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Chapter 4

Power Supply

The power supply used in the BBS-2002 is a 45W AT power supply.

The specifications and features of this special power supply are listed

in the following sections.

4.1 Specifications

4.1.1 Input Specifications

Input Voltage: The range of input voltage is from 90VAC to 264VAC or

120VDC to 370VDC

Input Frequency: The range of input frequency is from 47HZ to 440HZ

Input Current: The maximum input current is 1A (RMS) at 115VAC

Inrush Current:

The cold inrush current will limit less than 50A at

264VAC input voltage

4.1.2 Output Specifications

Load Range: Voltage accuracy is set at full load. Maximum output power is

42.6W

Output Min. Load Rated Load Max. Load Voltage Accuracy

+5V

0.4A

3A

5A

4.85~5.15V

+12V

0.2A

2A

2.5A

11.52~12.48V

-12V

0A

0.3

0.5A

11.64~12.36V

Ripple and Noise: The peak to peak ripple and noise for +5V output is less

than 50mV, 120mV for +/-12V outputs. Measuring is done by 20MHz

bandwidth limited oscilloscope and terminated each output with a 0.1uF

ceramic capacitor and a 10uF electrolysis capacitor at rated load, nominal

line

Line Regulation: The line regulation for +5V and –12V is less than +/-1%,

+/-2% for +12V. Measuring at full load and from 100VAC to 240VAC input

voltage changing

Load regulation: The load regulation for +5V output is less than +/-3%,

+/-5% for +12V, and +/-1% for –12V. Measuring is measured from 60% to

100% and 60% to 20% with full load (60% +/-40% full load)