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参数资料
| 型号： | TA8083AF |
| 元件分类： | 运动控制电子 |
| 英文描述： | BRUSH DC MOTOR CONTROLLER, 0.8 A, PDSO22 |
| 封装： | 0.450 INCH, 1 MM PITCH, PLASTIC, HSOP-20/22 |
| 文件页数： | 7/11页 |
| 文件大小： | 244K |
| 代理商： | TA8083AF |
TA8083AF
2005-03-28
5
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 protection 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 in the standby mode should be within one second.
ON
ISD or more
10
s
typ.
290
s typ.
ON
OFF
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