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TPIC2603DWR Datasheet(PDF) 11 Page - Texas Instruments |
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TPIC2603DWR Datasheet(HTML) 11 Page - Texas Instruments |
11 / 19 page TPIC2603 6CHANNEL SERIAL INTERFACE LOW SIDE DRIVER SLIS056A − FEBRUARY 1995 − REVISED MARCH 1996 11 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443 PRINCIPLES OF OPERATION over-temperature sensing The TPIC2603 monitors the junction temperature of the die to detect over-temperature conditions which may damage the device. When the junction temperature goes above approximately 170 °C, the fault logic sets the global over-temperature fault bit. An over-temperature fault is reported using the serial interface on bit 6 (for 8-bit configuration) or bit 14 (for 16-bit configuration). The global over-temperature fault output in the serial data is exclusively ORed with the second bit (bit 6 for 8-bit configuration or bit 14 for 16-bit configuration) of data input to the SDI terminal. Bit 6 or bit 14 of the input data should be set low. Over-temperature faults are for informational purposes only and do not affect the state of the drains. Figure 8 illustrates device operation under over-temperature conditions. 160 °C 170 °C Junction Temperature Drains (Not Disabled) Fault Bit Figure 8. Over-Temperature Sense PARAMETER MEASUREMENT INFORMATION OUTPUT CURRENT vs TIME FOR INCREASING LOAD RESISTANCE Region 1 Region 2 t1 t2 First output current pulses after turn-on in chopping mode with resistive load. 0 3 0 t1 ≈ 55 µs t2 ≈ 3.5 ms t -Time t - Time REGION 1 CURRENT WAVEFORM IL t2 t1 t1 2 1 Region 3 TC = 25°C NOTES: A. Region 1 − Analog current limit holds the maximum current while the device runs in chop mode. B. Region 2 − Analog current limit is removed but device continues in chop mode. C. Region 3 − Current is below chop mode sense; therefore, it is in normal operation. Variable load is resistance over time. Figure 9. Chopping-Mode Characteristics |
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