I had some application about ALM2402-Q1, how to set the Opa gain and voltage that we can got the full bridge driver result.
Hi Xuekjun,
how to set the Opa gain and voltage that we can got the full bridge driver result.
We have ALM2402-Q1, ALM2402F-Q1, ALM2403-Q1 dual power amplifier or resolver drivers. I think that ALM2402F-Q1 may be more suited for the application. If this is for lower frequency full bridge driver, ALM2402-Q1 may work, except it has the slew rate of 0.17V/usec, which its full power bandwidth may be limited for certain application.
If you are able to provide the design requirements, we can select one on your behalf.
Regarding to op amp gain settings, you may treat individually or Gain up in one stage (say upper stage) and use buffer to drive the lower stage. In the example above, Vexc- is fed from upper stage to lower stage, which it will provide 180 degree inversion. The driving load is floating as shown in the image above.
If the op amps are operating in single supply voltage rail, you need to watch for the required bias voltage and make sure that the op amp is operating in a linear region.
ALM2402F-Q1 Float Load 10242022.TSC
If you have additional questions, please let us know.
Best,
Raymond
Raymond, thanks for your answer.
But now our input didn't provide both side voltage, and our origin design as attached picture.
I want know ALM2402 can replace this function, thanks!
Hi Xuejun,
ALM2402F-Q1 should be able to drive the Hall Current sensor without issues. Since you do not have LCR figures, I can only estimate what it may be like.
ALM2402F-Q1 Hall Sensor 10252022.TSC
Below is the ALM2402F-Q1's output capability at room and elevated operating temperature. ALM2402F-Q1 is capable to source/sink up to 300mA over a wide temperature range (Tamb > 85C or greater), so the driving application should be adequate. It will be much compact design than the BJT or MOSFET complementary current boost design.
Whenever driving a reactive load, a designer may need to consider real power, reactive power and apparent power. This may lower the power dissipation in ALM2402F-Q1 IC. I will need the actual load parameters in order to simulate and compare these operating current figures. In terms of power amplifier's loop stability, I will also need the actual load parameters (you need to provide us the datasheet or the actual LCR measurement and operating frequency range).
Regarding to other automotive input and overvoltage protection, please see the attached application note.
If you have additional questions, please let us know.
Best,
Raymond
Hi Xuejun,
Since you only provided the partial load requirements, I put together the simulation with operating frequency at 100Hz. ALM2402F-Q1 should be able to source and sink 250mA of current up to Tamb 85C for a typical automotive application. Please see the enclosed Tina simulation.
2046.ALM2402F-Q1 Hall Isensor 10262022.TSC
I need to the actual load in order to check the ALM2402F-Q1's heat dissipation. The max. average AC Power dissipation in ALM2402F-Q1 may be calculated or simulated via the equation below.
If you have additional questions, please let me know.
Best,
Raymond
