LTC3812-5_15 Datasheet, PDF (5/34 Pages) Linear Technology – 60V Current Mode Synchronous Switching Regulator Controller

LTC3812-5
TYPICAL PERFORMANCE CHARACTERISTICS
Load Transient Response
Start-Up
Short-Circuit/Fault Timeout
Operation
V_OUT
50mV/DIV
I_OUT
5A/DIV
10μs/DIV
FRONT PAGE CIRCUIT
V_IN = 25V
0A TO 5A LOAD STEP
38125 G01
V_IN
20V/DIV
INTV_CC,
V_OUT
2V/DIV
INTV_CC
V_OUT
I_L
2A/DIV
2ms/DIV
FRONT PAGE CIRCUIT
V_IN = 30V
I_LOAD = 0.5A
FCB = 0V
V_OUT
5V/DIV
SS/TRACK
2V/DIV
I_L
5A/DIV
38125 G02
5ms/DIV
FRONT PAGE CIRCUIT
V_IN = 25V
R_SHORT = 0.1Ω
38125 G03
Short-Circuit/Foldback Operation
Pulse-Skipping Mode Operation
V_OUT
5V/DIV
I_L
5A/DIV
200μs/DIV
FRONT PAGE CIRCUIT
V_IN = 25V
V_OUT
100mV/DIV
I_TH
0.5A/DIV
I_L
2A/DIV
38125 G04
20μs/DIV
FRONT PAGE CIRCUIT
V_IN = 25V
I_OUT = 100mA
FCB = INTV_CC
38125 G05
Efficiency vs Input Voltage
100
FRONT PAGE CIRCUIT
f = 250kHz
95
I_LOAD = 5A
FORCED
CONTINUOUS
90
I_LOAD = 0.5A
FORCED
CONTINUOUS
I_LOAD = 0.5A
85
PULSE-SKIPPING
80
0
10 20 30 40 50 60
INPUT VOLTAGE (V)
38125 G06
Efficiency vs Load Current
100
V_IN = 24V
95
V_IN = 42V
90
V_OUT = 12V
FCB = INTV_CC
f = 250kHz
85
0
1
2
3
4
LOAD CURRENT (A)
56
38125 G07
Frequency vs Input Voltage
300
FRONT PAGE CIRCUIT
290 _{FCB = 0V}
280
LOAD = 5A
270
260
250
240
LOAD = 0A
230
220
210
200
0
10 20 30 40 50 60
INPUT VOLTAGE (V)
LT1108 • TPC12
Frequency vs Load Current
350
FRONT PAGE CIRCUIT
300 _FORCED
CONTINUOUS
250
200
PULSE SKIPPING
150
100
50
0
0
1
2
3
4
5
LOAD CURRENT (A)
38125 G09
38125fc
5