Other Parts Discussed in Thread: TPS54240
Hello,
In order to transform 18-36 V to 12V I decided to use a buck converter controller. I specifically needed the power good output for my project.
I chose the TPS54260 and build it on a breadboard. I used a breakout board with heatpad for the chip. (
)
When I put a resistor of 300 ohm or higher on the output it works fine.
However, if I place a lower resistance of 200 ohm the output voltage drops and I can't see any switching occurring. I also noted that the chip will draw a higher current from the source and gets hot to touch.
Since I am not very experienced with these controllers I decided to test the 24V to 4.2V GSM power supply given in the datasheet. (figure 66)
The result is the same, although the faulty condition now occurs with an output resistance of less than 50 ohm. 80 ohm works fine.
This is all in the order of milli amps, nowhere near the expected maximum of 2A.
I need to note that I don't have the right capacitors for the compensation network yet so I tested with a 10pF from comp pin to ground.
My question is, can the absence of the right compensation network or the use of a breadboard explain these conditions?
