Datenblatt-Suchmaschine für elektronische Bauteile |
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ZSPM1025A Datenblatt(PDF) 18 Page - Integrated Device Technology |
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ZSPM1025A Datenblatt(HTML) 18 Page - Integrated Device Technology |
18 / 45 page ZSPM1025A Datasheet © 2016 Integrated Device Technology, Inc. 18 January 25, 2016 3.3.6. Current Sensing The ZSPM1025A offers cycle-by-cycle average current sensing with configurable over-current protection. A dedicated ADC is used to provide fast and accurate current information over the switching period. The acquired information is compared with configurable current thresholds to report warning and error levels to the user. DCR current sensing across the inductor and dedicated shunt resistors is supported. Additionally, the device uses DCR temperature compensation via the external temperature-sensing element. This increases the accuracy of the current sense method by counteracting the significant change of the DCR over temperature. To acquire accurate current information, the selection of the current-sensing circuit is of critical importance. The schematic of the required current-sensing circuitry is shown in Figure 3.4 for the widely used DCR current-sensing method, which uses the parasitic resistance of the inductor to acquire the current information. The principle is based on a matched time-constant between the inductor and the low-pass filter built from a 2.15k Ω resistor mounted on the Murata Power Block and C8. Resistor R6 should be a precision 2.15k Ω resistor in order to provide good DC voltage rejection, .i.e. reduce the influence of the output voltage level in the current measure- ment. Figure 3.4 Inductor Current Sensing Using the DCR Method End-of-line calibration is supported so that the ZSPM1025A can achieve improved accuracy over the full output current range. The full calibration method is detailed in the ZSPM10xx Application Note—Programming and Calibration. This allows the user to correct mismatches between the nominal DCR value used to configure the device and the actual DCR value in the application caused by effects such as manufacturing variations. The calibration range is limited to +/- 50% of the nominal DCR value. ZSPM1025 +Vout 2.15 kOhm R6 2.15 kOhm ISNSP ISNSN C8 220nF L DCR Murata OKLP-X/25-W12-C +CS -CS |
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