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UC3877QP Datasheet(PDF) 10 Page - Texas Instruments |
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UC3877QP Datasheet(HTML) 10 Page - Texas Instruments |
10 / 19 page 10 UC1875/6/7/8 UC2875/6/7/8 UC3875/6/7/8 The fault control circuitry provides two forms of power shutdown: • Complete turn-off of all four output power stages. • Clamping the phase shift command to zero. Complete turn-off is ordered for an over-current fault or a low supply voltage. When the SOFTSTART pin reaches its low threshold, switching is allowed to pro- ceed while the phase-shift is advanced from zero to its nominal value with the time constant of the SOFT-START capacitor. The fault logic insures that a continuous fault will insti- tute a low frequency “hiccup” retry cycle by forcing the SOFT-START capacitor to charge through its full cycle between each restart attempt. APPLICATION INFORMATION (cont.) Fault/Soft-Start UDG-95085 UDG-95084 |
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