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1
CN1
F1
1
2
5A, 1206
3
SLEEP
4
VDDA
5
6
C1
D
100nF
Molex 53261-0690
R3
R4
NC
20K
430K
BRITE
R9
C2
12K
100nF
U1
1
GND
2
AOUT
AOUT
C
3
BOUT
BOUT
VDDA
4
DD_CLK
R11
5
200K 1%
DIM_MODE
R13 10K 1%
6
BRITE_OUT
R14 10K
7
BRITE_R
8
BRITE
BRITE_IN
LX1691
DL4448/CYL
D6
1
CS1
B
D10
2
CS2
DL4448/CYL
C26
C27
R38
R39
10K
10K
10nF
10nF
DL4448/CYL
D12
1
CS3
D14
2
CS4
DL4448/CYL
C31
C32
R43
R44
10K
10K
10nF
10nF
DL4448/CYL
D15
1
VS1
D17
2
VS2
A
DL4448/CYL
C34
C35
R48
R49
10K
10K
10nF
10nF
1
2
VBUSS
BC847A
VDDP
Q1
R1
3
2
330 Ohm, 0805
R2
4.3K
MMBT2907A
1
Q2
R6
R5
10k
27K
R7
200K
D1
MMSZ6V2
R8
Q3
1
SLEEP
10K
BC847A
R10
4.3K
VDDP
C3
470nF
16
VDDP
VDDA
C4
100nF
15
VDDA
14
OC_SNS
OC_SNS
C5
4.7nF
13
OV_SNS
OV_SNS
12
I_SNS
I_SNS
R12
C6
10K
C7
10nF
11
4.7nF
EA_OUT
R15
100K 1%
10
I_R
VDDP
9
ENABLE
Lamp current frequency formula:
Fout = 5.24÷R15
D7
D8
DL4448/CYL
D9
1
3
3
2
D11
DL4448/CYL
BAW56
BAW56
C28
C29
R40
R41
10nF
10K
10K
10nF
D13
VDDP
R42
3
1M
C30
BAW56
100nF
3
+
VDDA
1
R45
I_SNS
D16
2
-
R46
D18
43K
3
LM393M
BAV70
3.3K
U4A
3
C33
R47
BAW56
20K
R50
220pF
3.3K
2
3
4
1
T1
VBUSS
2
3
SGE2655-3
C10
U2
22uF 20% 25V
1
8
R20
2
7
AOUT
39 Ohm
OC_SNS
3
6
R21
4
5
1
T2
BOUT
39 Ohm
2
Si9945AEY
3
SGE2655-3
1
T3
VBUSS
2
3
SGE2655-3
C19
U3
22uF 20% 25V
1
8
R31
2
7
AOUT
39 Ohm
OC_SNS
3
6
R32
4
5
1
T4
BOUT
39 Ohm
2
Si9945AEY
3
VS3
SGE 2655-3
VS4
VDDA
U4B
LM393M
5
+
7
6
-
2
I_LMPS1
1
I_LMPS2
3
4
5
5
C8
100nF 20% 50V
C9
4
CS1
10pF 3KV
220pF 16V
C11
R17
130 Ohm 1%
C12
R18
D2
390 Ohm
D3
BAV70
3.3nF
2
2
3
3
2
OV_SNS
1
1
BAV70
C13 100nF 20% 50V
5
C14
4
CS2
220pF 16V
10pF 3KV
C15
R23
130 Ohm 1%
C16
R25
390 Ohm
3.3nF
2
C17 100nF 20% 50V
5
C18
4
CS3
10pF 3KV
220pF 16V
C20
R28
130 Ohm 1%
C21
R29
D4
390 Ohm
D5
3.3nF
BAV70
2
2
3
3
2
OV_SNS
1
1
BAV70
5
C22
100nF 20% 50V
C23
4
CS4
10pF 3KV
220pF 16V
C24
R34
130 Ohm 1%
C25
R36
390 Ohm
3.3nF
2
VBrite_out = R13 * VDDA ÷(R11 + R13)
Lamp Current = VBrite_out * 1.54 ÷Rx where Rx = R24 = R35
Title
Size
Number
Orcad B
Date:
10-Jan-2005
File:
D:\inverter\Microsemi\4LAMP _SCH.DDB Drawn By:
5
6
CN2
1
2
JST SM02 B-BHSS-1-TB
VDDP
R16
CN2A
100K
1
D
R19
2
10K
3
4
BC847A
3
JST SM04(4.0) B-BHS-1-TB
VS1
Q4
CN3
1
2
JST SM02 B-BHSS-1-TB
VDDP
I_LMPS1
R22
100K
R26
R24
330 Ohm 1%
10K
BC847A
3
VS2
Q5
C
CN4
1
2
JST SM02 B-BHSS-1-TB
VDDP
R27
CN3A
100K
1
R30
2
10K
3
4
BC847A
3
JST SM04(4.0) B-BHS-1-TB
VS3
Q6
CN5
1
2
JST SM02 B-BHSS-1-TB
VDDP
B
I_LMPS2
R33
100K
R37
R35
330 Ohm 1%
10K
BC847A
3
VS4
Q7
A
Revision
Sheet of
6
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