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LM10010 データシート(PDF) 11 Page - Texas Instruments |
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LM10010 データシート(HTML) 11 Page - Texas Instruments |
11 / 17 page LM10010 www.ti.com SNVS717C – JULY 2011 – REVISED MARCH 2013 The change in the output voltage can be analyzed based on the resolution of the current DAC from the LM10010 compared to the desired resolution of the output swing of the regulator. RFB1 is designed to provide the desired LSB for VOUT with the equation: (2) Based on the desired default VOUT (with IDAC_OUT = 0 µA), RFB2 can be solved from Eq. 1 above. Example Solution Assuming a 400 mV output range, 64 VID codes, and an IDAC LSB of 0.940 µA, it is desired to have a VOUT with an LSB of 6.4 mV and a default value of 1.1V using an LM21215A-1 regulator: (3) (4) (5) (6) Using 1% resistor values, RFB1 can be set to 6.81 kΩ and RFB2 can be set to 8.06 kΩ. This will yield a regulator output range of 0.704V to 1.107V. At startup, the code of the LM10010 will be 46d (101110b) and will output a 15.97 µA. This will give an output voltage of approximately 1.0V (0.998V) when power is applied and both the LM10010 and the LM21215A-1 come out of UVLO. Of course, values calculated here will be dependent on the accuracy of the regulator, the LM10010 IDAC, and the resistor values used in the circuit. Table 1 shows the codes and some of the resultant values of the IDAC current and the corresponding regulator output voltage for the previous example. Table 1. VID Codes with IDAC Current and Regulator Voltage for the Example VID Code IDAC Current (µA) Regulator Voltage (V) 000000b 59.20 0.7038 000001b 58.26 0.7102 000010b 57.32 0.7166 000011b 56.38 0.7230 ... 111100b 2.82 1.0878 111101b 1.88 1.0941 111110b 0.94 1.1005 111111b 0.00 1.1069 PC Board Guidelines The following guidelines should be followed when designing the PC board for the LM10010: • Place the LM10010 close to the regulator feedback pin to minimize the FB trace length. • Place a small capacitor, CVDD, (1 nF) directly adjacent to the VDD and GND pins of the LM10010 to help minimize transients which may occur on the input supply line. • The high current path from the board’s input to the load and the return path should be parallel and close to each other to minimize loop inductance. • The ground connections for the various components around the LM10010 should be connected directly to each other, and to the LM10010’s GND pins, and then connected to the system ground at one point. Do not connect the various component grounds to each other through the high current ground line. • For additional information about the operation of the regulator, please consult the respective datasheet and application notes on the respective evaluation boards. Copyright © 2011–2013, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: LM10010 |
同様の部品番号 - LM10010_15 |
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同様の説明 - LM10010_15 |
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