ISL8273MEVAL1Z

USER’S MANUAL lSL8273MEVAL1Z UG036 Rev 0.00 August 7, 2015 Evaluation Board Description Key Features The ISL8273M is a 80A 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. 80A of continuous output current can be delivered without a need of airflow or heatsink. The ISL8273M 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 2.5V • 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 ISL8273MEVAL1Z evaluation board is a 4.7inx4.8in 8-layer FR4 board with 2oz. copper on all layers. This evaluation board comes with placeholders for pin-strap resistor population to adjust output voltage, switching frequency, soft-start/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 = 1V • IMAX = 80A • fSW = 364kHz The optional ZLUSBEVAL3Z (USB to PMBus adapter) is provided with this evaluation board, 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. The ISL8273MEVAL1Z can operate in pin-strap mode without needing the ZLUSBEVAL3Z adapter or PMBus communication. • Peak efficiency: >90% at 70% load • Output ripple: 100A/μs), fSW = 300kHz. COUT = 14 x 100μF CERAMIC + 6 x 470μF POSCAP FIGURE 23. LOAD TRANSIENT RESPONSE AT VIN = 12V, VOUT = 2.5V, IOUT = 0A TO 40A (>100A/μs), fSW = 800kHz. COUT = 6 x 100μF CERAMIC + 3 x 470μF POSCAP ENABLE ENABLE VOUT (500mV/DIV) VOUT (500mV/DIV) POWER GOOD POWER GOOD 5ms/DIV 5ms/DIV FIGURE 24. SOFT-START AT VIN = 12V, VOUT = 1V, TON_DELAY = 5ms, TON_RISE = 5ms, POWER_GOOD_DELAY = 3ms FIGURE 25. SOFT-STOP AT VIN = 12V, VOUT = 1V, TOFF_DELAY = 5ms, TOFF_FALL = 5ms SW1 (10V/DIV) SW1 (10V/DIV) SW2 (10V/DIV) SW2 (10V/DIV) VOUT (500mV/DIV) VOUT (500mV/DIV) IIN5A/DIV 50µs/DIV FIGURE 26. OUTPUT SHORT-CIRCUIT PROTECTION AT VIN = 12V, VOUT = 1V, fSW = 421kHz UG036 Rev 0.00 August 7, 2015 50µs/DIV FIGURE 27. OUTPUT OVERVOLTAGE PROTECTION AT VIN = 12V, VOUT = 1V, fSW = 421kHz, VOUT_OV_FAULT_LIMIT = 1.15V Page 14 of 17 lSL8273MEVAL1Z Typical Performance Data The following data was acquired using a ISL8273MEVAL1Z evaluation board. (Continued) SW1 (10V/DIV) SW1 (10V/DIV) SW2 (10V/DIV) SW2 (10V/DIV) VOUT (1V/DIV) VOUT (1V/DIV) IIN (5A/DIV) IIN (5A/DIV) 50ms/DIV 50ms/DIV FIGURE 28. OUTPUT SHORT-CIRCUIT PROTECTION WITH CONTINUOUS RETRY ENABLED (HICCUP MODE), VIN = 12V, VOUT = 1V MODULE #1:VOUT = 1V MODULE #2:VOUT = 1.5V MODULE #3:VOUT = 2.5V VOUT_3 (1V/DIV) FIGURE 29. OUTPUT SHORT-CIRCUIT RECOVERY FROM CONTINUOUS RETRY (HICCUP MODE). VIN = 12V, VOUT = 1V MODULE #1:VOUT = 1V MODULE #2:VOUT = 1.5V MODULE #3:VOUT = 2.5V VOUT_3 (1V/DIV) VOUT_2 (1V/DIV) VOUT_2 (1V/DIV) VOUT_1 (1V/DIV) VOUT_1 (1V/DIV) ENABLE ENABLE 5ms/DIV FIGURE 30. SOFT-START WITH OUTPUT SEQUENCING AT VIN = 12V, THREE ISL8273MEVAL1Z BOARDS ARE CONNECTED IN DAISY CHAIN 5ms/DIV FIGURE 31. SOFT-STOP WITH OUTPUT SEQUENCING AT VIN = 12V, THREE ISL8273MEVAL1Z BOARDS ARE CONNECTED IN DAISY CHAIN 10V/DIV SW1 OF MODULE #1 SW2 OF MODULE #1 10V/DIV VOUT (200mV/DIV) SW1 OF MODULE #2 10V/DIV SW2 OF MODULE #2 10V/DIV 5ms/DIV FIGURE 32. DYNAMIC VOLTAGE SCALING WITH VOUT CHANGE FROM 1V TO 1.1V, VIN = 12V, VOUT_TRANSITION_RATE = 1mV/µs UG036 Rev 0.00 August 7, 2015 1µs/DIV FIGURE 33. PHASE SPREADING/INTERLEAVING, TWO ISL8273MEVAL1Z BOARDS ARE CONNECTED IN DAISY CHAIN, MODULE #1 RAIL POSITION: 0; MODULE #2 RAIL POSITION:4. VIN = 12V, VOUT_1 = 1.8V, VOUT_2 = 1.2V, fSW = 421kHz Page 15 of 17 lSL8273MEVAL1Z Typical Performance Data The following data was acquired using a ISL8273MEVAL1Z evaluation board. (Continued) FIGURE 34. THERMAL IMAGE AT VIN = 12V, VOUT = 1V, IOUT = 80A, fSW = 300kHz, TA = +25°C, NO AIRFLOW UG036 Rev 0.00 August 7, 2015 FIGURE 35. THERMAL IMAGE AT VIN = 12V, VOUT = 1.8V, IOUT = 80A, fSW = 350kHz, TA = +25°C, NO AIRFLOW Page 16 of 17 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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