Datasheet

Setup of the EVM
1-6
Figure 1–4. Top Layer of the Interface Card, and Placement of Components
Top Layer
Top Assembly
1.4 Setup of the EVM
For proper operation of the EVM, follow these steps for dual hot-swap evalua-
tion:
1) Verify that the power-supply voltages are in the required ranges:
3 V < Supply #1 < 13 V; 3 V < Supply #2 < 5.5 V. Make sure the supplies
have the capability to supply the current that the loads need. Turn off the
supplies.
2) Plug the supplies into the interface card: connect Supply #1 to IN1, and
Supply #2 to IN2. Turn on both power supplies.
3) Loads can be connected to the outputs (between OUT1 and GND, and be-
tween OUT2 and GND) of the hot-swap board if users want to simulate
resistive or current loads. However, users can test a number of character-
istics of the controller without external loads.
Because the sense resistor on the EVM is 0.01 Ω, and the current-limit-setting
resistor is 510 Ω, the maximum dc current each channel can supply is (refer
to TPS2300/TPS2301 data sheet):
I
LMT 1
R
SET 1
50 10
– 6
R
S 1
510 50 10
– 6
0.01
2.55 A
But, the actual current it can pass will be lower than 2.55 A since the contact
resistance and PCB trace resistance cannot be neglected compared to the
0.01 Ω. Considering the effect of these resistances, the actual current limits for
both channels are about 1.4 A for the present settings on the hot-swap board.