ltc3711 Linear Technology Corporation, ltc3711 Datasheet - Page 4

• Manufacturer Part Number: ltc3711
• Description: 5-bit Adjustable, Wide Operating Range, No Rsense? Step-down Controller
• Manufacturer: Linear Technology Corporation

LTC3711
TYPICAL PERFOR A CE CHARACTERISTICS
4
50mV/DIV
10A/DIV
350
325
300
275
250
225
200
100
90
80
70
60
50
V
0.001
OUT
Frequency vs Input Voltage
5
Efficiency vs Load Current
I
L
FIGURE 9 CIRCUIT
FCB = 0V
Transient Response
LOAD STEP = 0A TO 15A
V
V
FCB = 0V
FIGURE 9 CIRCUIT
IN
OUT
= 15V
= 1.5V
DISCONTINUOUS
MODE
0.01
10
I
I
OUT
OUT
INPUT VOLTAGE (V)
LOAD CURRENT (A)
= 15A
= 0A
0.1
15
20 s/DIV
CONTINUOUS
MODE
V
V
EXTV
FIGURE 9 CIRCUIT
IN
OUT
= 15V
CC
= 1.5V
20
1
W
= 5V
3711 G04
3711 G07
U
3711 G01
10
25
50mV/DIV
10A/DIV
100
2.5
2.0
1.5
1.0
0.5
95
90
85
80
75
70
V
0
OUT
0
I
I
0
Efficiency vs Input Voltage
L
TH
FIGURE 9 CIRCUIT
FCB = 5V
EXTV
FIGURE 9 CIRCUIT
FCB = 0V
Transient Response
(Discontinuous Mode)
LOAD STEP = 1A TO 15A
V
V
FCB = INTV
FIGURE 9 CIRCUIT
Voltage vs Load Current
IN
OUT
= 15V
CC
5
= 1.5V
5
= 5V
I
LOAD
LOAD CURRENT (A)
CC
INPUT VOLTAGE (V)
10
= 15A
10
20 s/DIV
15
I
LOAD
15
20
= 1.5A
20
25
3711 G09
3711 G05
3711 G02
25
30
RUN/SS
10A/DIV
2V/DIV
1V/DIV
–100
–200
350
300
250
200
150
100
300
200
100
V
50
OUT
0
0
I
L
0
Frequency vs Load Current
Current Sense Threshold
vs I
0
V
V
R
FIGURE 9 CIRCUIT
Start-Up
IN
OUT
LOAD
TH
= 15V
0.5
= 1.5V
= 0.1
Voltage
2
DISCONTINUOUS MODE
LOAD CURRENT (A)
1.0
I
TH
4
VOLTAGE (V)
50ms/DIV
CONTINUOUS MODE
1.5
FIGURE 9 CIRCUIT
V
6
RNG
2.0
=
8
2.5
1.4V
1V
2V
0.7V
0.5V
3711 G10
3711 G06
3711 G03
3711f
3.0
10