Texas Instruments Dual Phase Eco-Mode™ Step Down Converter for 40A+ Appllications using the TPS51727 TPS51727EVM TPS51727EVM Fiche De Données
Codes de produits
TPS51727EVM
TP8
TP7
Metal Ground Barrel
Probe Tip
Test Setup
www.ti.com
4
Test Setup
4.1
Test Equipment
Voltage Source: The input voltage source Vin must be a 0-V to 14-V variable dc source capable of
supplying 20 Adc. Connect Vin to J2 as shown in
supplying 20 Adc. Connect Vin to J2 as shown in
Multimeters: A 0-V to 14-V voltmeter must be used to measure Vin at TP5 (Vin) and TP6 (GND). A 0-V to
5-V voltmeter must be used for Vout measurement at TP7(Vout) and TP8(GND). A 0-A to 20-A current
meter (A1) as shown in
5-V voltmeter must be used for Vout measurement at TP7(Vout) and TP8(GND). A 0-A to 20-A current
meter (A1) as shown in
is used for input current measurements.
Output Load: The output load must be an electronic constant resistance mode load capable of 0 A to 50
Adc at 1.5 V.
Adc at 1.5 V.
Oscilloscope: A digital or analog oscilloscope can be used to measure the output ripple. The oscilloscope
must be set for 1-M
must be set for 1-M
Ω
impedance, 20-MHz bandwidth, ac coupling, 1-µs/division horizontal resolution,
20-mV/division vertical resolution. Test points TP7 and TP8 can be used to measure the output ripple
voltage by placing the oscilloscope probe tip through TP7 and holding the ground barrel TP8 as shown in
voltage by placing the oscilloscope probe tip through TP7 and holding the ground barrel TP8 as shown in
. Using a leaded ground connection may induce additional noise due to the large ground loop.
Figure 3. Tip and Barrel Measurement for Vout Ripple
Fan: Some of the components in this EVM may get hot and approach temperatures of 60ºC during
operation. A small fan capable of 200-400 LFM is recommended to reduce component temperatures while
the EVM is operating. The EVM must not be probed while the fan is not running.
operation. A small fan capable of 200-400 LFM is recommended to reduce component temperatures while
the EVM is operating. The EVM must not be probed while the fan is not running.
Recommended Wire Gauge: For VIN to J2(12-V input) the recommended wire size is 2x AWG 14 per
input connection, with the total length of wire less than 4 feet (2-foot input, 2-foot return). For J3, J4 to
LOAD, the minimum recommended wire size is 4x AWG 14, with the total length of wire less than 4 feet
(2-foot output, 2-foot return).
input connection, with the total length of wire less than 4 feet (2-foot input, 2-foot return). For J3, J4 to
LOAD, the minimum recommended wire size is 4x AWG 14, with the total length of wire less than 4 feet
(2-foot output, 2-foot return).
6
Using the TPS51727EVM, a Dual-Phase, Eco-mode™ Step-Down Power
SLUU379 – November 2009
Management IC for 40-A+ Application
Copyright © 2009, Texas Instruments Incorporated