LTM4641
(Figure 45 circuit with R
fSET
per Table 1 and R
SET1A
, R
SET1B
and R
SET2
per Table 2, unless otherwise noted)
Output Start-Up, 10A Load
V
OUT
1V/DIV
I
IN
1A/DIV
RUN
5V/DIV
V
IN
= 24V
C
IN(MLCC)
= 2
×
10µF X7R
800µs/DIV
4641 G10
TYPICAL PERFORMANCE CHARACTERISTICS
Output Start-Up,
Pre-Bias Condition
V
OUT
1V/DIV
I
LOAD
1mA/DIV
I
IN
200mA/DIV
RUN
5V/DIV
V
IN
= 24V
C
IN(MLCC)
= 2
×
10µF X7R
800µs/DIV
Output Short-Circuit,
No Initial Load
V
OUT
1V/DIV
I
IN
1A/DIV
4641 G11
V
IN
= 24V
C
IN(MLCC)
= 2
×
10µF X7R
20µs/DIV
4641 G12
Output Short-Circuit,
10A Initial Load
V
OUT
1V/DIV
V
IN
20V/DIV
V
INH
2V/DIV
V
OUT
200mV/DIV
CROWBAR
5V/DIV
Start-Up with V
INH
Shorted to SW
Node, 1V
OUT(NOM)
V
IN
10V/DIV
V
INH
5V/DIV
V
OUT
1V/DIV
CROWBAR
5V/DIV
4641 G14
400µs/DIV
FRONT PAGE CIRCUIT WITH V
INH
SHORT
CIRCUITED TO SW PRIOR TO POWER-UP
.
APPLYING UP TO 38V
IN
. NO LOAD
Start-Up with V
INH
Shorted to SW
Node, 3.3V
OUT(NOM)
I
IN
1A/DIV
20µs/DIV
V
IN
= 24V
C
IN(MLCC)
= 2
×
10µF X7R
4641 G13
4641 G15
800µs/DIV
FIGURE 46 CIRCUIT WITH V
INH
SHORT
CIRCUITED TO SW PRIOR TO POWER-UP
.
APPLYING UP TO 38V
IN
. NO LOAD
MODULE OUTPUT CURRENT (A)
8
6
4
2
0
–2
0
16
TOTAL OUTPUT CURRENT (A)
4
8
12
20
4641 G17
V
FB
BANDGAP VOLTAGE (V)
V
IN
10V/DIV
V
INH
10V/DIV
V
OUT
1V/DIV
CROWBAR
5V/DIV
Autonomous Restart with V
INH
Shorted to SW Node, 3.3V
OUT(NOM)
12
10
Paralleled Modules, Current-
Sharing Performance. cf.
Figure 66 Circuit. 28V
IN
0.606
0.604
0.602
0.600
Control IC Bandgap and 1V
REF
Voltages vs Temperature. 28V
IN
1.006
1.004
1V
REF
VOLTAGE (V)
1.002
1.000
0.998
0.996
U1 I
OUT
U2 I
OUT
V
FB
V
1VREF(DC)
4641 G16
100ms/DIV
FIGURE 46 CIRCUIT, SHORT CIRCUITING V
INH
TO SW IN SITU, OPERATING AT 38V
IN
AND
NO LOAD.
LATCH
CONNECTED TO INTV
CC
AND
C
TMR
= 47nF
0.598
0.596
0.994
0.594
–75 –50 –25 0 25 50 75 100 125 150
JUNCTION TEMPERATURE (°C)
4641 G18
4641f
9
LINER [ LINEAR TECHNOLOGY ]
