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May 24, 2017
03:29 AM
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May 24, 2017
03:29 AM
I AM USING IR 2110 TO TURN THE MOSFET IR 540 N USING HIGH SIDE CONFIGURATION MY MOSFET IS NOT TURNING ON TO CHARGE A BATTERY PLEASE HELP
VDD IS +5v ,VCC is 12+VOLT
I AM POSTING THE SCHEMATIC OF CIRCUIT I HAVE USED
VDD IS +5v ,VCC is 12+VOLT
I AM POSTING THE SCHEMATIC OF CIRCUIT I HAVE USED
Solved! Go to Solution.
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1 Solution
Jun 04, 2017
11:50 PM
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Jun 04, 2017
11:50 PM
Zuhaib,
As I already mentioned, "Only when you solved the charging issue for Cbs, then the circuit can work properly. " Actually there's no charging loop for Cbs as in your circuit.
Normally the charging loop is from Vcc --> bootstrap diode --> Cbs-->Vs--> low side mosfet--> COM; but in your application, Vcc=12V, Vs is connected to the battery, it is 14.5V, and low side Mosfet is OFF. So the charging loop doesn't work. So there's no enough voltage on Cbs, then HO will keep low, the circuit doesn't work as you expected.
For your application, I would suggest you to use our smart high side switch, for example, BTS441, here is the link for the datasheet:
https://www.infineon.com/dgdl/Infineon-BTS441TG-DS-v01_21-EN.pdf?fileId=5546d4625a888733015aa9afd699...
As I already mentioned, "Only when you solved the charging issue for Cbs, then the circuit can work properly. " Actually there's no charging loop for Cbs as in your circuit.
Normally the charging loop is from Vcc --> bootstrap diode --> Cbs-->Vs--> low side mosfet--> COM; but in your application, Vcc=12V, Vs is connected to the battery, it is 14.5V, and low side Mosfet is OFF. So the charging loop doesn't work. So there's no enough voltage on Cbs, then HO will keep low, the circuit doesn't work as you expected.
For your application, I would suggest you to use our smart high side switch, for example, BTS441, here is the link for the datasheet:
https://www.infineon.com/dgdl/Infineon-BTS441TG-DS-v01_21-EN.pdf?fileId=5546d4625a888733015aa9afd699...
11 Replies
May 25, 2017
01:51 AM
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May 25, 2017
01:51 AM
zuhaib,
Yes, this circuit can't work properly as you expected. As it is for charging the battery, so the Source of the Mosfet is connected to the battery, the voltage on this pin is 12V as shown on the pic.
And for the HO of the IR2110, the power supply is the voltage between Vb and Vs, but there's no connection for Vs, then how to charging the capacitor between Vb and Vs? -- This is the key in the application. Only when you solved the charging issue for Cbs, then the circuit can work properly.
Yes, this circuit can't work properly as you expected. As it is for charging the battery, so the Source of the Mosfet is connected to the battery, the voltage on this pin is 12V as shown on the pic.
And for the HO of the IR2110, the power supply is the voltage between Vb and Vs, but there's no connection for Vs, then how to charging the capacitor between Vb and Vs? -- This is the key in the application. Only when you solved the charging issue for Cbs, then the circuit can work properly.
May 26, 2017
05:06 PM
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May 26, 2017
05:06 PM
Hello Zuhaib,
It's a bit difficult to read the details in the photo snapshot that you provided, but we assume that the serial resistor is 10 Ohms. You used the additional diode to do the discharging faster, correct?
You can check your circuit against the typical one here http://www.infineon.com/dgdl/ir2110.pdf?fileId=5546d462533600a4015355c80333167e on page 1 .
-You don't have a cap at Vss and Vdd.
-The MOSFET needs to be connected with Pin 5. This line is missing in your circuit; therefore, the MOSFET has no potential.
-The cap at the MOSFET drain to ground is missing.
-Please consider that cable or connectors can have influences. Wires should be quite short.
Please check with an oscilloscope if the gate charge and the timing are ok.
Check here:
http://www.infineon.com/dgdl/an-1092.pdf?fileId=5546d462533600a401535595bc541044 and see chapter 2.1
For timing, see page 3 (Ton,toff,etc) and figure 4 see page 6. Ton/off is typical 120 & 94 ns.
As for details for the gate charge please see here:
http://www.infineon.com/dgdl/an-944.pdf?fileId=5546d462533600a40153559eb9841190
http://www.infineon.com/dgdl/an-937.pdf?fileId=5546d462533600a40153559ea1481181
Also, consider this idea: Here you can use a simulation to check your circuit, see here. Then you can compare the simulation against your osci-pic
s.
http://www.infineon.com/cms/en/product/power/gate-driver-ics/level-shift-gate-drivers/high-and-low-s...
Hope this helps!
It's a bit difficult to read the details in the photo snapshot that you provided, but we assume that the serial resistor is 10 Ohms. You used the additional diode to do the discharging faster, correct?
You can check your circuit against the typical one here http://www.infineon.com/dgdl/ir2110.pdf?fileId=5546d462533600a4015355c80333167e on page 1 .
-You don't have a cap at Vss and Vdd.
-The MOSFET needs to be connected with Pin 5. This line is missing in your circuit; therefore, the MOSFET has no potential.
-The cap at the MOSFET drain to ground is missing.
-Please consider that cable or connectors can have influences. Wires should be quite short.
Please check with an oscilloscope if the gate charge and the timing are ok.
Check here:
http://www.infineon.com/dgdl/an-1092.pdf?fileId=5546d462533600a401535595bc541044 and see chapter 2.1
For timing, see page 3 (Ton,toff,etc) and figure 4 see page 6. Ton/off is typical 120 & 94 ns.
As for details for the gate charge please see here:
http://www.infineon.com/dgdl/an-944.pdf?fileId=5546d462533600a40153559eb9841190
http://www.infineon.com/dgdl/an-937.pdf?fileId=5546d462533600a40153559ea1481181
Also, consider this idea: Here you can use a simulation to check your circuit, see here. Then you can compare the simulation against your osci-pic
s.
http://www.infineon.com/cms/en/product/power/gate-driver-ics/level-shift-gate-drivers/high-and-low-s...
Hope this helps!
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May 26, 2017
11:33 PM
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May 26, 2017
11:33 PM
sorry i forget to mention that but i have connected connected vs to the source already still not working help me with the bootstep circuitry with value of cap.
thank you for your reply indeed
thank you for your reply indeed
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May 26, 2017
11:34 PM
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May 26, 2017
11:34 PM
thanks for your reply i will tell you when i done what u have told me
thanks
thanks
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May 27, 2017
02:51 AM
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May 27, 2017
02:51 AM
still my circuit is not working please help with capacitors value
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May 27, 2017
02:52 AM
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May 27, 2017
02:52 AM
still my circuit is not working please help with capacitors value
May 28, 2017
11:50 PM
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May 28, 2017
11:50 PM
To find the right value of the bootstrap capacitor and for other hints I think this design tip document will help you.
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May 29, 2017
03:50 AM
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May 29, 2017
03:50 AM
does my circuit is correct.?
Jun 02, 2017
11:43 AM
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Jun 02, 2017
11:43 AM
Hello Zuhaib,
Please keep in mind that a high side driver requires the bootstrap capacitor to be charged in order to turn on the switch. This means that driver needs to be used in such a way that it is switching at higher frequencies (kHz) and should have a way to refresh the bootstrap capacitor each cycle.
Check to confirm whether or not the voltage across the bootstrap capacitor (VB to VS) > than the UVLO for the IR2110. This voltage should be in the vicinity of the ~VCC voltage. Also, as asked before, it is not clear what is the value of your bootstrap capacitor.
My recommendation to you is to take scope measurements of the signals and timings and compare these against the links that are mentioned in the thread within the reply above.
Please keep in mind that a high side driver requires the bootstrap capacitor to be charged in order to turn on the switch. This means that driver needs to be used in such a way that it is switching at higher frequencies (kHz) and should have a way to refresh the bootstrap capacitor each cycle.
Check to confirm whether or not the voltage across the bootstrap capacitor (VB to VS) > than the UVLO for the IR2110. This voltage should be in the vicinity of the ~VCC voltage. Also, as asked before, it is not clear what is the value of your bootstrap capacitor.
My recommendation to you is to take scope measurements of the signals and timings and compare these against the links that are mentioned in the thread within the reply above.
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Jun 02, 2017
11:59 PM
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Jun 02, 2017
11:59 PM
HELLO
ITS CLEARLY MENTIONED ON TOP OF MY CIRCUIT . 22UF (63 v) IS THE VALUE OF MY BOOTSTRAP CAPACITOR THAT IS BETWEEN VB AND VS..
I JUST WANT TO KNOW THAT MY VS IS CONNECTED TO SOURCE WHICH IN TURN IS CONNECTED WITHY THE POSITIVE TERMINAL OF BATTERY SO HOW WILL I CHARGE MY BOOTSTRAP CAPACITOR
THANKS IN ADVANCE
ITS CLEARLY MENTIONED ON TOP OF MY CIRCUIT . 22UF (63 v) IS THE VALUE OF MY BOOTSTRAP CAPACITOR THAT IS BETWEEN VB AND VS..
I JUST WANT TO KNOW THAT MY VS IS CONNECTED TO SOURCE WHICH IN TURN IS CONNECTED WITHY THE POSITIVE TERMINAL OF BATTERY SO HOW WILL I CHARGE MY BOOTSTRAP CAPACITOR
THANKS IN ADVANCE
Jun 04, 2017
11:50 PM
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Jun 04, 2017
11:50 PM
Zuhaib,
As I already mentioned, "Only when you solved the charging issue for Cbs, then the circuit can work properly. " Actually there's no charging loop for Cbs as in your circuit.
Normally the charging loop is from Vcc --> bootstrap diode --> Cbs-->Vs--> low side mosfet--> COM; but in your application, Vcc=12V, Vs is connected to the battery, it is 14.5V, and low side Mosfet is OFF. So the charging loop doesn't work. So there's no enough voltage on Cbs, then HO will keep low, the circuit doesn't work as you expected.
For your application, I would suggest you to use our smart high side switch, for example, BTS441, here is the link for the datasheet:
https://www.infineon.com/dgdl/Infineon-BTS441TG-DS-v01_21-EN.pdf?fileId=5546d4625a888733015aa9afd699...
As I already mentioned, "Only when you solved the charging issue for Cbs, then the circuit can work properly. " Actually there's no charging loop for Cbs as in your circuit.
Normally the charging loop is from Vcc --> bootstrap diode --> Cbs-->Vs--> low side mosfet--> COM; but in your application, Vcc=12V, Vs is connected to the battery, it is 14.5V, and low side Mosfet is OFF. So the charging loop doesn't work. So there's no enough voltage on Cbs, then HO will keep low, the circuit doesn't work as you expected.
For your application, I would suggest you to use our smart high side switch, for example, BTS441, here is the link for the datasheet:
https://www.infineon.com/dgdl/Infineon-BTS441TG-DS-v01_21-EN.pdf?fileId=5546d4625a888733015aa9afd699...