AND9797/D Reduced Power Dissipation of Relay Loads APPLICATION NOTE
●Integrated circuit driver circuits often use relay loads in their application. Output drivers are a source of power dissipation on the IC. Latching relays can be used to keep sustaining load current at a minimum by engaging and removing drive current, but a PWM system can also preserve reduced power conditions by engaging and reducing duty cycle using standard type relays.
●By considering the Maximum Turn−On Voltage and Minimum Turn−Off Voltage specifications typically quoted in the relay electrical specification, your system design can utilize a signal to pull−in and activate the relay followed by a reduced power PWM sustaining signal.
●The only inconvenience here is doing your calculations for the two states (pull−in current and drop−out current) and adding an external clamping diode to account for the additional clamping action of the system.
●Table 1 below highlights a recent view of current electrical specifications of automotive relays for Maximum Turn−On Voltage, Minimum Turn−Off Voltage and Coil Current. These are all the attributes we need to for mulateusage of standard relays in a PWM mode for reduced power conditions.
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Application note & Design Guide |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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December, 2018 |
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Rev. 0 |
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AND9797/D |
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761 KB |
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