ZL8800-2PH-DEMO1Z Renesas

Application Note 1901 Author: Philip McKenzie ZL8800-2PH-DEMO1Z Demonstration Board The ZL8800 is a digital power conversion and management IC Target Specifications that combines an efficient step-down DC/DC converter with V = 12V key power and thermal management functions in a single IN package. The ZL8800 incorporates compensation-free V = 1.2V/60A max OUT ChargeMode control to achieve single-cycle transient response. f = 400kHz SW The ZL8800-2PH-DEMO1Z demonstration board is a 6-layer Efficiency: 91% at 40A board demonstrating a 2 phase 60A synchronous buck Output Ripple: 1% converter. Sequencing, margining, plus other features can be evaluated using this demonstration board. Dynamic response: 1% (50% to 100% to 50% load step, di/dt = 10A/s) A USB to PMBus adapter board is used to connect the Board temperature: +25C demonstration board to a PC. The PMBus command set is accessed by using the Zilker Labs PowerNavigator evaluation software from a PC running Microsoft Windows. Functional Description The ZL8800-2PH-DEMO1Z provides all circuitry required to Key Features demonstrate the features of the ZL8800. The ZL8800-2PH-DEMO1Z has a functionally-optimized ZL8800 2 phase 60A synchronous buck converter with circuit layout that allows efficient operation up to the compensation-free ChargeMode control maximum output current. Designed to be easy to use and modify. Optimized for small circuit footprint and dynamic response A majority of the features of the ZL8800, such as compensation-free ChargeMode control, soft-start delay and Configurable through PMBus ramp times, supply sequencing, voltage tracking, and voltage V range of 4.5V to 14V, V adjustable from 0.54 to 5.5V IN OUT margining are available on this demonstration board. For Enable switches and power-good indicators voltage tracking and sequencing demonstration, the board can be connected to any other Zilker Labs demonstration board Ordering Information that supports the Digital-DC (DDC) bus. Figure 1 shows a simplified schematic diagram of the PART NUMBER DESCRIPTION ZL8800-2PH-DEMO1Z board. ZL8800-2PH-DEMO1Z ZL8800 Demonstration Kit (EVB, USB Adapter, Cable) VIN VIN VDD VDRV 4.5V - 14V ZL8800 EN0 PWMH0 PWM BST EN1 Control & EN Status PWML0 PG0 Vsw PG1 GND VOUT ISENA0 0.6V - 5V ISENB0 Inter-Device DDC Communication VIN VDRV PWMH1 PWM BST EN PWML1 Vsw SDA GND PMBus SCL SALRT ISENA1 ISENB1 VSENP VSENN GND FIGURE 1. ZL8800-2PH-DEMO1Z SIMPLIFIED SCHEMATIC October 31, 2013 CAUTION: These devices are sensitive to electrostatic discharge follow proper IC Handling Procedures. 1 1-888-INTERSIL or 1-888-468-3774 Copyright Intersil Americas LLC 2013. All Rights Reserved AN1901.0 Intersil (and design), PowerNavigator and Digital-DC are trademarks owned by Intersil Corporation or one of its subsidiaries. All other trademarks mentioned are the property of their respective owners. VDD VDD DrMOS DrMOS Vin VinApplication Note 1901 The hardware enable function is controlled by a toggle switch on Quick Start Guide the ZL8800-2PH-DEMO1Z board. The power-good (PG) LEDs indicate the correct state of PG for each phase when external Stand Alone Operation power is applied to the ZL8800-2PH-DEMO1Z board and the 1. Set ENABLE switch to DISABLE corresponding phase is functioning properly. The right angle 2. Apply load to VOUT0 and/or VOUT1 headers at opposite ends of the board are for connecting a USB to PMBus adapter board or for daisy chaining multiple 3. Connect the USB to PMBus adapter board to J8 (labeled demonstration boards together to build multi-output DONGLE) of ZL8800-2PH-DEMO1Z configurations. 4. Connect supplied USB cable from computer to USB to PMBus adapter board Figures 2 and 3 show the detailed demonstration circuit. Figure 2 shows the ZL8800 IC with its minimal component count to 5. Connect power supply to VIN (supply turned off) realize a 60A output. Figure 3 has interface circuitry unique to 6. Turn power supply on the demonstration board that is not typically contained in a 7. Set ENABLE switch to ENABLE users application circuit. Figures 4 through 10 show typical 8. Monitor ZL8800-2PH-DEMO1Z board operation using an performance data, and Figures 15 through 22 demonstrate the oscilloscope PCB board layout. The default configuration file is shown on page 6, and the Bill of Materials (BOM) is included for reference USB (PMBus) Operation beginning on page 5. 1. Set ENABLE switch to DISABLE Operation 2. Apply load to VOUT and/or VOUT1 3. Connect power supply to VIN (supply turned off) PMBus Operation 4. Turn power supply on The ZL8800 utilizes the PMBus protocol. The PMBus functionality can be controlled via USB from a PC running the PowerNavigator 5. Connect USB to PMBus adapter board to J8 of ZL8800-2PH-DEMO1Z evaluation software in a Windows XP or Windows 7 operating systems. 6. Connect supplied USB cable from computer to USB to PMBus adapter board. Install the evaluation software from the following Intersil Install the PowerNavigator evaluation software from the website: following Intersil website: