Evaluating the HIP6016 PWM Controller Using a HIP6018EVAL1 Board ® Technical Brief July 1998 TB369 Author: Bogdan M. Duduman Introduction The HIP6016 and HIP6018 are both advanced PWM and dual linear controller ICs, aimed at providing the power control and protection for three output voltages in highperformance embedded microprocessor applications [1, 2]. Since the 1.5V GTL bus and the 2.5V system clock are widely used voltages in Intel-based microprocessor systems, in order to facilitate a reduced system cost as well as to simplify the practical implementation, the HIP6016 integrates the resistor dividers required by the HIP6018 to set the output voltage of the two linear regulators. Additionally, the HIP6016 is equipped with an extended DAC reference range (1.3VDC to 3.5VDC, as opposed to HIP6018’s 1.8VDC to 3.5VDC). Background Details Integrating the resistor dividers on the HIP6016, as seen in Figure 1, fixes both linear outputs. Specifically, VSEN3 is regulated to 1.5V ±2.5% and VOUT2 is regulated to 2.5V ±2.5%. The impedance seen into the HIP6016 VSEN pins is around 50kΩ for VSEN3 and around 60kΩ for VSEN2. The absolute values of the internal resistors vary significantly with temperature and process, so connecting external series resistors on the VSEN lines in order to increase the output voltages is not recommended. If output voltages other than 1.5V and 2.5V are required, we recommend the use of the HIP6018. HIP6016 Evaluation Given the pin-to-pin compatibility to HIP6018, the HIP6016 can be evaluated in a HIP6018EVAL1 evaluation board [3] after performing a couple of minor modifications. Since the linear regulators’ feedback pins on HIP6018 became voltage sensing pins on HIP6016, R11 and R13 (see Figure 2 on next page) need to be shorted out in order to provide a direct connection to the respective output voltages for both VSEN2 and VSEN3. We recommend first removing the resistors, then placing 0Ω, 0.1W, 0805 resistors in both locations. In the absence of 0Ω resistors, small pieces of bare wire or solder drops can be used to short-out both locations. Second modification is the obvious one, namely replacing the HIP6018 with a HIP6016. Removal of R12 and R14 is totally optional. HIP6018 HIP6016 FB3 3.3V + VIN2 + - + VOUT2 - 3.3V + - + 1.265V 0.3V + GATE3 + + VIN2 - 0.3V + GATE3 - VSEN3 VOUT2 + + - + - 1.265V FB2 VSEN2 FIGURE 1. SELECT HIP6016 AND HIP6018 BLOCK DIAGRAM DETAILS 4-1 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. 2002. All Rights Reserved Technical Brief 369 +12VIN F1 +5VIN +3.3VIN 15A L1 1μH C1-7 6x680μF VIN2 C19 1000μF GND Q3 RFD3055 GATE3 VCC_VTT FB3 C43 1000μF R11 0 VCC C16 1μF 1 12 20 OCSET1 7 14 15 16 R12 1K FB2 C47 270μF R13 0 HIP6016 11 R14 1K 1K 1K 22 LGATE1 Q2 HUF76143 18 13 R25 Q1 HUF76143 21 VOUT2 PGOOD 1000pF R2 24 UGATE1 PHASE1 23 19 VCC_CLK C14-15 2x1μF C18 17 PGND PWRGOOD L3 3.5μH VCC_CORE C24-30 7x1000μF R4 4.99K VSEN1 R8 FB1 2.21K C41 COMP1 C40 0.68μF 10pF C42 R10 2.2nF 160K R9 750K REQUIRED REPLACEMENTS FIGURE 2. HIP6016 EVALUATION SCHEMATIC DETAIL (MODIFIED HIP6018EVAL1) References For Intersil documents available on the internet, see web site http://www.intersil.com. [1] HIP6016 Data Sheet, Intersil Corporation, FN4566. [2] HIP6018 Data Sheet, Intersil Corporation, FN4497. [3] AN9805 Application Note, Intersil Corporation, “Desktop Microprocessor Computer Power Systems Using the HIP6018 Controller (HIP6018EVAL1)”. All Intersil U.S. products are manufactured, assembled and tested utilizing ISO9000 quality systems. Intersil Corporation’s quality certifications can be viewed at www.intersil.com/design/quality Intersil products are sold by description only. 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 data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries. For information regarding Intersil Corporation and its products, see www.intersil.com 4-2