National Semiconductor Application Note 2054 Mark Hartman June 17, 2010 LM10000 Overview It is configured to operate with the following conditions: The LM10000 is used to enable Adaptive Voltage Scaling (AVS) to non-AVS regulators. It includes a complete Slave Power Controller (SPC 2.0) to communicate to the PowerWise Interface® (PWI 2.0), and a programmable current output DAC that allows voltage control to any regulator utilizing a feedback node/resistors to set the output voltage. In addition to enabling AVS the LM10000 allows the system to control power states such as sleep and shutdown and to configure the voltage step slew rate from the PWI. Parameter Default Voltage VDD 3.0 - 5.5 VAVS* Programming Range Current (mA) 0.6 - 1.2V 7-bit * VAVS range assumes the slave regulator has a 0.6V feedback voltage, and 10 kΩ feedback resistors. Evaluation Board Overview The LM10000 evaluation board provides all the circuitry needed to conveniently demonstrate PowerWise® AVS on nonAVS regulators. Evaluation Board for LM10000 - PowerWise® AVS System Controller Evaluation Board for LM10000 - PowerWise® AVS System Controller 30122904 FIGURE 1. LM10000 Evaluation Board AN-2054 © 2010 National Semiconductor Corporation 301229 www.national.com AN-2054 and a slave regulator with external feedback resistors. The slave regulator should be specified for the needs of the load (output power, input voltage range, etc.). LM10000 Evaluation Board Quick Start A typical set up using LM10000 requires an LM10000 evaluation board, a USB to PWI baseboard, a PC with USB port, Basic Setup (Open Loop Voltage Scaling) 30122905 FIGURE 2. Basic Setup 1. 2. 3. 4. 5. 6. 7. Install the LM10000 GUI on a PC in close proximity to the LM10000 set up. Insure that LM10000 eval board is connected to USB to PWI base board. Connect a wire from IAVS to the center of the feedback resistor divider on the slave regulator board. Connect a wire from the LM10000 evaluation board ground to the slave regulator board ground. Connect a USB cable from a PC to the LM10000 Evaluation board*. Apply power to the input of the slave regulator. Use the GUI to program IAVS and observe slave regulator voltage scaling on a scope or DMM. * The LM10000 evaluation board can be powered by the USB to PWI baseboard or externally. See Table 1. Once power is applied, the LM10000 enable and logic input pins are pulled up by on-board pull-up resistors , except the FLT_N and CONTROL pin. If the GUI is used, please press the two buttons for FLT_N and CONTROL down (set to 1) and the device is active. If the 20-pin connector is used, please make sure these two pins are high (push-pull connection on the board). www.national.com 2 AN-2054 Advanced (Enable Power Management and Voltage Scaling) 30122914 FIGURE 3. Advanced Setup 1. 2. 3. 4. 5. 6. 7. 8. Install the LM10000 GUI on a PC in close proximity to the LM10000 set up. Insure that LM10000 eval board is connected to USB to PWI base board. Connect a wire from IAVS to the center of the feedback resistor divider on the slave regulator board. Connect a wire from CNTL_EN to the enable input of the slave regulator (requires the slave regulator to have a logic enable input). Connect a wire from the LM10000 evaluation board ground to the slave regulator board ground. Connect a USB cable from a PC to the LM10000 Evaluation board.* Apply power to the input of the slave regulator. Use the GUI to program IAVS and power states (active, sleep, shutdown); observe slave regulator voltage on a scope or DMM. * The LM10000 evaluation board can be powered by the USB to PWI baseboard or externally. See Table 1. Once power is applied, the LM10000 enable and logic input pins are pulled up by on-board pull-up resistors except the FLT_N and CONTROL. If the GUI is used, please press the two buttons for FLT_N and CONTROL down (set to 1) and the device is active. If the 20-pin connector is used, please make sure these two pins are high (push-pull connection on the board). 3 www.national.com AN-2054 sired to understand how much power savings can be achieved by lowering the voltage of an ASIC or FPGA. With a couple connections from the LM10000 evaluation board to the system board, power savings analysis can be done without disrupting the power layout of the system board. In Situ PowerWise® AVS Evaluation Using LM10000 Evaluation Board The LM10000 evaluation board can be used to facilitate AVS evaluation of a non-AVS application. In many cases, it is de- 30122915 FIGURE 4. In Situ PowerWise® AVS Setup (Closed Loop Voltage Scaling) TABLE 1. Jumper Settings Jumper Connection Description P1 VPWI external input P2 VDD external input P3 20-pin header to connect all necessary signals to application board for closed-loop AVS evalution P4 VDD to VBAT VDD to VDD_EXT P5 P6 VDD powered externally IAVS_MIR measurement VPWI to VBAT VPWI to VPWI_EXT www.national.com VDD powered by USB to PWI baseboard (3.6V) VPWI powered by USB to PWI baseboard VPWI powered externally 4 FIGURE 5. LM1000 AVS System Controller Schematic 30122907 AN-2054 5 www.national.com AN-2054 TABLE 2. Bill of Materials Designator Comp. Type Value Package Reference Description Manufacturer Part Number C1 Capacitor 0.1uF 0603 Ceramic, Y5V, 16V, 80% TDK C1608Y5V1C104Z C2 Capacitor 1uF 0603 Ceramic, X5R, 6.3V, 10% TDK C1608X5R0J105K C3 Capacitor 0.1uF 0603 Ceramic, X7R, 16V, 10% TDK C1608X7R1C104K R1 Resistor 1.50k 0805 1%, 0.125W Vishay-Dale CRCW08051K50FK EA R2 Resistor 1.50k 0603 1%, 0.1W Vishay-Dale CRCW06031K50FK EA R3, R4, R5, R6 Resistor 1.00k 0603 1%, 0.1W Vishay-Dale CRCW06031K00FK EA R7, R9, R12, R13 Resistor 10.0k 0603 1%, 0.1W Vishay-Dale CRCW060310K0FK EA R8 Resistor 27 0603 5%, 0.1W Vishay-Dale CRCW060327R0JN EA R10 Resistor 40.2k 0805 1%, 0.125W Vishay-Dale CRCW080540K2FK EA R11 Resistor 1.00 0603 1%, 0.1W Vishay-Dale CRCW06031R00FN EA R14 Resistor 54.9k 0805 1%, 0.125W Vishay-Dale CRCW080554K9FK EA U1 IC National Semiconductor Corporation LM10000SDE NOPB www.national.com LLP 14 6 AN-2054 Layout Artwork 30122901 FIGURE 6. Evaluation Board (Top View) 30122909 FIGURE 7. Top Layer 7 www.national.com AN-2054 30122910 FIGURE 8. Mid-Layer 1 30122911 FIGURE 9. Mid-Layer 2 www.national.com 8 AN-2054 30122912 FIGURE 10. Bottom Layer 30122902 FIGURE 11. Top Silk Screen 9 www.national.com AN-2054 30122913 FIGURE 12. 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