Smart Power Switches Forum Discussions
I've a question regarding to use of isolated driver with BTS50085-1TMA. The datasheet says that there are two grounds in smart MOS application, namely "Logic GND" and "Load GND".
1) How would my circuit be affected if logic and load gnds are shorted via a "net tie" or "0 ohm" ? Does it affect the current sense accuracy?
2) Does BTS50085-1TMA isolate load and logic side with an internal isolator?
Healthy days, Show Less
I will be operating the device 30 volt max with an inductive clamped output at -25 volts (two diodes). Is this within the ratings?
I'm experimenting with the BTS50010-1TAD high side smart switch. However I'm experiencing very scattered values on the current feedback pin. I have connectedb the BTS to a ESP32 MCU.
I also don't understand how the dkILIS vs Rsense is calculated, because the values that is being read is not what I expected. With a 10K Rsense I was expecting 18500 µV per Amp = 18,5 mV per Amp = 0,05 Amp per mV. But what I get is notthis, and with a very inconsistent ratio between Vsense and the actual current measured thru the MOSFET.
Also the Vsense value can easily rise above any commonly available ADC Vmax value, usually 3V3 or 5V. But there is no zener or any other protection circuit recommended in the datasheet for the BTS50010-1TAD. What is the idea here?
This is my circuit:
Results from Vsense measured at IS versus actual mA flowing:
Thank you in advance.Show Less
I'm actually using a BTF50060-1TEA in my application, it work's well and I'm happy enough.
But I would like to modify my application making possible to parallelize outputs of BTF in order to manages an higher current.
I know the fact that switches are never really equal and, at the end, the two (or more) channels are different and especially in the OFF-state one of the group will be faster than the other. This one will has to regulate di energy itself.
So what I could do in order to avoid or, at least, limitate this dangerous situation ? External freewheeling diode ? Other advices ?
Alberto Show Less
in my gas cooking electronic project we first used AUIPS7221 for gas solenoid valves, but we had systematic breakage problems with the sparks caused to ignite the gas. a lot of testing was done and we decided to use the BTS4175SGA instead.
the component is powered at 48V stable and has esd protection.
The problem was ruptures caused by overvoltages induced by sparks caused externally by ignition of kitchen gas.
we have thought, however, to protect both the inputs and the power supply during this process with beads and capacitors as well as with capacitors since the pulses are of the order of 200nsec and with tvs.
do you think this solves the problem?
Andrea Penna Show Less
I have a circuit with a AUIPS7221R High frequency Protected High Side Switch used to drive a solenoid with PWM control.
I selected this switch as it was indicated to allow high frequency PWM so I can drive the solenoid with 15kHz to avoid the audible frequencies.
The solenoid is 5.32 ohm and is driven from a 24V SMPS with 100ms at 60% PWM and then while idle at 20% PWM.
There is a snubber diode across the solenoid.
Other than that, the setup is exactly as per the datasheet circuit and there is a fair amount of copper around the device on the PCB (top and bottom).
The problem I am having is that after a few uses of operating the solenoid a couple of times the switch goes somewhat short circuit in that when the 24V power is switched on and the gate drive is still off, the switch already connects power to the solenoid and the solenoid attracts (with sometimes disastrous and smoking results)
I now already have a stack of 7 blown up PCB's on my desk and I have no idea as to what is going on.
What can cause this 'intelligent' and 'protected' switch get damaged so easily or what could I be doing wrong? Show Less
The oscilloscope picture 1, yellow line is CS, pink line is MOSI, light blue line is CLK, the always high line is MISO.
Can any one provide demo code, right timing diagram, or application note about TLE9104SH?
The datasheet is too simple to solve or analyze the problem.
Thanks a lot. Show Less
I am trying to use the BTS71220-4ESA to drive 4 loads and read current sense feedback using IS however I am unable to use multiplex functionality properly.
My project requires me to switch between 4 loads and measure their current however when I monitor the current output from IS pin, it seems to be indepenent of my DCR.MUX register setting.
For example, it still shows me load for Out 0 when I select Out 1 using my mux setting.
Swapnil Show Less
Is it normal for the IN pin on BTS6143D to output the source voltage? Power supply: 12V. With no other pins connected, the IN pin outputs 12V. The IN pin is supposed to be shorted to GND in order to activate the OUTPUT pins. What am I missing here?
Miloš Show Less