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TPIC2603 Datasheet(PDF) 10 Page - Texas Instruments

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No. de Pieza. TPIC2603
Descripción  6-CHANNEL SERIAL INTERFACE LOW-SIDE DRIVER
Descarga  17 Pages
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Fabricante  TI [Texas Instruments]
Página de inicio  http://www.ti.com
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TPIC2603 Datasheet(HTML) 10 Page - Texas Instruments

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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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