HV311 Ver la hoja de datos (PDF) - Supertex Inc

Número de pieza

componentes Descripción

Fabricante

HV311

Hot Swap Controller (Negative Supply Rail)

Supertex Inc 

Use with Negative Ground

The HV301 and HV311 may be used with many positive ground

systems where DC/DC PWM Converters have isolated outputs

and their inputs need not be ground referenced (Application

Circuit 14).

HV301/HV311

Current Limit Stability (Method 2 (Servo) Only)

The closed loop current mode control system used in the HV301/

HV311 is very stable, especially when driving MOSFETs with

high gate capacitances (CISS). However, a peaking in ILIMIT near

the end of the current limit may be noted with some MOSFETs.

The current control loop can be frequency compensated to

eliminate this peaking by adding a series connected capacitor

and resistor between the gate and source of the external MOSFET.

The recommended starting values for C and R are 10nF and 1K.

These compensation values should be verified by board level

testing, which may yield satisfactory results with reduced com-

ponent values.

+48V

R1

487kΩ

R2

6.81kΩ

R3

9.76kΩ

8

VDD

3

UV

2

OV

PWRGD / PWRGD 1

HV301/

HV311

ENABLE/ ENABLE

Cload

DC/DC PWM CONVERTER

RAMP VEE SENSE GATE

7

4

5

6

GND

C1

10nF

R4

12.5mΩ

Q1

IRF530

+5V

COM

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

oscillations around are observed when VIN is close to OVLO.

Application Circuit 14

A092605

17

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