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ZSPM1035A Fiches technique(PDF) 18 Page - Integrated Device Technology

No de pièce ZSPM1035A
Description  True Digital PWM Controller
Download  45 Pages
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Fabricant  IDT [Integrated Device Technology]
Site Internet  http://www.idt.com
Logo IDT - Integrated Device Technology

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ZSPM1035A Datasheet
© 2016 Integrated Device Technology, Inc.
18
January 27, 2016
3.3.6.
Current Sensing
The ZSPM1035A 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 on the OKLP-X/25-W12-C power block 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 ZSPM1035A 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.
Additionally, in order to improve the accuracy of the current measurement, which can be adversely affected by the
temperature coefficient of the inductor’s DCR, the ZSPM1035A features temperature compensation via external
temperature sensing. The temperature of the inductors is measured with an external temperature-sensing
element placed close to the inductor. This information is used to adapt the gain of the current sense path to
compensate for the increase in actual DCR.
ZSPM1035
+Vout
2.15 kOhm
R6
2.15 kOhm
ISNSP
ISNSN
C8
220nF
L
DCR
Murata
OKLP-X/35-W12-C
+CS
-CS


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