Hello,
See image below for reference to the schematic:
I am utilizing this PWM to interface between a 15V power supply and a 12V 50aH battery to power a 12V load. I have copied the schematic shown above with the addition of adding a 12V Voltage Regulator in series with the output to step down the 15V supply.
Once I pieced the board together, I connected a 15V power supply to the Vin line and was able to measure a 12V output voltage after my Vregulator. I tested this with a load and found that I was getting the appropriate current/voltage from my PCB. Please note that I did not have any voltage present on the "Battery line" as found at the bottom of the schematic during this time.
Next, I tested the Battery line by connecting my power supply there at 12.6V to simulate battery conditions and found that my output pad worked properly and as expected. During this time, there was no voltage source attached to the Vin line.
I then wanted to ensure that my power supply could charge the battery line in addition to a load being connected to the output line. However, when I put a 15V power supply in the input line, I found that I am getting no voltage at all in any net/trace that goes to my battery terminal. I do receive the 12V regulated output as expected, however, there is no power going to pins 11, 14, 15, and 18 on the LTC4012 chip.
I have read over the datasheet and from what I understand, the BAT pin (11) should provide power that ranges from Vin to GND. Am I misunderstanding the functionality of this charger?
Any assistance would be sincerely appreciated.
Best,
TD147
I have created the following schematic and have found that I am reading no power at my battery terminal.
