SC4524D 查看數據表（PDF） - Semtech Corporation
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SC4524D Datasheet PDF : 21 Pages
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(2)
Curve 3
SC4524D
Typical Characteristics
SC4524A/B
SC4524A/B
SS270 REV 6-7
SS270 REV 6-7
Efficie ncy
90
85
VO=5V
VO=3.3V
80
VO=2.5V
75
70
VO=1.5V
65
60
Efficie ncy
90
85
V O=3.3V
80
V O=2.5V
Feedback Voltage vs Temperature
1.02
VIN =12V
1.01
75
V O=1.5V
70
1.00
65
VO=1.0V
60
0.99
55
Curve 51MHz, VIN =12V
50
D2 =20BQ030
45
55
Curve 6 50
1MHz, VIN=5V
D2 =20BQ030
0.98
45
40
40
0.97
0
0.5
1
1.5
2
0
0.5
1
1.5
2
-50 -25 0 25 50 75 100 125
Load Current (A)
Load Current (A)
Te mperature (oC)
SS270 REV 6-7
SS270 REV 6-7
Frequency Setting Resistor
vs Frequency
1000
Frequency vs Temperature
1.2
Foldback Frequency vs VFB
1.25
VIN=12V
100
1.1
ROSC=73.2k
1
ROSC=73.2k
0.75
1.0
10
Curve 8
ROSC=12.1k
0.9
Curve 9
0.5
0.25
ROSC=12.1k
TA=25oC
1
0 0.25 0.5 0.75 1 1.25 1.5 1.75 2
Frequency (MHz)
0.8
-50 -25
0 25 50 75 100 125
Temperature (OC)
0
0.00 0.20 0.40 0.60 0.80 1.00
VFB (V)
SS270 REV 6-7
SS270 REV 6-7
SS270 REV 6-7
Switch Saturation Voltage
vs Switch Current
300
250
125oC
Switch Current Limit vs Temperature
4.5
4.0
BST Pin Current vs Switch Current
100.0
75.0
VIN =12V
VBST =15V
200
25oC
-40oC
3.5
150
3.0
100
50.0
25.0
-40oC
125oC
50
0.0 0.5 1.0 1.5 2.0 2.5
Switch Current (A)
2.5
-50 -25 0 25 50 75 100 125
Temperature (OC)
0.0
0 0.5 1 1.5 2 2.5 3
Switch Current (A)
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