LTC1539 Просмотр технического описания (PDF) - Linear Technology
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LTC1539 Datasheet PDF : 32 Pages
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LTC1538-AUX/LTC1539
TYPICAL PERFORMANCE CHARACTERISTICS
Normalized Oscillator Frequency
vs Temperature
10
RUN/SS Pin Current vs
Temperature
4
5
3
fO
2
–5
1
–10
– 40 –15
10 35 60 85
TEMPERATURE (°C)
110 135
1538/39 • G10
Maximum Current Comparator
Threshold Voltage vs Temp
154
0
– 40 –15
10 35 60 85
TEMPERATURE (°C)
110 135
1538/39 • G11
Transient Response
SFB1 Pin Current vs
Temperature
0
– 0.25
–1.50
– 0.75
–1.00
–1.25
–1.50
– 40 –15
10 35 60 85
TEMPERATURE (°C)
110 135
1538/39 • G12
Transient Response
152
VOUT
50mV/DIV
150
VOUT
50mV/DIV
148
146
– 40 –15
10 35 60 85
TEMPERATURE (°C)
110 135
1538/39 • G13
Burst Mode Operation
ILOAD = 50mA to 1A
1538/39 • G14
Soft Start: Load Current vs Time
VOUT
20mV/DIV
VOUT
200mV/DIV
ILOAD = 50mA
RUN/SS
5V/DIV
INDUCTOR
CURRENT
1A/DIV
1538/39 • G16
1538/39 • G17
ILOAD = 1A to 3A
1538/39 • G15
Auxiliary Regulator Load
Regulation
12.2
EXTERNAL PNP: 2N2907A
12.1
12.0
11.9
11.8
11.7
0
40
80 120 160 200
AUXILIARY LOAD CURRENT (mA)
1538/39 • G18
6
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