Texas Instruments TPS51225 Evaluation Module TPS51225EVM-133 TPS51225EVM-133 데이터 시트
제품 코드
TPS51225EVM-133
TP7/TP8
TP2/TP3
Metal Ground Barrel
Probe Tip
Test Setup
4
Test Setup
4.1
Test Equipment
Voltage Source: The input voltage, Vin, should be a 0- to 20-V variable DC source capable of supplying
10 Adc. Connect Vin to J1 as shown in
10 Adc. Connect Vin to J1 as shown in
Multimeters:
V1: Vin at TP1 (Vin) and TP6 (GND).
V2: Vout1 at TP2 (Vout1) and TP7 (GND).
V3: Vout2 at TP3 (Vout2) and TP8 (GND).
A1: Vin input current
V1: Vin at TP1 (Vin) and TP6 (GND).
V2: Vout1 at TP2 (Vout1) and TP7 (GND).
V3: Vout2 at TP3 (Vout2) and TP8 (GND).
A1: Vin input current
Output Load: The output load should be an electronic constant resistance mode load capable of 0 to 15
Adc.
Adc.
Oscilloscope: A digital or analog oscilloscope can measure the output ripple. Set the oscilloscope for 1-
M
M
Ω
impedance, 20-MHz Bandwidth, AC coupling, 4 µs/division horizontal resolution, 50-mV/division
vertical resolution. Use test points TP2(Vout1), TP3(Vout2), TP7(GND), and TP8(GND) for measuring the
output ripple voltage by placing the oscilloscope probe tip through TP2/TP3 and holding the ground barrel
on TP7/TP8 as shown in
output ripple voltage by placing the oscilloscope probe tip through TP2/TP3 and holding the ground barrel
on TP7/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 Vout Ripple
Fan: Some of the components in this EVM may approach temperatures of 60ºC during operation. A small
fan capable of 200–400 linear feet per minute (LFM) is recommended to reduce component temperatures
while the EVM is operating. Do not probe the EVM while the fan is not running.
fan capable of 200–400 linear feet per minute (LFM) is recommended to reduce component temperatures
while the EVM is operating. Do not probe the EVM while the fan is not running.
Recommended Wire Gauge:
1. Vin to J1(12-V input):
The recommended wire size is 1x American wire gauge (AWG) #14 per input connection, with the total
length of wire less than 4 feet (2 feet input, 2 feet return).
length of wire less than 4 feet (2 feet input, 2 feet return).
2. J2, J3 to Load1, Load2:
The minimum recommended wire size is AWG #14, with the total length of wire less than 4 feet (2 feet
output, 2 feet return)
output, 2 feet return)
5
SLVU735 – June 2012
Dual Synchronous Step-Down Fixed Output Controller with 5-V and 3.3-V
LDOs
Copyright © 2012, Texas Instruments Incorporated