Just checking if anyone knows what i can use for a replacement for a TC4427COA that's marked C2 on a Sundown SFB 8000D?
That driver was too slow in at least one amp. You could try it but something like the UCC27524 may be a better option. The enable terminals are often left unconnected. Wait to see if anyone can answer definitively. You could also try contacting Sundown, although I doubt that they will help.
I substituted the UCC27524, and it works great; however, I am still encountering an issue. In the video, it powers on quickly because I initiated it prior to recording I turned it off and on again for the video. The initial startup took approximately one minute. I understand that the capacitors needs to charge, but with 13.8 volts and 10 amps, it should have turned on faster, and the red protection LED was pulse until it started.
Video: HERE
Video: HERE
Attachments
Last edited:
Q: What was the lowest voltage at the amplifier during the period when it was starting?
A: I have just initiated the process, and during the minute when the red LED was pulsating, the voltage measured 13.8 volts. Every six seconds, it attempted to power on, causing the voltage to decrease to 13.7 volts. Upon successfully turning on, the voltage briefly dropped to 13.5 volts while drawing 7 amps, before stabilizing at 1.9 amps and 13.8 volts.
A: I have just initiated the process, and during the minute when the red LED was pulsating, the voltage measured 13.8 volts. Every six seconds, it attempted to power on, causing the voltage to decrease to 13.7 volts. Upon successfully turning on, the voltage briefly dropped to 13.5 volts while drawing 7 amps, before stabilizing at 1.9 amps and 13.8 volts.
Was it doing this when tested before you put it into the heatsink?
Have you looked at the drive waveforms?
Does this amp have a regulated power supply?
Have you looked at the drive waveforms?
Does this amp have a regulated power supply?
Q: Was it doing this when tested before you put it into the heatsink?
A: Its not in the heatsink
Q: Have you looked at the drive waveforms?
A: There is no waveform on IRS2092STRPBF but there is on the UCC27524.
Q: Does this amp have a regulated power supply?
A: Yes, the Power supply is working 100%
A: Its not in the heatsink
Q: Have you looked at the drive waveforms?
A: There is no waveform on IRS2092STRPBF but there is on the UCC27524.
Q: Does this amp have a regulated power supply?
A: Yes, the Power supply is working 100%
When the current draw decreases to 1.9a, does the duty cycle decrease?
Do the PS FETs heat up when it tries to power up?
Do the PS FETs heat up when it tries to power up?
With 10 amps, you will need to pulse the remote line a few times before the rail voltage is built up. 10 Amps is too low to switch the amp on when applying a remote. The rail voltage needs to build up to +100 volts for that amp to switch on fully. You will need a power supply with much higher amperage to switch this amp fully on when you switch on the remote. Once the amp is full on, you should have a current draw of around 3 to 5 amps. On the drive IC for the output fets, you will get drive out signals once the amp has built up full rail voltage.
Also, please make sure that you have a signal and a load connected to the amp when switching it on. If you are still going to be using your 10 amp power supply, I would suggest having the main gain turned all the way down.
Also, please make sure that you have a signal and a load connected to the amp when switching it on. If you are still going to be using your 10 amp power supply, I would suggest having the main gain turned all the way down.
Q: When the current draw decreases to 1.9a, does the duty cycle decrease?
A: No
Q: Do the PS FETs heat up when it tries to power up?
A: Yes but normal.
laluns:
I used my large 200 amp power supply, which the amp powers on quickly while providing stable power and still the power & clip LED is on. This video with probe on the S5 and S6 right leg, although I am uncertain whether it is the CT or CTR rectifier.
Here is the Video.
A: No
Q: Do the PS FETs heat up when it tries to power up?
A: Yes but normal.
laluns:
I used my large 200 amp power supply, which the amp powers on quickly while providing stable power and still the power & clip LED is on. This video with probe on the S5 and S6 right leg, although I am uncertain whether it is the CT or CTR rectifier.
Here is the Video.
To determine which rectifier is CT or CTR . The CTR center pins also connect to the 12-volt power terminal. The center pin of the CT connects to the positive of the rail cap.
