IR51H420 Datasheet, PDF (4/6 Pages) International Rectifier – SELF-OSCILLATING HALF-BRIDGE

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IR51H420
Functional Block Diagram
1
VCC
2
RT
3
CT
Index
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VB
6
IR2151
VIN
9
IRFC420
7
VO
IRFC420
4
COM
Lead Definitions
Symbol
Lead
Description
VCC
Logic and internal gate drive supply voltage. An internal zener clamp diode at 15.6 V nominal is
included to allow the Vcc to be current fed directly from VIN typically by means of a high value
resistor.
RT
Oscillator timing resistor input; a resistor is connected from RT to CT. RT is out of phase with
the half-bridge output (VO).
CT
Oscillator timing capacitor output; 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
VB
VIN
VO
COM
where 75Ω is the effective impedance 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.
High voltage supply.
Half-bridge output.
Logic and low side of half-bridge return.
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