ml4833 Microsemi Corporation, ml4833 Datasheet - Page 2

• Manufacturer Part Number: ml4833
• Description: Electronic Dimming Ballast Controller
• Manufacturer: Microsemi Corporation

ML4833
PIN CONFIGURATION
PIN DESCRIPTION
2
PIN# NAME
1
2
3
4
5
6
7
PEAO
PIFB
PDWN
LAMP FB
LFB OUT
R
R
SET
T
/C
INTERRUPT
T
LFB OUT
LAMP FB
PDWN
R
PEAO
R
X
PIFB
R
T
/C
/C
SET
T
X
FUNCTION
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
F
Oscillator timing components.
18-Pin DIP (P18)
MAX
1
2
3
4
5
6
7
8
9
TOP VIEW
, and R(X)/C(X) charging current.
ML4833
18
17
16
15
14
13
12
11
10
PVFB/OVP
V
VCC
PFC OUT
OUT A
OUT B
P GND
GND
C
REF
RAMP
PIN# NAME
10 C
12 P GND
13 OUT B
14 OUT A
15 PFC OUT
16 VCC
17 V
18 PVFB/OVP Inverting input to PFC error amplifier
11 GND
8
9
INTERRUPT
INTERRUPT Input used for lamp-out detection and
R
X
RAMP
REF
LFB OUT
LAMP FB
/C
PDWN
R
R
PEAO
X
X
PIFB
T
R
/C
/C
SET
X
T
FUNCTION
restart. A voltage less than 1.25 volts
resets the chip and causes a restart
after a programmable interval.
Sets the timing for the preheat,
dimming lockout, and interrupt.
Integrated voltage of the error
amp out.
Ground.
Power ground for the IC.
Ballast MOSFET drive output.
Ballast MOSFET drive output.
Power Factor MOSFET drive output.
Positive supply for the IC.
Buffered output for the 7.5V voltage
reference.
and OVP comparator input.
18-Pin SOIC (S18)
1
2
3
4
5
6
7
8
9
ML4833
TOP VIEW
18
17
16
15
14
13
12
10
11
PVFB/OVP
V
VCC
PFC OUT
OUT A
OUT B
P GND
GND
C
REF
RAMP