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IRPLDIM1U

IR21592 Dimming Ballast Control IC Design Kit

International Rectifier 

Power Factor Correction

The power factor correction section consists of the L6561D Power Factor Controller IC (IC1), MOSFET

M1, inductor L2, diode D2, capacitor C8 and additional biasing, sensing and compensation compo-

nents (see schematic diagram). This is a boost topology designed to step-up and regulate the output

DC bus voltage while drawing sinusoidal current from the line (low THD) which is “in phase” with the

AC input line voltage (HPF). The design of the power factor correction section was taken from the

L6561D data sheet and information on the operation and design considerations for the L6561D are

contained therein.

Ballast Control

The ballast control section is built around the IR21592 Ballast Control IC, IC2 of the Demo board.

The IR21592 contains an oscillator, a high voltage half-bridge gate driver, an analog dimming inter-

face and lamp fault protection circuitry. A block diagram of the IR21592 IC is shown in figure 1 and a

state diagram of the IR21592 is shown in figure 2.

VCC

60uA

VCO 2

RFB

ICT

V

15uA

1uA

VDC 1

CPH 3

10V

1.3uA

REF

DIM 4

MAX 5

5.1V

SQ

RQ

IDIM

FB

MIN 6

4/RFMIN

0.1/R FMIN

IDIM/5

0.1/R FMIN

3V

FMIN 7

IFMIN

5.1V

1/RFMIN

IPH 8

1.6V 1 5.1V

0

SQ

RQ

CT

ICT

IDT +

I CT

5.1V

1.0V

CT

ERR

SQ

R1

R2 Q

LEVEL

SHIFT

PULSE

FILTER &

LATCH

14 VB

16 HO

15 VS

TQ

RQ

400ns

DELAY

15.6V

13 VCC

11 LO

12 COM

SQ

RQ

IGN

DET

UNDER-

VOLTAGE

DETECT

QS

QR

OVER-

TEMP

DETECT

10 CS

9 SD

2.0V 7.6V

Figure 1: IR21592 Block Diagram

www.irf.com

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