Hi Team,
my customer has issues with EMI performance and to early drop out of the device. Now he wants either improve the design or needs a better suggestion for a other Buck-converter:
Unfortunately, the results of the TPS54541 for 24V do not meet expectations.
1. EMC could not be sufficiently pressed.
2. at low input voltages the drop out is too early and large.
I will look here again for a better controller by myself and hope you can still give me a recommendation.
Requirements for the 24V supply:
- Output voltage: 24V
- Output current:
o Typically 1A
o short time peaks up to 3,5A (banknote reader or printer)
- Maximum input overvoltage 40.6V (limited by circuitry)
- Typical operating voltage: 20.6V - 33V
- The supply runs through a bridge rectifier and transformer, so under high load the voltage may have a 100Hz ripple that drops below the 24V supply. In this case, the controller should pass the input voltage with ripple without dropout if possible.
- To get more control and possibilities in terms of EMC suppression the Hi Side Mosfet should be adjustable in its slope. Either via an external gate resistor with external gates or other possibilities.
- The regulator can be an asynchronous type or synchronous type.
Thank You
Jan
