ML4831 Ver la hoja de datos (PDF) - Micro Linear Corporation

Número de pieza

componentes Descripción

Fabricante

ML4831

Electronic Ballast Controller

Micro Linear Corporation 

ML4831

PIN CONFIGURATION

ML4831

18-Pin DIP (P18)

EA OUT

IA OUT

I(SINE)

IA+

LAMP F.B.

LFB OUT

R(SET)

R(T)/C(T)

INTERRUPT

1

18

2

17

3

16

4

15

5

14

6

13

7

12

8

11

9

10

TOP VIEW

EA–/OVP

VREF

VCC

PFC OUT

OUT A

OUT B

P GND

GND

R(X)/C(X)

PIN DESCRIPTION

PIN# NAME

FUNCTION

1 EA OUT

PFC Error Amplifier output and

compensation node

2 IA OUT

Output and compensation node of the

PFC average current transconductance

amplifier.

3 I(SINE)

PFC gain modulator input.

4 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.

5 LAMP F.B. Inverting input of an Error Amplifier

used to sense (and regulate) lamp arc

current. Also the input node for

dimming control.

6 LFB OUT

Output from the Lamp Current Error

Transconductance Amplifier used for

lamp current loop compensation

7 R(SET)

External resistor which sets oscillator

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

PIN# NAME

FUNCTION

8 R(T)C(T) Oscillator timing components

9 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

2

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