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TL494 Datasheet(PDF) 9 Page - ON Semiconductor |
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TL494 Datasheet(HTML) 9 Page - ON Semiconductor |
9 / 12 page 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 TL494, NCV494 http://onsemi.com 9 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 RT CT 6 5 Vref RT CT Master Vref Slave (Additional Circuits) RT CT 5 6 Vin > 40V RS VZ = 39V 1N975A VCC 5.0V Ref 12 270 Gnd 7 +Vin = 8.0V to 20V 1 2 3 15 16 + − − + Comp OC VREF DT CT RT Gnd E1 E2 13 14 45679 10 1M 33k 0.01 0.01 VCC C1 C2 8 11 47 47 10 + 10k 4.7k 4.7k 15k Tip 32 + T1 1N4934 L1 1N4934 240 + 50 35V 4.7k 1.0 22 k + +VO = 28 V IO = 0.2 A 12 All capacitors in mF TL494 0.001 50 35V 50 25V Tip 32 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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