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LM10011 bảng dữ liệu(PDF) 10 Page - Texas Instruments |
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LM10011 bảng dữ liệu(HTML) 10 Page - Texas Instruments |
10 / 21 page Slave Regulator FB VOUT LM10011 RFB1 RFB2 +- VOUT VFB + - + - IRFB2 IDAC_OUT IRFB1 VRFB1 + - IDAC_OUT VID LM10011 LM10011 SNVS822 – DECEMBER 2012 www.ti.com FUNCTIONAL DESCRIPTION GENERAL The LM10011 is a precision current DAC used for controlling any point of load regulator with an adjustable resistor feedback network. Four VID communication lines (VIDA,B,C,S) are used to write a 6-bit or 4-bit VID value. The output of the IDAC (IDAC_OUT) is used to inject a precision current into the feedback node of a regulator, thus adjusting the output voltage. With this method, it is possible to precisely control the output voltage of the regulator. An enable pin (EN) is provided to allow for a reduced quiescent current when not in use. Also, the VDD line is monitored so that an under-voltage event will shut-down the LM10011 (IDAC_OUT = 0.0µA). The device is available in a 10-pad No-Pullback Package (SON-10). The LM10011 can be used in numerous applications with regulators from 2.97V to 5.5V supplies. A block diagram of the LM10011 is shown in Figure 2. THEORY OF OPERATION The LM10011 can be treated as a D/A converter, converting digital VID codes to analog outputs. The LM10011 DAC analog output is a current that flows out of the IDAC_OUT pin. The IDAC_OUT pin is intended to be connected to the feedback node of a voltage regulator as shown in Figure 3. In a typical voltage regulator, the current in RFB2 is constant by virtue of the regulator feedback loop maintaining the reference voltage at the feedback node. The current flowing through RFB2 is the same current flowing through RFB1. When current is injected into the feedback node by the LM10011, less current is required from the RFB1 resistor. The consequence of this is that the output voltage of the regulator will decrease to maintain the total amount of current in RFB2 in order to regulate at the correct feedback (reference) voltage. Each VID code corresponds to a different IDAC_OUT current and thus a different output voltage. Increasing the VID code lowers the IDAC_OUT current and raises the output voltage. Decreasing the VID code raises the IDAC_OUT current and lowers the output voltage. All VID codes are decoded into a 6-bit or 4-bit current DAC output whether the MODE equals 0 (connected to GND) or 1 (connected to VDD). Figure 3. Output Voltage (VOUT) is Controlled Via Current Injection into the Feedback Node CURRENT DAC The LM10011 current DAC is based on a low voltage bandgap reference setting a current through a precision adjustable resistor. This bandgap is trimmed for precision and gives excellent performance over temperature. The output current has a maximum full-scale range [VID = 000000b] of 59.2µA and is adjustable with a 6/4-bit VID word. This allows for 64/16 settings, with a resolution of 940nA / 3.76µA respectively. The current DAC also has a slew limit to prevent abrupt changes in the output. The slew limit is represented as a time constant, t6 = 40µs, in the Electrical Characteristics table. A deglitch filter for the VID inputs provides noise immunity and effectively adds a small delay from the transition of a VID line to the change in IDAC_OUT current. 10 Copyright © 2012, Texas Instruments Incorporated Product Folder Links: LM10011 |
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