ml4877 Microsemi Corporation, ml4877 Datasheet - Page 2

• Manufacturer Part Number: ml4877
• Description: Desktop Backlight Lamp Driver
• Manufacturer: Microsemi Corporation

ML4877
PIN CONFIGURATION
PIN DESCRIPTION
PIN
2
10
1
2
3
4
5
6
7
8
9
NAME
LEA+
AZR
SS CAP
R
VREF
L ILIM
LEA-
LEA OUT
C
L RTD
T
T
FUNCTION
Positive input for lamp error amp
Connection to gate of external FET for
high voltage regulator. Internally a
zener diode to ground.
Connection of optional external soft
start capacitor
Oscillator timing resistor
Voltage reference output
Input to current limit amplifier
Negative input for lamp error
amplifier
Output of lamp error amplifier.
External compensation capacitor
connects between this pin and LEA.
Oscillator timing capacitor
Input to resonant threshold detector
LEA OUT
SS CAP
L ILIM
L RTD
LEA+
VREF
LEA–
AZR
R T
C T
20-Pin SSOP (R20)
10
1
2
3
4
5
6
7
8
9
TOP VIEW
ML4877
PIN
11
12
13
14
15
16
17
18
19
20
NAME
B SYNC
OUT
HVDD
VDD
L GATE1
ON/OFF
L GATE2
PGND
GND
B ON
B OFF
20
19
18
17
16
15
14
13
12
11
B OFF
B ON
GND
PGND
L GATE 2
ON/OFF
L GATE 1
VDD
HVDD
B SYNC OUT
FUNCTION
Logic input for chip
Output of MOSFET driver to gate of
synchronous FET catch diode.
Battery power input to linear regulator
Output of linear regulator. Positive
power for IC.
Output of MOSFET driver. Connection
to gate of one side of inverter FET
drive pair.
Output of MOSFET driver. Connection
to gate of one side of inverter FET
drive pair.
Power ground
Signal ground
Connection to primary side of gate
pulse transformer
Output of MOSFET driver. Connection
to gate of FET that disables the input
power.