IR51H320 Просмотр технического описания (PDF) - International Rectifier

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IR51H320

SELF-OSCILLATING HALF BRIDGE

International Rectifier 

IR51H(D)224

IR51H(D)320

IR51H(D)420

Functional Block Diagram

VB

D1

6

1

Vcc

2

RT

3

CT

HO

IR2151

VS

LO

Fast recovery diode D1 is

incorporated in IR51HDXXX only

VIN

9

IRFCXXX

7

VO

IRFCXXX

4

COM

Lead Definitions

Symbol

VCC

RT

CT

VB

VIN

VO

COM

Lead Description

Logic and internal gate drive supply voltage. An internal zener clamp diode at 15.6 V norminal is included

to allow the VCC to be current fed directly from VIN typically by means of a high value resistor.

Oscillator timing resistor output; a resistor is connected from RT to CT. RT is out of phase with the half-

bridge output (VO).

Oscillator timing capacitor input; a capacitor is connected from CT to COM in order to program the

oscillator frequency according to the following equation:

f=

1

1. 4 × (RT + 75Ω) × CT

CT PIN also invokes shutdown function (see note 2) where 75Ω is the effective impedence of the RT

output stage.

High side gate drive floating supply. For bootstrap operation a high voltage fast recovery diode is needed

to feed from VCC to VB. (HD type circuits incorporate this diode).

High voltage supply

Half Bridge output

Logic and low side of half bridge return

5

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