LT1576CS8-SYNC 查看數據表（PDF） - Linear Technology
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LT1576CS8-SYNC Datasheet PDF : 28 Pages
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LT1576/LT1576-5
TYPICAL PERFORMANCE CHARACTERISTICS
Switch Drop
0.5
0.4
0.3
0.2
125°C
25°C
–20°C
0.1
0
0 0.25 0.50 0.75 1.00 1.25 1.50
SWITCH CURRENT (A)
1576 G01
Shutdown Pin Bias Current
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
Switch Peak Current Limit
2.5
TYPICAL
2.0
MINIMUM
1.5
1.0
0.5
Feedback Pin Voltage
1.23
1.22
1.21
1.20
0
0
20
40
60
80 100
DUTY CYCLE (%)
1576 G02
1.19
–50 –25 0 25 50 75 100 125
JUNCTION TEMPERATURE (°C)
1576 G03
Shutdown Pin Bias Current
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 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
25
VSHDN = 0V
20
Error Amplifier Transconductance
2000
200
PHASE
1500
150
GAIN
15
1000
100
VC
10
( ) 500 VFB 1 × 10–3
ROUT
570k
COUT
2.4pF
50
5
0 ERROR AMPLIFIER EQUIVALENT CIRCUIT
0
RLOAD = 50Ω
0
–500
–50
0
5
10
15
20
25
10
100
1k
10k 100k 1M
INPUT VOLTAGE (V)
FREQUENCY (Hz)
1576 G08
1576 G09
4
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