CP494 datasheet(6/11 Pages) CERAMATE | SWITCHMODE Pulse Width Modulation Control Circuit

6 page

CP494

SWITCHMODE Pulse Width Modulation Control Circuit

* All specs and applications shown above subject to change without prior notice.

1F-5 NO.66 SEC.2 NAN-KAN RD ., LUCHU ,

TAOYUAN, TAIWAN

Email: server@ceramate.com.tw

Tel:886-3-3214525

Http: www.ceramate.com.tw

Fax:886-3-3521052

Page 6 of 11

Rev 1.0 Apr.19,2004

Figure 4. Open Loop Voltage Gain and

Phase versus Frequency

Figure 5. Percent Deadtime versus

Oscillator Frequency

Figure 6. Percent Duty Cycle versus

Deadtime Control Voltage

1.0

100

1.0 k

10 k

100 k

1.0 M

f, FREQUENCY (Hz)

AVOL

100

120

140

160

180

VCC = 15 V

DVO = 3.0 V

RL = 2.0 kW

Figure 7. Emitter–Follower Configuration

Output Saturation Voltage versus

Emitter Current

500 k 1.0 k

10 k

100 k

500 k

fosc, OSCILLATOR FREQUENCY (Hz)

CT = 0.001 mF

0.001 mF

1.0

2.0

3.0

3.5

VDT, DEADTIME CONTROL VOLTAGE (IV)

VCC = 15 V

VOC = Vref

1.CT = 0.01 mF

2. RT = 10 kW

2.CT = 0.001 mF

2. RT = 30 kW

Figure 8. Common–Emitter Configuration

Output Saturation Voltage versus

Collector Current

100

200

300

400

IE, EMITTER CURRENT (mA)

100

200

300

400

IC, COLLECTOR CURRENT (mA)

Figure 9. Standby Supply Current

versus Supply Voltage

5.0

VCC, SUPPLY VOLTAGE (V)

120

110

100

8.0

6.0

4.0

2.0

1.9

1.8

1.7

1.6

1.5

1.4

1.3

1.2

1.1

2.0

1.8

1.6

1.4

1.2

1.0

0.8

0.6

0.4

9.0

8.0

7.0

6.0

5.0

4.0

3.0

2.0

1.0

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