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ZSPM1501ZA1W0 Datasheet(PDF) 39 Page - Integrated Device Technology

Part # ZSPM1501ZA1W0
Description  True-Digital PWM Controller
Download  101 Pages
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Manufacturer  IDT [Integrated Device Technology]
Direct Link  http://www.idt.com
Logo IDT - Integrated Device Technology

ZSPM1501ZA1W0 Datasheet(HTML) 39 Page - Integrated Device Technology

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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
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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