DEMO MANUAL DC2230A-B LTM4636-1 40A DC/DC Module Regulator with Overvoltage/Overtemperature Protection Description tions. The MODE PLLIN pin also allows the LTM4636 Demonstration circuit 2230A-B features the LTM 4636- to synchronize to an external clock signal. DC2230A-B 1EY, a 40A high efficiency, switch mode step-down power has the option of choosing both internal and external Module regulator with overtemperature and input/output compensation circuit for LTM4636-1. Tying the PHASMD overvoltage protection. The input voltage range is from pin to different voltage generates certain phase difference 4.7V to 15V. For input voltage range from 4.7V to 5.5V, between MODE PLLIN and CLKOUT. The LTM4636-1 data short PV pin to V pin with R8 = R21 = 0 and remove CC IN sheet must be read in conjunction with this demo manual R17. The output voltage range is 0.6V to 3.3V. Derating prior to working on or modifying demo circuit DC2230A-B. is necessary for certain V , V , frequency and thermal IN OUT conditions. The board operates in continuous conduc- Design files for this circuit board are available at tion mode in heavy load conditions. For high efficiency DEMO MANUAL DC2230A-B erformance ps PARAMETER CONDITIONS/NOTES VALUE Input Voltage Range 4.7V to 15V Output Voltages 1.0V 1.3% Maximum Continuous Output Current Derating is Necessary for Certain Operating Conditions. See Data Sheet for Details. 40ADC Operating Frequency 350kHz Efficiency V = 12V, V = 1.0V, I = 40A, Q2 Not Included 87.7% (see Figure 2) IN OUT OUT Load Transient V = 12V, V = 1.0V, I = 0A to 10A 81mV (see Figure 3) IN OUT STEP Overtemperature Trip Point R = R = 66.5k 130C OTP 56 Overvoltage Trip Point R = R = 86.6k 1.18V OVP 10 Quick tart sDp 4. Vary the input voltage from 6V to 15V and adjust the Demonstration circuit 2230A-B is an easy way to evalu- load current from 0A 40A. Observe the output volt- ate the performance of the LTM4636-1EY. Please refer to age regulation, ripple voltage, efficiency, and other Figure1 for proper measurement equipment setup and parameters. follow the procedure below. 5. (Optional) For optional load transient test, apply an 1. Place jumpers in the following positions for a typical adjustable pulse signal between IOSTEP CLK and GND application: test points. The pulse amplitude sets the load step cur- MODE RUN rent amplitude. Keep the pulse width short (<1ms) and CCM ON pulse duty cycle low (<5%) to limit the thermal stress on the load transient circuit. 2. With power off, connect the input power supply, load 6. (Optional) LTM4636 can be synchronized to an external and meters as shown in Figure 1. Preset the load to 0A clock signal. Place the JP1 jumper on EXT CLK and and V supply to 12V. IN apply a clock signal (0V to 5V, square wave) on the 3. Turn on the power supply at the input. The output volt- MODE PLLIN test point. age should be 1.0V 1.3% (0.987V to 1.013V). dc2230abf 2 ure roce ummary