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TPIC2603DW Datasheet(PDF) 10 Page - Texas Instruments |
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TPIC2603DW Datasheet(HTML) 10 Page - Texas Instruments |
10 / 17 page TPIC2603 6-CHANNEL SERIAL INTERFACE LOW-SIDE DRIVER SLIS056A – FEBRUARY 1995 – REVISED MARCH 1996 10 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 PRINCIPLES OF OPERATION open-load/short-to-ground sensing The TPIC2603 checks for open-load and short-to-ground conditions when the output is turned OFF. When the output turns OFF, a 40- µA current source switches onto the drain. Under normal conditions, the load provides adequate current to overcome the current source and the drain voltage remains above the open-load detection threshold. When the output is open, then the current source pulls the drain low and an open-load condition is flagged. The open-load test is enabled approximately 70 µs after the output turns OFF to allow the drain to stabilize. Figure 6 illustrates device operation under open-load conditions. t(stb) Glitches Control Register DRAIN Fault Register NORMAL t(stb) OPEN-LOAD Control Register DRAIN Fault Register Figure 6. Open-Load Condition over-voltage sensing and protection The TPIC2603 monitors the Vbat input terminal to protect the device and load from over-battery voltage conditions. The device disables all of the drain outputs when Vbat goes above 35 V. An over-battery voltage hysteresis is provided to prevent the outputs from transiting ON and OFF erratically near the over-voltage threshold. The device automatically returns to normal operation after the over-voltage condition has been corrected. Figure 7 illustrates device operation under an over-battery voltage condition. 34 V 35 V Vbat (Typ) All Drains Fault Bit Figure 7. Over-Battery Voltage Condition |
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