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TOP250 Datasheet(PDF) 41 Page - Power Integrations, Inc. |
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TOP250 Datasheet(HTML) 41 Page - Power Integrations, Inc. |
41 / 52 page TOP242-250 41 G 1/02 The following precautions should be followed when testing TOPSwitch-GX by itself outside of a power supply. The sche- matic shown in Figure 53 is suggested for laboratory testing of TOPSwitch-GX. When the DRAIN pin supply is turned on, the part will be in the auto-restart mode. The CONTROL pin voltage will be oscillating at a low frequency between 4.8 and 5.8 V and the drain is turned on every eighth cycle of the CONTROL pin oscillation. If the CONTROL pin power supply is turned on BENCH TEST PRECAUTIONS FOR EVALUATION OF ELECTRICAL CHARACTERISTICS Typical Performance Characteristics while in this auto-restart mode, there is only a 12.5% chance that the CONTROL pin oscillation will be in the correct state (drain active state) so that the continuous drain voltage wave- form may be observed. It is recommended that the V C power supply be turned on first and the DRAIN pin power supply second if continuous drain voltage waveforms are to be observed. The 12.5% chance of being in the correct state is due to the divide-by-8 counter. Temporarily shorting the CONTROL pin to the SOURCE pin will reset TOPSwitch-GX, which then will come up in the correct state. Figure 54. Current Limit vs. MULTI-FUNCTION Pin Current. Figure 55. Current Limit vs. External Current Limit Resistance. 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 60 40 80 100 120 140 160 180 200 -250 -200 -150 -100 -50 IM (µA) PI-2653-010802 0 Scaling Factors: TOP242: .45 TOP243 P/G: .75 TOP243 Y/R/F: .90 TOP244 P/G: 1 TOP244 Y/R/F: 1.35 TOP245: 1.80 TOP246: 2.70 TOP247: 3.60 TOP248: 4.50 TOP249: 5.40 TOP250: 6.32 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 60 40 80 100 120 140 160 180 200 05K 10K 15K 20K 25K 30K 35K 40K External Current Limit Resistor RIL (Ω) PI-2652-010802 45K Scaling Factors: TOP242: .45 TOP243 P/G: .75 TOP243 Y/R/F: .90 TOP244 P/G: 1 TOP244 Y/R/F: 1.35 TOP245: 1.80 TOP246: 2.70 TOP247: 3.60 TOP248: 4.50 TOP249: 5.40 TOP250: 6.32 Maximum and minimum levels are based on characterization. Minimum Typical Maximum |
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