CP494
SWITCHMODE Pulse Width Modulation Control Circuit
120
110
100
90
80
70
60
50
40
30
20
10
0
20
18
V
= 15 V
DV = 3.0 V
CC
16
14
12
10
8.0
6.0
4.0
2.0
0
O
R = 2.0 kW
0
C = 0.001 mF
T
L
20
A
VOL
40
60
80
φ
100
120
140
160
180
0.001 mF
1.0
10
100
1.0 k
10 k
100 k
1.0 M
500 k 1.0 k
10 k
100 k
500 k
400
40
f, FREQUENCY (Hz)
f
, OSCILLATOR FREQUENCY (Hz)
osc
Figure 4. Open Loop Voltage Gain and
Phase versus Frequency
Figure 5. Percent Deadtime versus
Oscillator Frequency
50
40
30
20
10
0
1.9
1.8
1.7
1.6
1.5
1.4
1.3
1.2
1.1
1
V
V
= 15 V
= V
CC
OC
ref
2
ą1.ăC = 0.01 mF
T
ą2.ăR = 10 kW
T
ą2.ăC = 0.001 mF
T
ą2.ăR = 30 kW
T
0
1.0
2.0
3.0
3.5
0
100
200
300
V
, DEADTIME CONTROL VOLTAGE (IV)
I
EMITTER CURRENT (mA)
DT
E,
Figure 6. Percent Duty Cycle versus
Deadtime Control Voltage
Figure 7. Emitter–Follower Configuration
Output Saturation Voltage versus
Emitter Current
10
9.0
8.0
7.0
6.0
5.0
4.0
3.0
2.0
1.0
0
2.0
1.6
1.4
1.2
1.8
1.0
0.8
0.6
0.4
0
5.0
10
15
, SUPPLY VOLTAGE (V)
CC
20
25
30
35
0
100
200
300
400
I , COLLECTOR CURRENT (mA)
C
V
Figure 8. Common–Emitter Configuration
Output Saturation Voltage versus
Collector Current
Figure 9. Standby Supply Current
versus Supply Voltage
* 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
Page 6 of 11
Rev 1.0 Apr.19,2004
Fax:886-3-3521052
CERAMATE [ CERAMATE TECHNICAL ]
