Using the TPS211xADRB EVM User's Guide Literature Number: SLUU409 February 2010
User's Guide SLUU409 – February 2010 TPS211xADRB EVM, Power Multiplexer Evaluation Module 1 Introduction The TPS211xA EVM is an evaluation module for the Texas Instruments TPS211xA family of two-input, one-output power multiplexers. These multiplexers enable seamless transition between two power supplies, each operating at 2.8 V-5.5 V and delivering up to 1 A. TPS211xA EVM-061 is used for TPS211xAPW packaged parts.
EVM Setup www.ti.com 2.2 Current-Limit Adjustment Potentiometer R4 controls the resistance RILIM that sets the TPS211xA current limit threshold. Adjusting R4 clockwise increases the current limit threshold by decreasing RILIM. The current limit threshold is 500/RILIM for the TPS2113A and TPS2115A. To measure the resistance RILIM, connect an ohmmeter between test points TP4 and GND. The measurement should be made with the IN1 and IN2 supplies off.
EVM Setup 2.4.2 www.ti.com Mode 2 Automatic Switching (TPS2113A Only) In Mode 2 automatic switching, OUT connects to IN1 if the voltage at IN1 is sufficiently high; otherwise, OUT connects to the higher of IN1 and IN2. The threshold at which IN1 is selected corresponds to approximately 0.8 V at test point TP3. The corresponding value of the IN1 voltage depends upon the setting of potentiometer R2. Adjusting R2 clockwise increases the IN1 selection threshold voltage. Table 2.
Schematic and List of Materials www.ti.com 3 Schematic and List of Materials This chapter provides the TPS211xAEVM schematic and list of materials. 3.1 EVM Configurations Table 3. Available EVM Configurations 3.2 EVM DESIGNATOR DEVICE CURRENT-LIMIT ADJUSTMANT RANGE SWITCH STATUS OUTPUT SWITCHING MODE AUTOMATIC HPA581-001 TPS2113A 0.63 A to 1.25 A Yes Yes No HPA581-002 TPS2115A 0.63 A to 1.25 A Yes Yes Yes MANUAL Schematic Figure 2. TPS211xAEVM Schematic Table 4.
Schematic and List of Materials 3.3 www.ti.com List of Materials Table 5. TPS2113A/5A List of Materials (1) (2) (3) (4) -002 (1) (2) (3) (4) 6 -001 RefDes Description PART NUMBER MFR 1206R104K9B20 D Philips 2 2 C1, C2 Capacitor, ceramic, 0.
Board Layout www.ti.com 4 Board Layout This chapter describes the TPS211xAEVM board layout and presents some component placement considerations. 4.1 Layout Considerations The IN1, IN2, and OUT pins of the TPS211xA can carry up to 1 A, so traces to these pins should be of suitable length and width to minimize the voltage drop to the load. Locate the 0.1 mF bypass capacitors close to the IN1, IN2, and GND pins of the TPS211xA. Figure 3. Top-Side Layout Figure 4.
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