IR21571 datasheet(7/17 Pages) IRF

7 / 17 page

IR21571(S)

www.irf.com

UVLO Mode

2-Bridge Off

QCC ≅ 150µA

CPH = 0V

Oscillator Off

PREHEAT Mode

2-Bridge @ f

CPH Charging @ I

PH = 1µA

RPH = 0V

RUN = Open Circuit

CS Disabled

IGNITION RAMP Mode

PH ramps to f

MIN

CPH Charging @ I

PH = 1µA

RPH = Open Circuit

RUN = Open Circuit

CS+ Threshold Enabled

RUN Mode

MIN Ramps to f

RUN

CPH Charges to 7.6V Clamp

RPH = Open Circuit

RUN = 0V

CS- Threshold Enabled

VCC > 11.4V(UV+)

and

VDC > 5.1V(Bus OK)

and

SD < 1.7V(Lamp OK)

and

J < 160C (Tjmax)

CPH > 4.0V

(End of PREHEAT Mode)

CPH > 5.1V

(End of IGNITION RAMP)

VCC < 9.5V

(VCC Fault or Power Down)

VDC < 3.0V

(dc Bus/ac Line Fault or Power Down)

SD > 2.0V

(Lamp Fault or Lamp Removal)

Power Turned On

FAULT Mode

Fault Latch Set

2-Bridge Off

QCC ≅ 150µA

CPH = 0V

VCC = 15.6V

Oscillator Off

J > 160C

(Over-Temperature)

CS > CS+ Threshold

(Failure to Strike Lamp

or Hard Switching)

J > 160C

(Over-Temperature)

CS > CS+ Threshold

(Over-Current or Hard Switching)

CS < 0.2V

(No-Load or Below Resonance)

J > 160C

(Over-Temperature)

SD > 2.0V

(Lamp Removal)

VCC < 9.5V

(Power Turned Off)

IR21571 State Diagram

IR21571 Datasheet(PDF) 7 Page - International Rectifier

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