LT1533 查看數據表（PDF） - Linear Technology
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LT1533 Datasheet PDF : 20 Pages
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LT1533
TYPICAL PERFORMANCE CHARACTERISTICS
Minimum Input Voltage vs
Temperature
2.70
2.65
2.60
2.55
2.50
2.45
–50 –25 0 25 50 75 100 125 150
JUNCTION TEMPERATURE (°C)
1533 G01
Feedback Voltage and Input
Current vs Temperature
1.30
2.0
1.29
1.8
1.28
1.6
1.27
1.4
1.26
1.2
VFB
1.25
1.0
1.24
0.8
1.23
0.6
IFB
1.22
0.4
1.21
0.2
1.20
0
–50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
1533 G04
Switching Frequency vs
Feedback Pin Voltage
120
100
80
60
40
20
0
0 0.1 0.2 0.3 0.4 0.5 0.6
FEEDBACK PIN VOLTAGE (V)
1533 G07
Change in ILIM vs DC
0
–50
–100
–150
25°C
125°C
–200
–250
–300
0
10
20
30
40
50
DUTY CYCLE (%)
1533 G02
Negative Feedback Voltage and
Input Current vs Temperature
–2.30
35
–2.35
–2.40
–2.45
30
VNFB
–2.50
25
–2.55
–2.60
–2.65
20
INFB
–2.70
–50 –25
15
0 25 50 75 100 125 150
TEMPERATURE (°C)
1533 G05
Error Amplifier Output Current
500
400
–40°C
300
125°C
200
25°C
100
0
–100
–200
–300
–400
–500
–400 –300 –200 –100 0 100 200 300 400
FEEDBACK PIN VOLTAGE FROM NOMINAL (mV)
1533 G08
Switch Voltage Drop
0.7
0.6
125°C
0.5
0.4
85°C
25°C
0.3
0.2
0.1
0
0
0.2
0.4
0.6
0.8
1.0
SWITCH CURRENT (A)
1533 G03
Error Amplifier Transconductance
vs Temperature
2000
1900 gm = ∆IVC/∆VFB
1800
1700
1600
1500
1400
1300
1200
1100
1000
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
1533 G06
VC Pin Threshold and Clamp
Voltage vs Temperature
1.6
1.4
1.2
VC PIN CLAMP
VOLTAGE
1.0
0.8
0.6
0.4
VC PIN
THRESHOLD
0.2
0
–50 –25
0 25 50 75 100 125
TEMPERATURE (°C)
1533 G09
4
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