LT3694 Просмотр технического описания (PDF) - Linear Technology
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LT3694 Datasheet PDF : 28 Pages
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LT3694/LT3694-1
TYPICAL PERFORMANCE CHARACTERISTICS VIN = 12V, TA = 25°C, unless otherwise noted.
Efficiency at VOUT = 5V
100
VIN = 6.3V
fSW = 800kHz
90
VIN = 12V
80
VIN = 36V
70
60
50
0
1
2
IOUT (A)
3
36941 G01
Switch Current Limit
vs Temperature
5.0
4.5
4.0
3.5
3.0
–50
0
50
100
TEMPERATURE (°C)
150
36941 G04
Switch VCESAT vs Switch Current
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
0
1
2
3
SWITCH CURRENT (A)
36941 G02
Switch Current Limit
vs Duty Cycle
5.0
–45°C 25°C
4.5
150°C
4.0
3.5
3.0
0
20
40
60
80
100
SWITCH DUTY CYCLE (%)
36941 G05
BST Pin Current
vs Switch Current
70
60
50
40
30
20
10
0
0
1
2
3
SWITCH CURRENT (A)
36941 G03
Switch Minimum On-Time and
Off-Time vs Temperature
160 ISW = 1A
140
120
MINIMUM
ON-TIME
100
80
MINIMUM
OFF-TIME
60
40
20
0
–50
0
50
100
150
TEMPERATURE (°C)
36941 G06
VFB vs Temperature
760
758
756
754
752
750
748
746
744
742
740
–50
0
50
100
TEMPERATURE (°C)
150
36941 G07
Frequency vs RT
3.0
2.5
2.0
1.5
1.0
0.5
0
0
50
100
RT (k)
150
200
36941 G08
Frequency Shift vs Temperature
5
RT = 200k
4
3
RT =
40.2k
2
1
RT = 10.7k
0
–1
–2
–3
–4
–5
–50
0
50
100
TEMPERATURE (°C)
150
36941 G09
36941fb
5
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