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MCP1630TEMS Datasheet(PDF) 11 Page - Microchip Technology |
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MCP1630TEMS Datasheet(HTML) 11 Page - Microchip Technology |
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11 / 18 page  2004 Microchip Technology Inc. DS21896A-page 11 MCP1630 4.7 Overtemperature Protection To protect the VEXT output if shorted to VIN or GND, the MCP1630 VEXT output will be high-impedance if the junction temperature is above the thermal shutdown threshold. There is an internal 100 k Ω pull-down resis- tor connected from VEXT to ground to provide some pull-down during overtemperature conditions. The protection is set to 150°C typical with a hysteresis of 18°C. FIGURE 4-1: Cycle-by-Cycle Timing Diagram OSC IN S COMP Q MCP1630 High-Speed PWM Timing Diagram CS R VDRIVE VEXT R S Q Q EA + - VREF FB Comp + - CS OSC IN VIN COMP GND VEXT 2R R VIN 2.7V Clamp Overtemperature UVLO 100 k Ω 0.1 µA 0.1 µA VIN VIN Latch Truth Table SR Q 00 Qn 011 100 111 Note: During overtemperature, VEXT driver is high-impedance. Note |
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