ml4877 Microsemi Corporation, ml4877 Datasheet - Page 9

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

10k
DIMMING
R1
F1 4A
10k
GND
V DD
220µF
R7
C24
220µF
2
3
C22
1N4148
CR3
–
+
10k
1
R13
C21
J1
1
2
3
1nF
U1B
J1
4.7nF
1N4148
91k
C18
C19
1nF
R8
CR4
2N3904
2
1
Q5
10k
C13
1µF
R2
0.1µF
1N4148
C20
CR2
1k
R15
R14
1k
2N3906
6.2k
C23
IRF7416
1nF
Q3
R4
4.7nF
Figure 5. 30W Backlight CCFL Inverter with PWM Dimming
C17
Q4
2N3904
PWM Control
200
390k
R18
Q6
R6
47pF
10
C16
1
2
3
4
5
6
7
8
9
0.033µF
20
R16
LEA+
AZR
SS CAP
R T
VREF
L ILIM
LEA–
LEA OUT
C T
L RTD
C10
2N3904
2N3906
Q7
20
R17
10k
R10
ML4877
Q8
C15
1µF
U2
B SYNC OUT
1
5
6
L GATE 2
L GATE 1
ON/OFF
J2
+
–
HVDD
PGND
B OFF
U1A
B ON
GND
8
4
VDD
2
7
20
19
18
17
16
15
14
13
12
11
CR6
SK34MSCT
22µH
L1
30k
C11
7.5k
1µF
R5
CR5
R6
C14
1µF
143k
IRLR2905
R9
10k
Q1
C12
1µF
0.2
R11
R3
1W
MKS-10
0.22µF
63V
C1
4, 10
IRLR2905
0.2
R12
3
9
1W
Q2
5.1V
CR1
T1 1
12
5
8
68pF
68pF
68pF
68pF
68pF
68pF
68pF
68pF
C2
C4
C9
C3
C5
C6
C8
C7
ML4877
1kV
1kV
1kV
1kV
1kV
1kV
1kV
1kV
10
11
10
11
J2
1
2
3
4
5
6
7
8
9
J3
1
2
3
4
5
6
7
8
9
9