Техническая Спецификация для Texas Instruments 8-14V Vin, 1.8V Vout Synchronous Buck Converter Evaluation Module for TPS40305 TPS40305EVM-488 TPS40305EVM-488
Модели
TPS40305EVM-488
www.ti.com
Test Set Up
5.1.3
Loads
LOAD1: — Output load. Electronic load set for constant current or constant resistance capable of 0Adc –
10Adc at 1.8Vdc
10Adc at 1.8Vdc
5.1.4
Oscilloscope
For Output Voltage Ripple: — Oscilloscope shall be an analog or digital oscilloscope set for ac coupled
measurement with 20-MHz bandwidth limiting. Use 20mV / division vertical resolution, 200ns/division
horizontal resolution.
measurement with 20-MHz bandwidth limiting. Use 20mV / division vertical resolution, 200ns/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 2V/division or 5V/division vertical resolution and
200ns/division horizontal resolution.
measurement with 20-MHz bandwidth limiting. Use 2V/division or 5V/division vertical resolution and
200ns/division horizontal resolution.
5.1.5
Recommended Wire Gauge
VIN to J1: — The connection between the source voltage (VIN) and J1 of TPS40305EVM-488 can carry
as much as 2.5Adc 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).
as much as 2.5Adc 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 (VIN) and J1 of TPS40305EVM-488 can
carry as much as 10Adc of current. The minimum recommended wire size is AWG #14 with the total
length of wire less than 2 feet (1 foot input, 1 foot return).
carry as much as 10Adc of current. The minimum recommended wire size is AWG #14 with the total
length of wire less than 2 feet (1 foot input, 1 foot return).
5.1.6
Other
FAN: — The TPS40305EVM-488 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, a small
fan capable of 200lfm – 400lfm is recommended to reduce component temperatures when operating.
when operating. Because this evaluation module is not enclosed to allow probing of circuit nodes, a small
fan capable of 200lfm – 400lfm is recommended to reduce component temperatures when operating.
5.2
Equipment Setup
Shown in
is the basic test set up recommended to evaluate the TPS40305EVM-488. Note that
although the return for J1 and JP2 are the same system ground, the connections should remain separate
as shown in
as shown in
.
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.
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 3.0A
maximum. Make sure V
IN
is initially set to 0V and connected as shown in
3. Connect VIN to J1 as shown in
4. Connect ammeter A1 between VIN and J1 as shown in
5. Connect voltmeter V1 to TP1 and TP2 as shown in
6. Connect voltmeter V2 to TP3 and TP4 as shown in
7. Connect oscilloscope probes to desired test points per
8. Place fan as shown in
and turn on making sure to blow air directly across the evaluation
module.
7
SLUU406 – February 2010
TPS40305EVM-488
Copyright © 2010, Texas Instruments Incorporated