MAX16936TEVKIT# Analog Devices

Click here for production status of specific part numbers. Evaluates: MAX16936/MAX16938/ MAX16936 Evaluation Kit MAX16939 General Description Quick Start The MAX16936 evaluation kit (EV kit) demonstrates Required Equipment the MAX16936 high-voltage, current-mode step-down MAX16936 EV kit converter with low operating current. The EV kit operates 14V, 1A DC power supply over a wide 3.5V to 36V input range and the output is set for 5V at 2.5A. Electronic load capable of 2.5A The EV kit comes with the MAX16936RAUEA/V+ installed. Digital voltmeter (DVM) Features Procedure Wide 3.5V to 36V Input Supply Range The EV kit is fully assembled and tested. Follow the steps below to verify board operation. Caution: Do not turn on Forced-PWM or Skip-Mode Operation supplies until all connections are made. Programmable Switching Frequency 1) Verify that jumpers JU1 and JU2 are in their default Power-Good Output positions, as shown in Table 1 and Table 2. Proven PCB Layout 2) Connect the power supply between the EXT VBAT Fully Assembled and Tested and nearest PGND test points. 3) Connect the 2.5A electronic load between the OUT and nearest PGND test points. 4) Connect the DVM between the OUT and nearest PGND test points. 5) Turn on the power supply. Ordering Information appears at end of data sheet. 6) Enable the electronic load. 7) Verify that the voltage at the OUT test point is approxi- mately 5V. Table 1. EN Configuration (JU1) Table 2. Mode of Operation (JU2) SHUNT SHUNT DESCRIPTION MODE PIN MODE POSITION POSITION Connects the EN pin to the voltage at SUP Forced-PWM mode 1-2* for normal operation. 1-2* Connected to BIAS (device syncs to the internal clock) Connects the EN pin to ground to enter 2-3 shutdown mode. Connected to 2-3 SKIP mode AGND *Default position. Forced-PWM mode Connected to an Not installed (device syncs to an external clock external clock) *Default position. 19-6771 Rev 2 3/20Evaluates: MAX16936/MAX16938/ MAX16936 Evaluation Kit MAX16939 Setting the Switching Frequency (FOSC) Detailed Description of Hardware The EV kit switching frequency is set by a resistor, R The EV kit demonstrates the MAX16936 high-voltage, FOSC (R2), connected from FOSC to AGND. Refer to Figure 3. high-frequency, step-down converter with low operating in the MAX16936 IC data sheet for a graphical approach current. The EV kit operates over a wide 3.5V to 36V input of selecting the correct R (R2) value. range and the output is set for 5V at 2.5A. FOSC Power-Good Output (PGOOD) Enable (EN) The EV kit provides a PGOOD test point to monitor the Place a shunt in the 1-2 position on jumper JU1 for normal status of the device output. PGOOD asserts when VOUT operation. To place the device into shutdown mode, move rises above 95% of its regulation voltage. PGOOD the shunt on JU1 to the 2-3 position. deasserts when VOUT drops below 92% of its regulation Synchronization Input (FSYNC) voltage. The EV kit features jumper JU2 to control the synchro- Output nization input (FSYNC). The device synchronizes to an Connect FB to BIAS for a fixed +5V (EV kit default external signal applied to FSYNC. Connect FSYNC to output) or a fixed +3.3V output voltage. To set the output AGND to enable skip-mode operation. Connect to BIAS to other voltages between 1V and 10V, connect a resis- or to an external clock to enable fixed-frequency forced- tive divider from output (OUT) to FB to AGND. Use the PWM mode operation. following formula to determine the R4 and R6 of the resis- To use an external clock, uninstall the shunt on JU2 and tive divider network: apply the signal at the FSYNC test point. The external clock frequency at FSYNC can be higher or lower than the V OUT R4=R6 1 internal clock by 20%. Ensure that the duty cycle of the V FB external clock used has a minimum 100ns pulse width. where V = 1V. FB Synchronizing Output (SYNCOUT) The EV kit provides jumper JU3 to pull up the open-drain SYNCOUT to the OUT voltage. SYNCOUT is a 180 out- of-phase clock output relative to the internal oscillator at SYNCOUT to create cascaded power supplies with multiple MAX16936s. Maxim Integrated 2 www.maximintegrated.com