Datasheet

LTC3814-5
5
38145fc
Effi ciency vs Load Current
Frequency vs Input Voltage Frequency vs Load Current
I
TH
Voltage vs Load Current
Off-Time vs I
OFF
Current
Off-Time vs Temperature
TYPICAL PERFORMANCE CHARACTERISTICS
Current Sense Threshold
vs I
TH
Voltage
Maximum Current Sense
Threshold vs V
RNG
Voltage
Maximum Current Sense
Threshold vs Temperature
LOAD (A)
EFFICIENCY (%)
90
95
85
80
100
38145 G04
V
IN
= 12V
V
IN
= 24V
V
IN
= 36V
V
OUT
= 50V
04
123 5
INPUT VOLTAGE (V)
5
FREQUENCY (kHz)
260
280
300
13
240
220
200
7
9
11
15
38145 G05
I
LOAD
= 0A
I
LOAD
= 1A
FRONT PAGE CIRCUIT
LOAD CURRENT (A)
0
FREQUENCY (kHz)
260
280
300
240
220
200
1
2
3
4
38145 G06
V
IN
= 5V
V
IN
= 12V
FRONT PAGE CIRCUIT
LOAD CURRENT (A)
I
TH
VOLTAGE (V)
1
2
0
3
38145 G07
FRONT PAGE CIRCUIT
V
IN
= 12V
V
RNG
= 1V
04
123 5
I
TH
VOLTAGE (V)
0
–400
CURRENT SENSE THRESHOLD (mV)
–200
–300
–100
0
100
200
400
0.5
1 1.5 2
38145 G08
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
38145 G09
V
OFF
= INTV
CC
TEMPERATURE (°C)
–50
OFF-TIME (ns)
640
660
680
25 75
38145 G10
620
600
–25 0
50 100 125
580
560
I
OFF
= 300µA
V
RNG
VOLTAGE (V)
0.5
MAXIMUM CURRENT SENSE THRESHOLD (mV)
200
38145 G11
100
0
1 1.5
300
400
2
TEMPERATURE (°C)
–50 –25
190
MAXIMUM CURRENT SENSE THRESHOLD (mV)
210
240
0
50
75
38145 G12
200
230
220
25
100
125
V
RNG
= INTV
CC