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Texas Instruments TPS40003 manual

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Table of contents for the manual

  • Page 1

    User ’s Guide TPS40003 Based 5–A Converter in Less Than One Square Inch User ’ s G uide[...]

  • Page 2

    2 EVM IMPORT ANT NOTICE T exas 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 EV ALUA TION PURPOSES ONL Y and is not considered by TI to be fit for commercial use. As such, the goods being provided may not be complete in terms [...]

  • Page 3

    3 DYNAMIC W ARNINGS AND RESTRICTIONS It is important to operate this EVM within the input voltage range of 0 V to 5.5 V . Exceeding the specified input range may cause unexpected operation and/or irreversible damage to the EVM. If there are questions concerning the input range, please contact a TI field representative prior to connecting the input [...]

  • Page 4

    SLUU130A – September 2002 – Revised February 2003 4 TPS40003-Based 5-A Converter in Less Than One Square Inch TPS40003-Based 5-A Converter in Less Than One Square Inch Mark D ennis Systems Powe r Contents 1 Introduction 4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [...]

  • Page 5

    SLUU130A – September 2002 – Revised February 2003 5 TPS40003-Based 5-A Converter in Less Than One Square Inch 3 Schematic + Figure 1. Application Diagram for the TPS40002/3[...]

  • Page 6

    SLUU130A – September 2002 – Revised February 2003 6 TPS40003-Based 5-A Converter in Less Than One Square Inch 4 Design Procedure 4.1 TPS4000X Family Device Selection The TPS4000X family of devices offers four selections to encompass the frequency and output current mode choices. The TPS40003 is selected for the following reasons. First, the int[...]

  • Page 7

    SLUU130A – September 2002 – Revised February 2003 7 TPS40003-Based 5-A Converter in Less Than One Square Inch 4.4 Output Capacitor Selection Selection of the output capacitor is based on many application variables, including function, cost, size, and availability . The minimum allowable output capacitance is determined by the amount of inductor[...]

  • Page 8

    SLUU130A – September 2002 – Revised February 2003 8 TPS40003-Based 5-A Converter in Less Than One Square Inch 4.7 Compensation Design The TPS40003 uses voltage mode control in conjunction with a high frequency error amplifier . For the fastest transient response, the loop crossover frequency is set at 1/10 f S , or 60 kHz. The power circuit L-C[...]

  • Page 9

    SLUU130A – September 2002 – Revised February 2003 9 TPS40003-Based 5-A Converter in Less Than One Square Inch Figure 2 shows the plots for the closed loop gain and phase with V IN = 3.3 V and I OUT = 4.4 A. At the crossover frequency of 60 kHz the phase margin is approximately 51 degrees. 100 150 100 50 0 –50 –100 40 30 20 10 0 –10 –20 [...]

  • Page 10

    SLUU130A – September 2002 – Revised February 2003 10 TPS40003-Based 5-A Converter in Less Than One Square Inch 5 PowerP AD  Packaging The TPS4000X family is available in the DGQ version of TI ’ s PowerP AD  thermally enhanced package. In the PowerP AD  , a thermally conductive epoxy is utilized to attach the integrated circuit die to[...]

  • Page 11

    SLUU130A – September 2002 – Revised February 2003 11 TPS40003-Based 5-A Converter in Less Than One Square Inch 6 T est Results/Performance Data The test setup is shown in figure 4 SLUP182 TP2 TP1 TP4 TP6 TP3 TP5 J1 J2 LOAD VIN VOUT GND GND (+) ( – ) DVM2 ( – ) (+) DVM1 ( – ) (+) SCOPE C + DC Power Supply CIN = 470 µ F or larger , 6.3 V o[...]

  • Page 12

    SLUU130A – September 2002 – Revised February 2003 12 TPS40003-Based 5-A Converter in Less Than One Square Inch T ypical efficiency curves are shown in Figure 5 for an input of 3.3 V . Efficiency – % EFFICIENCY vs OUTPUT CURRENT I OUT – Output Current – A 01 2 3 45 6 50 55 60 65 70 75 80 85 90 95 100 Figure 5. Figure 6 shows the switch nod[...]

  • Page 13

    SLUU130A – September 2002 – Revised February 2003 13 TPS40003-Based 5-A Converter in Less Than One Square Inch Circuit operation with an output short circuit is shown in Figure 7. After each restart into a short circuit the pulses terminate for a period of approximately 6 ms. This causes the input power to collapse to minuscule levels, and the [...]

  • Page 14

    SLUU130A – September 2002 – Revised February 2003 14 TPS40003-Based 5-A Converter in Less Than One Square Inch Figure 9 shows the startup waveforms with an input voltage of 3.3 V and a load of 0.3 Ω . Note that the output is held low until V SS (pin 4) goes above 0.12 V , and then the output comes up smoothly under closed loop softstart contr[...]

  • Page 15

    SLUU130A – September 2002 – Revised February 2003 15 TPS40003-Based 5-A Converter in Less Than One Square Inch 7 PCB Layout Figures 1 1 through13 show the top copper layer , the bottom copper layer , and top assembly layer , of SLUP182. Figure 12 Figure 13[...]

  • Page 16

    SLUU130A – September 2002 – Revised February 2003 16 TPS40003-Based 5-A Converter in Less Than One Square Inch 8 List of Material T able 1 lists the components used in this design. With minor component tweaks this design could be modified to meet a wide range of applications. Reference Qty Description Manufacturer Part Number Capacitor C1, C2, [...]

  • Page 17

    IMPORT ANT NOTICE T exas 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 orde[...]