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LT8705 Scheda tecnica(PDF) 9 Page - Linear Technology

Il numero della parte LT8705
Spiegazioni elettronici  Low IQ, 38V Synchronous BoostBuck Controller
PDF  44 Pages
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Produttore elettronici  LINER [Linear Technology]
Homepage  http://www.linear.com
Logo LINER - Linear Technology

LT8705 Scheda tecnica(HTML) 9 Page - Linear Technology

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LTC7812
9
7812fc
For more information www.linear.com/LTC7812
Maximum Current Sense
Threshold vs Duty Cycle
Maximum Current Sense
Threshold vs ITH Voltage
TRACK/SS1 and SS2 Pull-Up Current
vs Temperature
DUTY CYCLE (%)
0
80
60
70
30
40
20
10
50
0
50 60 70 80 90 100
10
7812 G28
20 30 40
BOOST
BUCK
ITH (V)
0
60
40
50
–10
0
–20
30
20
10
–30
1
1.2
1.4
0.2
7812 G29
0.4
0.6
0.8
Burst Mode OPERATION
PULSE-SKIPPING
FORCED CONTINUOUS
DUTY CYCLE = 10%
TEMPERATURE (°C)
–75
6.00
5.75
5.25
5.00
4.25
4.50
5.50
4.75
4.00
0
25 50 75
125
100
150
–50
7812 G30
–25
TYPICAL PERFORMANCE CHARACTERISTICS
Buck Foldback Current Limit
Oscillator Frequency
vs Temperature
Shutdown Current vs Temperature
Shutdown Current
vs Input Voltage
Quiescent Current vs Temperature
TEMPERATURE (°C)
–75
20
16
14
10
18
12
4
6
8
0
25 50 75 100 125 150
–50
7812 G31
–25
VBIAS = 12V
VBIAS INPUT VOLTAGE (V)
5
25
20
15
5
10
0
20
25
30
35
40
10
7812 G32
15
TEMPERATURE (°C)
–75
80
50
60
70
0
10
20
30
40
0
25 50 75 100 125 150
–50
7812 G33
–25
CHANNEL 1 ON
BOTH CHANNELS ON
VFB1 FEEDBACK VOLTAGE (mV)
0
70
60
50
20
10
30
40
65
55
45
15
5
25
35
0
300 400 500 600 700 800
100
7812 G34
200
TEMPERATURE (°C)
–75
600
550
500
350
400
450
300
0
25 50 75 100 125 150
–50
7812 G35
–25
FREQ = INTVCC
FREQ = GND



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