Data Sheet

Page 10 ams Datasheet

Document Feedback [v1-01] 2015-Oct-12

AS-MLV-P2 − Application I nfo rmation

To use the example a p-channel MOSFET is mandatory; using

an n-channel will need a change of the overall circuit design. In

this case the Voltage VCC is 5V with a max ripple of 20mV, but

the circuit is also valid for 3.3V. The circuit should be designed

to achieve a PWM of 30-60% depending on heater set-point.

This range gives the security that all specified environmental

temperature ranges can be compensated.

The heater resistance should be measured at the beginning of

the low phase indicated as T

in the drawing Figure 11. The

Voltage drop UH is measured and Rh can be calculated as shown

in EQ 2.

Please note that this circuit are just mend to be an example and

each circuit which can fulfill the conditions and respects the

absolute maximum ratings of the sensor can be used.

Figure 11:

Example of PWM Cycle with Measurement Point

The heater can also be controlled by a DAC controlled circuit

with a voltage divider.

(EQ2)

⋅

VCC U

–

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