ML4831
PIN CONFIGURATION
ML4831
18-Pin DIP (P18)
EA OUT
IA OUT
1
2
3
4
5
6
7
8
9
18
17
16
15
14
13
12
11
10
EA–/OVP
V
REF
I(SINE)
VCC
IA+
PFC OUT
OUT A
OUT B
P GND
GND
LAMP F.B.
LFB OUT
R(SET)
R(T)/C(T)
INTERRUPT
R(X)/C(X)
TOP VIEW
PIN DESCRIPTION
PIN# NAME
FUNCTION
PIN# NAME
FUNCTION
8
9
R(T)C(T)
Oscillator timing components
1
EA OUT
PFC Error Amplifier output and
compensation node
INTERRUPT Input used for lamp-out detection and
restart. A voltage greater than 7.5 volts
resets the chip and causes a restart
2
IA OUT
Output and compensation node of the
PFC average current transconductance
amplifier.
after a programmable interval.
10 R(X)/C(X)
Sets the timing for the preheat,
dimming lockout, and interrupt
3
4
I(SINE)
IA+
PFC gain modulator input.
Non-inverting input of the PFC
average current transconductance
amplifier and peak current sense point
of the PFC cycle by cycle current limit
comparator.
11 GND
Ground
12 P GND
13 OUT B
14 OUT A
15 PFC OUT
16 VCC
Power ground for the IC
Ballast MOSFET drive output
Ballast MOSFET drive output
Power Factor MOSFET drive output
Positive Supply for the IC
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
7
LFB OUT
Output from the Lamp Current Error
Transconductance Amplifier used for
lamp current loop compensation
17 V
Buffered output for the 7.5V voltage
reference
REF
18 EA–/OVP
Inverting input to PFC error amplifier
and OVP comparator input
R(SET)
External resistor which sets oscillator
F
, and R(X)/C(X) charging current
MAX
2
MICRO-LINEAR [ MICRO LINEAR CORPORATION ]
