DS2900 Data Sheet

Electrical Specifications

Output

Main DC voltage:

+12 V @ 240 A (high line)

Stand-By:

+3.3 Vsb @ 3 A

Adjustment range:

Regulation:

+12 Vdc; +4% / -4%; +3.3 Vsb; +5% / -5%

Over current:

Constant current type for both the 12 VDC and 3.3V standby.

See Figure 1 below

Over voltage:

+12 Vdc; 14.4 - 15.6 Vdc (110 - 130%); +3.3 Vsb; 3.63 V - 4.29 (110 - 130%)

Under voltage:

+12 Vdc; 9 - 10 V nominal (latch off)

Turn-on delay:

2 second max, 5 - 200 mS, monotonic rise

Main output rise time:

5 - 300 mS, monotonic rise

Vout nominal

Vout

Iout limit

Iout

110%

120%

130%

160%

(+12 Vdc)

(3.3 Vsb)

Figure1

Logic Control

Remote ON/OFF (PSON#)

this signal is not pulled low by the system, or left open, the +12 Vdc output turns off. The 3.30 Vsb output remains on. This signal is pulled to a

stanby voltage by a pull-up resistor internal to the power supply. The power supply fan(s) shall operate at the lowest speed

Signal Type

Accepts an open collector/drain input from the system. Pulled-up to the 3.30 Vsb located in

the power supply

ON

OFF

MIN

MAX

Logic level low (power supply ON)

0 V

0.8 V

Logic level high (power supply OFF)

2.0 V

4.125 V

Source Current, Vpson = low

4 mA

Power up delay: T

pson on delay

5 msec

400 msec

Table 1 PSON# Signal Characteristics