Electronics > Beginners
How to determine if PLL 4046 is locked?
ZeroResistance:
I am trying a Class E amplier with a PLL 4046. I see certain a half sine wave across the resonant capacitor, but I have no idea if the PLL is working as intended, bascally I plan to make a small dielectric heater, and I want to keep the gate pulses in phase with the sine wave output, that is always switch on the mosfet at zero voltage / zero current even if the load capacitor varies.
I have attached my circuit and some oscilloscope waveforms.
Lee Leduc:
Application note for 4046. http://www.ti.com/lit/an/scha003b/scha003b.pdf
iMo:
Pin 1 High when locked??
ZeroResistance:
--- Quote from: Lee Leduc on August 11, 2018, 01:28:02 pm ---Application note for 4046. http://www.ti.com/lit/an/scha003b/scha003b.pdf
--- End quote ---
Thanks for the reference, additionally whats bugging me is the feedack that I derive from the tank capacitor then give it via current limiting resistor to the diodes (1N4148). I was expecting a square wave here between 0 to 15V but I get quite low level over there.
Lee Leduc:
Here's another TI appnote. See Figure 15. http://www.ti.com/lit/an/scha002a/scha002a.pdf
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