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TNY290PG-TL Datasheet(PDF) 6 Page - Power Integrations, Inc. |
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TNY290PG-TL Datasheet(HTML) 6 Page - Power Integrations, Inc. |
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6 / 26 page  Rev. A 09/12 6 TNY284-290 www.powerint.com Figure 13. Normal Power-Down Timing (without UV). Figure 14. Slow Power-Down Timing with Optional External (4 M W) UV Resistor Connected to EN/UV Pin. Figure 11. Power-Up with Optional External UV Resistor (4 M W) Connected to EN/UV Pin. Figure 12. Power-Up without Optional External UV Resistor Connected to EN/UV Pin. 0 2.5 5 Time (s) 0 100 200 400 300 0 100 200 V DC-INPUT V DRAIN 0 12 Time (ms) 0 200 400 5 0 10 0 100 200 V DC-INPUT V BYPASS V DRAIN 0 12 Time (ms) 0 200 400 5 0 10 0 100 200 V DC-INPUT V BYPASS V DRAIN 0 .5 1 Time (s) 0 100 200 300 0 100 200 400 V DC-INPUT V DRAIN a Zener diode across the DC output voltage to be regulated. 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 ENABLE/ UNDERVOLTAGE 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-4 runs all the time. At the beginning of each clock cycle, it samples the ENABLE/ UNDERVOLTAGE 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. At near maximum load, TinySwitch-4 will conduct during nearly all of its clock cycles (Figure 7). At slightly lower load, it will “skip” additional cycles in order to maintain voltage regulation at the power supply output (Figure 8). At medium loads, cycles will be skipped and the current limit will be reduced (Figure 9). At very light loads, the current limit will be reduced even further (Figure 10). Only a small percentage of cycles will occur to satisfy the power consumption of the power supply. The response time of the ON/OFF control scheme is very fast compared to PWM control. This provides tight regulation and excellent transient response. Power-Up/Down The TinySwitch-4 requires only a 0.1 μF capacitor on the BYPASS/MULTI-FUNCTION pin to operate with standard |
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