DEMO CIRCUIT 1601A LTM4607EV QUICK START GUIDE LTM(R)4607EV High Efficiency Poly-Phase Buck-Boost Power Supply DESCRIPTION Demonstration circuit DC1601A is a poly-phase power supply featuring the LTM4607 Power module, a complete high efficiency switching mode buck-boost power supply. The DC1601A input voltage range is from 6V to 36V and is capable of delivering high power through paralleled LTM4607 modules. The demo circuit can deliver up to 10A of output current for 2 paralleled modules (DC1601A-A), 15A for 3 paralleled modules (DC1601A-B) and up to 20A for 4 paralleled modules (DC1601A-C). The DC1601A demonstrates that paralleling modules is easy and reliable. The output voltage for the board is 12V. The rated load current per module is 5A, however current de-rating may be necessary under certain VIN, VOUT, frequency, and thermal conditions. An on-board external clock is provided for synchronization and interleaving of phases to minimize input and output ripple. An internal phaseTable 1. Performance Summary PARAMETER Maximum Input Voltage Minimum Input Voltage Output Voltage VOUT Maximum Continuous Output Current IOUT MAX Default Operating Frequency External Clock Sync. frequency range Output voltage ripple (typical) locked loop allows the LTM4607 to be synchronized to an external clock within the range of 200 kHz to 400 kHz. The LTM4607 default switching frequency on the DC1601A is set to 300 kHz through the on-board LTC6902 clock generator which interleaves the paralleled phases. The frequency and phase separation set by the LTC6902 are resistor programmable. These features, including the availability of the LTM4607 in a compact thermally enhanced 15mmx15mmx2.8mm LGA package make the demonstration circuit ideal for use in high-density point of load regulation applications. Design files for this circuit board are available. Call the LTC Factory. , LTC, LT and LTM are registered trademarks of Linear Technology Corporation. CONDITIONS / NOTES Programmed by R22 Current de-rating may be necessary for certain VIN, VOUT, frequency and thermal conditions. VOUT = 12V 300kHz (20MHz BW) Efficiency VIN = 9V, VOUT = 12V Load Transient VOUT = 12V 300kHz (20MHz BW) 300kHz VALUE 36V 6V 12V 10ADC (DC1601A-A) 15ADC (DC1601A-B) 20ADC (DC1601A-C) 300kHz 200kHz - 400kHz VIN = 9V, IOUT = 10A (DC1601A-A), See Fig. 5a VIN = 12V, IOUT = 15A (DC1601A-B), See Fig. 5b VIN=32V, IOUT=20A (DC1601A-B), See Fig. 5c 95.7% @ IOUT = 10A (DC1601A-A), See Fig. 2a 94.8% @ IOUT = 15A (DC1601A-B), See Fig. 2b 94.8% @ IOUT = 20A (DC1601A-C), See Fig. 2c VIN = 9V, IOUT = 10A (DC1601A-A), See Fig. 4a VIN = 12V, IOUT = 15A (DC1601A-B), See Fig. 4b VIN=32V, IOUT=20A (DC1601A-B), See Fig. 4c 1 LTM4607EV QUICK START PROCEDURE Demonstration circuit DC1601A is easy to set up to evaluate the performance of paralleled LTM4607 modules. Please refer to Figure 1 for proper measurement equipment setup and follow the procedure below: 1. With power off, connect the input power supply, load, and meters as shown in Figure 1. Preset the load to 0A and VIN supply to be 0V. Place jumpers in the following positions for a typical 12VOUT application: JP2 MODE CCM JP1 RUN OFF JP3 START SSO 2. Turn on the power at the input. Increase VIN to 18V (Do not hot-plug the input supply or apply more than the rated maximum voltage of 36V to the board or the modules may be damaged). 3. Set the run pin jumper (JP1) to the ON position. The output voltage should be regulated. The output voltage meter should read 12V2% (11.76V-12.24V). 4. Vary the input voltage from 6V-36V and adjust the load current from 0-10A (for DC1601A-A), 0-15A (for DC1601A-B), 0-20A (for DC1601AC). VOUT should remain regulated at 12V2% (11.76V-12.24V). Observe the load regulation, efficiency and other parameters. 5. Set the load current to 0A. Set the RUN pin jumper (JP1) to the OFF position. Turn off input supply before disconnecting the circuit. Figure 1. 2 LTM4607EV Figure 2a: Measured Efficiency at 12VOUT, 300 kHz (DC1601A-A) Figure 3a: Thermal capture at 6VIN, 12VOUT,, 10A, 300kHz (DC1601A-A) No Forced Airflow (Convection) Figure 2b: Measured Efficiency at 12VOUT, 300 kHz (DC1601A-B) Figure 3b: Thermal capture at 12VIN, 12VOUT,, 15A, 300kHz (DC1601A-B) No Forced Airflow (Convection) Figure 2c: Measured Efficiency at 12VOUT, 300 kHz (DC1601A-C) Figure 3c: Thermal capture at 32VIN, 12VOUT,, 20A, 300kHz (DC1601A-C) No Forced Airflow (Convection) 3 LTM4607EV DC1601A-A: VIN = 9V, VOUT = 12V, IOUT DC = 5A, IOUT Step = 5A, fSW = 300 kHz VOUT (50mV/div) DC1601A-A: VIN = 9V, VOUT = 12V, IOUT = 10A, fSW = 300 kHz VOUT (20mV/div) IOUT Step (5A/div) Figure 4a. Measured Load Step Response (DC1601A-A) DC1601A-B: VIN = 12V, VOUT = 12V, IOUT DC = 7.5A, IOUT Step = 7.5A, fSW = 300 kHz VOUT (20mV/div) Figure 5a: Measured Output Voltage Ripple (DC1601A-A) DC1601A-A: VIN = 12V, VOUT = 12V, IOUT = 15A, fSW = 300 kHz VOUT (20mV/div) IOUT Step (5A/div) Figure 4b. Measured Load Step Response (DC1601A-B) DC1601A-C: VIN = 32V, VOUT = 12V, IOUT DC = 10A, IOUT Step = 7.5A, fSW = 300 kHz VOUT (200mV/div) Figure 5b: Measured Output Voltage Ripple (DC1601A-B) DC1601A-C: VIN = 32V, VOUT = 12V, IOUT = 20A, fSW = 300 kHz VOUT (20mV/div) IOUT Step (20A/div) Figure 4c. Measured Load Step Response (DC1601A-C) 4 Figure 5c: Measured Output Voltage Ripple (DC1601A-C) LTM4607EV 5 LTM4607EV 6 LTM4607EV 7