Output Power 1 % THD+N, 20 Hz 20 kHz (SE): 125 W (4 Ω), 150 W (8 Ω)
Output Power 1 % THD+N, 20 Hz 20 kHz (BTL): 450 W (4 Ω)
Output Power 10 % THD+N, 20 Hz 20 kHz (SE): 150 W (4 Ω)
Output Power 10 % THD+N, 20 Hz 20 kHz (BTL): 550 W (4 Ω)
Minimum load impedance: 3 Ω
Maximum amplifier efficiency: >90 %
Maximum total amp+psu efficiency: 86 %
Supply voltage input (Selectable): 85-264 VAC
Peak output current: 20 A
Dynamic range (SE): 117 dB
Dynamic range (BTL): 121 dB
Amplifier maximum output voltage per channel: 32 V (SE), 60 V (BTL)
Output referenced idle noise (A-weighted) (SE): 30 µV
Output referenced idle noise (A-weighted) (BTL): 36 µV
THD+N 1W/1kHz: 0.003 %
EMC and safety approved
Design Considerations
The Icepower 125asx2 module is a "black-box" solution that allows for fast design-in and minimized time to market. However, there are some design considerations that should be taken into account when using the module. Here are some of them:
Cooling: The module has a built-in temperature sensor that will reduce the output power if the temperature exceeds a certain limit. Therefore, it is important to provide adequate cooling for the module, especially when operating at high power levels or in high ambient temperatures. The module should be mounted on a metal chassis or heatsink with good thermal conductivity and ventilation. The recommended minimum clearance around the module is 10 mm on all sides.
Wiring: The module has screw terminals for connecting the input and output wires. The recommended wire gauge for the input is AWG18-14, and for the output is AWG14-10. The wires should be stripped to a length of about 6 mm and tightened securely. The input wires should be twisted together to reduce noise pickup. The output wires should be kept as short as possible to avoid parasitic inductance and capacitance. The speaker load should be connected directly to the output terminals without any intermediate connectors or switches.
Input Signal: The module has a differential input stage that accepts both balanced and unbalanced signals. The input impedance is about 10 kΩ. The input sensitivity can be adjusted by changing the value of the feedback resistor Rf on the module. The default value of Rf is 22 kΩ, which gives a gain of about +25 dB. To change the gain, Rf can be replaced with another resistor according to the formula: Gain = Rf / Rg +1, where Rg is the fixed resistor on the module (887 Ω). For example, to reduce the gain to +20 dB, Rf can be replaced with a 18 kΩ resistor. The input signal should not exceed the maximum input voltage of the module, which is about 2.8 Vrms.
Output Mode: The module can operate in two output modes: single-ended (SE) or bridged-tied load (BTL). In SE mode, each channel of the module drives a separate speaker load. In BTL mode, the two channels of the module are combined to drive a single speaker load with twice the voltage and four times the power. To switch between the modes, the BTL/SE jumper on the module should be set accordingly. In BTL mode, the speaker load should be connected between the + terminals of the two channels, and the - terminals should be left open. The speaker load impedance should not be lower than 4 Ω in BTL mode.
Protection: The module has several protection features that protect it from overcurrent, overvoltage, undervoltage, short-circuit, DC offset, and overtemperature. If any of these conditions occur, the module will shut down or reduce the output power until the condition is removed. The module also has a mute function that can be controlled by applying a logic signal to the MUTE pin on the module. When the MUTE pin is low, the module is muted and consumes very little power. When the MUTE pin is high, the module is unmuted and ready to play. The MUTE pin can be connected to a switch or a microcontroller for remote control.
Conclusion
The Icepower 125asx2 is a versatile and powerful audio amplifier module that can be used for various applications. It offers high efficiency, low distortion, wide bandwidth, and compact size. It is easy to use and requires minimal external components. It is also reliable and robust, with built-in protection and regulation features. It is an ideal choice for DIY audio enthusiasts and professional audio designers who want to create high-quality audio products with minimal effort and cost.
References:
: [ICEpower 125ASX2 - ICEpower Shop]
: [ICEPower 125ASX2 Class D Amplifier Review]
: [ICEpower125ASX2 Datasheet]
: [ICEPOWER125ASX2 125W Class D amp with resonant gearbox power supply]
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