Tri-M Systems technical manual Power Considerations, HE104 Connectors

23 June 2005

HE104MAN-V8 Manual

2.2 Power Considerations

Usable +5V output =10A – (I [-5] + I [-12]∙ 2.4 + I [12] ∙ 2.4) 0.8

The +5V switching regulator is rated at 10A maximum output however, the +5V output, supplies power to the +12VDC, -5VDC and –12VDC regulators. To obtain the usable range of +5V output, “derate” according to the use of +12VDC, -5VDC and –12VDC. Use the following formulae to calculate the maximum usuable output.

Where: I[-5] = -5VDC current load

I[-12] = -12VDC current load

I[12] = 12VDC current load

Assuming 90 percent convertor efficiency (actual efficiency may vary).

2.3HE104 Connectors

2.3.1Main Input Power Connector

Input power is connected to the “pluggable” block, CN1, which is removable from the socket connector on the circuit board. The power supply accepts DC input voltages in the range of 6VDC to 40VDC.

Unregulated vehicle power is connected as follows:

-Terminal 1: “hot” polarity

-Terminal 2: Common (0VDC)

!! CAUTION !!

To allow operation at the lowest possible input voltages (6VDC) and for the best efficiency, there is no input Reverse Polarity Diode (RPD) provided on the HE104 without a battery charger option. If input RPD is required, add RPD to the HE104 part number:

-Example HE 104-512-16-RPD

Note: Adding the RPD results in an increased power loss. For heat dissipation estimation please refer to section 2.11.

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