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CM8500A
3A BUS TERMINATOR
APPLICATION CIRCUIT
R3 200k
2
1
VDD
pin3:connect to external voltage (-)
C2
104
J1
VTT
1
2
C4
104
J2
DC-INPUT
1
2
When external voltage applied ,pin1,2 should be open
C12
100uf/6.3V
C8
102
J3
Vref-OUT
1
2
Vtt=1/2 external voltage
R6,R7(option circuit)forVttVOLTAGEADJUST
and pin2:connect to external voltage (+)
TP1
BNC
1
3
4
VCC
NOTE:
J4ON/OFF
J3:referance output provided from Vtt
C14
100uf/6.3V
R1
5R1
L1
3.3uH
C7
820uf/6.3V
R8
100
C3
104
C11
100uf/6.3V
open:off(into shutdown mode)
VDD
VCC
J5
IN/EXT
2
1
3
R4
1k
2
1
C10
10uf/6.3V
C1
104
J6:reference output provided from shunt regulator
VDD
C16
470uf/6.3V
C13
104
C15
10uf/6.3V
C9
100uf/6.3V
R5
100k
2
1
U1 CM8500A
2
1
3
13
14
15
16
4
5
6
7
8
9
10
11
12
VDD1
VCC1
VL1
PGND2
VL2
VDD2
VCC2
PGND1
AGND1
SD
2/VCC
G-sense AGND3
VCCQ
FB
AGND4
J5:pin1 ,pin2 short:Vtt = 1/2Vcc
D5
SK12
R6
10k
2
1
J4:short :Demo kit on .
C6
102
D6
SK12
C5
104
R7
10k
2
1
Vtt=(Vcc*R6)/R6+R7
Figure 1. CM8500A Typical Application
(Schematic of CM8500ATEVAL)
2004/12/20
Champion Microelectronic Corporation
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