Texas Instruments TPS22924EVM-532, User Manual

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Operation
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2.4 J2/J5 – V
IN
Sense and V
OUT
Sense
These two connectors are used when very accurate measurements of input or output voltage are required,
Ron measurements should be made using these sense connections and measuring the voltage drop from
VIN to VOUT and then calculating the resistance.
3 Operation
Connect the positive input of the power supply to the VIN J1 and the negative lead of the power supply to
GND J3. The input voltage range of the TPS22924 is 0.75 V to 3.6 V.
Output load can be applied by connecting between J4 VOUT and J6 GND. The TPS22924 is rated for a
maximum continuous current of 2A. Additional output load can be selected using JP6, JP7, and JP8.
Shorting across JP6 selects R1 an 36 ohm on board resistor. JP7 selects R2 an 11 ohm on board resistor.
JP8 selects R3 which is open for customer selection. R1, 2 and 3 are intended for light loads of the
output, observe the 1/8W power rating for these parts. Configure jumper JP3 as required. JP3 must be
installed for proper operation. ON is normal operation. While operating in the ON state the rise time of the
device is internally controlled to avoid inrush current. Different rise times are selected by device types as
shown above in
Table 1 . In the OFF position, the device is shut down and a 1250- Ω on-chip load resistor
is added for output quick discharge.
4 Test Results
See the Typical Characteristics section of the TPS22924 data sheet.
5 Board Layout, Schematic, and Bill of Materials
This section provides the TPS22924EVM-532 board layout, schematic, and bill of materials.
5.1 Board Layout
For best performance, all traces should be as short as possible. To be most effective, the input and output
capacitors should be placed close to the device to minimize the effects that parasitic trace inductances
may have on normal and short-circuit operation. Using wide traces for V
IN
, V
OUT
, and GND helps minimize
the parasitic electrical effects along with minimizing the case to ambient thermal impedance Figure 1 and
Figure 2 show the board layout for the TPS22924EVM-532 PCB.
2 TPS22924EVM-532 SLVU456A – May 2011 – Revised June 2011
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