SC4601IMSTRT 查看數據表（PDF） - Semtech Corporation
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SC4601IMSTRT Datasheet PDF : 18 Pages
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SC4601
POWER MANAGEMENT
Typical Characteristic (Cont.)
Over current protection characteristic of SC4601 for 3.3V to1.5V @6A application:
The over current protection curve below is obtained by applying a gradually increased load while the load current
and the output voltage are monitored and measured. When the load current is increased from 0 to 9A (over current
trigger point), the output voltage is 1.5V, corresponding from Point A to Point B. As the load current increases
further from 9A to 9.6A, the output voltage drops significantly from 1.5V (Point B) to 0.54V (Point C). Because an
over current and a lower output voltage (0.54V < 68.75%*1.5V = 1.03V) are present at Point C, the SC4601
enters its HICCUP mode. Then the locus of the output current and the output voltage follows Line CD as shown in
the curve. Due to the over current applied, the HICCUP protection will go back and forth on Line CD. This prevents
excess power dissipation in the P-MOSFET during a short output condition.
Overcurrent protection
3
2.5
A
B
2
1.5
1
D
C
0.5
0
0
3
6
9
12
15
18
Output Current (A)
2006 Semtech Corp.
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