Texas Instruments TPS40345EVM-353, Руководство пользователя, Страница: 7 / 23

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Test Setup
7 SNVU588 – November 2017
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TPS40345EVM-353 Evaluation Module
5 Test Setup
5.1 Equipment
5.1.1 Voltage Source
V
IN
— The input voltage source (V
IN
) must be a 0-V to 15-V variable DC source capable of supplying 5
Adc.
5.1.2 Meters
A1: — Input current meter. 0 Adc – 5 Adc ammeter
V1: — Input voltage meter. 0 V – 15 V voltmeter
V2: — Output voltage meter. 0 V – 2 V voltmeter
5.1.3 Load
LOAD1: — Output load. Electronic load set for constant current or constant resistance capable of 0 Adc –
20 Adc at 1.2-Vdc.
5.1.4 Oscilloscope
For output voltage ripple: — Oscilloscope must be an analog or digital oscilloscope set for ac-coupled
measurement with 20-MHz bandwidth limiting. Use 20 mV/division vertical resolution, 1-µs/division
horizontal resolution.
For switching waveforms: — Oscilloscope shall be an analog or digital oscilloscope set for dc coupled
measurement with 20-MHz bandwidth limiting. Use 2 V/division or 5V/division vertical resolution and 1-
µs/division horizontal resolution.
5.1.5 Recommended Wire Gauge
VIN to J1: — The connection between the source voltage (V
IN
) and J1 of TPS40345EVM-353 can carry as
much as 3.5 Adc of current. The minimum recommended wire size is AWG #16 with the total length of
wire less than 2 feet (1 foot input, 1 foot return).
J2 to LOAD1: — The connection between the source voltage (V
IN
) and J1 of TPS40345EVM-353 can
carry as much as 20 Adc of current. The minimum recommended wire size is AWG #12 with the total
length of wire less than 2 feet (1 foot input, 1 foot return).
5.1.6 Other
FAN: — The TPS40345EVM-353 evaluation module includes components that can get hot to the touch
when operating. Because this evaluation module is not enclosed to allow probing of circuit nodes, TI
recommends a small fan capable of 200 lfm – 400 lfm to reduce component temperatures when operating.
5.2 Equipment Setup
Shown in Figure 2 is the basic test set up recommended to evaluate the TPS40345EVM-353. Note that
although the return for J1 and JP2 are the same system ground, the connections should remain separate
as shown in
Figure 2 .
5.2.1 Procedure
1. Working at an ESD workstation, make sure that any wrist straps, bootstraps, or mats are connected
referencing the user to earth ground before power is applied to the EVM. Electrostatic smock and
safety glasses should also be worn.
2. Prior to connecting the dc input source, V
IN
, it is advisable to limit the source current from V
IN
to 4 A,
maximum. Make sure V
IN
is initially set to 0 V and connected as shown in Figure 2 .
3. Connect VIN to J1 as shown in Figure 2 .