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User's Guide
SLUU208 – October 2004
12-V Input, 1.5-V Output, 40-A Two Phase Synchronous
Buck Converter Using the TPS40130
The TPS40130EVM-001 evaluation module (EVM) is a high efficiency, two phase
synchronous buck converter providing a fixed 1.5-V output at up to 40 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 TPS40130 high frequency two
phase controller.
Contents
1 Description ........................................................................................... 2
2 TPS40130EVM-001 Electrical Performance Specifications ................................... 3
3 Schematics .......................................................................................... 4
4 Test Setup ........................................................................................... 7
5 TPS40130EVM-001 Typical Performance Data and Characteristic Curves............... 10
6 EVM Assembly Drawings and Layout .......................................................... 12
7 List of Materials .................................................................................... 16
List of Figures
1 TPS40130EVM-001 Power Stage/Control Schematic ......................................... 4
2 TPS40130EVM-001 Support Circuitry Schematic .............................................. 5
3 TPS40130EVM-001 Recommended Test Setup ............................................... 9
4 TPS40130EVM-001 Efficiency, V
12V_IN
= 10 V to 14 V,
V
1V5_OUT
= 1.5 V, I
1V5_OUT
= 4 A to 40 A ........................................................ 10
5 TPS40130EVM-001 Line Regulation, I
1V5_OUT
= 20 A ........................................ 10
6 TPS40130EVM-001 Load Regulation .......................................................... 11
7 TPS40130EVM-001 5 A to 55 A Transient Response, 5 A to 55 A at 3 A/µs,
I
1V5_OUT (10A/div)
, V
1V5_OUT(rip)
(20 mv/div), Time 10 µs/div ...................................... 11
8 TPS40130EVM-001 55 A to 5 A Transient Response, 55 A to 5 A at 3 A/µs,
I
1V5_OUT (10A/div)
, V
1V5_OUT(rip)
(20 mV/div), Time 10 µs/div ..................................... 12
9 TPS40130EVM-001 Component Placement (Top View) .................................... 13
10 TPS40130EVM-001 Silkscreen (Top View) ................................................... 13
11 TPS40130EVM-001 Top Copper (Top View) .................................................. 14
12 TPS40130EVM-001 Layer 2 (X-Ray Top View)............................................... 14
13 TPS40130EVM-001 Layer 3 (X-Ray Top View)............................................... 15
14 TPS40130EVM-001 Bottom Copper (X-Ray Bottom View) ................................. 15
List of Tables
1 TPS40130EVM-001 Electrical and Performance Specifications ............................. 3
2 Adjusting V
1V5_OUT
With R14 ...................................................................... 6
3 Adjusting Overcurrent Protection with R19 ...................................................... 6
4 TPS40130EVM-001 Bill of Materials ........................................................... 16
12-V Input, 1.5-V Output, 40-A Two Phase Synchronous Buck Converter Using the TPS40130SLUU208 – October 2004 1
