TA8429H View Datasheet(PDF) - Toshiba
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TA8429H Datasheet PDF : 14 Pages
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TA8429H/HQ
Over-current Protection (ISD)
● Basic operation
When the output current (pin 4 or 8, that is, Isink or Isource) is equal to or lower than the ISD detection
current, the input signal controls the output. If the output current exceeds the detection current, it changes
to a switching waveform shown in Figure 1.
Detection current of 5 A
(typically)
Figure 1 Basic operation
● Explanation of the operation
The output current is detected by monitoring the VBE of each output transistor. A detector element is
connected to each output transistor and to a short-circuit prevention circuit. If a current higher than the ISD
detection current flows through one of the four output transistors, the short-circuit prevention circuit starts
operating. This circuit incorporates a timer. If the over-current mode lasts for 20 μs (typically), the output is
switched to the high-impedance state. It returns to the ON mode in 80 μs (typically). If the IC is still in the
over current mode, the switching mode stated above is repeated until the IC is released from the
over-current mode.
This circuit cannot limit all types of over current. If the outputs are short-circuited to each other or to a
ground, the IC may break down before the protection circuit starts operating. Therefore use a resistor or fuse
in the supply voltage (VS) line.
4
2010-02-23
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