LT1578 查看數據表（PDF） - Linear Technology
零件编号
产品描述 (功能)
生产厂家
LT1578 Datasheet PDF : 28 Pages
| |||
LT1578/LT1578-2.5
TYPICAL PERFORMANCE CHARACTERISTICS
Shutdown Pin Bias Current
(VSHDN = Lockout Threshold)
4
AT 2.44V STANDBY THRESHOLD
(CURRENT FLOWS OUT OF PIN)
3
2
1
0
–50 –25 0 25 50 75 100 125
JUNCTION TEMPERATURE (°C)
1576 G04
Standby Thresholds
2.46
2.45
2.44
ON
2.43
STANDBY
2.42
2.41
2.40
–50 –25 0 25 50 75 100 125
JUNCTION TEMPERATURE (°C)
1576 G07
Error Amplifier Transconductance
2000
200
PHASE
1500
150
1000
GAIN
( ) 500 VFB 1 × 10–3
ROUT
570k
100
VC
COUT
2.4pF
50
0 ERROR AMPLIFIER EQUIVALENT CIRCUIT
0
RLOAD = 50Ω
–500
10
100
1k
10k
FREQUENCY (Hz)
–50
100k 1M
1576 G09
Shutdown Pin Bias Current
(VSHDN = Shutdown Threshold)
180
160
140
120
100
80
60
40 CURRENT REQUIRED TO FORCE
SHUTDOWN (FLOWS OUT OF PIN).
20 AFTER SHUTDOWN, CURRENT
DROPS TO A FEW µA
0
–50 –25 0 25 50 75 100 125
JUNCTION TEMPERATURE (°C)
1576 G05
Shutdown Supply Current
25
20
VSHDN = 0V
15
10
5
0
0
5
10
15
INPUT VOLTAGE (V)
1576 G08
Error Amplifier Transconductance
1600
1400
1200
1000
800
600
400
200
0
–50 –25 0 25 50 75 100 125
JUNCTION TEMPERATURE (°C)
1576 G11
Shutdown Thresholds
0.8
0.7
0.6
0.5
START-UP
0.4
SHUTDOWN
0.3
0.2
0.1
0
–50 –25 0 25 50 75 100 125
JUNCTION TEMPERATURE (°C)
1576 G06
Shutdown Supply Current
30
25
VIN = 10V
20
15
10
5
0
0
0.1
0.2
0.3
0.4
SHUTDOWN VOLTAGE (V)
1576 G010
Frequency Foldback
250
SWITCHING FREQUENCY
200
150
100
50
0
0
FEEDBACK PIN CURRENT
0.5
1.0
1.5
2.0
FEEDBACK VOLTAGE (V)
1576 G12
4
Share Link: 