ML4835 データシートの表示（PDF） - Micro Linear Corporation

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ML4835

Compact Fluorescent Electronic Dimming Ballast Controller

Micro Linear Corporation 

ML4835

PIN CONFIGURATION

ML4835

20-Pin SOIC (S20)

20-Pin DIP (P20)

PVFB/OVP

1

PEAO

2

PIFB

3

PIFBO

4

LAMP FB

5

LEAO

6

RSET

7

RT2

8

RT/CT

9

INTERRUPT

10

20

REF

19

VCC

18

PFC OUT

17

OUT A

16

OUT B

15

PGND

14

AGND

13

CRAMP

12

PWDET

11

RX/CX

PIN DESCRIPTION

PIN NAME

FUNCTION

1 PVFB/OVP Inverting input to the PFC error

amplifier and OVP comparator input.

2 PEAO

PFC error amplifier output and

compensation node

3 PIFB

Senses the inductor current and peak

current sense point of the PFC cycle

by cycle current limit

4 PIFBO

Output of the current sense amplifier.

Placing a capacitor to ground will

average the inductor current.

5 LAMP FB Inverting input of the lamp error

amplifier, used to sense and regulate

lamp arc current. Also the input node

for dimmable control.

6 LEAO

Output of the lamp current error

transconductance amplifier used for

lamp current loop compensation

7 RSET

8 RT2

External resistor which SETS oscillator

FMAX, and RX/CX charging current

Oscillator timing component to set

start frequency

9 RT/CT

Oscillator timing components

PIN NAME

FUNCTION

10 INTERRUPT Input used for lamp-out detection and

restart. A voltage less than 1V will

reset the IC and cause a restart after a

programmable interval.

11 RX/CX

Sets the timing for preheat and

interrupt.

12 PWDET Lamp output power detection

13 CRAMP

Integrated voltage of the error

amplifier out

14 AGND

Analog ground

15 PGND

Power ground.

16 OUT B

Ballast MOSFET driver output

17 OUT A

Ballast MOSFET driver output

18 PFC OUT Power factor MOSFET driver output

19 VCC

20 REF

Positive supply voltage

Buffered output for the 7.5V reference

2

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