Application Note 1907 ISL8216MEVAL1Z Evaluation Board User's Guide Description Recommended Equipment The ISL8216M is a simple and easy to use, high voltage DC/DC module. The ISL8216M is ideal for servers, 48V telecom/datacom applications, 12V/42V automotive and industrial equipment, and other distributed power converters/point-of-load (POL) applications. Only few passive components and a VOUT setting resistor are needed for a complete a high voltage power design. * 10V to 80V (or other voltage rating depending on desired input voltage for the ISL8216M) power supply with at least 2A source current capability The ISL8216MEVAL1Z provides an evaluation platform for the ISL8216M. The input voltage range is from 10V to 80V, and the output voltage is preset to five options, 5V, 12V, 20V, 24V and 30V. Any other output voltages within the range from 2.5V to 30V can be set with a single resistor. Quick Start * Electronic load capable of sinking current up to 4A * Digital multimeters (DMMs) * 100MHz quad-trace oscilloscope 1. Select the output voltage by using one of the five jumpers JP1 to JP5, for 5V, 12V, 20V, 24V or 30V. 2. Connect the VIN (J1) and PGND (J2) terminals to a power supply and connect the load to the VOUT (J4) and PGND (J3) terminals. 3. Set the input power supply to desired input voltage between 10V to 80V; note that the input voltage must be higher than the selected output voltage. 4. Enable the power supply first before turning on the load, preset the load to 0A. 5. Toggle switch SW1 to the lower position denoted "ENABLE". The PGOOD INDICATOR LED should glow in green to indicate proper operation. Use the digital multimeter to check the output voltage. VOUT SELECTION JUMPERS LOAD (0A to 4A) + + V VIN VOUT V 10V to 80V - - FIGURE 1. ISL8216MEVAL1Z BOARD IMAGE February 10, 2014 AN1907.0 1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 1-888-468-3774 | Copyright Intersil Americas LLC 2014. 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 1907 VIN ENSS EX_EN The ISL8216MEVAL1Z evaluation board has several output voltages preset for user's convenience. The 5V, 12V, 20V, 24V, and 30V can be easily selected by shorting their appropriate jumper. If any other output voltage between 2.5V and 30V is desired, the user can use a feedback resistor based on Equation 1. 11.3k V OUT = 1 + ---------------------------- 1.192V R (EQ. 1) FB NOTE: The output voltage accuracy is not only dependent on the module's internal reference voltage, but also on the feedback resistance accuracy. For higher overall output accuracy, the customer should select a high accuracy resistor (i.e; 0.5%). Programming the Switching Frequency The ISL8216M has an internally set fixed switching frequency of 300kHz. By adding a resistor between VIN and RTCT and a capacitor between RTCT and SGND, the module's switching frequency can be adjusted between 200kHz to 600kHz. The place holders for the resistor (R5) and capacitor (C5) are provided on the ISL8216MEVAL1Z evaluation board for the user's convenience. Refer to the ISL8216M datasheet for optimum switching frequency for different conditions. The SYNC pin can provide the function to synchronize the ISL8216M's switching frequency to an external source. When frequency synchronization is used, the time constant of RT/CT must be set longer than the period of the sync signal. When the external sync feature is not used, the customer should tie the SYNC pin to SGND. Optional External Enable Control Circuit The module can be enabled by an external signal by using an open-drain device, or by adding an external circuit. This optional ON/OFF VOUT Q201 Selecting Output Voltage R202 Circuits Description Q202 BIAS VOLTAGE Q203 R201 The evaluation board size is 76.2mmx76.2mm (3 inchx3 inch). The FR4 board has four layers, with 2oz copper on the top and the bottom layers, and 1oz copper on the two internal layers. The board can be used as 4A reference design. Refer to the "ISL8216MEVAL1Z Board Schematic" on page 4 and "ISL8216MEVAL1Z Layouts" on page 5. All the components on the board, including the solder attachment, are lead free. external enable circuit is provided on the ISL8216MEVAL1Z evaluation board, see Figure 2. D201 Evaluation Board Information TP14 FIGURE 2. OPTIONAL EXTERNAL ENABLE CIRCUIT To utilize the circuit shown in Figure 2, the user can place appropriate components on the place holders for R201, D201, R202, Q201, and Q202. A bias voltage of approximately 5.1V is generated from VIN with a resistor (R201) in series and a zener diode (D201). R202 is a pull-up resistor of typically 100k, and Q201 and Q202 are N-MOSFETs. The external control signal is applied to TP14 (EX_EN). When EX_EN is logic low, ENSS is pulled to ground to disable the module. When EX_EN is logic high, ENSS is released to allow the module's soft-start function. The selection of R201 in series with the zener diode D201 can be calculated as shown in Equation 2: V IN - V Z R201 = ---------------------------IZ (EQ. 2) Where: * VZ is the zener diode D201's working voltage, nominal 5.1V. * IZ is the zener diode D201's working reverse current, typically about 5mA. The power dissipation rating should be taken into consideration when selecting R201. Other External Circuits Requirements Depending on the applications conditions, other external circuits may be required. Table 1 shows these requirements. TABLE 1. EXTERNAL CIRCUITS REQUIREMENT BASED ON APPLICATION CONDITIONS CONDITIONS EXTERNAL CIRCUITS REQUIREMENTS VOUT Use PGOOD Signal Enable Method PGOOD Delay Circuit 1k Dummy Load Resistor VIN-BOOT Resistor 12V Yes/No Self or External Enable Control No No No >12V Yes Self Enable Yes Yes No >12V No Self Enable No No Yes >12V Yes External Enable Control No No Yes >12V No External Enable Control No No Yes 2 AN1907.0 February 10, 2014 Application Note 1907 Optional PGOOD Delay Circuit The ISL8216M has a PGOOD comparator which monitors the voltage on the FB pin. The PGOOD is asserted (open drain) when the FB pin voltage is within 14% of the reference voltage. The PGOOD is de-asserted under disable, overcurrent protection event, or over-temperature event. As described in Table 1, a PGOOD delay circuit, as well as a dummy load resistor of 1k, 1W rating, are required if all of the following conditions are met: * VOUT is higher than 12V * PGOOD signal is utilized The place holders for this PGOOD delay circuit (C2, R3 and M1) and the dummy load resistor (R20) are provided on the ISL8216MEVAL1Z evaluation board for the user's convenience, as shown in Figure 3, where C2 is 1F, R3 is typically 150k, and M1 is an N-MOSFET. In the case where input voltage VIN is not monotonic, an optional Schottky diode is recommended in parallel with resistor R3, to ensure that the capacitor C2 has been fully discharged when PVCC starts to rise from 0V. PGOOD C2 1F M1 2N7002 D1 R3 150k Output Capacitors The 6x22F ceramic capacitors with voltage rating of 35V have been installed on the ISL8216MEVAL1Z evaluation board. However, additional place holder to add more capacitors are provided on the board for evaluating low ESR tantalum capacitor, low ESR polymer capacitor, and low ESR aluminum electrolytic capacitor. A minimum total output capacitance of 120F with low ESR is recommended. PCOMPX Pin Configuration * Module is self enabled/disabled PVCC on VOUT capacitors due to leakage from VIN, R23, internal bootstrap diode, internal bootstrap capacitor, and inductor to VOUT capacitor. OPTIONAL DIODE Control loop is already compensated internally to provide sufficient stability margins for applications with various types of output capacitors. For all ceramic output capacitors, short the PCOMPX pin to VOUT; a 0 resistor R1 is provided on the evaluation board. For tantalum capacitors, polymer capacitors, or aluminum electrolytic capacitors, change R1 to resistance of lower than 1k. The lower the total ESR, the lower the R1 value should be. Radiated Emission The ISL8216M has been evaluated with respect to CISPR 22 radio disturbance limits class B. The radiated emission test was performed with a simple input filter installed on the ISL8216MEVAL1Z evaluation board, as shown in Figure 3. Figure 15 and Figure 16 show the radiated emissions plots with respect to the CISPR 22 radio disturbance limits class B at typical operating conditions of 24VIN to 5VOUT at 4A and 24VIN to 12VOUT at 4A. INPUT FILTER FIGURE 3. OPTIONAL PGOOD DELAY CIRCUIT WITH DIODE For VOUT>12V and light load condition, if the optional PGOOD delay circuit is not used during VIN ramp up, PGOOD logic can malfunction due to low VOUT as a result of bootstrap capacitor not being fully charged. This issue can be solved by adding a delay of about 250ms with this optional delay circuit. Resistor Between VIN and BOOT 100nH VIN ISL8216M VIN 10F 2.2Fx4 VDD FIGURE 4. OPTIONAL INPUT FILTER FOR IMPROVED EMI PERFORMANCE As described in Table 1, a resistor between VIN and BOOT is recommended if ANY of the following conditions are met: * VOUT is higher than 12V and PGOOD signal is not utilized. * VOUT is higher than 12V, PGOOD signal is utilized, and module is enabled/disabled by an external control signal. The place holder for this resistor, R23, is provided on the ISL8216MEVAL1Z evaluation board for the user's convenience. Refer to the ISL8216M datasheet for the selection of this resistor. A minimum 0.25W power rating is recommended for this resistor. An additional N-MOSFET along with the external enable circuit is required when R23 is populated. This N-MOSFET is used for pulling VOUT to ground when the external control signal is logic low. Without this N-MOSFET, a residual voltage can be generated 3 AN1907.0 February 10, 2014 ISL8216MEVAL1Z Board Schematic OPTIONAL EXTERNAL ENABLE CIRCUIT PGOOD INDICATOR R30 R201 PVCC TP10 IN 1 1 IN 2 A14 A12 A11 F8 A8 A7 PAD1 A5 D B3 E TP14 A3 C5 PGOOD C E E RTCT SYNC FB OUT OPTIONAL PGOOD DELAY CIRCUIT FB C1 PGOOD OUT FB R23 PVIN IN IN C4 DNP 0805 ENSS E14 ENABLE 2 OUT ENSS PAD2 VIN 1 0.1UF ENSS PGND PCOMPX 3 1 SW1 DISABLE 1 1 PCOMPX IN 1 JP1 JP2 JP3 JP4 JP5 PAD3 PHASE VOUT C18 1 PVIN BLACK J2 1 IN E E DRAWN BY: BLACK J3 PGND IN TIM KLEMANN DATE: RELEASED BY: DATE: DATE: NET_SHORT ENGINEER: 07/26/2013 UPDATED BY: TIM KLEMANN E ISL8216M EVALUATION BOARD SCHEMATIC 07/31/2013 MASK# C REV. HRDWR ID ISL8216MEVAL1Z FILENAME: ~/ISL8216M/ISL8216MEVAL1ZD AN1907.0 February 10, 2014 FIGURE 5. ISL8216MEVAL1Z BOARD SCHEMATIC DATE: TAO TAO TITLE: TESTER E D PGND TP7 DNP POS_CAP C112 2 1 DNP POS_CAP C111 2 C28 22UF C27 22UF C26 22UF 22UF C25 C24 22UF 22UF 35V DNP C23 220UF 50V 1 C21 30V OUT 2 C16 2.2UF 100V C15 2.2UF 100V C14 2.2UF 100V C13 2.2UF 100V PAD5 PHASE PAD4 OUT 2 DNP 2512 2 J1 J4 R20 24V OUT 590 RFB5 RED TP15 E 2 D GND TP5 TP6 20V OUT 715 RFB4 OUT RED PGND 5V OUT 3.48K RFB3 2 464 PVIN D VOUT 2 TP8 0 0603 VOUT 12V OUT 1.24K RFB2 D R1 ALL PARTS ARE (DNP) RFB1 2 68UF 100V 2 DNP R3 BOOT C11 SGND ISL8216MIRZ-REVC DNP 1 OPEN M1 2N7002-7-F 3 C2 IN U1 PGOOD F1 PVCC BOOT COMP E1 1 RTCT FB D1 OCSET SHEET 1 OF D 1 Application Note 1907 B1 VCC UGATE SGND PVCC A1 PGND D PGND E ALL PARTS ARE (DNP) Q1 2N7002-7-F TP11 3 SYNC 4 C12 10UF R6 DNP R5 DNP 0805 OUT OUT OPEN 2 TP1 RTCT DNP Q203 3 2 2N7002-7-F DNP 3 1 VOUT LED1 SSL_LXA3025IGC PVCC 2 DNP 3 Q202 2 DNP 1 A NC E PVIN IN EX_EN R31 3.32K E 1 IN 2N7002-7-F DNP BZX84C5V1LT1 D201 1 IN GRN C 4 2 ENSS 3.32K RED 3 R202 DNP Q201 2N7002-7-F PVIN IN 3 IN Application Note 1907 ISL8216MEVAL1Z Layouts FIGURE 6. TOP SILK SCREEN FIGURE 7. TOP LAYER COMPONENT SIDE 5 AN1907.0 February 10, 2014 Application Note 1907 ISL8216MEVAL1Z Layouts (Continued) FIGURE 8. LAYER 2 FIGURE 9. LAYER 3 6 AN1907.0 February 10, 2014 Application Note 1907 ISL8216MEVAL1Z Layouts (Continued) FIGURE 10. BOTTOM LAYER SOLDER SIDE FIGURE 11. BOTTOM SILK SCREEN 7 AN1907.0 February 10, 2014 Bill of Materials PART NUMBER H1046-00104-50V10-T H1065-00106-25V10-T REF DES QTY VALUE TOL. VOLTAGE POWER PACKAGE TYPE C4 1 0.1F 10% 50V 805 MANUFACTURER Various C12 1 10F 10% 25V 1206 Various C13-C16 4 2.2F 10% 100V 1210 Various 100ME68AX C18 2 68F 20% 100V THOLE Sun Electronic Industries EEV-FK1H221P C21 0 DNP H1082-00225-100V10-T SMD 6 22F C111, C112 0 DNP 108-0740-001 J1-J4 4 69190-202HLF JP1-JP5 5 THOLE LED1 1 2N7002-7-F-T Q1 1 H2511-00R00-1/10W-T R1 1 0 H2515-DNP R20 0 DNP SSL-LXA3025IGC-TR 20% 35V 1206 TDK SMD 1% 1/10W Aluminum Electrolytic Capacitor Multilayer Ceramic Capacitor Tantalum Capacitor - Polymer SMD Johnson Components Banana Jack BERG/FCI Jumper SMD LUMEX 3mmx2.5mm Surface Mount LED SOT-23 Various N-Channel 60V 115mA MOSFET 603 Various Thick Film Chip Resistor 2512 H2511-03321-1/10W1-T R30, R31 2 3.32k 1% 1/10W 603 Various Thick Film Chip Resistor H2511-01241-1/10W1-T RFB1 1 1.24k 1% 1/10W 603 Various Thick Film Chip Resistor H2511-03481-1/10W1-T RFB2 1 3.48k 1% 1/10W 603 Various Thick Film Chip Resistor H2511-07150-1/10W1-T RFB3 1 715 1% 1/10W 603 Various Thick Film Chip Resistor H2511-05900-1/10W1-T RFB4 1 590 1% 1/10W 603 Various Thick Film Chip Resistor H2511-04640-1/10W1-T RFB5 1 464 1% 1/10W 603 Various Thick Film Chip Resistor GT11MCBE SW1 1 ITT CANNON SPDT Toggle Switch ROHS TP1, TP5-TP8, TP10, TP11, TP14, TP15 9 Keystone Test Point White U1 1 Intersil 15mmx15m DC/DC Power Module 5002 ISL8216MIRZ THOLE HDA Application Note 1907 C23-C28 16TQC68MYF Multilayer Ceramic Capacitor Aluminum Electrolytic Capacitors - SMD 8 C3216X5R1V226M160AC-T DESCRIPTION AN1907.0 February 10, 2014 Application Note 1907 Efficiency Performance 100 100 95 24VIN TO 5VOUT 300kHz 95 90 EFFICIENCY (%) EFFICIENCY (%) 90 85 80 75 48VIN TO 5VOUT 300kHz 70 36VIN TO 5VOUT 300kHz 65 60 75 48VIN TO 12VOUT 400kHz 70 64VINTO 12VOUT 350kHz 65 50 60 1 2 3 4 36VIN TO 12VOUT 400kHz 80 55 0 24VIN TO 12VOUT 400kHz 85 80VIN TO 12VOUT 350kHz 0 1 LOAD CURRENT (A) FIGURE 12. EFFICIENCY vs LOAD CURRENT (5VOUT AT 300kHz) 2 LOAD CURRENT (A) 4 3 FIGURE 13. EFFICIENCY vs LOAD CURRENT (12VOUT) 100 95 64VIN TO 24VOUT 400kHz EFFICIENCY (%) 90 48VIN TO 24VOUT 450kHz 85 80 75 80 VIN TO 24VOUT 350kHz 70 65 60 0 1 2 LOAD CURRENT (A) 3 4 FIGURE 14. EFFICIENCY vs LOAD CURRENT (24VOUT) 9 AN1907.0 February 10, 2014 Application Note 1907 Radiated Emission Performance CISPR 22 CLASS B FIGURE 15. RADIATED EMISSION AT 24V IN 5VOUT 4A CISPR 22 CLASS B FIGURE 16. RADIATED EMISSION AT 24V IN 12VOUT 4A 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. 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