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TDS990 POWER SUPPLY
DESCRIPTION
This product is obsolescent and should not be used for
new designs with a long lifetime.
A universal power supply for microprocessor and other applications.
It provides three voltage supplies of +12V, +5V and -12V. The +12V supply is
adjustable to any other voltage in the range +7.5V to +15.5V. In addition, a
50Hz (or 60Hz) square wave clock derived from the line supply is provided for
microprocessor timing software. Use with either 110-120V or 220-240V line power.
The power supply is single Eurocard size 160 x 100mm and the connector is a
DIN 41612 type C. A 2 Amp fuse is fitted in the positive DC supply rail.
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TDS990 Power supply and TDS9099 Backplane
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CONNECTIONS
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Pin numbers
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Function
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a1
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c1
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+5V 1.7A less current being taken from +8V/+15V permissible).
1.0A max.
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a3
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c3
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+15V 0.6A Voltage adjustable by multiturn
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+12V 1.2A potentiometer at front of board
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+10V 1.7A
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+ 8V 1.8A
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a5
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c5
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LED indicator output. Provides a negative current of
about 15mA. Connect a Power On LED from this pin to a32/c32 if required
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a7
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c7
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PCB screen. Connect to ground
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a10
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c10
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First 120V Primary Input (live)
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a14
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c14
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First 120V Primary Input (neutral)
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a19
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c19
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Second 120V Primary Input (live)
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a23
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c23
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Second 120V Primary Input (neutral)
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a26
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c26
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PCB screen. Connect to ground
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a28
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c28
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Ground. Connected on the board to a32/c32
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a29
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c29
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-12V 0.5A (not fused on DC side)
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a31
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c31
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50Hz (or 60 Hz) square wave output, filtered to eliminate high frequency spikes so that correct timekeeping can be maintained
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a32
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c32
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Power Supply Common. Usually connect to ground.
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TDS990 circuit diagram
Click the diagram for more detail, or to save a copy:
1. in Internet Explorer right click on the picture and select "Save Target as..."
2. in Netscape double-click the picture to open the file, then under "File" select the "Save As" option.
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