EVB-ER3125QI

Enpirion Power Evaluation Board ER3125QI 2.5A Regulator with Integrate High-Side MOSFET for Synchronous Buck Evaluation Board User Guide Description This is the ER3125QI Evaluation Board User circuitry against system faults. This level of Guide. The ER3125QI features a wide input integration delivers a substantial reduction in range of 3V to 36V for a synchronous buck footprint and part count over competing with a high-side MOSFET and low-side driver solutions. The evaluation board is optimized for integrated, flexible selection of operation engineering ease of testing through modes of forced PWM mode and LLM mode, programming options, clip leads, test points Programmable frequency, and protection and supporting external components. Evaluation Board Over View 3 4 6 5 13 8 9 10 11 12 (a) ER3125QI EVB Top Side www.altera.com/enpirion 10807 March 25, 2015 Rev AER3125QI Evaluation Board User Guide 4 3 5 6 13 14 7 2 9 12 11 10 (b) ER3125QI EVB Bottom Side Figure 1. ER3125QI Evaluation Board Illustration (Follow instructions on page 2) Instructions The numbers in the instructions below correspond Do not turn the power supply on until to the numbers in Figure 1. By following the number everything is connected correctly. sequence below, the device can be turned on by step 6. 4) VIN- (Input Ground) Connect the input power supply ground to VIN-. 1) ENABLE Left floating or connect an external clock for ON/OFF operation (0V to 5) VOUT+ (VOUT) Connect the load to 5.5V). The device is disabled when this pin VOT+. is pulled LOW. 6) VOUT- (Output Ground) Connect the 2) Output Voltage Setting The output load ground to VOUT-. If the instructions voltage programming resistor R4, depends were followed up to this point, the power on the value chosen for the feedback supply may be turned on. resistor R3 and the desired output voltage VOUT. Equation 1 describes the 7) FSW (R1) The ER3125QI Evaluation relationship between VOUT and the resistor Board operates at the default switching values. frequency mode (500kHz). The frequency = 0.6/( 0.6) (1) can be programmed to any frequency 4 3 The feedback resistor R3 is chosen as between 200kHz and 2.2MHz with a resistor 232k. When changing the output voltage it R (R1) from FSW pin to GND. FSW may also be necessary to change certain other circuit elements for stability. See = (145000 16 ())/ () 1 datasheet page 23 for more details. (2) 3) VIN+ (PVIN) Connect the positive terminal 8) Soft Start Capacitor (Css) The soft start of a 3.0V to 36.0V power supply to VIN+. capacitor is by defaulted 15nF. See www.altera.com/enpirion, Page 2 10807 March 25, 2015 Rev A