LT8705 Просмотр технического описания (PDF) - Linear Technology
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LT8705 Datasheet PDF : 44 Pages
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LT8705
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C unless otherwise specified.
Efficiency vs Output Current
(Boost Region-Figure 14)
100
90
80
70
60
50
40
30
20
10
0
10
VIN = 36V
VOUT = 48V
BURST
CCM
DCM
100
1000
LOAD CURRENT (mA)
10000
8705 G01
Efficiency vs Output Current
(Buck-Boost Region-Figure 14)
100
90
80
70
60
50
40
30
20
10
0
10
VIN = 48V
VOUT = 48V
BURST
CCM
DCM
100
1000
LOAD CURRENT (mA)
10000
8705 G02
Efficiency vs Output Current
(Buck Region-Figure 14)
100
90
80
70
60
50
40
30
20
10
0
10
VIN = 72V
VOUT = 48V
BURST
CCM
DCM
100
1000
LOAD CURRENT (mA)
10000
8705 G03
Feedback Voltages
1.23
VC = 1.2V
1.22
FBOUT Voltages (Five Parts)
1.23
VC = 1.2V
1.22
1.21
1.21
1.20
1.20
1.19
1.18
1.17
–55 –30
IMON_OUT
IMON_IN
FBOUT
FBIN
–5 20 45 70 95 120 145
TEMPERATURE (°C)
8705 G04
1.19
1.18
1.17
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
8795 G05
Maximum Inductor Current Sense
Voltage vs Duty Cycle
140
BUCK REGION
120
100
80
BOOST REGION
60
40
20
0
0
20
40
60
80
100
M2 OR M3 DUTY CYCLE (%)
8705 G07
Inductor Current Sense Voltage at
Minimum Duty Cycle
120
120
100
100
80
80
60
60
40
40
BUCK REGION
20
20
BOOST REGION
0
0
–20
–20
–40
–40
–60
–60
–80
0.5
1
1.5
VC (V)
–80
2
8705 G08
For more information www.linear.com/8705
Oscillator Frequency
400
RT = 124k
350
300
250
RT = 215k
200
150
RT = 365k
100
50
0
–40 –20
0 20 40 60 80 100 120
TEMPERATURE (°C)
8705 G06
Maximum Inductor Current Sense
Voltage at Minimum Duty Cycle
120
BOOST REGION
100
80
BUCK REGION
60
40
20
0
–40 –20
0 20 40 60 80 100 120
TEMPERATURE (°C)
8705 G09
8705p
7
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