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| LTC3813 Datasheet, PDF (5/32 Pages) Linear Technology – 100V Current Mode Synchronous Step-Up Controller | |||
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TYPICAL PERFORMANCE CHARACTERISTICS
LTC3813
Load Transient Response
VOUT
200mV/
DIV
IOUT
2A/DIV
100μs/DIV
FIGURE 14 CIRCUIT
VIN = 12V
0A TO 4A LOAD STEP
Start-Up
VOUT
20V/DIV
SS
4V/DIV
3813 G01
IL
5A/DIV
1ms/DIV
FRONT PAGE CIRCUIT
VIN = 24V
ILOAD = 2A
Overcurrent Operation
VOUT
20V/DIV
IL
5A/DIV
3813 G02
500μs/DIV
FRONT PAGE CIRCUIT
VIN = 24V
RSHORT = 1Ω
3813 G03
Efï¬ciency vs Load Current
100
VOUT = 24V
VIN = 12V
95
90
VIN = 5V
85
80
0
1
2
3
4
LOAD (A)
3813 G04
Current Sense Threshold
vs ITH Voltage
400
VRNG = 2V
300
200
1.4V
1V
100
0.7V
0.5V
0
â100
â200
â300
â400
0 0.5 1 1.5 2
ITH VOLTAGE (V)
2.5 3
3813 G07
Frequency vs Input Voltage
300
FRONT PAGE CIRCUIT
280
ILOAD = 0A
260
ILOAD = 1A
240
220
200
10
15 20 25 30 35 40
INPUT VOLTAGE (V)
3813 G05
Frequency vs Load Current
280
FRONT PAGE CIRCUIT
270
260
250
VIN = 24V
240
230
220
VIN = 12V
210
200
0
1
2
3
LOAD CURRENT (A)
4
3813 G06
Off-Time vs IOFF Current
10000
VOFF = INTVCC
1000
100
10
10
100
1000
IOFF CURRENT (μA)
10000
3813 G08
Off-Time vs VOFF Voltage
700
IOFF = 300μA
600
500
400
300
200
100
0
0 0.5 1 1.5 2 2.5 3
VOFF VOLTAGE (V)
3813 G09
3813fb
5
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