LTC3882-1
11
Rev A
Soft-Start Ramp
Start-Up Into a Prebiased Load
Soft-Off Ramp
TYPICAL PERFORMANCE CHARACTERISTICS
Output Overvoltage Threshold
Error vs Temperature
Output Overcurrent Threshold
Error vs Temperature
PWM Frequency vs Temperature
TEMPERATURE (°C)
–40
V
OUT
OV THRESHOLD ERROR (%)
0.10
0.05
0
–0.10
–0.05
–0.15
60
80
38821 G21
120
100
20
40
–20
0
VOUT_OV_FAULT_LIMIT = 2V
V
OUT
RANGE = 1
OUTPUT OC THRESHOLD ERROR (%)
1.2
0.8
0.4
0
1.0
0.6
0.2
–0.2
–0.4
38821 G22
TEMPERATURE (°C)
–40
60
80
120
100
20
40
–20
0
PWM FREQUENCY (kHz)
500.2
500.1
499.9
499.7
500.0
499.8
499.6
499.5
38821 G23
TEMPERATURE (°C)
–40
60
80
120
100
20
40
–20
0
FREQUENCY_SWITCH = 500kHz
RUN
2V/DIV
V
OUT
1V/DIV
5ms/DIV
TOFF_DELAY = 10ms
TOFF_FALL = 5ms
38821 G20
V
OUT
0.5V/DIV
1ms/DIV
38821 G18
I
L1
, I
L2
10A/DIV
V
IN
= 12V
V
OUT
0.5V/DIV
0V
1ms/DIV
38821 G19
I
L1
, I
L2
10A/DIV
V
IN
= 12V
VOUT_COMMAND INL
Regulated Output vs Temperature
VOUT_COMMAND DNL
V
OUT
(V)
0.3
INL (LSB)
1.5
1.0
0
0.5
–0.5
–1.0
4.3
5.1
38821 G01
5.5
3.5
1.1
2.7
1.9
V
OUT
(V)
0.3
DNL (LSB)
1.0
0.8
0.4
0
–0.4
0.6
0.2
–0.2
–0.6
–0.8
4.3
5.1
38821 G02
5.5
3.5
1.1
2.7
1.9
TEMPERATURE (°C)
–40
V
OUT
(V)
1.8000
1.7995
1.7985
1.7975
1.7990
1.7980
1.7970
60
80
38821 G01a
120
100
20
40
–20
0
VOUT_COMMAND = 1.8V
DIGITAL SERVO OFF
