Datasheet

LT8705
9
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For more information www.linear.com/LT8705
Typical perForMance characTerisTics
Discontinuous Mode (Figure 14)
Forced Continuous Mode
(Figure 14)
Forced Continuous Mode
(Figure 14)
Forced Continuous Mode
(Figure 14)
SHDN and MODE Pin Currents
Internal V
IN
UVLO
SRVO_xx Pin Activation
Thresholds
SRVO_xx Pin Activation Threshold
Hysteresis
PIN VOLTAGE (V)
0
CURRENT INTO PIN (µA)
10
14
18
24
8705 G19
6
2
8
12
16
4
0
–2
63
129
18 21 27
15
30
MODE
SHDN
TEMPERATURE (°C)
–40 –20
0
V
IN
UVLO (V)
0.5
1.0
1.5
2.0
2.5
3.0
0 20 40 60 80 100 120
8705 G20
TEMPERATURE (°C)
–50
V
PIN
-V
REGULATION
V
PIN
APPROACHING V
REGULATION
(mV)
25
75
150
8705 G21
–25
–75
0
50
100
–25
25
75
125
125
0
50
–50
100
FBIN
FBOUT
IMON_IN
IMON_OUT
TEMPERATURE (°C)
–50
PIN ACTIVATION THRESHOLD HYSTERSIS (mV)
30
40
50
25 75 150
8705 G22
20
10
0
–25 0
50
100 125
FBIN
FBOUT
IMON_IN
IMON_OUT
SW1
50V/DIV
SW2
50V/DIV
I
L
2A/DIV
5µs/DIVV
IN
= 72V
V
OUT
= 48V
8705 G23
SW1
20V/DIV
SW2
20V/DIV
I
L
2A/DIV
5µs/DIVV
IN
= 36V
V
OUT
= 48V
8705 G24
SW1
20V/DIV
SW2
20V/DIV
I
L
2A/DIV
5µs/DIVV
IN
= 48V
V
OUT
= 48V
8705 G25
SW1
50V/DIV
SW2
20V/DIV
I
L
2A/DIV
5µs/DIVV
IN
= 72V
V
OUT
= 48V
8705 G26
T
A
= 25°C unless otherwise specified.