1 Introduction
The TPS40074EVM-001 evaluation module (EVM) is a synchronous buck converter providing a fixed 1.5-V
output at up to 15 A from a 12-V input bus. The EVM is designed to start up from a single supply, so no
additional bias voltage is required for start-up. The module uses the TPS40074 high frequency controller with
remote sense.
1.1 Description
The TPS40074EVM-001 is designed to use a regulated 12-V (between 10-V and 14-V) bus to produce a high
current, regulated 1.5-V output at up to 15 A of load current. The TPS40074EVM-001 is design to demonstrate
the TPS40074 in a typical regulated bus to low-voltage application while providing a number of test points to
evaluate the performance of the TPS40074 in a given application. The EVM can be modified to support output
voltages from 0.9 V to 3.3 V by changing a single resistor. The TPS40074EVM-001 has been built to the sample
application used in the
TPS40074 Midrange Input Synchronous Buck Controller With Voltage Feed-Forward
, except the switching frequency has been lowered to 400 kHz to reduce switching losses in the
power FETs, and the R
KFF
resistor (R10) increased to maintain the UVLO level.
1.2 Applications
• Non-isolated medium current point of load and low voltage bus converters
• Merchant power modules
• Networking equipment
• Telecommunications equipment
• DC power distributed systems
1.3 Features
• 10-V to 14-V input range
• 1.5-V fixed output, adjustable with single resistor
• 15-A
DC
steady state output current
• 400-kHz switching frequency
• Single main switch MOSFET and single synchronous rectifier MOSFET single
• Component side, surface mount design on a 3-inch × 3-inch evaluation board
• Four-layer PCB with all components on the top side
• Convenient test points for probing critical waveforms and non-invasive loop response testing
2 TPS40074EVM-001 Electrical Performance Specifications
Table 2-1. TPS40074EVM-001 Electrical and Performance Specifications
PARAMETER
NOTES AND CONDITIONS
MIN
TYP
MAX
UNIT
INPUT CHARACTERISTICS
Input voltage range
10
14
V
Max input current
V
IN
= 10 V, I
OUT
= 15 A
2.75
A
No-load input current
V
IN
= 14 V, I
OUT
= 0 A
45
mA
OUTPUT CHARACTERISTICS
Output voltage
R6 = 9.53 k, R5 = 105 k
1.45
1.50
1.55
V
Output voltage regulation
Line regulation (10 V < V
IN
< 14 V, I
OUT
= 5 A)
1%
Load regulation (10 V < I
OUT
< 15 A, V
IN
= 12 V)
1%
Output voltage ripple
V
IN
= 14 V, I
OUT
= 15 A
25
50
mVpp
Output load current
0
15
A
Output over current
23
A
SYSTEM CHARACTERISTICS
Switching frequency
360
400
440
kHz
Peak efficiency
V
OUT
= 1.5 V, 8 A < I
OUT
< 12 A
V
12V_IN
= 10 V
87%
V
12V_IN
= 12 V
85%
V
12V_IN
= 14 V
83%
Introduction
2
TPS40074 Buck Controller Evaluation Module User's Guide
SLUU231A – JUNE 2006 – REVISED JANUARY 2022
Copyright © 2022 Texas Instruments Incorporated
