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7440650022 データシート(PDF) 11 Page - Texas Instruments |
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7440650022 データシート(HTML) 11 Page - Texas Instruments |
11 / 40 page VOUT RESET High = Power Good Low = Fault 94% 93% 107% 106% 11 LM53602, LM53603 www.ti.com SNVSAR0 – NOVEMBER 2016 Product Folder Links: LM53602 LM53603 Submit Documentation Feedback Copyright © 2016, Texas Instruments Incorporated 8.3 Feature Description 8.3.1 RESET Flag Output The RESET function, built-in to the LM53603, has special features not found in the ordinary Power Good function. A glitch filter prevents false flag operation for short excursions in the output voltage, such as during line and load transients. Furthermore, there is a delay between the point at which the output voltage is within specified limits and the flag asserts Power Good. Because the RESET comparator and the regulation loop share the same reference, the thresholds track with the output voltage. This allows the LM53603 to be specified with a 96.5% maximum threshold, while at the same time specifying a 95% threshold with respect to the actual output voltage for that device. This allows tighter tolerance than is possible with an external supervisor device. The net result is a more accurate power-good function while expanding the system allowance for transients, and so forth. RESET operation can best be understood by reference to Figure 7 and Figure 8. The values for the various filter and delay times can be found in the Timing Requirements table. Output voltage excursions lasting less than TRESET-filter, do not trip RESET. Once the output voltage is within the prescribed limits, a delay of TRESET-act is imposed before RESET goes high. This output consists of an open-drain NMOS; requiring an external pullup resistor to a suitable logic supply. It can also be pulled up to either VCC or VOUT, through an appropriate resistor, as desired. If this function is not needed, the pin should be left floating or grounded. When EN is pulled low, the flag output is also forced low. With EN low, RESET remains valid as long as the input voltage is ≥ 1.5 V. The maximum current into this pin should be limited to 1 mA, while the maximum voltage should be less than 8 V. Figure 7. Static RESET Operation |
同様の部品番号 - 7440650022 |
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同様の説明 - 7440650022 |
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