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TNY253 Datasheet(PDF) 6 Page - Power Integrations, Inc. |
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TNY253 Datasheet(HTML) 6 Page - Power Integrations, Inc. |
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6 / 18 page  Rev. F 08/16 6 www.power.com TNY253/254/255 TNY253/254/255 Figure 9. 1.3 W TV Standby Circuit using TNY253. Figure 10. 10 W Standby Supply Circuit. use of a low cost EE16 core transformer up to the 10 W level. Figure 10 shows a 5 V, 10 W circuit for such an application. The circuit operates from the high-voltage DC supply already available from the main power supply. Capacitor C1 filters the high-voltage DC supply, and is necessary only if there is a long trace length from the source of the DC supply to the inputs of the standby circuit. The high-voltage DC bus is applied to the primarywindingofT1inserieswiththe integratedhigh-voltage MOSFET inside the TNY255. The diode D1, capacitor C2 and resistor R1 comprise the clamp circuit that limits the turn-off voltage spike on the TinySwitch DRAIN pin to a safe value. The secondary winding is rectified and filtered by D2 and C4 to provide the 5 V ouput. Additional filtering is provided by L1 and C5. The output voltage is determined by the sum of the optocoupler U2 LED forward drop (~ 1 V) and Zener diode VR1 voltage. The resistor R2, maintains a bias current through theZenertoimproveitsvoltagetolerance.Fortightertolerance, a TL431 precision reference IC feedback circuit may be used. Cellular Phone Charger The TinySwitch is well suited for applications that require a constant voltage and constant current output. TinySwitch is always powered from the input high-voltage, therefore it does not require bias winding for power. Consequently, its opera- tion is not dependent on the level of the output voltage. This allows for constant current charger designs that work down to zero volts on the output. PI-2242-082898 TinySwitch D S EN BP + 5 V RTN C1 0.01 F 1 kV C3 0.1 F 240 - 375 VDC R1 150 k 1 W U2 LTV817 D2 SB540 L1 10 H C4 2700 F 6.3 V C5 220 F 10 V VR1 1N5229B U1 TNY255P C2 4700 pF 1 kV T1 1 4 8 10 R2 68 D1 1N4937 Optional PI-2246-082898 DC IN 120 - 375 VDC TinySwitch D S EN BP + – + 7.5 V RTN C3 0.1 F R2 1 k VR1 1N5235B C1 0.01 F 1 kV R1 100 1/2 W C2 56 pF 1 kV D1 1N4934 L1 15 H C5 47 F 10 V C4 330 F 10 V U1 TNY253P T1 U2 SFH615-2 C6 680 pF Y1 Safety 1 4 8 10 Optional |
Similar Part No. - TNY253_V01 |
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Similar Description - TNY253_V01 |
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