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23 June 2005 HE104MAN-V8 Manual
Tri-M Engineering Tel: 800.665.5600, 604.945.9565
1407 Kebet Way, Unit 100 Fax: 604.945.9566
Port Coquitlam, BC V3C 6L3 E-mail: info@tri-m.com
Canada Web site: www.tri-m.com
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CHAPTER 1: INTRODUCTION
1.1 GENERAL DESCRIPTION
The HE104 multiple output DC to DC 50 watt converter is a high efficiency, high performance unit
that can be supplied with +5V, +12V outputs only or can include features such as, Power
Management, Universal Battery Charger, AC Bus termination, -5V output, -12V output and custom
output voltages from -42V to +42V. The HE104 is designed for low noise embedded PC/104
computer systems, which has a wide input range of 6 to 40V(>6:1) and is ideal for battery or
unregulated input applications. The HE104 is specifically designed for vehicular applications and has
heavy-duty transient suppressors (5000W) that clamp the input voltage to safe levels. Further, it is
able to maintain normal power supply operation.
The HE104 is a state-of-the-art MOSFET based design that provides outstanding line and load
regulation with efficiencies up to 95 percent. Organic Semiconductor Capacitors provide filtering,
which reduces ripple noises below 20mV. The low noise design makes the HE104 ideal for use
aboard aircraft, military applications or wherever EMI or RFI must be minimized. The +5VDC and
+12VDC outputs are controlled by a constant off-time current mode architecture regulator, which
provides excellent line and load transient response.
The +12VDC boost regulator uses the +5VDC as input power, so it can operate without dropout from
6 to 40V input and supply 2A. The +5VDC output is protected from output shorts by a high-speed
pulse-by-pulse current limit circuit. Furthermore, +12VDC output is protected from shorts by the
current limiting of the +5VDC controller.
A “plug-in” Universal Battery Charger (BC104) is available for the HE104 to charge Lead-Acid, NiCd
and NiMH batteries. Charge currents can be up to1.5A and battery charging voltages range from 6 to
40V.
The Power Management controller (PM104) allows for timed on/off control of the HE104, bus
interrupts on impending power failure, current limit setting and intelligent charge termination for the
BC104.
The HE104 is provided in a PC/104 form factor compliant size, which includes the 8bit and 16bit
PC/104 expansion bus header. All generated voltages are provided to their related power supply pins
on the PC/104 expansion bus and are available for off-board use through a screw terminal block.
PC/104 AC bus termination is an option that is available on the HE104,that provides the cleanest
possible signals on the PC/104 bus.
The HE104 can be configured to meet almost any power supply need for embedded PC/104
applications. This could be a simple +5V application, which provides for back lighted LCD panels or
a full UPS (un-interruptible power supply configuration).