LTC1778EGN-1 データシートの表示（PDF） - Linear Technology
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LTC1778EGN-1 Datasheet PDF : 24 Pages
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LTC1778/LTC1778-1
TYPICAL PERFOR A CE CHARACTERISTICS
Transient Response
VOUT
50mV/DIV
IL
5A/DIV
Transient Response
(Discontinuous Mode)
VOUT
50mV/DIV
IL
5A/DIV
Start-Up
RUN/SS
2V/DIV
VOUT
1V/DIV
IL
5A/DIV
20µs/DIV
LOAD STEP 0A TO 10A
VIN = 15V
VOUT = 2.5V
FCB = 0V
FIGURE 9 CIRCUIT
1778 G01
Efficiency vs Load Current
100
90
DISCONTINUOUS
MODE
80
CONTINUOUS
MODE
70
60
50
0.001
VIN = 10V
VOUT = 2.5V
EXTVCC = 5V
FIGURE 9 CIRCUIT
0.01
0.1
1
10
LOAD CURRENT (A)
1778 G03
Frequency vs Load Current
300
CONTINUOUS MODE
250
200
DISCONTINUOUS
MODE
150
100
50
0
0
2
4
6
8
10
LOAD CURRENT (A)
1778 G26
20µs/DIV
LOAD STEP 1A TO 10A
VIN = 15V
VOUT = 2.5V
FCB = INTVCC
FIGURE 9 CIRCUIT
1778 G02
Efficiency vs Input Voltage
100
FCB = 5V
FIGURE 9 CIRCUIT
95
ILOAD = 1A
90
ILOAD = 10A
85
80
0
5 10 15 20 25 30
INPUT VOLTAGE (V)
1778 G04
Load Regulation
0
FIGURE 9 CIRCUIT
–0.1
–0.2
–0.3
–0.4
0
2
4
6
8
10
LOAD CURRENT (A)
1778 G06
VIN = 15V
VOUT = 2.5V
RLOAD = 0.25Ω
50ms/DIV
1778 G19
Frequency vs Input Voltage
300
FCB = 0V
FIGURE 9 CIRCUIT
280
IOUT = 10A
260
240
IOUT = 0A
220
200
5
10
15
20
INPUT VOLTAGE (V)
25
1778 G05
ITH Voltage vs Load Current
2.5
FIGURE 9 CIRCUIT
2.0
1.5
CONTINUOUS
MODE
1.0
DISCONTINUOUS
0.5
MODE
0
0
5
10
LOAD CURRENT (A)
15
1778 G07
1778fb
4
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