Texas Instruments TPS40003 - Manuals

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

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 modechoices. The TPS40003 is selec...

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, andavailability. The minimum allowable output capacit...

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 fastesttransient response, the loop crossover frequency is set at...

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 10...

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

SLUU130A – September 2002 – Revised February 2003 11 TPS40003-Based 5-A Converter in Less Than One Square Inch 6 Test 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 C...

SLUU130A – September 2002 – Revised February 2003 12 TPS40003-Based 5-A Converter in Less Than One Square Inch Typical efficiency curves are shown in Figure 5 for an input of 3.3 V. Efficiency – % EFFICIENCY vs OUTPUT CURRENT IOUT – Output Current – A 0 1 2 3 4 5 6 50 55 60 65 70 75 80 85 90 95 100 ...

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 pulsesterminate for a period of approximately 6 ms. This causes the input po...

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...

SLUU130A – September 2002 – Revised February 2003 15 TPS40003-Based 5-A Converter in Less Than One Square Inch 7 PCB Layout Figures 11 through13 show the top copper layer, the bottom copper layer, and top assembly layer, of SLUP182. Figure 12 Figure 13

SLUU130A – September 2002 – Revised February 2003 16 TPS40003-Based 5-A Converter in Less Than One Square Inch 8 List of Material Table 1 lists the components used in this design. With minor component tweaks this design could be modifiedto meet a wide range of applications. Reference Qty Description...

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