picoPSU-90
Introduction
Based on the electrical design of the picoPSU-120, the picoPSU-90 is
a small yet powerful and fully compliant ATX power supply designed to
power a wide variety of motherboard from a single 12V regulated
power source.
The PICOPSU-90 is the only snap power supply solution for general
purpose motherboards. Compatible with an entire range of mini-ITX,
UATX or full size ATX motherboards the picoPSU-90 provides cool,
silent power for system. The PICOPSU-90 has many advantages over
a regular power supply:
-Smallest ATX PSU to date
-100% silent operation
-Low heat dissipation with efficiency over 95%
-Plugs directly into the motherboard’s power connector, no cable mess
12V, 90Watt ATX Power Supply
Quick Installation Guide
Version 1.0b
P/N picoPSU-90
ATX DC-DC Converter Series
Quick installation Instructions
The PICOPSU-90 has been specifically designed for the Mini-ITX form
factor, thus eliminating the need for ATX power cables. It is also 1U
compliant – height will not exceed 1U form factor.
1) After the picoPSU module was ‘snapped in’, hook the hard drive
power or floppy power to your floppy/hard drives. If more hard drives or
floppy connectors are needed, use a HDD/floppy “Y” splitter cable.
PicoPSu-90 shown with the D201GLY Intel Motherboard.
2) Connect a 12 VDC power adapter (or any 12V source) to the DC-toDC connector, center pin / white wire is positive (+).
3) Turn on the PC using the motherboard ON/OFF motherboard switch
Typical configuration
picoPSU-90 Quick Installation Guide Page 2
ATX DC-DC Converter Series
The picoPSU-90 has been tested with all mini-ITX board (VIA C3, VIA
C7, AMD, Celeron, Core Solo and Core Duo) under virtually any disk /
floppy / CDROM / PCI configuration. Additionally, the PICOPSU-90
can power P4 boards equipped with an 12VATX 4 pin connector.
NOTE: The hard drive cable harness can be disconnected in case the
user does not need any peripheral. Additionally, the cable harness can
be made to any length or output connector type provided that the max
load does not exceed 6A for GND return. Please look under
specifications for the mating connector type.
Removing the picoPSU-90
In order to remove the picoPSU you must release the power connector
latch and then remove the unit. Gently lift the picoPSU out from the
ATX connector, by grabbing from the picoPSU PCB, not from
components or the wire harness.
Specifications, picoPSU-90, 90Watts DC-DC ATX Power Supply
Power Ratings (Peak Load = 120 Watts)
Volts (V) Max Load (A) Peak Load (A) Regulation %
5V 6A 7A+/- 1.5%
5VSB 1.5A 2A+/- 1.5%
3.3V 6A 7A+/- 1.5%
-12V 0.05A 0.1A+/- 5%
12V 6A 8A Switched input
At max load, forced air ventilation is required. For fanless operation
de-rate the output of the 3.3 and 5V rails by ~20%. Peak load should
not exceed 60 seconds.
picoPSU-90 Quick Installation Guide Page 3
ATX DC-DC Converter Series
Input Requirements: 12V regulated, min=2A, max=10A (load
dependent). Over-voltage shutdown will occur at ~13-13.5V.
Size: 44.5mm(L) * 20mm(W) * 30mm (H) (1U compliant)
Weight: 45gramms, including cable harness, 20 grams without cable
harness.
DC-Jack: Female, panel mount, 2.5*5.5*10 mm.
Connectors
Molex 39-01-2200 compatible, two 3.5” drive power connectors (PATA
and SATA) and one P4-12V 4 connector (mini-fit JR 4p). Header and
mating connector for the removable cable harness can be found at:
http://www.jst-mfg.com/product/pdf/eEH.pdf
Overload protection
Over load protection will be effected when either of the loads (+5V &
+3.3V) exceeds > 200% Max Load.
Turn-on Delay
After turning on, at least 20 ms will be needed for the rise of +5VSB
output voltage (measured from 10% to 95%) to reach its peak.
Remote ON/OFF control (PS_ON)
Logic level is LOW - Output voltage is enabled (PS_ON pin)
Logic level is HIGH - Output voltage is disabled (PS_ON pin)
PWR_GD
Logic level is low: PWR_GD=OK
Logic level is high: PWR_GD=not OK (10.5V<V(in)>13.5V or other
fault conditions)
Operating environment: Temperature: -20 to 85 degree centigrade.
NOTE: Thermal shutdown occurs at 105-115C.
Relative Humidity: 10 to 90 percent, non-condensing.
Efficiency, MTBF: 95%. MTBF=100K hours at 55Celsius.
Shipping and storage: Temperature -40 to +85 degree centigrade.
Relative humidity 5 to 95 percent, non-condensing
picoPSU-90 Quick Installation Guide Page 4
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