CP494
SWITCHMODE Pulse Width Modulation Control Circuit
1.0mH @ 2A
+V = 10V to 40V
in
+V = 5.0 V
O
Tip 32A
I
O
= 1.0 A
47
150
47k
12
0.1
8
11
1.0M
V
CC
C
1
C
2
3
Comp
-
2
5.1k
5.1k
1
+
+
50
50V
14
15
16
CP494
V
ref
+
500
10V
-
MR850
5.1k
150
+
C
T
R
D.T. O.C. Gnd
13
E
E
2
T
1
+
50
10V
5
6
4
7
9
10
0.001
47k
0.1
Figure 21. Pulse Width Modulated Step–Down Converter
Test
Conditions
= 8.0 V to 40 V
Results
Line Regulation
Load Regulation
Output Ripple
V
in
V
in
V
in
V
in
V
in
3.0 mV
5.0 mV
0.01%
= 12.6 V, I = 0.2 mA to 200 mA
0.02%
O
= 12.6 V, I = 200 mA
40 mV pp
P.A.R.D.
O
Short Circuit Current
Efficiency
= 12.6 V, R = 0.1 W
250 mA
72%
L
= 12.6 V, I = 200 mA
O
* 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 10 of 11
Fax:886-3-3521052
CERAMATE [ CERAMATE TECHNICAL ]
