1766 Просмотр технического описания (PDF) - Linear Technology
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1766 Datasheet PDF : 30 Pages
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LT1766/LT1766-5
TYPICAL PERFORMANCE CHARACTERISTICS
Switch Peak Current Limit
2.5 TA = 25°C
TYPICAL
2.0
GUARANTEED MINIMUM
1.5
FB Pin Voltage and Current
1.234
2.0
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
DUTY CYCLE (%)
1.204
0
100
–50 –25 0 25 50 75 100 125 150
JUNCTION TEMPERATURE (°C)
1766 G01
1766 G02
Lockout and Shutdown
Thresholds
2.4
LOCKOUT
2.0
1.6
Shutdown Supply Current
40
VSHDN = 0V
35 TA = 25°C
30
25
1.2
20
0.8
START-UP
0.4
SHUTDOWN
0
–50 –25 0 25 50 75 100 125 150
JUNCTION TEMPERATURE (°C)
1766 G04
15
10
5
0
0 10 20 30 40 50 60
INPUT VOLTAGE (V)
1766 G05
Error Amplifier Transconductance
2500
2000
Error Amplifier Transconductance
3000 TA = 25°C
200
PHASE
2500
150
1500
1000
2000
GAIN
( ) 1500 VFB 2 • 10–3
ROUT
200k
100
VC
COUT
12pF
50
500
1000 ERROR AMPLIFIER EQUIVALENT CIRCUIT
0
0
–50 –25 0 25 50 75 100 125 150
JUNCTION TEMPERATURE (°C)
1766 G07
RLOAD = 50Ω
500
100
1k
10k
100k
FREQUENCY (Hz)
–50
1M 10M
1766 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 75 100 125 150
JUNCTION TEMPERATURE (°C)
1766 G03
Shutdown Supply Current
300 TA = 25°C
250
VIN = 60V
200
VIN = 15V
150
100
50
0
0
0.1
0.2
0.3
0.4
0.5
SHUTDOWN VOLTAGE (V)
1766 G06
Frequency Foldback
600 TA = 25°C
500
400
300
SWITCHING
FREQUENCY
200
100
0
0
FB PIN
CURRENT
0.5
1.0
VFB (V)
1.5
1766 G09
1766fc
6
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