Datasheet

LTC3813
5
3813fb
Load Transient Response Start-Up
Overcurrent Operation
Effi ciency vs Load Current
Frequency vs Input Voltage
Frequency vs Load Current
Current Sense Threshold
vs I
TH
Voltage Off-Time vs I
OFF
Current Off-Time vs V
OFF
Voltage
TYPICAL PERFORMANCE CHARACTERISTICS
V
OUT
200mV/
DIV
100
μs/DIV
FIGURE 14 CIRCUIT
V
IN
= 12V
0A TO 4A LOAD STEP
3813 G01
I
OUT
2A/DIV
3813 G02
1ms/DIV
V
OUT
20V/DIV
SS
4V/DIV
I
L
5A/DIV
FRONT PAGE CIRCUIT
V
IN
= 24V
I
LOAD
= 2A
3813 G03
500μs/DIV
V
OUT
20V/DIV
I
L
5A/DIV
FRONT PAGE CIRCUIT
V
IN
= 24V
R
SHORT
= 1Ω
LOAD (A)
0
EFFICIENCY (%)
90
95
4
85
80
1
2
3
100
3813 G04
V
IN
= 12V
V
OUT
= 24V
V
IN
= 5V
INPUT VOLTAGE (V)
10
FREQUENCY (kHz)
260
280
300
30 35
240
220
200
15
20
25
40
3813 G05
I
LOAD
= 0A
I
LOAD
= 1A
FRONT PAGE CIRCUIT
200
220
210
230
240
250
260
280
270
LOAD CURRENT (A)
0
FREQUENCY (kHz)
1
2
3
4
3813 G06
V
IN
= 12V
V
IN
= 24V
FRONT PAGE CIRCUIT
I
TH
VOLTAGE (V)
0
–400
CURRENT SENSE THRESHOLD (mV)
–300
–200
–100
0
100
200
400
0.5
1 1.5 2
3813 G07
2.5 3
300
V
RNG
= 2V
1.4V
1V
0.7V
0.5V
I
OFF
CURRENT (μA)
10
10
OFF-TIME (ns)
100
1000
10000
100 1000 10000
3813 G08
V
OFF
= INTV
CC
V
OFF
VOLTAGE (V)
0
400
500
700
1.5 2.5
3813 G09
300
200
0.5 1
23
100
0
600
OFF-TIME (ns)
I
OFF
= 300μA