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LT1956IGN データシート(PDF) 4 Page - Linear Technology

部品番号 LT1956IGN
部品情報  High Voltage, 1.5A, 500kHz Step-Down
PDF  28 Pages
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メーカー  LINER [Linear Technology]
ホームページ  http://www.linear.com
Logo LINER - Linear Technology

LT1956IGN データシート(HTML) 4 Page - Linear Technology

  LT1956IGN Datasheet HTML 1Page - Linear Technology LT1956IGN Datasheet HTML 2Page - Linear Technology LT1956IGN Datasheet HTML 3Page - Linear Technology LT1956IGN Datasheet HTML 4Page - Linear Technology LT1956IGN Datasheet HTML 5Page - Linear Technology LT1956IGN Datasheet HTML 6Page - Linear Technology LT1956IGN Datasheet HTML 7Page - Linear Technology LT1956IGN Datasheet HTML 8Page - Linear Technology LT1956IGN Datasheet HTML 9Page - Linear Technology Next Button
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4
LT1956/LT1956-5
1956f
Switch Peak Current Limit
SHDN Pin Bias Current
Shutdown Supply Current
Lockout and Shutdown
Thresholds
Shutdown Supply Current
Error Amplifier Transconductance
FB Pin Voltage and Current
Error Amplifier Transconductance
Frequency Foldback
TYPICAL PERFOR A CE CHARACTERISTICS
DUTY CYCLE (%)
1.0
1.5
2.0
2.5
20
40
TYPICAL
60
80
1956 G01
100
0
GUARANTEED MINIMUM
JUNCTION TEMPERATURE (
°C)
–50
1.224
1.229
1.234
25
75
1956 G02
1.219
1.214
–25
0
50
100
125
1.209
1.204
1.5
2.0
1.0
0.5
0
VOLTAGE
CURRENT
JUNCTION TEMPERATURE (
°C)
–50
250
200
150
100
12
6
0
25
75
1956 G03
–25
0
50
100
125
CURRENT REQUIRED TO FORCE SHUTDOWN
(FLOWS OUT OF PIN). AFTER SHUTDOWN,
CURRENT DROPS TO A FEW
µA
AT 2.38V STANDBY THRESHOLD
(CURRENT FLOWS OUT OF PIN)
JUNCTION TEMPERATURE (
°C)
–50
50
100
1956 G04
0
25
75
2.4
2.0
1.6
1.2
0.8
0.4
0
–25
125
LOCKOUT
START-UP
SHUTDOWN
INPUT VOLTAGE (V)
0
1956 G05
10
20
30
40
50
60
40
35
30
25
20
15
10
5
0
VSHDN = 0V
SHUTDOWN VOLTAGE (V)
0
0
50
100
150
200
250
300
0.1
0.2
0.3
0.4
1956 G06
0.5
VIN = 60V
VIN = 15V
JUNCTION TEMPERATURE
1956 G07
2500
2000
1500
1000
500
0
–50
50
100
0
25
75
–25
125
FREQUENCY (Hz)
3000
2500
2000
1500
1000
500
200
150
100
50
0
–50
100
10k
100k
10M
1956 G08
1k
1M
GAIN
PHASE
ERROR AMPLIFIER EQUIVALENT CIRCUIT
ROUT
200k
COUT
12pF
VC
RLOAD = 50Ω
VFB 2 • 10
–3
)
(
VFB (V)
0
0.2
375
500
625
1.0
1956 G09
250
125
0
0.4
0.6
0.8
1.2
SWITCHING
FREQUENCY
FB PIN
CURRENT



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