Dual PCI Express, Hot-Plug
Controller
10 ______________________________________________________________________________________
Typical Operating Characteristics (continued)
(V
12VIN
= V
12SA+
= 12V, V
3.3VAUXIN
= V
3.3S_+
= V
ON_
= V
AUXON_
= V
INPUT_
= 3.3V, PRES-DET_ = GND, FON_ = PORADJ = TIM =
float, FAULT_ = 10k& to 3.3VAUXIN, PWRGDA = 10k& to 3.3VAUXO_, T
A
= +25癈, unless otherwise noted, see the Typical
Application Circuit.)
POWER-UP INTO FAULT
(3.3V MAIN)
MAX5946 toc34
3.3V OUTPUT VOLTAGE
2V/div
FAULT_
5V/div
3.3V OUTPUT CURRENT
4A/div
4ms/div
ON_, AUXON_
5V/div
t
SU
R
LOAD
= 0.5&
3.3G_
5V/div
POWER-UP INTO FAULT
(12V OUTPUT)
MAX5946 toc35
12V OUTPUT VOLTAGE
10V/div
FAULT_
5V/div
12V OUTPUT CURRENT
5A/div
4ms/div
ON_, AUXON_
5V/div
t
SU
12G_
10V/div
PRESENT-DETECT (ON/OFF) OPERATION
MAX5946 toc36
40ms/div
5V/div
5V/div
5V/div
10V/div
12V OUTPUT VOLTAGE
3.3VAUXO_
OUTPUT VOLTAGE
PWRGD
PRES-DET_
PRESENT-DETECT (ON/OFF) OPERATION
MAX5946 toc37
4ms/div
5V/div
5V/div
5V/div
10V/div
12V OUTPUT VOLTAGE
3.3VAUXO_
OUTPUT VOLTAGE
PWRGD
PRES-DET_
FORCED-ON (ON/OFF) OPERATION
MAX5946 toc38
40ms/div
5V/div
5V/div
5V/div
10V/div
12V OUTPUT VOLTAGE
3.3VAUXO_
OUTPUT VOLTAGE
PWRGD
FON_
FORCED-ON (ON/OFF) OPERATION
MAX5946 toc39
4ms/div
5V/div
5V/div
5V/div
10V/div
12V OUTPUT VOLTAGE
3.3VAUXO_
OUTPUT VOLTAGE
PWRGD
FON_
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