Led Driver; Overvoltage Protection Circuit - Philips 32PFL8605H/12 Service Manual

1
BLANK
PWM-CLOCK-BUF
4
PROG
SPI-CLOCK-BUF
SPI-DATA-IN-BUF
3
SPI-DATA-IN
3B00-3
SPI-DATA-OUT
3B00-2
2
LATCH
150R
The Overvoltage Protection Circuit is built around item no.
7B50, 7B51, 7C20 and 7C22 (diagram AL1B). Refer to figure
7-35 Overvoltage Protection Circuit.
+24V
7B23-1
BC847BS(COL)
6
2
1
FB30
PWM-B1
+24V
5
7B23-2
BC847BS(COL)
3 1
5 3
4
FB31
PWM-R1
+24V
7B25
BC847BW
3
1
FB32
PWM-G1
For the component placement on the LED PWD, refer to
Component placement LED board.
3B00-1
8
150R
3B00-4
5
150R
6
150R 3B21
+3V3
FB20
7
Figure 7-34 LED driver
7000
7001
99-235/RSBB7C-A24/2D
99-235/RSBB7C-A24/2D
BLUE 6 5 BLUE 6 5
GREEN 2 1 GREEN 2 1
RED 4 3 RED 4 3
Figure 7-35 Overvoltage Protection Circuit
7-36
Circuit Descriptions
+3V3
7B26-1
TLC5946RHB
VCC
31
BLANK
24
GSCLK
3B18 26
IREF
FB35 3
1K8
MODE
1
SCLK
2
SIN
23
SOUT
150R
22
XERR
3B22 25
XHALF
10K 32
XLAT
12
13
28
NC
29
GND GND_HS
7002 7003 7004
99-235/RSBB7C-A24/2D 99-235/RSBB7C-A24/2D 99-235/RSBB7C-A24/2D
BLUE 6 5 BLUE 6 5
GREEN 2 1 GREEN 2 1
RED 4 3 RED 4 3
back to
div. table
Q551.1E LA 7.
2B11
100n
4
PWM-R1
0
5
PWM-G1
1
6
PWM-B1
2
7
PWM-G3
3
8
PWM-R3
4
9
PWM-R2
5
10
PWM-G2
6
11
PWM-B2
7
OUT
14
PWM-B3
8
15
PWM-G4
9
16
PWM-R4
10
17
PWM-B4
11
18
PWM-B5
12
19
PWM-G5
13
20
PWM-R5
14
21 DATA-SWITCH
15
3B31
2K0
7B26-2
TLC5946RHB
34 VIA 42
35 41
VIA VIA
36 40
VIA
18770_217_100126.eps
3B35
7005
270R
99-235/RSBB7C-A24/2D
3B36
BLUE 6 5 BLUE 6
270R
3B37
GREEN 2 1 GREEN 2
68R
RED 4 3 RED 4
3B03-1
1 8
1K5
3B03-2
2 7
1K5
3B03-3
3 6
1K5
3B03-4
4 5
1K5
18770_218_100126.eps
EN 67
+3V3
100126
+24V
100126
2010-Oct-01