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TNY278PN Datasheet(PDF) 5 Page - Power Integrations, Inc. |
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TNY278PN Datasheet(HTML) 5 Page - Power Integrations, Inc. |
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5 / 24 page  5 TNY274-280 E 2/06 V DRAIN V EN CLOCK DC DRAIN I MAX PI-2749-082305 Figure 6. Operation at Near Maximum Loading. V DRAIN V EN CLOCK DC DRAIN I MAX PI-2667-082305 Figure 8. Operation at Medium Loading. Figure 7. Operation at Moderately Heavy Loading. loadisproportionaltotheprimaryinductanceofthetransformer and peak primary current squared. Hence, designing the supply involves calculating the primary inductance of the transformer for the maximum output power required. If the TinySwitch-III is appropriately chosen for the power level, the current in the calculated inductance will ramp up to current limit before the DC MAX limit is reached. Enable Function TinySwitch-III senses the EN/UV 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 EN/UV 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 EN/UV pin signal is generated on the secondary by comparing the power supply output voltage with a reference voltage. The EN/UV pin signal is high when the power supply output voltage is less than the reference voltage. In a typical implementation, the EN/UV pin is driven by an optocoupler. The collector of the optocoupler transistor is connected to the EN/UV pin and the emitter is connected to the SOURCE pin. The optocoupler LED is connected in series withaZenerdiodeacross theDC outputvoltagetoberegulated. When the output voltage exceeds the target regulation voltage level (optocoupler LED voltage drop plus Zener voltage), the optocoupler LED will start to conduct, pulling the EN/UV pin low. The Zener diode can be replaced by a TL431 reference circuit for improved accuracy. ON/OFF Operation with Current Limit State Machine The internal clock of the TinySwitch-III runs all the time. At the beginning of each clock cycle, it samples the EN/UV pin to decide whether or not to implement a switch cycle, and based on the sequence of samples over multiple cycles, it determines the appropriate current limit. At high loads, the state machine sets the current limit to its highest value. At lighter loads, the state machine sets the current limit to reduced values. PI-2377-082305 V DRAIN V EN CLOCK DC DRAIN I MAX |
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