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I have a MAX809 with RESET pin connected to the gate of IRLML6344. I will rephrase my question. At 5 V, RESET is also 5 V and the LED lights up. But if I add the fan, RESET drops to 0 V and draws 1...
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IC
#7: Post edited
by
timelyfiasco
·
2020-09-09T05:30:12Z (about 4 years ago)
Circuit Stops Working Depending on Load
- MAX809's Irregularity Depending on Load
I have a [MAX809](https://datasheets.maximintegrated.com/en/ds/MAX803-MAX810Z.pdf) with rst pin connected to the gate of [IRLML6344](https://www.infineon.com/dgdl/irlml6344pbf.pdf?fileId=5546d462533600a4015356689c44262c).- I will rephrase my question.
At 4V, RST is also 4V and the LED lights up. But if I add the fan, RST drops to 0V. Adding a 0.1uF cap solved this problem. What is happening here?So I added the MOSFET to the circuit but RST drops to 0V again when I connect a load. I have isolated the problem to the MAX809. I am thinking of using TP431 to replace MAX809. But is this a normal behavior?- For context, this is what I planned to do.
- I have a [MAX809](https://datasheets.maximintegrated.com/en/ds/MAX803-MAX810Z.pdf) with RESET pin connected to the gate of [IRLML6344](https://www.infineon.com/dgdl/irlml6344pbf.pdf?fileId=5546d462533600a4015356689c44262c).
- I will rephrase my question.
- At 5 V, RESET is also 5 V and the LED lights up. But if I add the fan, RESET drops to 0 V and draws 140 mA. Adding a 100 nF cap solved this problem. What is happening here?
- 
- Then I added a MOSFET to the circuit but depending on what is connected to LOAD2, RESET triggers at different values. I tried with 0.1 µF, 1 µF, and 10 µF. But RST triggers outside the specs. (specs is RESET off at 2.80 V and RESET is on at 2.93 V)
- Using 100 µF at C2,
- RESET is low at 2.80 V and high at 2.93 V when load is only an LED.
- RESET is low at 2.86 V and high at 2.93 V when load are LED and a DC fan with 150 mA current draw.
- RESET is low at 2.9 V and high at 3.2 V when I added a buck converter (LM2596) with nothing connected to it.
- 
- For context, this is what I planned to do.
- 
#6: Post edited
by
timelyfiasco
·
2020-09-09T05:29:49Z (about 4 years ago)
Circuit Stops Working Depending on Load
- MAX809's Irregularity Depending on Load
I have a [MAX809](https://datasheets.maximintegrated.com/en/ds/MAX803-MAX810Z.pdf) with rst pin connected to the gate of [IRLML6344](https://www.infineon.com/dgdl/irlml6344pbf.pdf?fileId=5546d462533600a4015356689c44262c).- I will rephrase my question.
At 4V, RST is also 4V and the LED lights up. But if I add the fan, RST drops to 0V. Adding a 0.1uF cap solved this problem. What is happening here?So I added the MOSFET to the circuit but RST drops to 0V again when I connect a load. I have isolated the problem to the MAX809. I am thinking of using TP431 to replace MAX809. But is this a normal behavior?- For context, this is what I planned to do.
- I have a [MAX809](https://datasheets.maximintegrated.com/en/ds/MAX803-MAX810Z.pdf) with RESET pin connected to the gate of [IRLML6344](https://www.infineon.com/dgdl/irlml6344pbf.pdf?fileId=5546d462533600a4015356689c44262c).
- I will rephrase my question.
- At 5 V, RESET is also 5 V and the LED lights up. But if I add the fan, RESET drops to 0 V and draws 140 mA. Adding a 100 nF cap solved this problem. What is happening here?
- 
- Then I added a MOSFET to the circuit but depending on what is connected to LOAD2, RESET triggers at different values. I tried with 0.1 µF, 1 µF, and 10 µF. But RST triggers outside the specs. (specs is RESET off at 2.80 V and RESET is on at 2.93 V)
- Using 100 µF at C2,
- RESET is low at 2.80 V and high at 2.93 V when load is only an LED.
- RESET is low at 2.86 V and high at 2.93 V when load are LED and a DC fan with 150 mA current draw.
- RESET is low at 2.9 V and high at 3.2 V when I added a buck converter (LM2596) with nothing connected to it.
- 
- For context, this is what I planned to do.
- 
#5: Post edited
by
timelyfiasco
·
2020-09-09T05:29:28Z (about 4 years ago)
Circuit Stops Working Depending on Load
- MAX809's Irregularity Depending on Load
I have a [MAX809](https://datasheets.maximintegrated.com/en/ds/MAX803-MAX810Z.pdf) with rst pin connected to the gate of [IRLML6344](https://www.infineon.com/dgdl/irlml6344pbf.pdf?fileId=5546d462533600a4015356689c44262c).- I will rephrase my question.
At 4V, RST is also 4V and the LED lights up. But if I add the fan, RST drops to 0V. Adding a 0.1uF cap solved this problem. What is happening here?So I added the MOSFET to the circuit but RST drops to 0V again when I connect a load. I have isolated the problem to the MAX809. I am thinking of using TP431 to replace MAX809. But is this a normal behavior?- For context, this is what I planned to do.
- I have a [MAX809](https://datasheets.maximintegrated.com/en/ds/MAX803-MAX810Z.pdf) with RESET pin connected to the gate of [IRLML6344](https://www.infineon.com/dgdl/irlml6344pbf.pdf?fileId=5546d462533600a4015356689c44262c).
- I will rephrase my question.
- At 5 V, RESET is also 5 V and the LED lights up. But if I add the fan, RESET drops to 0 V and draws 140 mA. Adding a 100 nF cap solved this problem. What is happening here?
- 
- Then I added a MOSFET to the circuit but depending on what is connected to LOAD2, RESET triggers at different values. I tried with 0.1 µF, 1 µF, and 10 µF. But RST triggers outside the specs. (specs is RESET off at 2.80 V and RESET is on at 2.93 V)
- Using 100 µF at C2,
- RESET is low at 2.80 V and high at 2.93 V when load is only an LED.
- RESET is low at 2.86 V and high at 2.93 V when load are LED and a DC fan with 150 mA current draw.
- RESET is low at 2.9 V and high at 3.2 V when I added a buck converter (LM2596) with nothing connected to it.
- 
- For context, this is what I planned to do.
- 
#4: Post edited
by
timelyfiasco
·
2020-09-08T07:20:09Z (about 4 years ago)
clarifications
I have a [MAX809](https://datasheets.maximintegrated.com/en/ds/MAX803-MAX810Z.pdf) with rst pin connected to the gate of [IRLML6344](https://www.infineon.com/dgdl/irlml6344pbf.pdf?fileId=5546d462533600a4015356689c44262c). When I have LED as load in the mosfet, the circuit works. Voltage is the same as the source. But when I replace it with a buck converter, the voltage drops to 2V.How can I fix this problem?P.S. Buck Converter turns on at 14V without it, LED turns on at 10V.
- I have a [MAX809](https://datasheets.maximintegrated.com/en/ds/MAX803-MAX810Z.pdf) with rst pin connected to the gate of [IRLML6344](https://www.infineon.com/dgdl/irlml6344pbf.pdf?fileId=5546d462533600a4015356689c44262c).
- I will rephrase my question.
- At 4V, RST is also 4V and the LED lights up. But if I add the fan, RST drops to 0V. Adding a 0.1uF cap solved this problem. What is happening here?
- 
- So I added the MOSFET to the circuit but RST drops to 0V again when I connect a load. I have isolated the problem to the MAX809. I am thinking of using TP431 to replace MAX809. But is this a normal behavior?
- 
- For context, this is what I planned to do.
- 
#3: Post edited
by
timelyfiasco
·
2020-09-07T08:08:26Z (about 4 years ago)
- I have a [MAX809](https://datasheets.maximintegrated.com/en/ds/MAX803-MAX810Z.pdf) with rst pin connected to the gate of [IRLML6344](https://www.infineon.com/dgdl/irlml6344pbf.pdf?fileId=5546d462533600a4015356689c44262c). When I have LED as load in the mosfet, the circuit works. Voltage is the same as the source. But when I replace it with a buck converter, the voltage drops to 2V.
- How can I fix this problem?
- P.S. Buck Converter turns on at 14V without it, LED turns on at 10V.
- I have a [MAX809](https://datasheets.maximintegrated.com/en/ds/MAX803-MAX810Z.pdf) with rst pin connected to the gate of [IRLML6344](https://www.infineon.com/dgdl/irlml6344pbf.pdf?fileId=5546d462533600a4015356689c44262c). When I have LED as load in the mosfet, the circuit works. Voltage is the same as the source. But when I replace it with a buck converter, the voltage drops to 2V.
- How can I fix this problem?
- P.S. Buck Converter turns on at 14V without it, LED turns on at 10V.
#2: Post edited
by
timelyfiasco
·
2020-09-07T08:08:12Z (about 4 years ago)
- I have a [MAX809](https://datasheets.maximintegrated.com/en/ds/MAX803-MAX810Z.pdf) with rst pin connected to the gate of [IRLML6344](https://www.infineon.com/dgdl/irlml6344pbf.pdf?fileId=5546d462533600a4015356689c44262c). When I have LED as load in the mosfet, the circuit works. Voltage is the same as the source. But when I replace it with a buck converter, the voltage drops to 2V.
How can I fix this problem?
- I have a [MAX809](https://datasheets.maximintegrated.com/en/ds/MAX803-MAX810Z.pdf) with rst pin connected to the gate of [IRLML6344](https://www.infineon.com/dgdl/irlml6344pbf.pdf?fileId=5546d462533600a4015356689c44262c). When I have LED as load in the mosfet, the circuit works. Voltage is the same as the source. But when I replace it with a buck converter, the voltage drops to 2V.
- How can I fix this problem?
- P.S. Buck Converter turns on at 14V without it, LED turns on at 10V.
#1: Initial revision
by
timelyfiasco
·
2020-09-07T03:57:09Z (about 4 years ago)
Circuit Stops Working Depending on Load
I have a [MAX809](https://datasheets.maximintegrated.com/en/ds/MAX803-MAX810Z.pdf) with rst pin connected to the gate of [IRLML6344](https://www.infineon.com/dgdl/irlml6344pbf.pdf?fileId=5546d462533600a4015356689c44262c). When I have LED as load in the mosfet, the circuit works. Voltage is the same as the source. But when I replace it with a buck converter, the voltage drops to 2V. How can I fix this problem?