Datex-Ohmeda 7900 - Page 175

8 /Schematics
7900 Ventilator- 1503-0151-000 1-97 8-19
Figure 8-18
Power supply board schematic diagram, page 2 of 5
10V
4700UF
C36
20%
35V
C20
1000UF
20%
1000UF
35V
C34
20%
TC54VN4502
U12
U20
AD822AR
T1
20%
C19
2200UF
35V
C39
100UF
10V
20%20%
C43
100UF
10V
SH5
POWER_ON
U16
LM2940CT-15
6.2V
CR35
5234
Q10
D45C11
RFP50N05L
Q8
RFP50N05L
Q7
CR20
5248
18V
R138
1%
10K
1/8W
10%
C68
0.1UF
50V
2.2UF
C27
25V
80/-20%
R123
10K
1/8W
1%
CR10
914
CR34
914
C28
0.1UF
50V
10%
CR31
914
R115
1%
200K
1/8W
R111
1%
200
1/8W
U20
AD822AR
CR8
914
TC54VN4502
U25
E3
C47
10UF
35V
20%
R137
1%
107K
1/8W
50V
0.1UF
C109
10%
C77
10%
0.1UF
50V
1%
1/8W
499K
R18
107K
R19
1/8W
1%
J3
1%
1/8W
20K
R56
C33
22UF
20V
20%
BSS138
Q18
C76
3.3UF
35V
20%
E6
5R5_VAUX
5R5_VAUX
5R5_VAUX
U9
MAX796
22.1
R21
1/8W
1%
DL4004
CR37
914
CR36
2.00K
R120
1/8W
1%
100K
R114
1/8W
1%
0.1UF
C106
50V
10%
1/8W
10K
R128
1%
1/8W
130K
R127
1%
1/8W
11.5K
R125
1%
CR26
MBRS1100T3
E2
E4
DL4004
CR9
CR32
MBRS1100T3
50V
0.1UF
C110
10%
914
CR23
20%
C12
10UF
35V
35V
10UF
C69
20%
R24
10
2W
5%
C18
2200PF
100V
20%
R94
52.3K
1/8W
1%
1%
1/8W
20K
R131
1%
1/8W
10K
R130
10%
50V
C79
0.1UF
10%
50V
C78
0.1UF
REM_ON+
SH4
10%
50V
0.01UF
C7
1%
1/8W
47.5K
R132
VH_EL
VH_EL
CR7
ES3B
1%
1/8W
200
R20
0.1UF
C82
50V
10%
R81
2.21K
1/4W
1%
0.1UF
C75
50V
10%
1%
1/8W
R121
4.75K
10%
50V
0.1UF
C100
Q5
BSS138
R33
2.00K
1/8W
1%
1/8W
R35
2.00K
1%
E1
AGND
AGND
20%
35V
C40
10UF
20%
35V
3.3UF
C107
10%
50V
0.01UF
C37
CR38
DL4004
1/8W
R122
0.1%
499
3904
Q20
VR2
LP2952IN
VR3
MIC29152BT
E5
VDD
VDD
VDD
U23
MIC29300-5.0BT
1%
1/8W
20K
R83
VB
SH1,5
1%
1/8W
66.5K
R93
1%
1/8W
499K
R17
1MEG
1%
1/8W
R140
PJ2
R82
422K
1/8W
1%
26.7K
1%
1/8W
R84
0.018
1%
1W
R25
15K
0.1%
1/8W
R117
1/8W
R118
0.1%
499
15K
0.1%
1/8W
R116
0.2
1%
1/4W
R90
R36
1/4W
1%
0.2
R62
1/4W
1%
0.2
0.2
1%
1/4W
R64
LM385M-2.5
U19
27.4
1%
1.5W
R31
2N3904
Q9
33.2
1/8W
1%
R32
33UF
20%
25V
C45
33UF
20%
25V
C21
15UF
20%
25V
C25
100UF
20%
16V
C15
100UF
20%
16V
C13
100UF
20%
16V
C16
VSW
COM
VIN OUT
2
1
3
3
2
8
4
1
2
3
4
5
10
12
6
7
9
VINVOUT
COM
1
3
2
5
6
7
COM
VIN OUT
3
1
2
-15V
+15V
1
10
11
12
13
15
2
3
4
5
6
7
8
9
14
17
18
16
VDD
+5.5V
VLV+
FB CSL
SECFB
REF
GND
SHDN
SS
SYNC
BST
DH
LX
DL
PGND
CSH
1110
79
2
3
4
6
1
5
14
16
15
13
12
8
+5.5V
VB
5VTAP
FEEDBACK
G1 G2 G3 G4 G5 G6
INPUT OUTPUT
REF SENSE
ERROR
SHUTDOWN
7
8
345101112
913
614
2
1
OUTIN
ADJEN
GND
42
51
3
VDD
VIN VOUT
COM
2
3
1
8
4
[10.34/11.57V)
NC
PGND4PGND3
B_LO
B_HI
VB
14.5V
for Test
Connect
DGND
DGND
AUX_GND
AUX_GND
AUX_GND
VA_P15
VA_N15
DGND
REM_ON-
2.5V