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L7987 bảng dữ liệu(PDF) 19 Page - STMicroelectronics

tên linh kiện L7987
Giải thích chi tiết về linh kiện  Adjustable current limitation
PDF  37 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
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L7987 bảng dữ liệu(HTML) 19 Page - STMicroelectronics

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DocID025589 Rev 3
19/37
L7987
Functional description
37
Figure 9. Current limit and programming resistor
The minimum programmed current limit can't be lower than ISKIP = 0.5 A (typical), also in
case of foldback detection.
4.6
Overtemperature protection
It is recommended that the device never exceeds the maximum allowable junction
temperature. This temperature increase is mainly caused by the total power dissipated from
the integrated Power MOSFET.
To avoid any damage to the device when reaching high temperature, the L7987 device
implements a thermal shutdown feature: when the junction temperature reaches 170 °C
(typ.) the device turns off the Power MOSFET and shuts down.
When the junction temperature drops to 155 °C (typ.), the device restarts with a new soft-
start sequence.



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