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LTC3255 Datasheet(PDF) 6 Page - Linear Technology

Part # LTC3255
Description  Fixed Ratio High Power Inductorless (Charge Pump) DC/DC Controller
PDF  28 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3255 Datasheet(HTML) 6 Page - Linear Technology

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LTC7820
6
7820fc
For more information www.linear.com/LTC7820
TYPICAL PERFORMANCE CHARACTERISTICS
Driver Voltage vs Frequency, in
Figure 7
VCC Shutdown Current vs
Temperature
Short-Circuit and Retry
24V to 12V Divider
Shutdown 48V to 24V Voltage
Divider, RUN Pin FLOAT
INTVCC Line Regulation
200ms/DIV
VOUT
10V/DIV
FAULT
10V/DIV
TIMER
5V/DIV
SW3
20V/DIV
7820 G13
VCC VOLTAGE (V)
0
10
6
2
4
5
3
0
1
60
40
7820 G10
80
50
30
70
20
TEMPERATURE (°C)
–50
85
60
80
70
75
65
40
50
45
55
100
50
7820 G11
150
0
VCC = 12V
VCC = 48V
VCC = 72V
FREQUENCY (kHz)
0
5.8
4.8
5.6
5.2
5.4
5.0
4.0
4.4
4.2
4.6
1000
800
600
400
7820 G12
1200
200
INTVCC
BOOST3-SW3
BOOST2-VLOW
BOOST1-SW1
25°C
125°C
–45°C
25°C
125°C
–45°C
25°C
125°C
–45°C
25°C
125°C
–45°C
100ms/DIV
VOUT
20V/DIV
VIN
20V/DIV
RUN
5V/DIV
SW3
20V/DIV
7820 G15
TA = 25°C, unless otherwise noted.
Start-Up 48V to 24V Voltage
Divider, RUN Pin FLOAT
100ms/DIV
VOUT
20V/DIV
VIN
20V/DIV
RUN
5V/DIV
SW3
20V/DIV
7820 G14
Input Current During Short Circuit
48V to 24V Divider
Divider Efficiency
vs CFLY in Figure 11
Voltage Divider Line Transient
tr = tr = 100µs, fS = 500kHz
5µs/DIV
VIN
20V/DIV
VOUT
20V/DIV
SW3
50V/DIV
IIN
20A/DIV
7820 G16
100µs/DIV
VIN
5V/DIV
VOUT
5V/DIV
SW3
10V/DIV
7820 G17
48V to 24V AT 10A LOAD
24V to 12V AT 20A LOAD
QUANTITY OF 10µF CFLY IN PARALLEL
8
10
12
14
16
96
97
98
99
100
7820 G18



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