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Zakładka z wyszukiwarką danych komponentów |
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Zakładka z wyszukiwarką danych komponentów |
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MIC4607 Arkusz danych(PDF) 19 Page - Microchip Technology |
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MIC4607 Arkusz danych(HTML) 19 Page - Microchip Technology |
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19 / 42 page  2016 Microchip Technology Inc. DS20005610A-page 19 MIC4607 4.4 Overcurrent Timing Diagram The motor current is sensed in an external resistor that is connected between the low-side MOSFET’s source pins and ground. If the sense resistor voltage exceeds the rising overcurrent threshold (typically 0.2V), all LO and HO outputs are latched off and the FLT/ pin is pulled low. Once the outputs are latched off, an internal current source (typically 0.44 μA) begins to charge up the external CDLY capacitor. The outputs remain latched off and all xLI/xHI (or xPWM) input signals are ignored until the voltage on the CDLY capacitor rises above the VDLY+ threshold (typically 1.5V), which resets the latch on the first rising edge of any LI input of the MIC4607-1 (or falling edge on any PWM input for the MIC4607-2). Once this occurs, the CDLY capacitor is discharged, the FLT/ pin returns to a high impedance state and all out- puts will respond to their respective input signals. On startup, the current limit latch is reset during a rising VDD or a rising EN pin voltage to assure normal opera- tion. FIGURE 4-4: Overcurrent Timing Diagram. |
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