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

Número de pieza

componentes Descripción

Fabricante

HV311

35-65V hotswap, controller with circuit breaker

Supertex Inc 

Application Information, cont’d.

Use with Negative Ground

Either the HV301 or HV311 may be used with any negative

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

oscillations are observed when VIN is close to OV.

Application Circuit 14

18

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