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Summary of Contents for Texas Instruments TPS40001
- Page 1 User’s Guide TPS40001 Based Converter Delivers 10-A Output User’s Guide...
- Page 2 EVM IMPORTANT NOTICE Texas Instruments (TI) provides the enclosed product(s) under the following conditions: This evaluation kit being sold by TI is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION PURPOSES ONLY and is not considered by TI to be fit for commercial use. As such, the goods being provided may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including product safety measures typically found in the end product incorporating the goods.
- Page 3 EVM User’s Guide. When placing measurement probes near these devices during operation, please be aware that these devices may be very warm to the touch. Mailing Address: Texas Instruments Post Office Box 655303 Dallas, Texas 75265 Copyright 2003, Texas Instruments Incorporated...
- Page 4 This design note provides details on a buck converter that converts an input of 3 V to 5 V down to a 2.5-V output level utilizing either the TPS40000 or TPS40001 controller. A schematic for the board is shown in Figure 1. The list of material is provided in section 7 of this User’s Guide.
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Page 5: Sluu131A – September 2002 – Revised February
SLUU131A – September 2002 – Revised February 2003 Schematic Figure 1. Application Diagram for the TPS40002/3 TPS40001 Based Converter Delivers 10-A Output... -
Page 6: Design Procedure
Current Mode (DCM) operation or Continuous Current Mode (CCM) operation at lighter loads. In this reference design the TPS40001 is selected to maintain continuous mode operation down to zero load. If desired, the TPS40000 can be installed to turn the synchronous MOSFET off when the controller senses the inductor current reaching zero, indicating the circuit is entering the DCM of operation. - Page 7 SW pin 8 to be driven below ground several volts, possibly injecting substrate current which can cause improper operation of the device. A 3.3-Ω resistor has been placed in series with this pin to limit its excursion to safe levels. TPS40001 Based Converter Delivers 10-A Output...
- Page 8 The first pole is placed near the ESR zero frequency in equation (11), (11) and the second pole is placed at one-half the switching frequency at 150 kHz to allow a high-speed transient response, shown in equation (12). (12) TPS40001 Based Converter Delivers 10-A Output...
- Page 9 10 nF. R3 is empirically determined to be 2.2 Ω, which minimizes the ringing and overshoot at the switch node. With the relatively low input voltage of 5 V, the power loss, ½ CV f, is relatively small at 37 mW. TPS40001 Based Converter Delivers 10-A Output...
- Page 10 Instrument Literature Number SLMA002) should be consulted for more information on the PowerPADt package. This report offers in-depth information on the package, assembly and rework techniques, and illustrative examples of the thermal performance of the PowerPADt package. TPS40001 Based Converter Delivers 10-A Output...
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Page 11: Test Results/Performance Data
SLUP183A SCOPE VOUT Output wires 16 DVM2 gauge or larger, as short as feasible I OUT (–) LOAD (+) (–) Load adjustable from 0–10Amps Figure 4. Test Setup TPS40001 Based Converter Delivers 10-A Output... - Page 12 = 5 V and I =10 A. As the picture indicates, there is almost negligible body diode conduction using the Predictive Gate Drivet technique. TYPICAL SWITCH NODE WAVEFORM 2 V/div t – Time – 500 ns/div Figure 6. TPS40001 Based Converter Delivers 10-A Output...
- Page 13 – Time – 1 µs/div Figure 7. Figure 8 shows the transient response with a 50% load step from 2.5 A to 7.5 A. TRANSIENT RESPONSE 50 mV/div t – Time – 20 µs/div Figure 8. TPS40001 Based Converter Delivers 10-A Output...
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Page 14: Pcb Layout
SLUU131A – September 2002 – Revised February 2003 PCB Layout The PCB top assembly and copper layers are shown in Figures 9 through 11. Figure 9 Figure 10 Figure 11 TPS40001 Based Converter Delivers 10-A Output... -
Page 15: List Of Material
Red, 1 mm, 0.038”, 6400” Farnell 240–345 Adapter TP2, TP6 3.5-mm probe clip (or 131–5031–00), 72900 Tektronix 131–4244–00 JACK TP3, TP7 Black, 1mm, 0.038”,6400” Farnell 240–333 Device Low Input Voltage Mode, TPS40001DGQ Syncronous Buck Controller DGQ10 TPS40001 Based Converter Delivers 10-A Output... - Page 16 IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.
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