HR2000 — FLUORESCENT LAMP HB DRIVER WITH PFC

HR2000 Rev. 1.0

www.MonolithicPower.com

12

2/20/2013

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PIN FUNCTIONS

Pin #

Name

Description

1

VO

PFC output control pin. Connect a resistor from this pin to the PFC output to set the PFC

output voltage. Connect a capacitor (or a R-C-C network) from this pin to GND for the

compensation of the PFC regulation loop.

2

ZCD

PFC inductor zero current detection pin.

3

OVC

PFC over voltage/current protection pin.

4

CT

Frequency setting capacitor pin. Connect a capacitor from this pin to GND to set the

frequency.

5

FC

Frequency control pin. It is voltage controlled oscillator (VCO) pin for controlling half bridge

frequency.

6

CP/EOL

Preheat/ignition timing pin and EOL detector. A capacitor from this pin to GND sets the

preheat time and ignition time. Before half-bridge works, it is discharged internally to GND. In

the preheat state and ignition state, a triangle waveform is generated on this pin and used as

a timer.

The voltage of the blocking capacitor is sensed to this pin to indicate the EOL condition.

After preheat and ignition state, the voltage at this pin is internally discharged to the middle

of the EOL window comparator’s reference, and then the lamp’s EOL information is under

monitoring. If EOL condition is confirmed, an internal current source charges the Pre/FT

pin’s capacitor.

7

REF

Internal reference current setting resistor pin. Connect a resistor from this pin to GND to set

the frequency.

8

Pre/FT

In the preheat state, this pin outputs a high level voltage to drive the external preheating

MOSFET. After this period, it is discharged to Vfault (reset2). Then it is used as a fault timer

to stop IC at fault condition. At fault condition, an internal current source charges up this pin,

and when its voltage hits the fault reference threshold, IC latches up.

Connect a capacitor on this pin to set the fault timer.

9

BST

Bootstrap voltage supply for half bridge level shifter. Connect a capacitor (usually 10nF to

100nF) between this pin and SW pin.

10

UG

Half bridge up side MOSFET driver.

11

SW

Half bridge floating middle point.

12

CS

Half bridge current sensor.

13

LG

Half bridge low side MOSFET driver.

14

VCC

Supply voltage of the IC.

15

GND

Ground

16

GATE

PFC GATE driver pin.