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UC2825AQDWREP Datasheet(PDF) 9 Page - Texas Instruments |
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UC2825AQDWREP Datasheet(HTML) 9 Page - Texas Instruments |
9 / 21 page UDG−95106 1.2 V 5 V 1.2 V 0.2 V ON OFF FAULT VSS PWM UC2825A-EP www.ti.com SGLS305D – JULY 2005 – REVISED SEPTEMBER 2010 Undervoltage Lockout (UVLO), Soft-Start, and Fault Management Soft-start is programmed by a capacitor on the soft-start (SS) pin. At power up, SS is discharged. When SS is low, the error-amplifier output also is forced low. While the internal 9-mA source charges SS, the error-amplifier output follows until closed-loop regulation takes over. Anytime ILIM exceeds 1.2 V, the fault latch is set and the output pins are driven low. The soft-start cap then is discharged by a 250-mA current sink. No more output pulses are allowed until soft-start is fully discharged and ILIM is below 1.2 V. At this point, the fault latch resets and the chip executes a soft-start. Should the fault latch get set during soft-start, the outputs are terminated immediately, but the soft-start capacitor does not discharge until it has been fully charged first. This results in a controlled hiccup interval for continuous fault conditions. Figure 5. Soft-Start and Fault Waveforms Copyright © 2005–2010, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Link(s): UC2825A-EP |
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