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TNY256Y Datasheet(PDF) 7 Page - Power Integrations, Inc. |
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TNY256Y Datasheet(HTML) 7 Page - Power Integrations, Inc. |
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7 / 20 page  C 7/01 TNY256 7 Figure 12. 5.5 W AC Adapter with Universal Input (85-265 VAC). through the TL431 voltage reference for proper regulation. Capacitor C11 bypasses the TL431 response for improved ripple performance. Resistor R5 determines the AC gain of the circuit. Key Application Considerations For the most up to date information visit our Web site at: www.powerint.com Design Output Power Table 1 shows the practical maximum continuous output power levels obtainable under following conditions: 1. The minimum DC input voltage is 90 V or higher for 85 VAC input or 240 V or higher for 230VAC input or 115 VAC input with a voltage doubler. This corresponds to a filter capacitor of 3 µF/W for universal input and 1 µF/W for 230 or 115 VAC w/doubler input. 2. A secondary output of 5 V with a Schottky rectifier diode. 3. The P and G packaged parts are board mounted with source pins soldered to sufficient area of copper and the Y packaged parts are heat sinked sufficiently to keep the die temperature at or below 100 °C. The maximum power capability of TinySwitch in a given application depends on the thermal environment (sealed enclosure, ventilated, open frame, etc.,), transformer core size and design (continuous or discontinuous), efficiency required, minimum specified input voltage, input storage capacitance, output voltage, output diode forward drop, etc., and can be different from the values shown in Table 1. Audible Noise At loads other than maximum load, the cycle skipping mode operation used in TinySwitch can generate audio frequency components in the transformer. This can cause the transformer to produce audio noise. Transformer audible noise can be reduced by using appropriate transformer construction techniques and decreasing the peak flux density. For more information on audio suppression techniques, please check the Application Notes section on our Web site at www.powerint.com. Ceramic capacitors that use dielectrics such as Z5U, when used in clamp and snubber circuits, can also generate audio noise due to electrostriction and piezo-electric effects. If this is the case, replacing them with a capacitor having a different type of dielectric is the simplest solution. Polyester film capacitors and ceramic capacitors with dielectrics such as NPO or X7R are good alternatives. PI-2502-040901 TinySwitch Plus D S EN/UV BP + 9 V 0.6 A RTN D1 1N4005 C1 10 µF 400 V Fusible RF1 10 Ω C4 0.1 µF 85-265 VAC L1 470 µH D2 1N4005 D3 1N4005 D4 1N4005 R3 330 k Ω 1/4 W U2 SFH615-2 D6 MBR360 L3 18 µH C6 330 µF 16 V C2 10 µF 400 V C8 220 µF 10 V R5 100 Ω R9 470 Ω U3 TL431CLP C5 2200 pF Y1 Safety U1 TNY256P C3 10 nF D5 1N4937 T1 R1 4.7 k Ω 1 4 8 10 R7 26.1 k Ω R8 10 k Ω C11 0.1 µF C7 330 µF 16 V 2 NC |
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