LT1956-5 Просмотр технического описания (PDF) - Linear Technology
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LT1956-5 Datasheet PDF : 28 Pages
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LT1956/LT1956-5
TYPICAL PERFOR A CE CHARACTERISTICS
Switch Peak Current Limit
2.5
FB Pin Voltage and Current
1.234
2.0
TYPICAL
2.0
GUARANTEED MINIMUM
1.5
1.229
1.224
1.219
1.214
1.209
1.5
VOLTAGE
1.0
CURRENT
0.5
1.0
0
20
40
60
80 100
DUTY CYCLE (%)
1956 G01
1.204
0
–50 –25 0 25 50 75 100 125
JUNCTION TEMPERATURE (°C)
1956 G02
Lockout and Shutdown
Thresholds
2.4
LOCKOUT
2.0
1.6
1.2
0.8
START-UP
0.4
SHUTDOWN
0
–50 –25 0 25 50 75 100 125
JUNCTION TEMPERATURE (°C)
1956 G04
Shutdown Supply Current
40
VSHDN = 0V
35
30
25
20
15
10
5
0
0 10 20 30 40 50 60
INPUT VOLTAGE (V)
1956 G05
Error Amplifier Transconductance
2500
2000
1500
1000
Error Amplifier Transconductance
3000
200
PHASE
2500
150
2000
GAIN
( ) 1500 VFB 2 • 10–3
ROUT
200k
100
VC
COUT
12pF
50
500
0
–50
–25 0 25 50 75 100 125
JUNCTION TEMPERATURE
1956 G07
1000 ERROR AMPLIFIER EQUIVALENT CIRCUIT
0
RLOAD = 50Ω
500
100
1k
10k 100k
FREQUENCY (Hz)
–50
1M 10M
1956 G08
SHDN Pin Bias Current
250
CURRENT REQUIRED TO FORCE SHUTDOWN
200 (FLOWS OUT OF PIN). AFTER SHUTDOWN,
CURRENT DROPS TO A FEW µA
150
100
12
AT 2.38V STANDBY THRESHOLD
(CURRENT FLOWS OUT OF PIN)
6
0
–50 –25 0 25 50 75 100 125
JUNCTION TEMPERATURE (°C)
1956 G03
Shutdown Supply Current
300
250
VIN = 60V
200
VIN = 15V
150
100
50
0
0
0.1
0.2
0.3
0.4
0.5
SHUTDOWN VOLTAGE (V)
1956 G06
Frequency Foldback
625
SWITCHING
FREQUENCY
500
375
250
125
0
0
FB PIN
CURRENT
0.2 0.4 0.6 0.8 1.0 1.2
VFB (V)
1956 G09
1956f
4
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