Hello,
I want to operate two IRS2092 amplifiers in BTL mode. Both are on the common board and have a common power supply. Each has its own VCC. The BTL inverter opamp also has a separate power supply +/-15V. If both amplifiers are connected separately with the speaker to GND, both play excellently. They are able to deliver 2x 400W 8Ω (+/-80V). The problem is in bridge mode. With an 8Ω load in BTL it reaches a maximum of 100W, then growl and pulsate. as if the amplifiers are arguing. With a 16Ω load everything is fine and the power goes very high. Why is there a problem with BTL at 8Ω? Thank you for every comment. I am attaching a schematic of one amplifier. The second is identical.
I want to operate two IRS2092 amplifiers in BTL mode. Both are on the common board and have a common power supply. Each has its own VCC. The BTL inverter opamp also has a separate power supply +/-15V. If both amplifiers are connected separately with the speaker to GND, both play excellently. They are able to deliver 2x 400W 8Ω (+/-80V). The problem is in bridge mode. With an 8Ω load in BTL it reaches a maximum of 100W, then growl and pulsate. as if the amplifiers are arguing. With a 16Ω load everything is fine and the power goes very high. Why is there a problem with BTL at 8Ω? Thank you for every comment. I am attaching a schematic of one amplifier. The second is identical.
C2 is upside down.
Check the power supply is stable and you have the correct inverted signal before the input on one amplifier.
Check the power supply is stable and you have the correct inverted signal before the input on one amplifier.
With 8 ohm, a bridge amp has a load of 4 ohms for each single amp. The theoretical output is 4x the watt of the single amp. The current is 4 times as high, which will trigger the protection instead of blowing the FET's. Lower the voltage to 60 Volt and it should work with 8 ohms.
With 16 ohms you give the amps an 8 ohm load each, which is OK. The simple 1x1 of amp bridgeing.
With 16 ohms you give the amps an 8 ohm load each, which is OK. The simple 1x1 of amp bridgeing.