Overview
The TPA3138D2PWPR is a high-efficiency, low-idle-current Class-D stereo audio amplifier produced by Texas Instruments. This device is designed to drive stereo speakers with loads as low as 3.2-Ω and operates within a wide supply voltage range of 3.5-V to 14.4-V. It is particularly suited for power-sensitive applications such as Bluetooth speakers, battery-powered appliances, and other consumer audio equipment. The amplifier features advanced EMI suppression with Spread Spectrum Control, allowing the use of inexpensive ferrite bead filters to meet EMC requirements. It also integrates essential protection features including undervoltage, overvoltage, power limit, short circuit, overtemperature, and DC speaker protection, all with automatic recovery.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package | HTSSOP (PWP) | - |
| Pins | 28 | - |
| Operating Temperature Range | -40 to 85 | °C |
| Supply Voltage (PVCC, AVCC) | 3.5 to 14.4 | V |
| Continuous Output Power (BTL, THD+N = 1%, f = 1 kHz, PVCC = 12 V, RL = 6 Ω) | 10 W | - |
| Continuous Output Power (BTL, THD+N = 10%, f = 1 kHz, PVCC = 12 V, RL = 4 Ω) | 18.5 W | - |
| THD+N at 1 W, 1 kHz input, 6-Ω | 0.04% | - |
| Idle Current (1SPW Mode, 12-V) | 21 mA | - |
| Efficiency | >90% Class-D Efficiency | - |
| Junction-to-Ambient Thermal Resistance (RθJA) | 30.3 °C/W | - |
Key Features
- Wide Supply Range: Operates from 3.5-V to 14.4-V.
- High Efficiency: >90% Class-D efficiency for longer battery life in portable applications.
- Low Idle Current: 21-mA idle current in 1SPW mode at 12-V supply.
- Inductor-Free Operation: Reduces solution size and cost.
- EMC Compliance: EN55013 and EN55022 compliant without inductors.
- No External Heatsink Required: Integrated thermal protection and automatic recovery.
- Flexible Audio Solution: Single-ended or differential analog inputs, selectable gain (20 dB and 26 dB).
- Integrated Protections: Undervoltage, overvoltage, power limit, short circuit, overtemperature, and DC speaker protection.
- Pin-to-Pin Compatibility: Compatible with TPA3110D2, TPA3136D2, and TPA3136AD2.
- Pop and Click-Free Startup: Ensures smooth audio startup.
Applications
- Bluetooth Speakers and Wireless Speakers: Ideal for battery-powered audio devices.
- Audio Amplifiers in Smart Appliances: Suitable for smart home devices requiring efficient audio amplification.
- Audio Speakers in Internet of Things (IoT) Devices: Used in various IoT applications where power efficiency is crucial.
- Consumer Audio Equipment: Applicable in a wide range of consumer audio products.
Q & A
- What is the operating voltage range of the TPA3138D2PWPR?
The TPA3138D2PWPR operates within a supply voltage range of 3.5-V to 14.4-V.
- What is the maximum output power of the TPA3138D2PWPR?
The device can deliver up to 10 W per channel into 6-Ω loads with 1% THD+N at a 12-V supply, and up to 18.5 W into 4-Ω loads with 10% THD+N.
- What is the idle current of the TPA3138D2PWPR in 1SPW mode?
The idle current in 1SPW mode is 21 mA at a 12-V supply.
- Does the TPA3138D2PWPR require external inductors?
No, the TPA3138D2PWPR operates inductor-free, reducing solution size and cost.
- What kind of protections does the TPA3138D2PWPR have?
The device includes undervoltage, overvoltage, power limit, short circuit, overtemperature, and DC speaker protection, all with automatic recovery.
- Is the TPA3138D2PWPR compatible with other Texas Instruments amplifiers?
Yes, it is pin-to-pin compatible with TPA3110D2, TPA3136D2, and TPA3136AD2.
- What is the thermal resistance of the TPA3138D2PWPR?
The junction-to-ambient thermal resistance (RθJA) is 30.3 °C/W.
- Does the TPA3138D2PWPR require an external heatsink?
No, it does not require an external heatsink due to its integrated thermal protection features.
- What types of audio inputs does the TPA3138D2PWPR support?
The device supports single-ended or differential analog inputs and has selectable gain (20 dB and 26 dB).
- How does the TPA3138D2PWPR handle EMI?
The device features advanced EMI suppression with Spread Spectrum Control, allowing the use of inexpensive ferrite bead filters to meet EMC requirements.
