CP494
SWITCHMODE Pulse Width Modulation Control Circuit
V
CC
= 15V
150
2W
150
2W
V
CC
Error Amplifier
Under Test
Deadtime
C1
E1
Output 1
Test
Inputs
+
-
Feedback
V
in
C2
E2
Output 2
R
C
T
T
Feedback
Terminal
(Pin 3)
(+)
(-)
(+)
(-)
Error
Gnd
+
Ref
Out
Output
Control
V
ref
-
Other Error
Amplifier
50k
Figure 10. Error–Amplifier Characteristics
Figure 11. Deadtime and Feedback Control Circuit
15V
15V
R
L
68
C
V
C
Each
Output
Transistor
C
E
Q
Each
Output
Transistor
C
L
15pF
V
EE
Q
E
R
L
68
C
L
15pF
90%
90%
90%
90%
V
EE
V
CC
10%
10%
10%
Gnd
10%
t
r
t
f
t
r
t
f
Figure 12. Common–Emitter Configuration
Test Circuit and Waveform
Figure 13. Emitter–Follower Configuration
Test Circuit and Waveform
* All specs and applications shown above subject to change without prior notice.
1F-5 NO.66 SEC.2 NAN-KAN RD ., LUCHU , TAOYUAN, TAIWAN
Tel:886-3-3214525
Email: server@ceramate.com.tw
Http: www.ceramate.com.tw
Rev 1.0 Apr.19,2004
Page 7 of 11
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CERAMATE [ CERAMATE TECHNICAL ]
