Linear Technology LT3480, Руководство пользователя

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LT3480
5
3480fb
TYPICAL PERFORMANCE CHARACTERISTICS
SWITCH CURRENT (mA)
0
400
500
700
1500
3480 G10
300
200
500 1000 2000 2500
100
0
600
VOL
TAGE DROP (mV)
SWITCH CURRENT (mA)
0
BOOST PIN CURRENT (mA)
10
30
40
50
80
3480 G11
20
60
70
0 1500 500 1000 2000 2500
TEMPERATURE (°C)
FEEDBACK VOL
TAGE (mV)
800
4380 G12
760
840
780
820
–50 25 –25 0 50 75 100 150 125
TEMPERATURE (°C)
FREQUENCY (MHz)
1.00
1.10
4380 G13
0.90
0.80
1.20
0.95
1.05
0.85
1.15
–50 25 –25 0 50 75 100 150 125
FB PIN VOLTAGE (mV)
0
SWITCHING FREQUENCY (kHz)
800
1000
1200
600
3480 G14
600
400
200 400
800
500 100 300
700 900
200
0
TEMPERATURE (˚C)
MINIMUM SWITCH ON TIME (ns)
80
100
120
3480 G15
60
40
20
0
140
–50 25 –25 0 50 75 100 150 125
RUN/SS PIN VOLTAGE (V)
0
SWITCH CURRENT LIMIT (A)
3.5
1.5
3480 G16
2.0
1.0
0.5 1 2
0.5
0
4.0
3.0
2.5
1.5
2.5 3 3.5
RUN/SS PIN VOLTAGE (V)
0
RUN/SS PIN CURRENT (μA)
8
10
12
15 25
3480 G17
6
4
5 10 20 30 35
2
0
BOOST DIODE CURRENT (A)
0
BOOST DIODE V
f
(V)
0.8
1.0
1.2
2.0
3480 G18
0.6
0.4
0
0.5 1.0 1.5
0.2
1.4
Switch Voltage Drop Boost Pin Current Feedback Voltage
Switching Frequency Frequency Foldback Minimum Switch On-Time
Soft-Start RUN/SS Pin Current Boost Diode