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TNY288PG-TL Datasheet(PDF) 5 Page - Power Integrations, Inc. |
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TNY288PG-TL Datasheet(HTML) 5 Page - Power Integrations, Inc. |
5 / 26 page Rev. A 09/12 5 TNY284-290 www.powerint.com V DRAIN V EN CLOCK DC DRAIN I MAX PI-2749-082305 Figure 7. Operation at Near Maximum Loading. V DRAIN V EN CLOCK DC DRAIN I MAX PI-2667-082305 Figure 8. Operation at Moderately Heavy Loading. Figure 9. Operation at Medium Loading. PI-2377-082305 V DRAIN V EN CLOCK DC DRAIN I MAX PI-2661-082305 V DRAIN V EN CLOCK DC DRAIN I MAX Figure 10. Operation at Very Light Load. Enable Function TinySwitch-4 senses the ENABLE/UNDERVOLTAGE pin to determine whether or not to proceed with the next switching cycle. The sequence of cycles is used to determine the current limit. Once a cycle is started, it always completes the cycle (even when the ENABLE/UNDERVOLTAGE pin changes state half way through the cycle). This operation results in a power supply in which the output voltage ripple is determined by the output capacitor, amount of energy per switch cycle and the delay of the feedback. The ENABLE/UNDERVOLTAGE pin signal is generated on the secondary by comparing the power supply output voltage with a reference voltage. The ENABLE/UNDERVOLTAGE pin signal is high when the power supply output voltage is less than the reference voltage. In a typical implementation, the ENABLE/ UNDERVOLTAGE pin is driven by an optocoupler. The collector of the optocoupler transistor is connected to the ENABLE/ UNDERVOLTAGE pin and the emitter is connected to the SOURCE pin. The optocoupler LED is connected in series with |
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