LTC3711 Datasheet, PDF (4/24 Pages) Linear Technology – 5-Bit Adjustable, Wide Operating Range, No RSENSE

LTC3711
TYPICAL PERFOR A CE CHARACTERISTICS
Transient Response
V_OUT
50mV/DIV
I_L
10A/DIV
20µs/DIV
LOAD STEP = 0A TO 15A
V_IN = 15V
V_OUT = 1.5V
FCB = 0V
FIGURE 9 CIRCUIT
Transient Response
(Discontinuous Mode)
V_OUT
50mV/DIV
I_L
10A/DIV
3711 G01
20µs/DIV
LOAD STEP = 1A TO 15A
V_IN = 15V
V_OUT = 1.5V
FCB = INTV_CC
FIGURE 9 CIRCUIT
Start-Up
RUN/SS
2V/DIV
V_OUT
1V/DIV
I_L
10A/DIV
3711 G02
50ms/DIV
V_IN = 15V
V_OUT = 1.5V
R_LOAD = 0.1Ω
FIGURE 9 CIRCUIT
3711 G03
Efficiency vs Load Current
100
DISCONTINUOUS
90
MODE
80
70
60
50
0.001
CONTINUOUS
MODE
V_IN = 15V
V_OUT = 1.5V
EXTV_CC = 5V
FIGURE 9 CIRCUIT
0.01
0.1
1
10
LOAD CURRENT (A)
3711 G04
Frequency vs Input Voltage
350
FIGURE 9 CIRCUIT
FCB = 0V
325
300
I_OUT = 15A
275
I_OUT = 0A
250
225
200
5
10
15
20
INPUT VOLTAGE (V)
25
3711 G07
4
Efficiency vs Input Voltage
100
FIGURE 9 CIRCUIT
FCB = 5V
95 EXTV_CC = 5V
90
I_LOAD = 1.5A
85
I_LOAD = 15A
80
75
70
0
5 10 15 20 25 30
INPUT VOLTAGE (V)
3711 G05
I_TH Voltage vs Load Current
2.5
FIGURE 9 CIRCUIT
FCB = 0V
2.0
1.5
1.0
0.5
0
0
5
10
15
20
25
LOAD CURRENT (A)
3711 G09
Frequency vs Load Current
350
300
CONTINUOUS MODE
250
200
DISCONTINUOUS MODE
150
100
50
FIGURE 9 CIRCUIT
0
0
2
4
6
8
10
LOAD CURRENT (A)
3711 G06
Current Sense Threshold
vs I_TH Voltage
300
V_RNG = ^2V
200
1.4V
1V
100
0.7V
0.5V
0
–100
–200
0
0.5 1.0 1.5 2.0
I_TH VOLTAGE (V)
2.5 3.0
3711 G10
3711f