Overview
The LA4425A-E, produced by onsemi, is a 5W power amplifier designed with a minimal number of external components. It is packaged in the smallest industry-standard SIP-5H (TO-126 type) package, making it highly compact and efficient. This amplifier is particularly suited for applications such as car radios and car stereos due to its robust features and simplified control functions.
Key Specifications
| Parameter | Symbol | Conditions | Ratings | Unit |
|---|---|---|---|---|
| Maximum supply voltage | VCC max | Rg = 0 | 18 | V |
| Surge maximum supply voltage | VCC surge | Giant pulse 200ms, Rise time 1ms | 50 | V |
| Maximum output current | IO peak | 3.3 | A | |
| Allowable power dissipation | Pd max | With infinite heat sink | 7.5 | W |
| Operating temperature | Topr | -30 to +80 | °C | |
| Storage temperature | Tstg | -40 to +150 | °C | |
| Recommended supply voltage | VCC | 13.2 | V | |
| Recommended load resistance | RL | 4 | Ω | |
| Quiescent current | ICCO | VCC = 13.2V, RL = 4Ω, f = 1 kHz, Rg = 600Ω | 65 - 130 | mA |
| Voltage gain | VG | VO = 0dBm | 43 - 47 | dB |
| Output power | PO1 | VCC = 13.2V / 4Ω, THD = 10% | 4 - 5 | W |
| Total harmonic distortion | THD | VO = 2V | 0.1 - 1.0 | % |
| Ripple rejection ratio | SVRR1 | Rg = 0, BPF = 20 Hz to 20 kHz, VR = 0dBm, fR = 100Hz | 30 - 40 | dB |
Key Features
- Wide operation supply range: The LA4425A operates within a supply voltage range of 5 to 16V, making it versatile for various applications.
- On-chip protection: Includes over-voltage protection, thermal protection, and output D.C. short protection to ensure the IC's reliability and longevity.
- Pop noise reducing circuit: An on-chip circuit designed to reduce pop noise, enhancing the audio quality.
- Minimal external components: Requires only two external parts (input and output coupling capacitors), simplifying the circuit design and reducing the overall component count.
- Fixed voltage gain: The voltage gain is fixed at 45dB, eliminating the need for external gain adjustment.
- Phase compensation: Internal phase compensation capacitors are included to prevent high-frequency parasitic oscillations.
Applications
The LA4425A-E is primarily designed for use in car radios and car stereos due to its robust performance and compact design. It is also suitable for other audio amplification applications where a reliable and efficient power amplifier is required.
Q & A
- What is the maximum supply voltage for the LA4425A-E?
The maximum supply voltage is 18V, with a surge maximum supply voltage of 50V for giant pulses.
- What is the recommended load resistance for the LA4425A-E?
The recommended load resistance is 4Ω.
- What are the key protection features of the LA4425A-E?
The IC includes over-voltage protection, thermal protection, and output D.C. short protection.
- How many external components are required for the LA4425A-E?
Only two external components are required: input and output coupling capacitors.
- What is the fixed voltage gain of the LA4425A-E?
The voltage gain is fixed at 45dB.
- What is the operating temperature range for the LA4425A-E?
The operating temperature range is -30 to +80°C.
- What is the storage temperature range for the LA4425A-E?
The storage temperature range is -40 to +150°C.
- How does the pop noise reducing circuit work in the LA4425A-E?
The pop noise reducing circuit operates to reduce pop noise until the input resistance (Rg) reaches 50kΩ.
- Can the voltage gain of the LA4425A-E be adjusted externally?
No, the voltage gain is fixed internally and cannot be adjusted externally.
- What is the thermal shutdown temperature for the LA4425A-E?
The thermal shutdown temperature is approximately 120 to 130°C at the case temperature (Tc), which corresponds to a junction temperature (Tj) of about 165°C.
