1 Introduction
The TPS40190EVM-001 evaluation module (EVM) is a synchronous buck converter providing a fixed 1.5-V
output at up to 10 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 TPS40190 reduced pin count synchronous
buck controller.
1.1 Description
The TPS40190EVM-001 is designed to use a regulated 12-V (10 V–14 V) bus to produce a high current,
regulated 1.5-V output at up to 10-A of load current. The TPS40190EVM-001 is design to demonstrate the
TPS40190 in a typical regulated bus to low-voltage application while providing a number of test points to
evaluate the performance of the TPS40190 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 set resistor.
1.2 Applications
• Non-isolated medium current point of load and low voltage bus converters
• 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
• 10 A
DC
steady state output current
• 300-kHz switching frequency (fixed by the TPS40190)
• Single main switch N-channel MOSFET and single synchronous rectifier N-channel MOSFET
• Double sided 3-inch × 3-inch PCB with all components on top side
• Active converter uses less than 1.2 square inches – 1.775 × 0.670
• Convenient test points for probing critical waveforms and non-invasive loop response testing
2 TPS40190EVM-001 Electrical Performance Specifications
Table 2-1. TPS40190EVM-001 Electrical and Performance Specifications
Parameter
Notes and Conditions
Min
Typ
Max
Units
Input Characteristics
Input voltage range
10
14
V
Max input current
V
IN
= 10 V, I
OUT
= 10 A
2
A
No-load input current
V
IN
= 14 V, I
OUT
= 0 A
100
mA
Output Characteristics
Output voltage
R6 = 6.49 k, R5 = 10 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 (< 0 A < I
OUT
< 10 A, V
IN
= 12 V)
Output voltage ripple
V
IN
= 14 V, I
OUT
= 10 A
25
50
mVpp
Output load current
0
10
A
Output over current
23
A
System Characteristics
Switching frequency
240
300
360
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
Full load efficiency
V
OUT
= 1.5 V, I
OUT
= 15 A
V
12V_IN
= 10 V
84
%
V
12V_IN
= 12 V
83
V
12V_IN
= 14 V
81
Introduction
2
TPS40190 Buck Controller Evaluation Module User's Guide
SLUU232A – SEPTEMBER 2005 – REVISED JANUARY 2022
Copyright © 2022 Texas Instruments Incorporated
