CP494 Datasheet, PDF (7/11 Pages) Ceramate Technical – SWITCHMODE Pulse Width Modulation Control Circuit

CP494
SWITCHMODE Pulse Width Modulation Control Circuit
V_in
V_ref
Error Amplifier
+ Under Test
-
+
-
Other Error
Amplifier
Feedback
Terminal
(Pin 3)
Figure 10. Error–Amplifier Characteristics
Each
Output
Transistor
15V
C
Q
E
R_L
68
V_C
C_L
15pF
90%
V_CC
10%
t_r
90%
10%
t_f
Figure 12. Common–Emitter Configuration
Test Circuit and Waveform
Test
Inputs
50k
V_CC = 15V
150 150
2W 2W
V_CC
Deadtime
C1
Output 1
E1
Feedback
R_T
C2
Output 2
C_T
E2
(+)
(-) _Error
(+)
(-)
Output
Ref
Control
Out
Gnd
Figure 11. Deadtime and Feedback Control Circuit
Each
Output
Transistor
15V
C
Q
E
R_L
68
V_EE
C_L
15pF
90%
10%
Gnd
t_r
90%
V_EE
10%
t_f
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
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Fax:[phone]
Page 7 of 11
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Http: www.ceramate.com.tw
Rev 1.0 Apr.19,2004