Datasheet

7.2 Connecting Loads to the TPS2459EVM
www.ti.com EVM Feature Details
Both output power rails of the TPS2459EVM are 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 TPS2459EVM provides up to 150 µ F capacitance on the Management power output, in
accordance with the AdvancedMC™ maximum limit. The EVM also provides up to 880 µ F of capacitance
on the Payload Power rail, 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 7 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 7. EVM On-Board Loads
OUTPUT RAIL JUMPER DEVICE VALUE
SLOT_MP J15 C11 150 F
J14 R6 270 Ω
SLOT_PWR J12 C7, C8 440 F
J13 C9, C10 440 F
J11 R5 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.
SLUU349 – March 2009 TPS2459 Full-Featured AdvancedMC™ Slot Controller Evaluation Module 15
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