Texas Instruments Evaluation Module for TPS51217 20A Synchronous Step Down Controller with DCAP™ Mode TPS51217EVM-533 TPS51217EVM-533 데이터 시트
제품 코드
TPS51217EVM-533
TP7
TP8
www.ti.com
Test Setup
4
Test Setup
4.1
Test Equipment
Connect test equipment and TPS51125AEVM board as shown in
.
4.1.1
Voltage Source
The input voltage source VIN should be a variable DC source between 0 V and 20 V capable of supplying
10 Adc. Connect VIN to J3 as shown in
10 Adc. Connect VIN to J3 as shown in
. The input voltage source V5IN should be variable DC
source between 0 V and 5.5 V capable of supplying 1 Adc. Connect V5IN to J1 and J2 as shown in
4.1.2
Multimeters
A voltmeter between 0 V and 21 V should be used to measure VIN at TP5 (VIN) and TP6 (VIN_GND). A
voltmeter betwen 0 V and 7 V should be used to measure V5IN at TP1 (V5IN) and TP2 (V5IN_GND). A
voltmeter betwen 0 V and 5 V should be used to measure VOUT at TP7(VOUT) and TP8 (VOUT_GND). A
current meter between 0 A and 10 A (A1) as shown in
voltmeter betwen 0 V and 7 V should be used to measure V5IN at TP1 (V5IN) and TP2 (V5IN_GND). A
voltmeter betwen 0 V and 5 V should be used to measure VOUT at TP7(VOUT) and TP8 (VOUT_GND). A
current meter between 0 A and 10 A (A1) as shown in
is used for VIN input current
measurements. A current meter between 0 A and 1 A (A2) as shown in
is used for V5IN input
current measurements.
4.1.3
Pulse Generator
A dual-channel pulse generator capable of 250 Hz, 3.3 V
P-P
pulse output should be used.
4.1.4
Output Load
The output load should be an electronic constant resistance mode load capable of between 0 Adc and 30
Adc at 0.9 V to 1.2 V.
Adc at 0.9 V to 1.2 V.
4.1.5
Oscilloscope
A digital or analog oscilloscope can be used to measure the output ripple. The oscilloscope should be set
for 1 M
for 1 M
Ω
impedance, 20 MHz bandwidth, AC coupling, 2 µs/division horizontal resolution, 50 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
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 2. Tip and Barrel Measurement for Output Voltage Ripple
4.1.6
Fan
Some of the components in this EVM may approach temperatures of 60°C during operation. A small fan
capable of between 200 LFM and 400 LFM is recommended to reduce component temperatures while the
EVM is operating. The EVM should not be probed while the fan is not running.
capable of between 200 LFM and 400 LFM is recommended to reduce component temperatures while the
EVM is operating. The EVM should not be probed while the fan is not running.
5
SLUU420 – MAY 2010
Using the TPS51217EVM-533, High-Performance, Single-Synchronous
Step-Down Controller for Notebook Power Supply
Copyright © 2010, Texas Instruments Incorporated