LT1507 Просмотр технического описания (PDF) - Linear Technology
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LT1507 Datasheet PDF : 20 Pages
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LT1507
TYPICAL PERFORMANCE CHARACTERISTICS
Shutdown Pin Bias Current
500
CURRENT REQUIRED TO FORCE SHUTDOWN
400 (FLOWS OUT OF PIN). AFTER SHUTDOWN,
CURRENT DROPS TO A FEW µA
300
200
8
AT 2.38V STANDBY THRESHOLD
(CURRENT FLOWS OUT OF PIN)
4
0
–50 –25 0 25 50 75
TEMPERATURE (°C)
100 125
L11507 • TPC04
Standby and Shutdown Thresholds
2.40
STANDBY
2.36
2.32
0.8
STARTUP
0.4
SHUTDOWN
0
–50 –25 0 25 50 75 100 125
JUNCTION TEMPERATURE (°C)
LT1507 • TPC05
Shutdown Supply Current
30
VSHDN = 0V
25
20
15
10
5
0
0
3
6
9
12
15
INPUT VOLTAGE (V)
LT1507 • TPC06
Shutdown Supply Current
150
125
100
75
50
VIN = 10V
25
0
0
0.1
0.2
0.3
0.4
0.5
SHUTDOWN VOLTAGE (V)
LT1507 • TPC07
Frequency Foldback
500
400
SWITCHING
FREQUENCY
300
200
100
0
0
FEEDBACK PIN
CURRENT
0.5 1.0 1.5 2.0 2.5
FEEDBACK PIN VOLTAGE (V)
LT1507 • TPC10
Error Amplifier Transconductance
2500
Error Amplifier Transconductance
3000
200
2000
PHASE
2500
150
1500
1000
GAIN
2000
100
1500 VFB × 2e–3
VC
ROUT
200k
COUT
12pF
50
500
0
–50 –25 0 25 50 75 100 125
JUNCTION TEMPERATURE (°C)
LT1507 • TPC08
Switching Frequency
600
1000 ERROR AMPLIFIER EQUIVALENT CIRCUIT
0
RLOAD = 50Ω
500
100
1k
10k 100k
FREQUENCY (Hz)
–50
1M 10M
LT1507 • TPC09
Minimum Input Voltage
with 3.3V Output
6.5
6.0
550
5.5
MINIMUM VOLTAGE
TO START WITH
STANDARD CIRCUIT
5.0
500
4.5
450
400
–50 –25 0 25 50 75 100 125
JUNCTION TEMPERATURE (°C)
LT1507 • TPC11
4.0
MINIMUM VOLTAGE
TO RUN WITH
3.5
STANDARD CIRCUIT
3.0
1
10
100
1000
LOAD CURRENT (mA)
LT1507 • TPC12
MINIMUM INPUT VOLTAGE CAN BE REDUCED
BY ADDING A SMALL EXTERNAL PNP. SEE
APPLICATIONS INFORMATION
4
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