SC4525ASETRT 查看數據表（PDF） - Semtech Corporation
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SC4525ASETRT Datasheet PDF : 19 Pages
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(2) 24Vin Eff
(3)
SC4525A
Typical Characteristics
SC4525A
SC4525A
SS270 REV 6-7
Efficiency
90
85
VO=5V
80
VO=3.3V
75
VO=2.5V
70
65
V O=1.5V
60
55
5(05)
45
VIN=12V
1MHz
40
0 0.5 1 1.5 2 2.5 3
Load Current (A)
Efficie ncy
90
85
V O=5V
80
75
V O=3.3V
70
V O=2.5V
65
60
55
5(0 6)
45
VIN=24V
1MHz
40
0 0.5 1 1.5 2 2.5 3
Load Current (A)
SS270 REV 6-7
SS270 REV 6-7
Feedback Voltage vs Temperature
1.02
VIN =12V
1.01
1.00
0.99
0.98
0.97
-50 -25 0 25 50 75 100 125
Tempe rature (oC)
1000
Frequency Setting Resistor
vs Frequency
VIN =12V
100
Frequency vs Temperature
1.2
ROSC=93.1k
1.1
1.0
10
(8) OCP current
ROSC=12.1k
0.9 (9) BST Pin current
1
0
SS270 REV 6-7
0.5
1
1.5
2
2.5
Frequency (MHz)
0.8
-50 -25
0 25 50 75 100 125
Temperature (oC)
SS270 REV 6-7
Foldback Frequency vs VFB
1.25
1
0.75
ROSC=93.1k
0.5
0.25
TA =25oC
ROSC=12.1k
0
0.0 0.2 0.4 0.6 0.8 1.0
VFB (V)
Switch Saturation Voltage
vs Switch Current
500
450
400
125oC
350
300
250
-40oC
200
150
25oC
100
50
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
Switch Current (A)
Switch Current Limit vs Temperature
5.0
4.8
4.6
4.4
4.2
BST Pin Current vs Switch Current
100.0
VIN =12V
VBST-SW =5V
75.0
50.0
25.0
-40oC
125oC
4.0
-50 -25
0 25 50 75 100 125
Temperature (oC)
0.0
0 0.5 1 1.5 2 2.5 3 3.5 4
Switch Current (A)
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