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参数资料
| 型号： | TA8083F |
| 元件分类： | 运动控制电子 |
| 英文描述： | BRUSH DC MOTOR CONTROLLER, PDSO22 |
| 封装： | 0.450 INCH, 1 MM PITCH, HEAT SINK, PLASTIC, SOP-20/22 |
| 文件页数： | 11/14页 |
| 文件大小： | 253K |
| 代理商： | TA8083F |
TA8083P/F
2004-12-24
6
3. Overcurrent detection (ISD)
Basic operation
When the output current (M (+) or M (), Isink or Isource) is up to the ISD detection current, the output is
controlled by the input signals. When it exceeds the detection current, the output assumes a switching
waveform as shown in Figure 1.
Figure 1: Basic operation
Detailed explanation
The output current is detected by monitoring the sense resistance. One detection circuit connects to one of
the circuits (CH1 or CH2) and leads to the short-circuit detection circuit. When a current exceeding the ISD
detection current flows through one of the four output transistors, the short-circuit detection circuit is
activated. This circuit contains a timer. When an overcurrent condition continues for 10 s (typically), the
detection circuit places the output in high-impedance mode and, 290 s (typically) later, returns the IC to
ON mode. The switching-waveform output is repeated until the overcurrent condition is no longer present.
Caution for application
The overcurrent detection is intended to protect the IC temporarily from overcurrent conditions due to
short circuits. If an overcurrent condition continues after the output transistors move to switching mode,
damage can occur due to overstress. To prevent this, a system must be configured so that the IC is switched
into standby mode immediately after an overcurrent condition is detected by the DIAG output. In this case,
the time that it takes to detect an overcurrent fault caused by short circuit to output (or to supply or
ground) and to place the IC to the standby mode should be within one second.
ON
1A or more
10
s typ.
290
s typ.
ON
OFF
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