Texas Instruments Evaluation Module Converts 12V Bus to 1.8V at 15 Amps TPS40055EVM-001 TPS40055EVM-001 데이터 시트
제품 코드
TPS40055EVM-001
SLUU186 − March 2004
4
TPS40055-Based Design Converts 12-V Bus to 1.8 V at 15 A (HPA070)
TPS40055-Based Design Converts 12-V Bus to
1.8 V at 15 A (HPA070)
Mark Dennis
System Power
Contents
1
Introduction
4
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2
Features
4
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3
Schematic
5
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4
Component Selection
6
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5
Test Setup
10
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6
Test Results and Performance Data
11
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7
EVM Assembly Drawing and PCB Layout
12
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8
List of Materials
15
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9
References
16
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1
Introduction
In many modern electronic applications there is a growing demand for circuits to convert a12-V bus to digital
voltages as low as, but not limited to 1.8 V. The current requirements can range from below 1 A to over 15 A.
For high-efficiency and small circuit size the TPS40055 wide-input synchronous buck controller can be used
to provide the necessary control and drive functions to implement these converters. The TPS40055EVM−001
operates at 300 kHz and delivers 1.8 V at 15 A with efficiency over 90% for much of the load range, and a full
load efficiency of 88%.
voltages as low as, but not limited to 1.8 V. The current requirements can range from below 1 A to over 15 A.
For high-efficiency and small circuit size the TPS40055 wide-input synchronous buck controller can be used
to provide the necessary control and drive functions to implement these converters. The TPS40055EVM−001
operates at 300 kHz and delivers 1.8 V at 15 A with efficiency over 90% for much of the load range, and a full
load efficiency of 88%.
The TPS40055 synchronous buck controller offers a variety of user programmable functions such as operating
frequency, soft-start time, voltage feed-forward, high-side current limit, and external loop compensation. This
controller also provides a regulated 10-V bias voltage which supplies onboard drivers for the N-channel switch
and synchronous rectifier MOSFETs, utilizing adaptive gate drive logic to prevent cross conduction of the power
MOSFETs.
frequency, soft-start time, voltage feed-forward, high-side current limit, and external loop compensation. This
controller also provides a regulated 10-V bias voltage which supplies onboard drivers for the N-channel switch
and synchronous rectifier MOSFETs, utilizing adaptive gate drive logic to prevent cross conduction of the power
MOSFETs.
[1]
2
Features
The specification of this design is as follows:
D
92% peak efficiency at 6 A
D
88% peak efficiency at 15 A
D
1.8V output at 15 A
D
V
IN
range from 10 V
DC
to 14 V
DC
D
Small circuit size 1.4” x 2.5” SMT design, components on single side
D
Line/load regulation < 0.5%
D
High-frequency 300-kHz operation
D
Transient deviation 60 mV with 10-A load step