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UC2903 数据表(PDF) 7 Page - Texas Instruments |
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UC2903 数据表(HTML) 7 Page - Texas Instruments |
7 / 8 page UC1903 UC2903 UC3903 OPERATION AND APPLICATION INFORMATION (continued) UNITRODE CORPORATION 7 CONTINENTAL BLVD. • MERRIMACK, NH 03054 TEL. (603) 424-2410 • FAX (603) 424-3460 Start Latch and Supply Under-Voltage Sense Allow Predictable Power-Up The supply under-voltage sense and start-latch circuitry on the UC1903 prevents fault indications during start-up or low input supply (+VIN) conditions. When the input sup- ply voltage is below the supply under-voltage threshold the OV and UV fault outputs are disabled and the POWER OK output is active low. The POWER OK output will remain active until the input supply drops below ap- proximately 3.0V. With +VIN below this level, all of the open collector outputs will be off. When the input supply is low, the under-voltage sense cir- cuitry resets the start-latch. With the start-latch reset, the UV fault output will remain disabled until the input supply rises to its normal operating level (8-40V), and all of the sense inputs are above the under-voltage threshold. This allows slow starting, or supply sequencing, without an ar- tificial under-voltage fault indication. Once the latch is set, the UV fault output will respond if any of the sense inputs drop below the under-voltage threshold. Figure 8. The OV and UV comparators on the UC1903 trigger respective fault delay circuits when one or more of the sense inputs move outside the fault window. Input clamps insure proper operation under extreme fault conditions. Terminating the UV delay ca- pacitor to VREF assures correct logic at power up. 7 |
类似零件编号 - UC2903 |
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类似说明 - UC2903 |
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