LT3680 Просмотр технического описания (PDF) - Linear Technology
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LT3680 Datasheet PDF : 24 Pages
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LT3680
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C unless otherwise noted.
Error Amp Output Current
50
40
30
20
10
0
–10
–20
–30
–40
–50
–200
–100
0
100
200
FB PIN ERROR VOLTAGE (mV)
3680 G19
Minimum Input Voltage
5.0
4.5
4.0
3.5
3.0
VOUT = 3.3V
2.5 TA = 25°C
L = 4.7μH
f = 800kHz
2.0
1
10
100
1000
LOAD CURRENT (mA)
10000
3680 G20
Minimum Input Voltage
6.5
6.0
5.5
5.0
VOUT = 5V
4.5 TA = 25 °C
L = 4.7μH
f = 800kHz
4.0
1
10
100
1000
LOAD CURRENT (mA)
10000
3680 G21
VC Voltages
2.50
Power Good Threshold
95
Switching Waveforms; Burst Mode
2.00
CURRENT LIMIT CLAMP
90
1.50
85
1.00
SWITCHING THRESHOLD
80
0.50
VSW
5V/DIV
IL
0.2A/DIV
VOUT
10mV/DIV
0
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
3680 G22
75
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
3680 G23
VIN = 12V
VOUT = 3.3V
ILOAD = 10mA
5μs/DIV
Switching Waveforms; Transition
from Burst Mode to Full Frequency
Switching Waveforms; Full
Frequency Continuous Operation
3680 G24
VSW
5V/DIV
VSW
5V/DIV
IL
0.2A/DIV
VOUT
10mV/DIV
VIN = 12V
VOUT = 3.3V
ILOAD = 110mA
1μs/DIV
3680 G25
IL
0.5A/DIV
VOUT
10mV/DIV
VIN = 12V
VOUT = 3.3V
ILOAD = 1A
1μs/DIV
3680 G26
3680fb
6
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