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Old 23rd February 2014, 05:13 PM   #1
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Default NO POWER SINUS LIVE SL-A1500

SINUS LIVE SL-A1500:

In this amplifier, the fault is that without load (4 Ohms), in the OUTPUT I have 50 Vpp with a frequency of 20 - 250Hz (BF IN). But when I connect the load of 4 Ohms, and I apply BF IN (80Hz for example), I begin to raise the profit and the sign of exit is clean up to 7 Vpp with a consumption of 3 Amps without distortion. From 7,5 Vpp the sign starts being distorted (see fig attached)
And if I continue increasing the profit, the sign of exit every time distorts more and the consumption does not overcome 4 Amps
sinusoide.jpg


He forgives my English.
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Old 23rd February 2014, 05:16 PM   #2
ultra is offline ultra  Greece
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A photo of the board is always helpful.
Do you have signal in the gate pad of all fets?
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Old 23rd February 2014, 06:03 PM   #3
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Hi,

Thank you for your response.

There are PWM +72V @ 128Khz in "MOS DRV H" and the "MOS DRV L", exist -62V DC with 5.85V PWM @ 128Khz.

Richard,
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Old 23rd February 2014, 06:45 PM   #4
ultra is offline ultra  Greece
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ok, do you have this signal in all gate pads ?
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Old 24th February 2014, 07:49 PM   #5
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Yes, in all gates pads.
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Old 24th February 2014, 08:14 PM   #6
ultra is offline ultra  Greece
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Does the rail voltage drop when the signal starts to distort?
What is the input voltage during this distortion?
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Old 24th February 2014, 08:23 PM   #7
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+70 and -60Vdc with 5.85V PWM
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Old 24th February 2014, 09:28 PM   #8
ultra is offline ultra  Greece
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Why do you have this mismatch on the rails?
Can you locate the input of the amplifier section, so you can probe the signal?
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Old 25th February 2014, 05:55 AM   #9
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Quote:
Originally Posted by ultra View Post
Why do you have this mismatch on the rails?
Can you locate the input of the amplifier section, so you can probe the signal?

He may using the power supply GND as reference to his voltmeter causes mismatch reading.
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