ML4831CP datasheet(2/14 Pages) MICRO-LINEAR

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ML4831

PIN CONFIGURATION

PIN# NAME

FUNCTION

PIN# NAME

FUNCTION

EA OUT

PFC Error Amplifier output and

compensation node

IA OUT

Output and compensation node of the

PFC average current transconductance

amplifier.

I(SINE)

PFC gain modulator input.

IA+

Non-inverting input of the PFC

average current transconductance

amplifier and peak current sense point

of the PFC cycle by cycle current limit

comparator.

LAMP F.B.

Inverting input of an Error Amplifier

used to sense (and regulate) lamp arc

current. Also the input node for

dimming control.

LFB OUT

Output from the Lamp Current Error

Transconductance Amplifier used for

lamp current loop compensation

R(SET)

External resistor which sets oscillator

FMAX, and R(X)/C(X) charging current

PIN DESCRIPTION

R(T)C(T)

Oscillator timing components

INTERRUPT Input used for lamp-out detection and

restart. A voltage greater than 7.5 volts

resets the chip and causes a restart

after a programmable interval.

10 R(X)/C(X)

Sets the timing for the preheat,

dimming lockout, and interrupt

11 GND

Ground

12 P GND

Power ground for the IC

13 OUT B

Ballast MOSFET drive output

14 OUT A

Ballast MOSFET drive output

15 PFC OUT

Power Factor MOSFET drive output

16 VCC

Positive Supply for the IC

17 VREF

Buffered output for the 7.5V voltage

reference

18 EA–/OVP

Inverting input to PFC error amplifier

and OVP comparator input

ML4831

18-Pin DIP (P18)

EA OUT

IA OUT

I(SINE)

IA+

LAMP F.B.

LFB OUT

R(SET)

R(T)/C(T)

INTERRUPT

EA–/OVP

VREF

VCC

PFC OUT

OUT A

OUT B

P GND

GND

R(X)/C(X)

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