ISL8272MEVAL1Z

USER’S MANUAL lSL8272MEVAL1Z UG003 Rev 0.00 September 17, 2014 Evaluation Board User Guide Description Key Features The ISL8272M is a 50A step-down DC/DC power supply module with an integrated digital PWM controller, dual-phase synchronous power switches, inductors and passives. Only input output capacitors and minimal passives are needed to finish the design. 50A of continuous output current can be delivered without a need of airflow or heatsink. The ISL8272M uses ChargeMode™ control (ASCR) architecture, which responds to a transient load within a single switching cycle. • VIN range of 4.5V to 14V, VOUT adjustable from 0.6V to 5V • Programmable VOUT, margining, input and output UVP/OVP, IOUT limit, OTP/UTP, soft-start/stop, sequencing, and external synchronization • Monitor: VIN, VOUT, IOUT, temperature, duty cycle, switching frequency and faults • ChargeMode™ control tunable with PMBus • Mechanical switch for enable and power-good LED indicator The ISL8272MEVAL1Z evaluation board is a 4.7in x 4.8in 6-layer FR4 board with 2oz. copper in all layers. This evaluation board comes with placeholders for pin-strap resistor population to adjust output voltage, switching frequency, softstart/stop timing and input UVLO threshold, ASCR gain and residual parameters and device PMBus™ address. More configurations, such as sequencing, Digital-DC™ (DDC) bus configuration and fault limits can be easily programmed or changed via PMBus compliant serial bus interface. Specifications This board has been configured for the following operating conditions by default: • VIN = 5V to 12V • VOUT = 1.2V • IMAX = 50A ZLUSBEVAL3Z (USB to PMBus adapter) is provided with this evaluation kit, which connects the evaluation board to a PC to activate the PMBus communication interface. The PMBus command set is accessed by using the PowerNavigator™ evaluation software from a PC running Microsoft Windows. • fSW = 421kHz • Peak efficiency: >90.5% at 70% load • Output ripple: 100A/μs), fSW = 533kHz. COUT = 8 x 100μF CERAMIC + 4 x 470μF POSCAP FIGURE 18. LOAD TRANSIENT RESPONSE AT VIN = 12V, VOUT = 3.3V, IOUT = 0A TO 25A (>100A/μs), fSW = 533kHz. COUT = 4 x 100μF CERAMIC + 2 x 470μF POSCAP ENABLE ENABLE VOUT (1V/DIV) VOUT (1V/DIV) POWER-GOOD POWER-GOOD 5ms/DIV 5ms/DIV FIGURE 20. SOFT-STOP AT VIN = 12V, VOUT = 1.2V, TOFF_DELAY = 5ms, TOFF_FALL = 5ms FIGURE 19. SOFT-START AT VIN = 12V, VOUT = 1.2V, TON_DELAY = 5ms, TON_RISE = 5ms, POWER_GOOD_DELAY = 4ms PHASE1 (10V/DIV) PHASE1 (10V/DIV) PHASE2 (10V/DIV) PHASE2 (10V/DIV) VOUT (1V/DIV) VOUT (500mV/DIV) IIN (5A/DIV) 10µs/DIV FIGURE 21. OUTPUT SHORT CIRCUIT PROTECTION AT VIN = 12V, VOUT = 1.2V, fSW = 533kHz UG003 Rev 0.00 September 17, 2014 20µs/DIV FIGURE 22. OUTPUT OVERVOLTAGE PROTECTION AT VIN = 12V, VOUT = 1.2V, fSW = 533kHz, VOUT_OV_FAULT_LIMIT = 1.38V Page 12 of 15 lSL8272MEVAL1Z Typical Performance Data The following data was acquired using a ISL8272MEVAL1Z evaluation board. (Continued) PHASE1 (10V/DIV) PHASE1 (10V/DIV) PHASE2 (10V/DIV) PHASE2 (10V/DIV) VOUT (1V/DIV) IIN (5A/DIV) VOUT (1V/DIV) IIN (5A/DIV) 50ms/DIV 50ms/DIV FIGURE 23. OUTPUT SHORT CIRCUIT PROTECTION WITH CONTINUOUS RETRY ENABLED (HICCUP MODE), VIN = 12V, VOUT = 1.2V MODULE #1: VOUT = 1V MODULE #2: VOUT = 1.5V MODULE #3: VOUT = 2.5V FIGURE 24. OUTPUT SHORT CIRCUIT RECOVERY FROM CONTINUOUS RETRY (HICCUP MODE). VIN = 12V, VOUT = 1.2V VOUT_3 (1V/DIV) VOUT_3 (1V/DIV) VOUT_2 (1V/DIV) VOUT_2 (1V/DIV) VOUT_1 (1V/DIV) VOUT_1 (1V/DIV) ENABLE MODULE #1: VOUT = 1V MODULE #2: VOUT = 1.5V MODULE #3: VOUT = 2.5V ENABLE 5ms/DIV FIGURE 25. SOFT-START WITH OUTPUT SEQUENCING AT VIN = 12V, THREE ISL8272MEVAL1Z BOARDS ARE CONNECTED IN DAISY CHAIN 5ms/DIV FIGURE 26. SOFT-STOP WITH OUTPUT SEQUENCING AT VIN = 12V, THREE ISL8272MEVAL1Z BOARDS ARE CONNECTED IN DAISY CHAIN 10V/DIV PHASE1 OF MODULE #1 10V/DIV VOUT (200mV/DIV) PHASE2 OF MODULE #1 10V/DIV PHASE1 OF MODULE #2 10V/DIV PHASE2 OF MODULE #2 5ms/DIV FIGURE 27. DYNAMIC VOLTAGE SCALING WITH VOUT CHANGE FROM 1.1V TO 1.3V, VIN = 12V, VOUT_TRANSITION_RATE = 1mV/µs UG003 Rev 0.00 September 17, 2014 1µs/DIV FIGURE 28. PHASE SPREADING/INTERLEAVING, TWO ISL8272MEVAL1Z BOARDS ARE CONNECTED IN DAISY CHAIN, MODULE #1 RAIL POSITION: 0; MODULE #2 RAIL POSITION:4. VIN = 12V, VOUT_1 = 1.2V, VOUT_2 = 3.3V, fSW = 421kHz Page 13 of 15 lSL8272MEVAL1Z Typical Performance Data The following data was acquired using a ISL8272MEVAL1Z evaluation board. (Continued) FIGURE 29. THERMAL IMAGE AT VIN = 12V, VOUT = 1V, IOUT = 50A, fSW = 300kHz, TA = +25°C, NO AIRFLOW UG003 Rev 0.00 September 17, 2014 FIGURE 30. THERMAL IMAGE AT VIN = 14V, VOUT = 5V, IOUT = 50A, fSW = 533kHz, TA = +25°C, NO AIRFLOW Page 14 of 15 Notice 1. Descriptions of circuits, software and other related information in this document are provided only to illustrate the operation of semiconductor products and application examples. You are fully responsible for the incorporation or any other use of the circuits, software, and information in the design of your product or system. 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