Texas Instruments 10A, 12V Input, 1.8V Output Synchronous Buck Converter using the TPS40192 and NexFET MOSFETs TPS40192E TPS40192EVM-525 数据表
产品代码
TPS40192EVM-525
www.ti.com
Test Setup
By moving channel A from TP12 to TP6 (COMP), the control-to-output response of the power stage (also
referred to as the power-stage transfer function) can be directly measured. See Section 3.9 for a detailed
procedure of loop-response measurements.
referred to as the power-stage transfer function) can be directly measured. See Section 3.9 for a detailed
procedure of loop-response measurements.
3.3.6
Output Voltage Monitoring (TP15 and TP16)
TPS40192EVM-525 provides two test points for measuring the voltage generated by the module. This
allows the user to measure the actual module output voltage without losses from output cables and
connector losses. All output voltage measurements should be made between TP15 and TP16. To use
TP1 and TP2, connect a voltmeter positive terminal to TP15 and negative terminal to TP16. For output
ripple measurements, TP15 and TP16 allow a user to limit the ground loop area by using the tip and barrel
measurement technique shown in
allows the user to measure the actual module output voltage without losses from output cables and
connector losses. All output voltage measurements should be made between TP15 and TP16. To use
TP1 and TP2, connect a voltmeter positive terminal to TP15 and negative terminal to TP16. For output
ripple measurements, TP15 and TP16 allow a user to limit the ground loop area by using the tip and barrel
measurement technique shown in
. All output ripple measurements should be made using this
technique.
3.3.7
Power Good (TP17, TP18, and TP19)
TPS40192EVM-525 has three test points to allow the user to evaluate the TPS40192 power-good
function. TP18 provides access to the power-good output of the TPS40192. It has a 100-k
function. TP18 provides access to the power-good output of the TPS40192. It has a 100-k
Ω
pullup to the
TPS40192 5-V regulator and can be used as a logic signal with no additional requirements. TP17 provides
a connection for an external power-good source for 3.3-V logic. TP17 is connected to the power-good
circuit through a 10-k
a connection for an external power-good source for 3.3-V logic. TP17 is connected to the power-good
circuit through a 10-k
Ω
pullup resistor. TP19 provides a local ground access to connect a remote disable
circuit.
3.3.8
Prebias Input (TP20)
TPS40192EVM-525 contains a prebias injection circuit with a 100-
Ω
resistor and series diode to allow
testing and evaluation of the TPS40192's prebias support compatibility. Apply a voltage less than the
target output voltage to TP20. Monitoring the output voltage during start-up demonstrates the ability of the
TPS40192 to power up without drawing current from a prebiased output. D2 prevents the output voltage
from back-driving the prebias source.
target output voltage to TP20. Monitoring the output voltage during start-up demonstrates the ability of the
TPS40192 to power up without drawing current from a prebiased output. D2 prevents the output voltage
from back-driving the prebias source.
4
Test Setup
4.1
Equipment
4.1.1
Voltage Source
The input voltage source (V
IN
) should be a 0- to 15-V variable DC source capable of 5 Adc. Connect V
IN
to
J1 as shown in
4.1.2
Meters
A1: 0- to 5-Adc ammeter
V1: V
V1: V
IN
, 0- to 15-V voltmeter
V2: V
OUT
, 0- to 5-V voltmeter
4.1.3
Loads
The output load (LOAD1) should be an electronic constant-current mode load capable of 0 to 10 Adc at
1.8 V.
1.8 V.
7
SLUU395 – December 2009
Using the TPS40192EVM-525, A 12-V Input, 1.8-V Output, 10-A Synchronous
Buck Converter
Copyright © 2009, Texas Instruments Incorporated