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

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Tel:886-3-3214525

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Page 8 of 11

Rev 1.0 Apr.19,2004

Figure 14. Error–Amplifier Sensing Techniques

Figure 15. Deadtime Control Circuit

Figure 16. Soft–Start Circuit

Figure 17. Output Connections for Single–Ended and Push–Pull Configurations

Voltage of

System

R1

1

2

R2

+

Error

Amp

Positive Output Voltage

3

+

1

2

R2

R1

Negative Output Voltage

-

To Output

Voltage of

System

Error

Amp

-

R1

R2

Output

Control

Output

Q

4

5

6

0.001

30k

Max. % on Time, each output ≈ 45 -

80

1 +

Output

Q

4

Output

Control

Single-Ended

1.0 mA to

500 mA

Push-Pull

1.0 mA to

250 mA

Output

Control

1.0 mA to

250 mA