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TPIC2603DW 데이터시트(PDF) 11 Page - Texas Instruments

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부품명 TPIC2603DW
상세설명  6-CHANNEL SERIAL INTERFACE LOW-SIDE DRIVER
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TPIC2603
6-CHANNEL SERIAL INTERFACE LOW-SIDE DRIVER
SLIS056A – FEBRUARY 1995 – REVISED MARCH 1996
11
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
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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