ML4833 데이터 시트보기 (PDF) - Micro Linear Corporation

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ML4833

Electronic Dimming Ballast Controller

Micro Linear Corporation 

ML4833

PIN CONFIGURATION

ML4833

18-Pin DIP (P18)

PEAO

PIFB

PDWN

LAMP FB

LFB OUT

RSET

RT/CT

INTERRUPT

RX/CX

1

18

2

17

3

16

4

15

5

14

6

13

7

12

8

11

9

10

TOP VIEW

PVFB/OVP

VREF

VCC

PFC OUT

OUT A

OUT B

P GND

GND

CRAMP

PEAO

PIFB

PDWN

LAMP FB

LFB OUT

RSET

RT/CT

INTERRUPT

RX/CX

ML4833

18-Pin SOIC (S18)

1

18

2

17

3

16

4

15

5

14

6

13

7

12

8

11

9

10

TOP VIEW

PVFB/OVP

VREF

VCC

PFC OUT

OUT A

OUT B

P GND

GND

CRAMP

PIN DESCRIPTION

PIN# NAME

FUNCTION

1 PEAO

2 PIFB

3 PDWN

4 LAMP FB

5 LFB OUT

6 RSET

7 RT/CT

PFC error amplifier output and

compensation node.

Sensing of the inductor current and

peak current sense point of the PFC

cycle by cycle current limit

comparator.

A one volt comparator threshold that

switches the operating frequency to

the preheat frequency when exceeded.

Inverting input of an error amplifier

used to sense (and regulate) lamp arc

current. Also the input node for

dimming control.

Output of the lamp current error

transconductance amplifier used for

lamp current loop compensation.

External resistor which sets oscillator

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

Oscillator timing components.

PIN# NAME

FUNCTION

8 INTERRUPT Input used for lamp-out detection and

restart. A voltage less than 1.25 volts

resets the chip and causes a restart

after a programmable interval.

9 RX/CX

Sets the timing for the preheat,

dimming lockout, and interrupt.

10 CRAMP

Integrated voltage of the error

amp out.

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 PVFB/OVP Inverting input to PFC error amplifier

and OVP comparator input.

2

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