Datasheet

LTC3861-1
7
38611fa
For more information www.linear.com/LTC3861-1
128-Cycle Overcurrent Counter
(Single Phase Using FDMF6707B
DrMOS)
Typical perFormance characTerisTics
FREQ Pin Current vs Temperature
600kHz Preset Frequency
vs Temperature
400kHz Preset Frequency
vs Temperature
Quiescent Current vs Temperature
Shutdown Quiescent Current
vs Temperature
Oscillator Frequency vs R
FREQ
Overcurrent Threshold
vs Temperature
I
LIM
Pin Current vs Temperature
50µs/DIV
38611 G19
V
OUT
500mV/DIV
V
IN
= 12V
V
OUT
= 1.8V
f
SW
= 500kHz EXTERNAL CLOCK
PWM
2V/DIV
TRACK/SS
200mV/DIV
I
L
20A/DIV
R
FREQ
(kΩ)
0
OSCILLATOR FREQUENCY (MHz)
40
80
100
38611 G20
0.9
2.1
2.3
2.5
0.5
1.7
1.3
0.7
1.9
0.1
0.3
1.5
1.1
20
60
120
TEMPERATURE (°C)
–50
CURRENT SENSE VOLTAGE (mV)
25
30
35
20
15
50
0
100 150
10
5
40
38611 G21
I
LIM
= 1.2V
I
LIM
= 800mV
TEMPERATURE (°C)
–50
I
LIM
PIN CURRENT (µA)
20.0
20.2
20.4
100
19.8
19.6
0 50 150
19.4
19.2
20.6
38611 G22
TEMPERATURE (°C)
–50
FREQ PIN CURRENT (µA)
20.0
20.2
20.4
100
19.8
19.6
0 50 150
19.4
19.0
19.2
20.6
38611 G23
TEMPERATURE (°C)
–50
OSCILLATOR FREQUENCY (kHz)
610
605
615
600
595
590
0 25 75
–25
50 100 125 150
585
580
620
38611 G24
TEMPERATURE (°C)
–50
385
390
380
375
50
0
100 150
370
365
395
OSCILLATOR FREQUENCY (kHz)
38611 G25
TEMPERATURE (°C)
–50
QUIESCENT CURRENT (mA)
22
125
20
18
16
12
0
50
–25
25
75 100 150
14
10
24
38611 G26
V
IN
= 6V
V
CC
= 5V
RUN1 = RUN2 = 5V
TEMPERATURE (°C)
–50
SHUTDOWN CURRENT (µA)
32
33
125
31
30
0
50
–25
25
75 100 150
29
28
34
38611 G27
V
IN
= 6V
V
CC
= 5V