Application Note 1738 ISL8200AMEV1PHZ Evaluation Board User’s Guide VIN = 3V TO 20V PGOOD VOUT REMOTE SENSING POINTS MODULE GROUP VOUT LOAD UP TO 10A DIMENSIONS: 2.5 X 4.5 INCHES VOUT MONITORING POINTS FIGURE 1. ISL8200AMEV1PHZ EVALUATION BOARD ISL8200AMEV1PHZ Evaluation Board The ISL8200AM is a complete 10A step-down current share-able switch mode power module in a low profile package. It can be used in standalone single-phase operation as well as current shared applications where multiple modules are connected in parallel. The ISL8200AMEV1PHZ evaluation board is used to demonstrate performance of the ISL8200AM in a single phase setup. The input voltage is from 3V to 20V, and the output can support a 10A maximum load with a voltage range from 0.6V up to 6V with the proper output capacitor rating. • 0V to 20V power supply with at least 15A source current capability. • One Electronic Load capable of sinking current up to 10A. • Digital multi-meters (DMMs). Quick Start 1. Connect the PVIN and GND banana jacks to a power supply and connect a load to the VOUT and GND lugs. 2. A multimeter can be hooked to TP310 (+) and TP34 (-) to monitor VOUT. 3. Open the jumpers marked PVIN and VCC. 4. Short the jumpers marked 1.2V and FIXED. This sets the output voltage to 1.2V and sets the OCP trip point to its open condition. 5. Push the toggle on SW1 to the left (with respect to the board above). 1 7. Set the electronic load to a desired load current. 8. Enable the power supply first and then the load; the LED for PGOOD will be red when the module is not regulating. 9. Push the toggle on SW1 to the right; the PGOOD LED should now be green to indicate proper operation. Shutdown 1. Disable the device by pushing the toggle on SW1 to the left. 2. Turn off the electronic load. 3. Turn off the power supply. Circuits Description Recommended Equipment May 10, 2012 AN1738.0 6. Set the input supply to 12V. PVIN and GND banana plugs are the input power terminals. Two input electrolytic capacitor footprints are provided to handle the input current ripple. Two Sanyo Poscaps (2TPF330M6, 330µF, ESR 6mΩ) are used as output E-caps. These poscaps are rated for output voltages up to 2V, so they should be removed if a higher VOUT is required. The footprints of the Sanyo capacitors can accommodate T530 (ultra-low ESR) tantalum capacitors for higher voltages. VOUT and GND are output lugs for load connections. VSEN+ and VSEN- 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 need to be changed to higher values, such as 10Ω. To assess stability, RM+2 can be changed to a 100Ω resistor, then inject the signal across VSEN+ and VSEN_PRIME. CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 1-888-468-3774 | Copyright Intersil Americas Inc. 2012. All Rights Reserved Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries. All other trademarks mentioned are the property of their respective owners. Application Note 1738 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 the module causes a second module to switch with a phase shift of 180°. This can be demonstrated on the 2-phase evaluation board, ISL8200AMEVAL2PHZ. For example, in a 5V application where it is desired to have the part turn off at 4V and recover at 4.5V, the VHYS that goes in Equation 3 is 0.5V. R203 and C210 are small added filters for the VIN pins. The Overcurrent Protection (OCP) limit can be controlled by shorting the jumper marked FIXED and populating a resistor in R209A’s location, as per your desired OCP trip point. As another option, by shorting the jumper marked ADJ1, you can tune the OCP level using the potentiometer labeled R241. To measure the resistance of R241, simply turn off the part and remove the short across ADJ1 and place a resistance meter across it’s terminals. If the application is in the 3.3V range, tie VIN and PVCC to 5.0V. However, in applications that involve a PVIN greater than 5.5V, open the jumper named PVIN, not doing so will increase the probability of tying VCC to a voltage greater than its capability. Shorting the jumper marked VCC will allow you to use a separate power supply for VCC; however this is not a necessity as VCC can be internally generated within the module. Evaluating Other Output Voltages The ISL8200AMEV1PHZ kit has several preset outputs for convenience. 1.2V, 1.5V, 1.8V, 2.5V, 3.3V and 5.0V can be easily selected by shorting their appropriate jumper. There is also a potentiometer provided that will allow for any other output voltage between 0.6V to 6V. Equation 1 governs the relationship between the VSET resistors (R221A thru R221F) and the output voltage. ( V OUT – V REF ) where VREF = 0.6V R221X = ------------------------------------- ROS ( V REF ) (EQ. 1) ROS = 2.2kΩ internal The output capacitors (C9 and C19) 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 modifying the voltage divider at the EN pin connected to the input rail (R1 and R2), the input UVLO and its hysteresis can be programmed. The ISL8200AMEV1PHZ evaluation board comes stocked with R1 = 8.25kΩ and R2 = 3.01kΩ; this sets the UVLO level at 2.9V for a 3.3V application. For a 5V application, with a UVLO at 4V and recover at 4.5V, use R1 = 16.6kΩ and R2 = 4.2kΩ. The UVLO equations are re-stated in the following, where R1 and R2 are the upper and lower resistors of the voltage divider at the EN pin respectively, VHYS is the desired UVLO hysteresis and VFTH is the desired UVLO falling threshold; a user selected value. Equation 2 describes VHYS as the point past the programmed UVLO level at which the device turns on again. 2 (EQ. 2) UVLO TURN – ON = V HYS + V FTH V HYS R1 = ------------I HYS R 1 ⋅ V ENREF R2 = --------------------------------------V FTH – V ENREF IHYS = N x 30µA (EQ. 3) N = number (EQ. 4) VENREF = 0.8V 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 = 53.33kΩ and R2 = 5.2kΩ. Efficiency Measurement 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 PVIN_TP terminal, and the measuring point for the output voltage meter is at the TP310 terminal. The efficiency equation is shown in Equation 5: ( V OUT • I OUT ) P OUT Output Power Efficiency = ----------------------------------- = ------------- = ----------------------------------P IN ( V IN • I IN ) Input Power (EQ. 5) 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 oscilloscopeprobe 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. OUTPUT CAP OUTPUT OUTPUT CAP CAP OR MOSFET FIGURE 2. OUTPUT RIPPLE/NOISE MEASUREMENT AN1738.0 May 10, 2012 ISL8200AMEV1PHZ Schematic 39,1 8) 8) 3*22' TP310 R325 FIXED 2 2 3 2 3*22' C201 C205 Q302 1 2 '13 8) 8) 1 3+$6( TP301 3 R209A 19 C202 C206 9287 7%' 7%' 39,1 R241 8) 2 . C203 18 1 66/B/;$,*& LED301 1 ADJ1 1 R240 VOUT & 8) 9&& 4 20 1 . 3 R324 9&& 1 . 2 . 1 R221C 1.8V 2 1 . VSEN+_PRIME J4 GRN PGND VSEN+ RED 17 9287 21 PVIN *1' 9287 22 PHASE 3+$6( 86( *50%5$.(/ 8) . 1 VCC OCSET IS L 8 2 0 0 A M IR Z ,6/0,5= R221A NC PGOOD C234 PGND1 16 23 R221B 1.5V 2 4 1.2V 10UF 8) C209 1 5 PVCC 15 8) 2 6 U1 C210 3 7 8 10 9 11 R206 VIN C255 8) 3) C204 3 . 1 RM+2 1 . 1 1 ADJ 2 2 2 1 . . 1 R221E 3.3V 2 R221D 2.5V 2 C232 C207 8) 7%' C233 C230 8) 8) DRAWN BY: DATE: ENGINEER: RELEASED BY: DATE: TITLE: UPDATED BY: DATE: .,5$1 %(51$5' .,5$1 %(51$5' DATE: ,6/0(9$/3+= C231 8) C251 8) C250 TESTER MASK# 8) FILENAME: HRDWR ID REV. SHEET OF Application Note 1738 VOUTSET PGND1 ISFETDRV ISET EN 13 14 TP34 VSEN_REM- FSYNC_IN ISHARE CLKOUT 12 VOUT R221_ADJ PH_CNTRL (1B%86 3) R203 FF 39,1 ISHARE_BUS C211 C254 C253 8) 7%' 7%' C12 7%' C25 7%' C51 3) ))B%86 7%' R221F 5.0V R219 ,6)(7'59 C212 '13 R223 '13 &/. RM-2 . &/. 3 R211 C24 7%' R217 ,6)(7'59 HEADER1 1 12 2 VSENC236 1 '13 2 C001 (1B%86 . JP201 C19 7%' R215 *1' C252 C235 8) 1 C9 PVIN_TP VCC_GND 1 9287 9&& 2 2 PVIN 8) VCC 1 VCC_PWR 2 R3 R4 R2 . J2 '13 ))B%86 3 SW11 '13 R1 . 1 8) C15 2 2 2 C3 39,1 8) 1 J1 AN1738.0 May 10, 2012 Application Note 1738 ISL8200AMEV1PHZ Bill of Materials REF DES. PART NUMBER ADJ, VCC, 1.2V, 1.5V, 1.8V, 2.5V JUMPER2_100 3.3V, 5.0V, ADJ1, FIXED, JP201 QTY MANUFACTURER DESCRIPTION 11 Generic Two Pin Jumper 1 Panasonic Capacitor, 2200pF, 10%, 50V, 0603 C12, C25 2 DNP Capacitor, 0805 C201 1 DNP Capacitor, 1206 GRM32ER61E226KE15L 3 Murata Capacitor, 22uF, 10%, 25V, 1210 C204 H1045-00101-50V5 1 Generic Capacitor, 100pF, 5%, 50V, 0603 C209 GRM21BR71A475KA73 1 Murata Capacitor, 10µF, 10%, 10V, 0805 C210 GRM21BR71E225KA73L 1 Murata Capacitor, 2.2µF, 10%, 25V, 0805 C211 H1045-00102-50V10 1 Generic Capacitor, 1000pF, 10%, 50V, 0603, 3 DNP Capacitor, 0603 C001 C202, C203, C206 ECJ-1VB1H222K C212, C235, C236 C230, C232, C250, C252-C255 C2012X7R1E105K 7 TDK Capacitor, 1µF, 10%, 25V, 0805 C231, C233, C251 H1046-00104-25V10 3 Generic Capacitor, 0.1µF, 10%, 25V, 0805 C3225X7R1E106M 1 TDK Capacitor, 10µF, 20%, 25V, 1210 4 DNP Capacitor, 1210 C234 C24, C51, C205, C207 C3, C15 35MV270AX 2 Sanyo Capacitor, 270µF, 20%, 35V, Radial C9, C19 2TPLF330M7 2 Sanyo Capacitor, 330µF, 20%, 2V, SMD HEADER1 TSW-102-07-L-S 1 Generic 2 Pin Header J1 111-0702-001 1 JOHNSON-COMP Binding Post (Red) J2 111-0703-001 1 JOHNSON-COMP Binding Post (Black) J4, VOUT KPA8CTP 2 Burndy Wire Connector Lug LED301 SSL-LXA3025IGC 1 Lumex 3.5mmx2.5mm SMD Red/Green LED 2N7002L 1 On-Semi N-Channel 60V 115mA MOSFET (SOT23) R1 H2511-08251-1/16W1 1 Generic Resistor, 8.25kΩ, 1%, 1/16W, 0603 R2 H2511-03011-1/16W1 1 Generic Resistor, 3.01kΩ, 1%, 1/16W, 0603 R203 H2511-00010-1/10W1 1 Generic Resistor, 1Ω, 1%, 1/10W, 0603 ERJ3GEY0R00V 3 Panasonic Resistor, 0Ω, 0%, 1/10W, 0603 H2505-DNP-DNP-R1 4 DNP Resistor, 0603 H2511-01002-1/10W1 3 Generic Resistor, 10kΩ, 1%, 1/10W, 0603 3262W-1-203 1 Bourns Potentiometer, 20kΩ, 10%, 1/4W, RADIAL R221A H2505-02201-1/16WR1 1 Generic Resistor, 2.2kΩ, 0.1%, 1/16W, 0603 R211B H2511-03321-1/16W1 1 Generic Resistor, 3.32kΩ, 0.1%, 1/16W, 0603 R221C H2511-04421-1/16W1 1 Generic Resistor, 4.42kΩ, 0.1%, 1/16W, 0603 R221D H2511-06981-1/16W1 1 Generic Resistor, 6.98kΩ, 0.1%, 1/16W, 0603 R221F H2511-01622-1/16W1 1 Generic Resistor, 16.2kΩ, 0.1%, 1/16W, 0603 R240 H2510-06200-1/16W1 1 Generic Resistor, 620Ω, 1%, 1/16W, 0603 R241 SM-3TW104 1 Copal Potentiometer, 100kΩ, 20%, 0.125W, SMD H2505-DNP-DNP-1 2 DNP Resistor, 0603 H2505-03301-1/16WR1 2 Generic Resistor, 3.3kΩ, 0.1%, 1/16W, 0603 Q302 R206, RM+2, RM-2 R211, R219, R233, R209A R215, R217, R221E R221_ADJ R3, R4 R324, R325 4 AN1738.0 May 10, 2012 Application Note 1738 ISL8200AMEV1PHZ Bill of Materials REF DES. SW1 PART NUMBER QTY (Continued) MANUFACTURER DESCRIPTION GT11MSCBE-T 1 C&K Switch, SPDT Toggle TP301, VSEN+, VSEN-, VSEN_PRIME 5002 4 Keystone Miniature White Test points 0.100 pad with 0.040 t-hole TP34, TP310, PVIN_TP, VCC_GND, VDD_PWR 1514-2 5 Keystone Test point, Turret, 0.150 pads with 0.100 t-hole ISL8200AMIRZ 1 Intersil Current-Share Capable 10A DC/DC Power Module U1 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 5 AN1738.0 May 10, 2012