MAX13253 Evaluation Kit Evaluates: MAX13253 General Description Features and Benefits The MAX13253 evaluation kit (EV kit) is a fully assembled 3.0V to 5.5V Operating Voltage Range and tested PCB that demonstrates the MAX13253 low- Up to 90% Efficiency EMI push-pull transformer driver. The EV kit operates Push-Pull Rectified Output from a single 3.0V to 5.5V supply and the on-board 1CT:1.3CT turns-ratio transformer sets the output voltage. Configurable Bipolar Outputs or Full-Wave Rectifier The EV kit provides up to 90% overall efficiency at Internal or External Clock Operation 5V with up to 4.5W output power using a push-pull Selectable Spread-Spectrum Option for Controlled EMI isolated DC-DC converter. Undervoltage lockout, current limiting, and thermal shutdown provide for a robust Proven PCB Layout isolated supply. The surface-mount transformer provides Fully Assembled and Tested galvanic isolation with the output powered from a push-pull rectifier circuit, reducing the output-voltage ripple. The EV kit circuit is configured as a push-pull rectifier, with an output voltage that follows the input voltage. The EV kit is also configurable for other topologies including bipolar Ordering Information appears at end of data sheet. outputs and full-wave rectification. Component List DESIGNATION QTY DESCRIPTION DESIGNATION QTY DESCRIPTION 1F 10%, 25V X7R ceramic J2, J5 2 2-pin headers C1, C2 2 capacitors (0603) Murata GRM188R71E105K R1 1 560 5% resistor (0603) R2 1 0 5% resistor (0603) 10F 10%, 25V X7R ceramic C3, C5 2 capacitors (1206) R3 1 1k 5% resistor (0603) Murata GRM31CR71E106K 1CT:1.3CT turns-ratio transformer Not installed, ceramic capacitor TX1 1 (8 Gull Wing) C4 0 (1206) Halo TGM-H240V8LF D1 1 Red LED (1206) 1A spread-spectrum push-pull 30V, 2A Schottky diodes (SMA) U1 1 transformer driver (10 TDFN-EP*) D2, D3 2 Diodes Inc. B230A-13-F Maxim MAX13253ATB+ Not installed, Schottky diodes 5 Shunts D4, D5 0 (SMA) PCB: MAX13253 EVALUATION 1 J1, J3, J4 3 3-pin headers KIT *EP = Exposed pad. Component Suppliers SUPPLIER PHONE WEBSITE Diodes Incorporated 972-987-3900 www.diodes.com Halo Electronics, Inc. 650-903-3800 www.haloelectronics.com Murata Electronics, North America, Inc. 770-436-1300 www.murata-northamerica.com Note: Indicate that you are using the MAX13253 when contacting these component suppliers. 19-6624 Rev 0 3/13MAX13253 Evaluation Kit Evaluates: MAX13253 10) Verify that the voltmeter reads approximately 5.5V. Quick Start Required Equipment Detailed Description MAX13253 EV kit The MAX13253 EV kit is a low-EMI, isolated push-pull DC-DC converter that provides an unregulated output 5.0V, 2A DC power supply with respect to the isolated ground. The maximum load is Electronic load capable of 1A limited by the device and winding ratio of the transformer. Ammeter The device is an integrated primary-side controller and Voltmeter push-pull driver for isolated power-supply circuits. The device contains an on-board oscillator, protection circuitry, Procedure and internal MOSFETs to provide up to 1A of current The EV kit is fully assembled and tested. Follow the steps to the transformers primary winding. The device can below to verify board operation. Caution: Do not turn on be operated using the internal pin-selectable oscillator, the power supply until all connections are completed. or driven by an external clock to synchronize multiple devices. 1) Verify that jumpers J1J5 are in their default The device operates from a single-supply voltage and positions, as shown in Table 1. includes UVLO and an active-low enable input for 2) Set the DC power supply to 5.0V. controlled startup. If the input voltage at V falls below DD 3) Set the electronic load to 500mA and disable the 2.55V, or the EN input is pulled above 2.0V, the device output. shuts down and T1 and T2 are high impedance. 4) Connect the voltmeter between the +VOUT and Clock Source SGND PCB pads on the EV kit. The device has two modes of operation, internal oscillator 5) Connect the ammeter between the +VOUT PCB pad or external clock. on the EV kit and the positive terminal on the electronic Using the Internal Oscillator and Spread-Spectrum load. The negative terminal on the electronic load is Functionality connected to the SGND PCB pad on the EV kit. The device includes an internal oscillator with a guaranteed 6) Connect the power supply between the VDD and 50% duty cycle. To use the internal oscillator, place a shunt GND PCB pads on the EV kit. across pins 1-2 on jumper J2. Place a shunt across pins 7) Turn on the power supply. 1-2 on jumper J3 to set the T1/T2 switching frequency to 8) Enable the electronic load. 600kHz (typ). Place a shunt across pins 2-3 on J3 to set the T1/T2 switching frequency to 250kHz (typ). 9) Verify that the ammeter reads approximately 500mA. Table 1. Jumper Description Table JUMPER SHUNT POSITION DESCRIPTION 1-2 EN connected to V . DD J1 2-3* EN connected to GND. Device enabled. Installed* CLK connected to GND. Internal oscillator enabled. J2 Not installed CLK open. External oscillator enabled. Apply a clock signal to the CLK PCB pad on the EV kit. 1-2 HICLK connected to V . T1/T2 switch at 600kHz. DD J3 2-3* HICLK connected to GND. T1/T2 switch at 250kHz. 1-2 SPRD connected to V . Spread-spectrum functionality enabled. DD J4 2-3* SPRD connected to GND. Spread-spectrum functionality disabled. Not installed* +VOUT is not shorted to SGND. J5 Installed +VOUT is shorted to SGND. *Default position. 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