Application Note 1544 ISL8200MEVAL2PHZ Evaluation Board User’s Guide VOUT = 1V LOAD UP TO 20A PGOOD VIN = UP TO 20V VOUT SENSING POINT MODULE GROUP 2 (U301) IOUT STEP SENSING POINT TRANSIENT LOAD CIRCUIT MODULE GROUP 1 (U201) 12V SUPPLY FOR TRANSIENT LOAD FIGURE 1. ISL8200MEVAL2PHZ EVALUATION BOARD ISL8200MEVAL2PHZ Evaluation Board The ISL8200M is a complete 10A step-down current share-able switch mode power module in a low profile package. It can be used in a standalone single-phase operation as well as current shared applications where multiple modules are connected in parallel. The ISL8200MEVAL2PHZ evaluation board is used to demonstrate performance of the ISL8200M 2-phase current shared application. The input voltage range can be up to 20V, and the output voltage is 1V and 20A maximum load. The output voltage can support a range up to 6V with the proper output capacitor rating. Recommended Equipment • 0V to 20V power supply with at least 15A source current capability. • One Electronic Load capable of sinking current up to 20A. • Digital multi-meters (DMMs). • 100MHz quad-trace oscilloscope. • Signal generator (for synchronization demonstration) February 23, 2010 AN1544.0 1 Circuits Description PVIN1 and GND banana plugs are the input power terminals. Two input electrolytic caps footprint are provided to handle the input current ripple. Two SANYO POSCAP 2TPF330M6 (330µF, ESR 6mΩ) are used as output E-caps for each channel. Also, cap footprints are available for the user to evaluate different output caps. J3, J4 are output lugs for load connections. TP8, TP10 are output voltage sensing points. These pins can be used to monitor and evaluate the system voltage regulations. If the user wants to use these test posts for remote sensing, RM+2, RM-2, RM+3, and RM-3 need to be changed to higher values, such as 10Ω. The Transient Load Circuit box shown in Figure 1, contains the circuit option for the on-board transient load control to the power module. Apply 12V supply on TP32 to use the transient load, and switch SW1 toward CR1 LED to enable it. CR1 will be red when the transient load is disabled, and becomes green when it is enabled. The resistors R65 and R67 set the amount of step load with a default value of 10A for 1V output (1V/0.1Ω). The voltage corresponding to the amount of step load is monitored at TP16. CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc. Copyright Intersil Americas Inc. 2010. All Rights Reserved All other trademarks mentioned are the property of their respective owners. Application Note 1544 JP201 is a SIP connector that can be used with R223 = 0Ω installed to inject a clock signal to synchronize the module to. The default phase shift of the CLKOUT signal from module 1 (U201) causes the second to switch with a phase shift of 180°, which can be observed by the relative phase between PHASE2 and PHASE3 signals as shown in Figure 14. R203, R303 and C210, C310 are small added filters for the VIN pins. [R233, R234, C208, and Q203] and [R333, R334, C308, and Q303] are used to allow smoother VOUT at start-up. Quick Start 1. Ensure that the circuit is correctly connected to the supply (PVIN1 and GND banana plugs) and load (J3 and J4) prior to applying any power. 2. Adjust the input supply to be 5V. Turn on the input power supply. 3. Verify the two outputs’ voltages are correct. If the PGOOD is set high, LED301 will be green. If the PGOOD is set low, LED301 will be red. TP301 is the test post to monitor PGOOD. Evaluating Other Output Voltages The ISL8200MEVAL2PHZ kit outputs are preset to 1.0V/20A. VOUT can also be adjusted between 0.6V to 6V by changing the value of R221 and R321 simultaneously as given by Equation 1. ( V OUT – V REF ) where VREF = 0.6V R221 = ------------------------------------------ ROS ( V REF ) (EQ. 1) ROS = 2.2k internal The output capacitors must be changed to support the corresponding output voltage. The onboard output capacitors are rated at 2V max. Programming the Input Voltage UVLO and its Hysteresis By programming the voltage divider at the EN pin connected to the input rail, the input UVLO and its hysteresis can be programmed. The ISL8200MEVAL2PHZ has R1 = 8.25k and R2 = 2.05k; the IC will be disabled when the input voltage drops below 4.5V and will restart after VIN recovers to be above 4.0V. The UVLO equations are re-stated in the following, where RUP and RDOWN are the upper and lower resistors of the voltage divider at EN pin, VHYS is the desired UVLO hysteresis and VFTH is the desired UVLO falling threshold. V HYS R UP = --------------I HYS where IHYS = N x 30µA N = number of phases (=2) R UP ⋅ V ENREF R DOWN = -------------------------------------------- where RENREF = 0.8V V FTH – V ENREF 2 For 12V applications, if it is desired to have the IC disabled when the input voltage drops below 9V and restart when VIN recovers above 10.6V, then R1 = 16.5k and R2 = 2.6k. Efficiency Measurement Figure 10 shows the efficiency measurement for the ISL8200MEVAL2PHZ Eval Board. The voltage and current meter can be used to measure input/output voltage and current. In order to obtain an accurate measurement and prevent the voltage drop of PCB or wire trace, the voltage meter must be close to the input/output terminals. For simplicity, the measuring point for the input voltage meter is at the TP1 terminal, and the measuring point for the output voltage meter is at the TP20 terminal. The efficiency equation is shown in Equation 4: ( V OUT • I OUT ) P OUT Output Power Efficiency = ------------------------------------ = ---------------- = ---------------------------------------P IN ( V IN • I IN ) Input Power (EQ. 4) Output Ripple/Noise Measurement Simple steps should be taken to ensure that there is minimum pickup noise due to high frequency events, which can be magnified by the large ground loop formed by the oscilloscope-probe ground. This means that even a few inches of ground wire on the oscilloscope probe may result in hundreds of millivolts of noise spikes when improperly routed or terminated. This effect can be overcome by using the short loop measurement method to minimize the measurement loop area for reducing the pickup noise. The short loop measurement method is shown in Figure 2. For ISL8200MEVAL2PHZ evaluation board, the output ripple/noise measurement point is located at the C38 terminal. OUTPUT CAP OUTPUT OUTPUT CAP CAP OR MOSFET FIGURE 2. OUTPUT RIPPLE/NOISE MEASUREMENT (EQ. 2) (EQ. 3) AN1544.0 February 23, 2010 CLK_12 SYS_ISH_BUS JP201 R215 10k 2 1 R217 10k R211 PHASE2 16 VSEN_REM-2 1 VOUT_SET PGND1.23 OCSET 21 VCC2 ISFETDRV2 R209 DNP 17 C205 DNP C201 DNP 2N7002DW Q203 PHASE2 PGOOD VOUT C203 C208 0.1uF 22u C206 22u C207 DNP C202 22uF R234 10k 60k R233 20 OCSET2 PHASE GND 2 VCC PGOOD 1 PVCC 22 VOUT 3 2 VSEN_REM- ISFETDRV2 3 4 PGND1.4 5 ISET 6 ISHARE ISFETDRV FSYNC_IN2 CLK_23 7 9 10 ISET2 PGOOD ISL8200M VSEN_REM+2 4 C209 10u U201 VIN RM+2 0 23 5 TP34 15 N.C. PVIN C210 2.2u EN 1.47k R221 6 PVCC2 14 C204 100p VOUT 13 VOUT_SET2 19 VIN2 PVIN1 0 R219 DNP PGND R203 1 EN_BUS 12 18 1n FSYNC_IN C211 PH_CNTRL 0 ISHARE_BUS FF R206 RM-2 VCC2 R236 DNP R235 PVIN1 DNP ISFETDRV2 AN1544.0 February 23, 2010 FIGURE 3. SIMPLIFIED SCHEMATIC PER PHASE ISFETDRV Application Note 1544 11 FF_BUS 8 PH_CNTRL2 C212 DNP_10n CLKOUT 3 R223 DNP_0 DNP ISL8200MEVAL2PHZ Schematic PVIN1 TP1 V12 TP32 C3 EN_BUS FF_BUS 1 C15 DNP C9 330uF C25 DNP C12 DNP C24 DNP C19 330uF C35 DNP C51 DNP C34 DNP C47 DNP J4 R4 DNP C94 1u R60 3.3k R56 D1 806 1 8 7 6 5 VDD LO HB VSS HO LI HS HI 2 2 R62 100k TP15 VOUT C49 1uF Isen+ R63 5k 3 3 1 R65 DNP_0.1Ohm SW1 1 Q21 2N7002 Q22 2N7002 R67 0.1ohm C95 2.2u 2 2 LED301 2 GRE EN TP50 GND 34 RED TP10 Vout Ground 2 SYS_ISH_BUS R315 CLK_12 SYS_ISH_BUS 10k CLK_OUTCLK_23 R215 10k R317 2 1 17 C205 DNP C201 DNP 2N7002DW Q203 C206 PGOOD C207 C202 22uF 1 VOU T_SET OCSET C305 DNP C303 22u C306 22u C301 C302 PHASE3 PGOOD C308 0.1uF 22uF R335 DNP DNP ISFETDRV3 R235 DNP ISFETDRV2 ISFETDRV 3 10k R336 DNP C307 PVIN1 R334 2N7002DW Q303 VCC3 R236 DNP PVIN1 60k R333 R309 DNP PHASE DNP 2 VCC3 VCC2 DNP 1 ISFETD RV3 2 VSEN_REM -3 3 ISFETD RV VSEN _REM - 4 PGN D1.4 7 5 ISE T ISH AR E F SYNC_I N 6 ISE T3 PH _CN TR L3 9 8 C LKOUT PGND1.23 21 20OCSET3 5 PHASE3 16 VCC ISFETDRV3 6 C309 10u ISL8200M PVCC VOUT PGOOD VOUT C208 0.1uF 22u 22u 15 22 VSEN_REM+3 19 PHASE2 C310 2.2u PGOOD RM+3 0 23 VOUT 3 2 10k 60k R233 20 OCSET2 R234 U301 VIN PGN D PVCC3 14 VOUT C203 13 ISFETDRV2 R209 DNP PHASE GND VCC2 VIN3 PVIN1 C304 100p 1.47k R321 N.C. 18 OCSET PGOOD 21 VOUT 0 VOUT_SET3 EN PVI N PGND1.23 22 1 VCC VSEN_REM+ 2 EN_BUS 12 ISH AR E_BUS 11 VOU T_SET ISF ETDRV2 VSEN_REM -2 1 2 3 ISFETD RV VSEN _REM - ISE T 5 4 ISE T2 FSYNC _IN2 6 ISH AR E C LK_23 8 10 7 FSYNC_IN PGN D1.4 PGOOD 23 R303 1 17 PHASE2 16 U201 ISL8200M PVCC C311 1n RM+2 0 RM-3 R319 DNP 4 C209 10u N.C. VIN R306 0 1.47k R221 5 TP34 15 EN PVIN C210 2.2u C204 100p 6 13 PVCC2 14 VOUT_SET2 VOUT VIN2 PVIN1 FF_BUS R219 DNP 19 EN_BUS 12 0 C312 DNP_10n PGN D R203 1 18 1n 9 PH _CN TR L2 0 C211 C LKOUT FF R206 ISH AR E_BUS 11 FF_BUS PH _CN TR L C212 DNP_10n RM-2 PH _CN T R L R223 DNP_0 DNP FF R211 10k JP301 R311 DNP R217 10k ISFETDRV 4 1 10 JP201 2 Application Note 1544 Q302 2N7002LT1 1 PGOOD Q19 SUD50N03-07 TP16 3 1 R325 3.3k C38 1uF SUD50N03-07 R ED 4 GREEN TP301 31 2 R61 402 V12 VCC3 R324 3.3k 1 HIP2100 R58 D2 806 1 TP31 GND CR1 Transient Load GND Q17 3 2 R57 402 GND 3 4 R2 2.05k R59 3.3k 1 JP1 U6 1 2 3 4 2 1 C39 DNP 1 270uF C21 DNP 3 C18 DNP 2 VOUT VOUT VOUT 3 R3 DNP Vcore VOUT J3 R1 8.25k VOUT TP20 TP8 V12 PVIN1 AN1544.0 February 23, 2010 Application Note 1544 ISL8200MEVAL2PHZ Bill of Materials REF DES. C3 PART NUMBER QTY MANUFACTURER DESCRIPTION 35ME270AX 1 SANYO CAP, RADIAL, 10X16, 270µF, 35V, 20%, AL.EL., ROHS C204, C304 ECJ-1VC1H101J 2 PANASONIC CAP, SMD, 0603, 100pF, 50V, 5%, COG, ROHS C211, C311 GRM188R71H102KA 2 MURATA CAP, SMD, 0603, 1000pF, 50V, 10%, X7R, ROHS C208, C308 GRM39X7R104K025AD 2 MURATA CAP, SMD, 0603, 0.1µF, 25V, 10%, X7R, ROHS C94 GRM188R61E105KA12D 1 MURATA CAP, SMD, 0603, 1µF, 25V, 10%, X5R, ROHS C38 C0805C105K4RACTU 2 KEMET CAP, SMD, 0805, 1µF, 16V, 10%, X7R, ROHS C0805X5R160-106KNE 2 VENKEL CAP, SMD, 0805, 10µF, 16V, 10%, X5R, ROHS ECJ-2FB1E225K 3 PANASONIC CAP, SMD, 0805, 2.2µF, 25V, 10%, X5R, ROHS C1206X5R160-226KNE 2 VENKEL CAP, SMD, 1206, 22µF, 16V, 10%, X5R, ROHS C203, C206, C303, C306 GRM32ER61E226KE15L 4 MURATA CAP, SMD, 1210, 22µF, 25V, 10%, X5R, ROHS 2TPF330M6 2 SANYO CAP, POSCAP, SMD, 7.3X4.3X1.8, 330µF, 2V, 20%, 6mΩ, ROHS PVIN1 111-0702-001 1 JOHNSON COMPONENTS CONN-GEN, BIND.POST, INSUL-RED, THMBNUT-GND GND 111-0703-001 1 JOHNSON COMPONENTS CONN-GEN, BIND.POST, INSUL-BLK, THMBNUT-GND 1514-2 3 KEYSTONE CONN-TURRET, TERMINAL POST, TH, ROHS 31-5329-52RFX 1 AMPHENOL CONN-BNC, RECEPTACLE, TH, 4 POST, 50Ω, GOLDCONTACT, ROHS 5002 6 KEYSTONE CONN-MINI TEST POINT, VERTICAL, WHITE, ROHS BAV99LT1G 2 ON SEMICONDUCTOR DIODE-SWITCHING, SMD, SOT23, 70V, 0.2A, ROHS SSL-LXA3025IGC-TR 2 LUMEX LED, SMD, 3x2.5mm, 4P, RED/GREEN, 12/20MCD, 2V HIP2100IBZ 1 INTERSIL IC-HI FREQ BRIDGE DRIVER, 8P, SOIC, 100V, ROHS ISL8200MIRZ 2 INTERSIL IC-10A DC/DC PWR SUPPLY MODULE, 23P, QFN, 15X15, ROHS Q21, Q22, Q302 2N7002-7-F 3 DIODES, INC. TRANSISTOR, N-CHANNEL, 3LD, SOT-23, 60V, 115mA, ROHS Q203, Q303 2N7002DW 2 INFINEON TECHNOLOGY TRANSIST-MOS, DUAL N-CHANNEL, SMD, 6P, SOT363, 60V, 0.3A, ROHS SUD50N03-06AP-E3 2 VISHAY TRANSISTOR-MOS, N-CHANNEL, SMD, TO-252, 30V, 90A, ROHS ERJ-3RQF1R0V 2 PANASONIC RES, SMD, 0603, 1Ω, 1/10W, 1%, TF, ROHS C209, C309 C95, C210, C310 C202, C302 C9, C19 TP20, TP34, TP50 TP15 TP1, TP8, TP10, TP16, TP31, TP32, TP301 D1, D2 CR1, LED301 U6 U201, U301 Q17, Q19 R203, R303 5 AN1544.0 February 23, 2010 Application Note 1544 ISL8200MEVAL2PHZ Bill of Materials REF DES. PART NUMBER QTY (Continued) MANUFACTURER DESCRIPTION R206, R306, RM+2, RM-2, CR0603-10W-000T RM+3, RM-3 6 VENKEL RES, SMD, 0603, 0Ω, 1/10W, TF, ROHS R215, R217, R234, R315, RK73H1JT1002F R317, R334 6 KOA RES, SMD, 0603, 10k, 1/10W, 1%, TF, ROHS 1 PANASONIC RES, SMD, 0603, 100k, 1/10W, 1%, TF, ROHS CR0603-10W-2051FT 1 VENKEL RES, SMD, 0603, 2.05k, 1/10W, 1%, TF, ROHS RC0603FR-073K32L 4 YAGEO RES, SMD, 0603, 3.32k, 1/10W, 1%, TF, ROHS CR0603-10W-4020FT 2 VENKEL RES, SMD, 0603, 402Ω, 1/10W, 1%, TF, ROHS ERJ-3EKF1471V 2 PANASONIC RES, SMD, 0603, 1.47k, 1/10W, 1%, TF, ROHS CR0603-10W-5101FT 1 VENKEL RES, SMD, 0603, 5.1k, 1/10W, 1%, TF, ROHS RC0603FR-0760K4L 2 YAGEO RES, SMD, 0603, 60.4k, 1/10W, 1%, TF, ROHS MCR03EZPFX8060 2 ROHM RES, SMD, 0603, 806Ω, 1/10W, 1%, TF, ROHS ERJ-3EKF8251V 1 PANASONIC RES, SMD, 0603, 8.25KΩ, 1/10W, 1%, TF, ROHS WSL-2512-R100F 2 DALE RES, SMD, 2512, 0.1W, 1W, 1%, TF, ROHS SW1 GT11MSCBE 1 ITT INDUSTRIES/C&K DIVISION SWITCH-TOGGLE, SMD, 6PIN, SPDT, 2POS, ON-ON, ROHS J3, J4 KPA8CTP 2 BERG/FCI HDWARE, MTG, CABLE TERMINAL, 6-14AWG, LUG&SCREW, ROHS SJ-5003SPBL 4 3M BUMPONS, 0.44inWx0.20inH, DOMETOP, BLACK R62 R2 R59, R60, R324, R325 R57, R61 R221, R321 R63 R233, R333 R56, R58 R1 R65, R67 Bottom four corners JP1, JP201, JP301 0 DO NOT POPULATE OR PURCHASE a) C12, C15, C18, C21, C24, C25, C34, C35, C49 0 DO NOT POPULATE OR PURCHASE a) R3, R4, R209, R211, R219, R223, R235, R236 0 DO NOT POPULATE OR PURCHASE b) C39, C47, C51, C201, C205, C207, C212 0 DO NOT POPULATE OR PURCHASE b) R309, R311, R319, R335, R336 0 DO NOT POPULATE OR PURCHASE c) C301, C305, C307, C312 0 DO NOT POPULATE OR PURCHASE 6 AN1544.0 February 23, 2010 Application Note 1544 ISL8200MEVAL2PHZ Board Layout FIGURE 4. TOP COMPONENTS FIGURE 5. TOP LAYER 7 AN1544.0 February 23, 2010 Application Note 1544 ISL8200MEVAL2PHZ Board Layout (Continued) FIGURE 6. 2nd LAYER FIGURE 7. 3rd LAYER 8 AN1544.0 February 23, 2010 Application Note 1544 ISL8200MEVAL2PHZ Board Layout (Continued) FIGURE 8. BOTTOM LAYER (MIRRORED) FIGURE 9. BOTTOM COMPONENTS (MIRRORED) 9 AN1544.0 February 23, 2010 Application Note 1544 Test Data for ISL8200MEVAL2PHZ Efficiency Load Regulation 100 1.006 90 1.005 5VIN 85 80 VOUT (V) EFFICIENCY % 95 12VIN 75 70 65 1.004 12VIN 5VIN 1.003 20VIN 20VIN 60 1.002 55 50 0 5 10 15 20 1.001 0 5 LOAD (A) FIGURE 10. EFFICIENCY (5, 12, 20VIN AND 1.0V VOUT) Start-up 10 15 20 LOAD (A) FIGURE 11. LOAD REGULATION(5, 12, 20VIN) Output Ripple VOUT 5VIN VOUT VOUT 12VIN PGOOD VOUT 20VIN FIGURE 12. START-UP UNDER NO LOAD, PVIN = VIN = 12V, IOUT = 0A FIGURE 13. OUTPUT RIPPLE UNDER 20A FOR PVIN = VIN = 5, 12, 20V Phases and VOUT Load Transient VOUT 5VIN VOUT 5VIN VOUT 12VIN PHASE2 VOUT 20VIN PHASE3 FIGURE 14. PHASE AND VOUT FOR PVIN = VIN = 5V IOUT STEP 10A/div FIGURE 15. LOAD TRANSIENT (0A TO 10A STEP, SLEW RATE = 10A/µs) FOR INPUT = 5, 12, 20V Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without notice. Accordingly, the reader is cautioned to verify that the Application Note or Technical Brief is current before proceeding. For information regarding Intersil Corporation and its products, see www.intersil.com 10 AN1544.0 February 23, 2010