Texas Instruments Dual-Slot ATCA AdvancedMC TPS2358, Руководство пользователя, Страница: 14 / 23

7.2 Connecting Loads to the TPS2358EVM
EVM Feature Details
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Each of the four power rails of the TPS2358EVM is supplied with some amount of load capacitance in the
form of discrete electrolytics. The capacitors can be connected to or disconnected from their associated
output nodes using 100-mil, 2-pin shunt jumpers across the on-board PCB headers. These capacitors are
intended to simulate input bulk capacitance which may be encountered at the front ends of
AdvancedMC™ modules plugged into the card slots of the target application. The AdvancedMC™
standard specifies the maximum allowable input capacitance on both Management and Payload Power
rails. The TPS2358EVM provides up to 150
µ
F capacitance on each of the two Management Power
outputs, according to the AdvancedMC™ maximum limit. The EVM also provides up to 880
µ
F of
capacitance, implemented in increments of 220
µ
F devices, on each of the Payload Power rails, to
approximate the 800
µ
F limit of the standard. In addition, low-level (mA) load resistors can be jumpered in
across each output and return. These limited load resistors are intended primarily as reset devices
between output ramp events, particularly when loaded with significant capacitance.
Table 8 lists the EVM module’s output voltage nodes, and for each one indicates the associated jumper
reference designators, and the resultant load value with jumper installed.
Table 8. EVM On-board Loads
OUTPUT RAIL JUMPER DEVICE VALUE
SLOTA_MP J30 C16 150
µ
F
J29 R12 270
Ω
SLTB_MP J32 C21 150
µ
F
J31 R13 270
Ω
SLOTA_PWR J25 C12 220
µ
F
J26 C13 220
µ
F
J27 C14 220
µ
F
J28 C15 220
µ
F
J24 R10 1 k
Ω
SLOTB_PWR J34 C17 220
µ
F
J35 C18 220
µ
F
J36 C19 220
µ
F
J37 C20 220
µ
F
J33 R11 1 k
Ω
Banana jacks are provided along the right-hand edge of the board for connection of the user’s optional
test loads. The output banana jack reference designators are listed in
Table 4 along with the voltage rail
available at each one. Also, the net names are screen printed on the PCB, adjacent to their respective
jacks.
TPS2358 Dual-Slot ATCA™ AdvancedMC™ Controller Evaluation Module 14 SLUU328 – August 2008
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