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TNY253G Datasheet(PDF) 5 Page - Power Integrations, Inc. |
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TNY253G Datasheet(HTML) 5 Page - Power Integrations, Inc. |
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5 / 20 page  C 7/01 TNY253/254/255 5 Figure 6. TinySwitch Operation at Light Load. Figure 7. TinySwitch Power-Up Timing Diagram. Figure 8. TinySwitch Power Down Timing Diagram. PI-2261-061198 V DRAIN V EN CLOCK DC DRAIN I MAX 130 kHz Switching Frequency (TNY255) The switching frequency (with no cycle skipping) is set at 130kHz. This allows the TNY255 to deliver 10W while still using the same size, low cost transformer (EE16) as used by the TNY253/254 for lower power applications. BYPASS Pin Capacitor The BYPASS pin uses a small 0.1 µF ceramic capacitor for decoupling the internal power supply of the TinySwitch. Application Examples Television Standby TinySwitch is an ideal solution for low cost, high efficiency standby power supplies used in consumer electronic products such as TVs. Figure9 shows a 7.5 V, 1.3 W flyback circuit that uses TNY253 for implementing a TV standby supply. The circuit operates from the DC high voltage already available from the main power supply. This input voltage can range from 120 to 375VDC depending on the input AC voltage range that the TV is rated for. 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 TV standby circuit. The high voltage DC bus is applied to the series combination of the primary winding of T1 and the integrated high voltage MOSFET inside the TNY253. The low operating frequency of the TNY253 (44kHz), allows a low cost snubber circuit C2 and R1 to be used in place of a primary clamp circuit. In addition to limiting the DRAIN turn off voltage spike to a safe value, the RC snubber also reduces radiated video noise by lowering the dv/dt of the DRAIN waveform, which is critical for video applications such as TV and VCR. On fixed frequency PWM and RCC circuits, use of a snubber will result in an undesirable fixed AC switching loss that is independent of load. The ON/OFF control on the TinySwitch eliminates this problem by scaling the effective switching frequency and therefore, switching loss linearly with load. Thus the efficiency of the supply stays relatively constant down to a fraction of a watt of output loading. The secondary winding is rectified and filtered by D1 and C4 to create the 7.5V output. L1 and C5 provide additional filtering. 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 the Zener to improve its voltage tolerance. V DRAIN V IN 0.2 Time (ms) .4 .6 .8 1 0 V 0 V V DRAIN V IN 12 V 12 V 0 100 Time (ms) 200 300 400 500 0 V 0 V |
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