATE pin to the UV pin (Application

Circuit 11).

Long

Pin

GND

R1

475kΩ

R2

16.2kΩ

-48V

Short

Pin

-48V

Long

Pin

8

VDD

PWRGD / PWRGD 1

R3

511kΩ

R4

10kΩ

3 UV

2 OV

HV301/

HV311

RAMP VEE

7

4

SENSE GATE

5

6

6.2V

C1

10nF

ENABLE / ENABLE +5V

Cload

DC/DC

PWM

COM

CONVERTER

R5

12.5mΩ

Q1

IRF530

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

oscillations around are observed when VIN is close to OVLO.

Application Circuit 10

A092605

14

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