CP494 datasheet(9/11 Pages) CERAMATE

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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 9 of 11

Rev 1.0 Apr.19,2004

L1 - 3.5 mH @ 0.3 A

T1 - Primary: 20T C.T. #28 AWG

T1 - Secondary: 12OT C.T. #36 AWG

T1 - Core: Ferroxcube 1408P-L00-3CB

Figure 18. Slaving Two or More Control Circuits

Figure 19. Operation with Vin > 40 V Using

External Zener

Figure 20. Pulse Width Modulated Push–Pull Converter

Vref

Master

Vref

Slave

(Additional

Circuits)

Vin > 40V

VZ = 39V

1N975A

VCC

5.0V

Ref

270

Gnd

+Vin = 8.0V to 20V

Comp

OC VREF DT CT RT Gnd E1 E2

45679 10

33k

0.01 0.01

VCC

10k

4.7k

15k

Tip

1N4934

240

35V

4.7k

1.0

+VO = 28 V

IO = 0.2 A

All capacitors in mF

CP494

0.001

35V

25V

Tip

Test

Conditions

Results

Line Regulation

Vin = 10 V to 40 V

14 mV 0.28%

Load Regulation

Vin = 28 V, IO = 1.0 mA to 1.0 A

3.0 mV 0.06%

Output Ripple

Vin = 28 V, IO = 1.0 A

65 mV pp P.A.R.D.

Short Circuit Current

Vin = 28 V, RL = 0.1 W

1.6 A

Efficiency

Vin = 28 V, IO = 1.0 A

71%

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