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LM10000 データシート(PDF) 10 Page - Texas Instruments |
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LM10000 データシート(HTML) 10 Page - Texas Instruments |
10 / 22 page Slave Regulator FB VOUT LM10000 RFB1 RFB2 + - VOUT VFB + - + - IRFB2 IAVS IRFB1 VRFB1 + - IAVS PWI LM10000 IAVS LM10000 SNVS643C – JUNE 2010 – REVISED APRIL 2013 www.ti.com OPERATION DESCRIPTION GENERAL DESCRIPTION The LM10000 provides all the circuitry needed to enable most DC/DC regulators to work in a PowerWise® Adaptive Voltage Scaling (AVS) system. It communicates via the PowerWise Interface (PWI), and has analog outputs to control the output voltage of a slave power regulator. The slave power regulator can be any device that sets its output voltage with a feedback resistor divider. THEORY OF OPERATION The LM10000 can be thought of as a D/A converter, converting PWI communication to analog outputs. One of the outputs is a current DAC (IAVS), which is connected to the feedback node of a slave regulator. Therefore, all PWI Change Voltage Commands (CVC) are decoded into a 7-bit current DAC output. The impedance of the feedback node at DC appears as the top feedback resistor. This is because the control loop of the slave regulator effectively maintains a constant current/voltage across the bottom feedback resistor, and creates low impedance at the VOUT node. Therefore, as more current is sourced into the feedback node, the more the output voltage is reduced. See Figure 6. Figure 6. Output Voltage Is Controlled Via current Injection Into Feedback Node DIGITAL POWER MANAGEMENT In addition to adaptive voltage scaling, the PWI and LM10000 enhance the slave regulator with basic digital power management control. This includes control of power states such as SHUTDOWN, SLEEP, and ACTIVE, ON/OFF sequencing, and voltage scaling slew rate. Figure 7 shows the LM10000 with available system connectivity options. The LM10000 has a flexible set of logic enable pins to allow the system easy interface to power states and sequencing. A logic CNTL_EN output is provided to drive the slave regulator enable according the power state of the LM10000. For example, if a PWI SHUTDOWN command is issued to LM10000, the CNTL_EN output is immediately driven to 0V, which if connected to the slave regulator enable input, will turn off the output voltage and enter a low Iq state. A summary of the logic inputs and outputs is given is LOGIC INPUTS AND OUTPUTS table. 10 Submit Documentation Feedback Copyright © 2010–2013, Texas Instruments Incorporated Product Folder Links: LM10000 |
同様の部品番号 - LM10000 |
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同様の説明 - LM10000 |
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