www.ti.com

2.1.6

JP2 –SYNC/PS

2.2

Setup

2.3

Power Up

ENPin

VOUT1V/div

2.4

Output Ripple

Setup and Results

Center pin is SYNC input, and is used to synchronize the unit with an external clock. Also, in power-saving

mode, 1=disabled and 0=enabled. Shorting jumper JP2 between the center pin and VIN disables

power-saving mode; jumper between center pin and GND enables power-saving mode.

To operate the EVM, simply connect an input supply to the appropriate pins, connect a load to the

appropriate pins. Maximum recommended load is 600 mA or 5.5

Ω. Input supply voltage of 3.0 V to 5.5 V

is recommended.

The soft-start circuit is controlled by a ramp to the current limit comparator that starts the switch current

limit low and increases it to 1.7 A. Output voltage is monitored during this time and must increase for

switch current to increase.

Figure 1. Turn ON into Electronic Load

Output ripple occurs at the switching frequency of 1 MHz, and with the recommended L and output C, is

low. Amplitude of the ripple varies, depending on load current and input voltage. Ensure the oscilloscope

probe is connected as close as possible to the output capacitor, with a very short ground lead, for

accurate measurements. Resistance in trace and leads adds to output ripple, and ground lead length

increases the amplitude of switching spikes.

SLVU156 – March 2006

TPS63000EVM-148

3

Submit Documentation Feedback