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LTC3255 Datasheet(PDF) 5 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) 5 Page - Linear Technology

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LTC7820
5
7820fc
For more information www.linear.com/LTC7820
TYPICAL PERFORMANCE CHARACTERISTICS
Efficiency vs Load Current
48V to 24V Voltage Divider in
Figure 7
Efficiency vs Load Current
24V to 12V Voltage Divider in
Figure 7
Efficiency vs Load Current
24V to 48V Voltage Doubler in
Figure 8
Efficiency vs Load Current
24V to –24V Inverter in Figure 9
Steady State Output Ripple
in Figure 7
Output Voltage vs Load Current
24V to –24V Inverter in Figure 9
Output Voltage vs Load Current
48V to 24V Voltage Divider in
Figure 7
Output Voltage vs Load Current
24V to 48V Voltage Doubler in
Figure 8
LOAD CURRENT (A)
1
100.0
95.5
99.5
98.5
97.5
96.5
99.0
98.0
97.0
96.0
95.0
11
7
7820 G01
15
9
5
13
3
fS = 150kHz
fS = 200kHz
fS = 250kHz
fS = 300kHz
LOAD CURRENT (A)
0
98.0
93.5
97.5
96.5
95.5
94.5
97.0
96.0
95.0
94.0
93.0
6
7820 G04
10
8
4
2
fS = 150kHz
fS = 200kHz
fS = 250kHz
fS = 300kHz
LOAD CURRENT (A)
0
–22.8
–23.8
–23.0
–23.4
–23.2
–23.6
–24.2
–24.0
6
4
7820 G07
10
8
2
fS = 150kHz
fS = 200kHz
fS = 250kHz
fS = 300kHz
LOAD CURRENT (A)
0
1
48.1
47.2
48.0
47.8
47.6
47.4
47.9
47.7
47.5
47.3
47.1
6
4
7820 G06
8
5
3
7
2
fS = 150kHz
fS = 200kHz
fS = 250kHz
fS = 300kHz
LOAD CURRENT (A)
–1
1
24.05
23.60
24.00
23.90
23.80
23.70
23.95
23.85
23.75
23.65
23.55
11
7
7820 G05
15
9
5
13
3
fS = 150kHz
fS = 200kHz
fS = 250kHz
fS = 300kHz
LOAD CURRENT (A)
1
100.0
95.5
99.5
98.5
97.5
96.5
99.0
98.0
97.0
96.0
95.0
11
7
7820 G02
15
9
5
13
3
fS = 150kHz
fS = 200kHz
fS = 250kHz
fS = 300kHz
LOAD CURRENT (A)
0.5
100.0
95.5
99.5
98.5
97.5
96.5
99.0
98.0
97.0
96.0
95.0
5.5
3.5
7820 G03
7.5
4.5
2.5
6.5
1.5
fS = 150kHz
fS = 200kHz
fS = 250kHz
fS = 300kHz
10µs/DIV
VIN = 48V
VOUT = 24V
ILOAD = 10A
150kHz
200mV/DIV
AC-COUPLED
200kHz
200mV/DIV
AC-COUPLED
250kHz
200mV/DIV
AC-COUPLED
7820 G08
TA = 25°C, unless otherwise noted.
Load Transient 0A-10A-0A
48V to 24V Divider in Figure 7
50µs/DIV
fS = 250kHz
VOUT
200mV/DIV
AC-COUPLED
ILOAD
5A/DIV
7820 G09



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