12V PWM Controller with Hot-Swap
_______________________________________________________________________________________ 9
STARTUP SEQUENCING (FIGURE 1)
MAX5950 toc23c
2ms/div
DCEN0 = DCENI1 =
STARTUP
5V/div
OUT1
1V/div
OUT3
1V/div
OUT2
1V/div
PWREN SWITCHING FROM HIGH TO LOW
PGI = PGOOD3
5V/div
CSTART = 1礔
TRACKING (FIGURE 1)
MAX5950 toc23d
400祍/div
DCEN0 - DCENI_ =
STARTUP_
5V/div
OUT1
1V/div
OUT3
1V/div
OUT2
1V/div
PWREN SWITCHING FROM HIGH TO LOW
PGOOD_
5V/div
STARTUP FAULT
MAX5950 toc24a
20ms/div
DCEN0 =
DCENI1 =
STARTUP_
5V/div
OUT1
1V/div
OUT3
SHORTED
TO PGND
2V/div
OUT2
2V/div
PWREN SWITCHING FROM HIGH TO LOW
PGI = PGOOD3
5V/div
0V
0V
0V
0V
0V
MAX5950 toc24b
40ms/div
DCEN0 =
DCENI1 =
STARTUP_
5V/div
VOUT1
1V/div
T H RTED T P ND
PGI = PGOOD3
1V/div
0V
0V
0V
0V
0V
PWREN SWITCHING FROM HIGH TO LOW
MPWRGD
2V/div
MPWRFLT
2V/div
STARTUP FAULT
OVERLOAD RESPONSE
MAX5950 toc25a
4祍/div
I
OUT1
2A/div
LX
10V/div
DL
10V/div
OUT1
1V/div
STARTUP
5V/div
V
V
V
V
V
OVERLOAD RESPONSE (HICCUP MODE)
MAX5950 toc25b
400祍/div
IOUT1
2A/div
LX
10V/div
DL
10V/div
OUT1
1V/div
STARTUP
5V/div
SHORT-CIRCUIT RESPONSE
MAX5950 toc26a
2祍/div
VOUT1 SHORTED
TO PGND
1V/div
LX
10V/div
DL
5V/div
STARTUP
5V/div
SHORT-CIRCUIT RESPONSE
(HICCUP MODE)
MAX5950 toc26b
400祍/div
OUT1
SHORTED
TO PGND
1V/div
I
OUT1
2A/div
LX
10V/div
DL
10V/div
STARTUP
5V/div
Typical Operating Characteristics (continued)
(Typical Application Circuits. V
IN
= V
PWM_IN
= 12V, V
DREG
= V
REG
, V
PGND
= 0V, V
SYNCIN
= 0V, R
RT
= 49.9k&, R
ILIM
= 48.7k&, C
REG
= 2.2礔, T
A
= +25癈, unless otherwise noted.)
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