Datasheet

Power Supply
7–323 GTLP EVM Board Typical Test and Setup Configuration
2.5 Power Supply
The power supply (see Figure 2–8) is a universal power supply that accepts
100 V to 240 V, 50/60-Hz ac and uses any wall plug that connects to the IEC
320 two-connector universal socket with the US/Canada Edison plug. An
alternate supply cord with a different wall plug must be procured locally, if
required.
The power-supply output is 24-Vdc at 2.1 A, which is fed to the backplane
board using the 5.5-mm plug to J5 (see Figure 2–8), and connects through a
2.5-A slow-blow fuse (F1). Power should not be applied to the backplane board
until the cards have been inserted during the initial setup because the clock
card is not hot insertable. The termination, daughter cards, and clock crystals
are live insertable and can be inserted and removed to change position/values
during testing without disconnecting the power supply.
Figure 2–8. Power Supply (Left) and Backplane Connection (Right)
The 24-Vdc is reduced to 5 V, 1 A by the Lambda PM10-24S05 switching
regulator (Figure 2–8 background) and to 3.3 V, 7.5 A by the Lambda
PM30-24503 switching regulator (Figure 2–8 foreground) for V
CC
, BIAS V
CC
,
and the linear regulator. The 3.3 V is supplied to all connectors through a 5-A
fuse (F2). The 5 V also is applied to all connectors. Originally, F2 was specified
as a 3.5-A fuse, but, at 100-MHz operation, current exceeds this value, so 5-A
fuses are necessary.