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ZSPM1501ZA1W0 Datasheet(PDF) 39 Page - Integrated Device Technology |
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ZSPM1501ZA1W0 Datasheet(HTML) 39 Page - Integrated Device Technology |
39 / 101 page ZSPM15xx Datasheet © 2016 Integrated Device Technology, Inc. 39 January 27, 2016 For design guidance using one of the preselected power stages, refer to section 4.2. Otherwise, the following procedure is recommended: 1.) Set R7’ = 1k Ω 2.) Calculate C8’ = L / (DCR * R7’). 3.) Select capacitor C8 = C9 from the appropriate E-series close to C8. 4.) Recalculate R6 = R7 = L / (DCR * C8) based on the capacitor selected for C8. 4.5. Input Voltage Sensing The ZSPM15xx supports input voltage sensing for input voltage protection. Therefore a voltage divider between the input voltage and the VIN pin is required. An optional capacitor C10 can be connected to the VIN pin to help improve noise immunity. See Table 4.1 for the recommended values for R8, R9, and C10. Figure 4.4 Input Voltage Sense Circuitry 4.6. External Temperature Sensing The ZSPM15xx features external temperature sensing via a PN-junction. Typically, a small signal transistor, such as the 3904, is used for this purpose. The sense elements should be placed thermally close to the inductor to allow accurate temperature measurement. For information about the required device parameters, refer to the electrical specification in section 1.3. An additional capacitor (C11, 100nF) can be used to improve noise performance. Figure 4.5 External Temperature Sense Circuitry VIN Vin R9 C10, R8 ZSPM15xx TEMP D1 ZSPM15xx C11 |
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