A
A
B
B
C
C
D
D
E
E
4 4
3 3
2 2
1 1
On/Off Switch
+12V Boost
(12.1V nominal)
Float Voltage
On/Off Circuit
18V Boost - Mosfet Gate Voltage
Current Limit
(1.5 Amp)
+5V Linear
Low
Dropout
Battery
Charger
Heatsink
forQ312
Ibatt=0: BattCurr=0.74V
Ibatt=1.5: BattCurr=2.87V
Heatsink
for D301
620017.dsn
Rick Myers
Rick Myers
Mar 5, 1999
Mar 5, 1999
5-39121
JAC 3/15/99 LPP
L. Phillips
Z. Psenicnik
J. Bello
3/16/99
3/16/99
3/16/99
B See ECN worksheet LPP LPP5-39455 4/27/99
D
Improvements for ESD, RFI,
and Fast Transients, Correct
Respiration Diff-Amp Topology
5-39821 LPP 6/24/99
E
Mods to U2 clock line, Resp
gain amp, ECG supply and
NVRAM pullup
5-39936 LPP 7/9/99
LPP
620017 E
DC/DC Power Supplies
C
38
Tuesday, July 13, 1999
Title
Size
Document Number
Rev
Date: Sheet of
Welch Allyn Inc.
Schematic:
Release For Production
Approved
Checked
Designed
Drawn
Initial Date
REV
Description
ECN/ECO Init
Date Ckd
A Release to Production
U304-1
Q306-b
U301-ct
U305-1
U302-pwr
Q302-c
U305-6
Q305-d
Q307-e
Q308-d
U302-comp
U302-fb
U304-5
C324-2
U302-ct
Q310-b
U304-3
Q305-s
U303-ct
Q304-e
RT301-1
U303-5 U305-pwr
R339-2
Bat-Adj
U304-7
U305-2
Q306-c
D307-A
U302-sense
U305-3
Bat-fuse
U302-out
Q308-g
U304-2
V+18V
I-Batt
Q309-3
U304-6
C319-1
Q312-g
U301-comp
Q309-b
U305-5
C305-1
D312-c
Q313-d
Q314-d
U301-sw
U303-out
U301-pwr
U301-7
Q305-g
u307-6
Batt-fb
U303-fb
U303-cp
D304-C
L302-1
Q303-s
Q302-B
Q301-b
C339-1
Q310-c
D309-a
R343-1
F302-2 AC+12V-fuse
5VRef
5VRef
Ref-Batcharge
+12V
ACON
ACON
Ref-Batcharge
Battery
On/Off
+5V
AC+12V
+Vpump
Ref-Batcharge
VBackup
+3.3V
BattVoltage
BattCurrent
AC+12V-fuse
AC+12V-fuse
AC+12V-fuse
AC+12V-fuse
Rec+DCV
+Vfuse
+12V
+12V
D D
D
DDD
+12V
D
+5V
TP340
TP321
Q305
MTP30N06VL
23
1
4
TP335
U306
LF33CV
1 3
2
IN OUT
GND
C326
.01uF
D301
MBR2535CTL
1
3
2
4
+
C323
100uF
R333
19.6K
TP322
+
C325
100uF
R347
10K
D308 BAV99L
1
3
2
C322
.047uF
TP345
R350
10K
Q312
MTP30N06VL
2 3
1
4
L305
Bead
TP302
R306
61.9K
TP341
D302
BAV99L
1
3
2
F303
4Amp
R339
19.6K
+
C331
4.7uF
TP323
TP304
D303
5.1V
13
C305
5600pF
+
-
U305B
MC34072
5
6
7
8 4
+
C306
1uF
R335
4.32K
TP355
+
C332
4.7uF
TP348
TP331
R311
10K
TP328
R349
10K
TP307
U301
MC34063AD
53
7
8
1
2
6
4
COMPTCAP
IPK
IDC
ISWC
ISWE
Vcc
GND
TP315
Q310
MMBT3904L
3
1
2
D309
BAV70L
1
3
2
TP346
R341
10K
+
-
U304A
MC34072
3
2
1
8 4
TP330
D310
MBRS340T3
TP306
C333
.047uF
C314
.047uF
R332
19.6K
+
C312
1000uF
R319
19.6K
R353
5.11K
C307
.047uF
C337
.047uF
HS302
6078
R331
33.2K
R302
1.96K
Q311
MTP30N06VL
23
1
4
R301
10K
+
C319
1000uF
R310
10K
TP332
C324
1000pF
U302
UC3843A
3
57
14
1
10
8 12
9 11
VFB
ISENSERT/CT
VREF
COMP
OUT
PWR-GND Vcc
GND Vc
D312
BAV99L
1
3
2
C340
.047uF
TP316
R312
3.83K
D313
NO LOAD
1
3
2
R304
100K
R355
14.7K
TP350
TP305
+
C302
1uF
R327
0.1
C309
5600pF
+
-
U305A
MC34072
3
2
1
8 4
+
C310
1000uF
L302
22uH
D304
MBRS340T3
L306
Bead
R325
1.96K
R344
10K
TP329
R307
4.64K
TP347
R338
1K
13
2
+
C301
330uF
U303
UC3843A
3
57
14
1
10
8 12
9 11
VFB
ISENSERT/CT
VREF
COMP
OUT
PWR-GND Vcc
GND Vc
R322
10K
R324
10K
L304
47uH
R318
10K
t
RT301
10K
R340
10K
Q307
MMBT3904L
3
1
2
U307
LP2951CD-3.3
8
7
3
6
2
1
5
4
VIN
FDBK
SHTDN
TAP
SENS
VOUT
ERR
GND
Q313
2N7002
3
1
2
R329
1K
R337
8.87K
Q314
2N7002
3
1
2
F301
4Amp
D311
BAV70L
1
3
2
R334
19.6K
Q306
MMBT3904L
3
1
2
R315
196
R330
33.2K
Q304
MMBT3904L
3
1
2
D305
BAV99L
1
3
2
C338
.047uF
C335
.047uF
TP336
Q301
MPSW51A
3
2
1
C316
2200pF
+
C339
1uF
C327
.047uF
+
C329
100uF
R345
10K
D306
MBRS340T3
Q309
MMBT3906L
3
1
2
R303
51.1K
TP339
C330
.047uF
+
-
U304B
MC34072
5
6
7
8 4
+
C318
330uF
TP337
Q302
MMBT3904L
3
1
2
D307
MBRS340T3
TP326
R352
5.11K
R323 1.96K
TP324
C328
.047uF
R313
1.96K
R326
10
TP354
+
C304
100uF
R354
5.11K
+
C311
1000uF
TP317
R314
10
TP313
TP311
R351
5.11K
C315
.047uF
R348
10K
TP338
Q308
MTP23P06V
2
1
3
4
TP320
R346
100
TP351
Q303
MTP30N06VL
2 3
1
4
TP318
TP343
F302
4Amp
R342
19.6K
TP314
TP352
TP342
C334
.047uF
C303
470pf
R309
4.64K
TP312
C321
.01uF
TP349
TP333
R320
7.5K
C336
.047uF
L303
Bead
C320
.01uF
R336
7.5K
R317
7.5K
+
C313
330uF
R343
10K
TP309
R305
1
C308
2200pF
TP308
R316
0.1
R321
27.4K
R328
1K
L301
1mH
TP344
TP310
TP319
R308
17.8K
HS301
6078
TP353
TP334
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