Datasheet

RSET

OFF

470.02

V 0.00314

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LED Indicators

3.9 RSET

RSET is usually used in TPS2411 and sometimes in the TPS2410 to program the MOSFET turn-off point.

The RSET calculation from the data sheet is:

(1)

Calculate the RSET resistor. For the PS1 channel, remove jumper J3 and connect an ohm-meter from

J3-2 to GND. Adjust pot R8 for the calculated resistance value. Install the jumper J3-1, 2. Repeat for the

PS2 channel RSET Pot R26 and jumper J15. The component reference designators for each channel is

summarized in Table 6.

Table 6. RESET Resistor Setting

RSET Pot Jumper Measure

R8 J3 J3-2

R26 J15 J15-2

3.10 Test Methods

The EVM has many operating configurations to view the system response. The user can make

modifications to the EVM jumpers and test other set ups.

3.11 Adjust Input Power Supplies

Vary the input voltages to observe system behavior. Jumpers can be set as in Table 2. Turn the power

supplies to the application typical volts; for this paper, we will use 12 V. The load is shared between the

supplies. Both gates will be on and the power supply current meters show output. Decrease one supply

voltage slightly and note the gate on that channel pass FET turn off and the other channel FET gate

increases to keep the FET on to supply the load. Observe the FET gates with a scope. With a voltmeter,

verify V

for the on channel to be tens of millivolts.

3.12 Glitch Maker

Remove the jumper from J5 to J12 and connect the power supply to J12. This reduces the bulk

capacitance at the PCB power supply input. Set power supplies up for equal or slight differential voltage

so that the PS1 supply is contributing to the load. Press momentary switch S1, labeled PULSE. The switch

closure places a 1-Ω load across the input power supply for 100 μs. Observe the effect of an input power

supply glitch. Scope on the MOSFET gates, load voltage, TPS2410 fault output, STAT, PG.

3.13 Load Change

A dynamic change to the load can be made by switching additional load on or off with an external switch.

Some power load test equipment can be used to dynamically change the load.

SLVU181A– October 2006– Revised February 2012 TPS2410 EVM (HPA204)

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