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TNY264PN Datasheet(PDF) 5 Page - Power Integrations, Inc. |
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TNY264PN Datasheet(HTML) 5 Page - Power Integrations, Inc. |
5 / 22 page Rev. H 02/09 5 TNY263-268 www.powerint.com V DRAIN V EN CLOCK D DRAIN I MAX PI-2749-050301 Figure 6. TinySwitch-II Operation at Near Maximum Loading. V DRAIN V EN CLOCK D DRAIN I MAX PI-2667-090700 Figure 8. TinySwitch-II Operation at Medium Loading. PI-2377-091100 V DRAIN V EN CLOCK D DRAIN I MAX Figure 7. TinySwitch-II Operation at Moderately Heavy Loading. the appropriate current limit. At high loads, when the EN/UV pin is high (less than 240 μA out of the pin), a switching cycle with the full current limit occurs. At lighter loads, when EN/UV is high, a switching cycle with a reduced current limit occurs. At near maximum load, TinySwitch-II will conduct during nearly all of its clock cycles (Figure 6). At slightly lower load, it will “skip” additional cycles in order to maintain voltage regulation at the power supply output (Figure 7). At medium loads, cycles will be skipped and the current limit will be reduced (Figure 8). At very light loads, the current limit will be reduced even further (Figure 9). Only a small percentage of cycles will occur to satisfy the power consumption of the power supply. The response time of the TinySwitch-II ON/OFF control scheme is very fast compared to normal PWM control. This provides tight regulation and excellent transient response. Power Up/Down The TinySwitch-II requires only a 0.1 μF capacitor on the BYPASS pin. Because of its small size, the time to charge this capacitor is kept to an absolute minimum, typically 0.6 ms. Due to the fast nature of the ON/OFF feedback, there is no overshoot at the power supply output. When an external resistor (2 M Ω) is connected from the positive DC input to the EN/UV pin, the power MOSFET switching will be delayed during power-up until the DC line voltage exceeds the threshold (100 V). Figures 10 and 11 show the power-up timing waveform of TinySwitch-II in applications with and without an external resistor (2 M Ω) connected to the EN/UV pin. During power-down, when an external resistor is used, the power MOSFET will switch for 50 ms after the output loses regulation. The power MOSFET will then remain off without any glitches since the undervoltage function prohibits restart when the line voltage is low. Figure 12 illustrates a typical power-down timing waveform of TinySwitch-II. Figure 13 illustrates a very slow power-down timing waveform of TinySwitch-II as in standby applications. The external resistor (2 M Ω) is connected to the EN/UV pin in this case to prevent unwanted restarts. The TinySwitch-II does not require a bias winding to provide power to the chip, because it draws the power directly from the DRAIN pin (see Functional Description above). This has |
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