rtd ATX104HR-EXPRESS, User Manual

Page: 8 / 43

ATX104HR-EXPRESS
User’s Manual
ATX104HR-EXPRESS 8 RTD Embedded Technologies, Inc.
Chapter 1
I
NTRODUCTION
This user’s manual describes the operation of the ATX104HR-EXPRESS power supply
unit for automotive and industrial applications.
Features
Some of the key features of the ATX104HR-EXPRESS include:

Wide input voltage range 8-32 V DC (36V absolute max)

No heat sink required with natural convection cooling
up to 45˚C,

83W total output power guaranteed with adequate cooling ,

Up to 91 %efficiency at full load

Dual phase construction to minimize input ripple current and improve step
response

Synchronized supplies to reduce switching stresses

Remote ON/OFF operation

ATX104HR-EXPRESS o3.3V, +5V, +12V, -12V, 5V STDBY

Four status LED's

Fully PC/104-EXPRESS compliant

Operating temperature range -40 to +85 C
The following paragraphs briefly describe the major features of the ATX104HR-
EXPRESS. A more detailed discussion is included in Chapter 3 (Hardware description).
The board installation is described in Chapter 2 (Board Installation).
Power Supply Unit Description
The ATX104HR-EXPRESS power supply unit offers a complete reliable power
subsystem for your sophisticated computer and peripherals. To improve reliability in
harsh environments, the ATX104HR-EXPRESS is designed using protection devices
against over voltages, noise spikes and reverse input voltage. The output current of the
+5V and the +3.3V converter is limited to 10A. These features allow reliable system
operation in distributed industrial installations.
A 5V STDBY supply, capable of 1A, is present so ATX compliant systems can be built on
this board. ATX support signals PS_ON# and PWR_ON allow software controlled
shutdown and power monitoring available for your CPU.
The +5V and the +3.3V computer power supplies are designed using high efficiency
switching regulators providing high output current (10A) with efficiency as high as (91 %)
under all conditions. The secondary peripheral power supplies are designed using +12V
and -12V converters that are supplied by the +5V DC/DC converter. Low component
count and extensive use of SMD technology ensures low weight and reliable operation.
Special care has been taken to reduce radiated and conducted emissions. Optimized