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参数资料
| 型号： | TB6674PG |
| 元件分类： | 运动控制电子 |
| 英文描述： | STEPPER MOTOR CONTROLLER, 0.4 A, PDIP16 |
| 封装： | 0.300 INCH, 2.54 MM PITCH, PLASTIC, DIP-16 |
| 文件页数： | 20/21页 |
| 文件大小： | 514K |
| 代理商： | TB6674PG |
TB6674PG/FG/FAG
Ver.3
2010-07-07
8
Over Current Protection (ISD) Circuit
The IC incorporates the over current protection circuit that monitors the current flowing through each
output power transistor. If a current, which is out of the detecting current, is sensed at any one of these
transistors, all output transistors are turned off (Hi-Z). (However, ISD is not incorporated in upper
PchDMOS when PS is high level (Vs2A is 5 V usage) because ON resistance is large.
Masking time is 20 μs. The operation does not recover automatically (latch method). There are two
recovery methods written below.
(1) Power monitor turns on when any of the power supply decreases and reaches the specified voltage.
(2) Vs2B is set low level for 20 μs or more and then set high. The operation recovers in 10 μs.
Reference design target of detecting current is as follows;
PS = L, VS1A (12 V) :PchDMOS = 1.1 A
PS = H/PS = L in common :Lower NchDMOS = 1.4 A
Please reduce the external noise to prevent malfunction for ISD.
ISD internal signal
H
L
Normal operation
OFF（Hi-Z）
<ISD operation>
ISD detecting value
0
20 μs
(Design target)
Output current
OFF time
UVLO (Power monitor)
Power monitoring: OFF
Power monitoring: ON
Output terminal
Vs2B
20 μs
10 μs
(Design target)
Operation recovers by
one of two cases.
Power monitoring: ON
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