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## Technical Specifications
| Parameter | Specification |
|------|------|
| **Number of Channels** | 4 channels (quad BTL bridge outputs) |
| **Output Power** | 4 × 28 W / 4Ω @ 14.4V, 1kHz, 10% THD |
| **Max. Output Power** | 4 × 50 W / 4Ω (peak) |
| **Max. Output Power (2Ω)** | 4 × 72 W |
| **Supply Voltage Range** | 8 V – 18 V |
| **Typical Supply Voltage** | 14.4 V (car battery) |
| **Operating Temperature Range** | -55°C to +150°C (junction temperature Tj) |
| **Max. Power Dissipation** | 85 W |
| **Total Harmonic Distortion (THD+N)** | 0.03% @ 4Ω @ 10W; 0.02% @ 4Ω @ 1.5W |
| **Common-Mode Rejection Ratio (CMRR)** | ≥ 55 dB |
| **Max. Gain** | 30 dB / 16 dB (selectable via I2C) |
| **Input Offset Voltage** | 100 mV |
| **Package** | Flexiwatt27 (through-hole) / PowerSO36 (SMD, HSSOP-36) |
| **Pin Count** | 27 (Flexiwatt) / 36 (PowerSO36) |
| **Mounting Type** | Through-hole (Flexiwatt) / Surface mount (PowerSO36) |
| **RoHS Status** | Compliant |
| **Product Lifecycle** | Active (in mass production) |
### Electrical Characteristics
| Parameter | Test Conditions | Min. | Typ. | Max. | Unit |
|------|----------|--------|--------|--------|------|
| **Supply Voltage VCC** | — | 8 | 14.4 | 18 | V |
| **Quiescent Current** | Standby mode | — | — | Low power | µA |
| **Output Power** | 4Ω, 14.4V, 1kHz, 10% THD | — | 28 | — | W/channel |
| **Output Power** | 4Ω, 14.4V, 1kHz, 1% THD | — | — | — | W/channel |
| **Total Harmonic Distortion (THD+N)** | 4Ω, 10W, 1kHz | — | 0.03 | — | % |
| **Total Harmonic Distortion (THD+N)** | 4Ω, 1.5W, 1kHz | — | 0.02 | — | % |
| **Gain** | High-gain mode | — | 30 | — | dB |
| **Gain** | Low-gain mode | — | 16 | — | dB |
| **Common-Mode Rejection Ratio (CMRR)** | — | 55 | — | — | dB |
### Protection Features
| Parameter | Specification |
|------|------|
| **Short-Circuit Protection** | Four independent short-circuit protections (to GND, to Vcc, across load) |
| **Thermal Protection** | Linear thermal shutdown with multi-level thermal warning |
| **DC Offset Detection** | Built-in output DC offset detection |
| **Clipping Detection** | Clipping detection pin; selectable threshold (2% / 10%) |
| **ESD Protection** | Built-in ESD protection |
| **Diagnostic Functions** | Full I2C bus digital diagnostics (DC and AC load detection) |
---
## Pin Definitions / Wiring Instructions
### Flexiwatt27 Package Pinout (Top View)
| Pin No. | Name | Function |
|--------|------|------|
| **1** | **TAB** | Heatsink (connect to power ground) | |
| **2** | **OUT RR-** | Right Rear Channel Negative Output |
| **3** | **OUT RR+** | Right Rear Channel Positive Output |
| **4** | **PW_GND RR** | Right Rear Channel Power Ground |
| **5** | **VCC2** | Power Supply 2 |
| **6** | **OUT RF-** | Right Front Channel Negative Output |
| **7** | **VCC1** | Power Supply 1 |
| **8** | **OUT LF+** | Left Front Channel Positive Output |
| **9** | **PW_GND LF** | Left Front Channel Power Ground |
| **10** | **OUT LF-** | Left Front Channel Negative Output |
| **11** | **SVR** | Supply Voltage Rejection/Filtering |
| **12** | **IN LF** | Left Front Channel Input |
| **13** | **IN LR** | Left Rear Channel Input |
| **14** | **S_GND** | Signal Ground |
| **15** | **IN RR** | Right Rear Channel Input |
| **16** | **IN RF** | Right Front Channel Input |
| **17** | **AC_GND** | AC Ground |
| **18** | **OUT LR+** | Left Rear Channel Positive Output |
| **19** | **PW_GND LR** | Left Rear Channel Power Ground |
| **20** | **OUT LR-** | Left Rear Channel Negative Output |
| **21** | **VCC2** | Power Supply 2 |
| **22** | **OUT RF+** | Right Front Channel Positive Output |
| **23** | **PW_GND RF** | Right Front Channel Power Ground |
| **24** | **CK** | I2C Clock |
| **25** | **DATA** | I2C Data |
| **26** | **STBY** | Standby/Mute Control |
| **27** | **TAB** | Heatsink (connected to power ground) |
### PowerSO36 Package Pinout (Top View)
| Pin No. | Name | Function |
|---------|------|----------|
| **1** | **VCC** | Power Supply |
| **2** | **OUT3-** | Channel 3 Negative Output |
| **3** | **N.C.** | No Connection |
| **4** | **OUT4+** | Channel 4 Positive Output |
| **5** | **N.C.** | No Connection |
| **6** | **PWGND** | Power Ground |
| **7** | **VCC** | Power Supply |
| **8** | **DATA** | I2C Data |
| **9** | **STBY** | Standby/Mute |
| **10** | **IN2** | Channel 2 Input |
| **11** | **SGND** | Signal Ground |
| **12** | **IN1** | Channel 1 Input |
| **13** | **SVR** | Supply Voltage Rejection |
| **14** | **PWGND** | Power Ground |
| **15** | **N.C.** | No Connection |
| **16** | **OUT1+** | Channel 1 Positive Output |
| **17** | **PWGND** | Power Ground |
| **18** | **N.C.** | No Connection |
| **19** | **OUT2+** | Channel 2 Positive Output |
| **20** | **N.C.** | No Connection |
| **21** | **VCC** | Power Supply |
| **22** | **OUT1-** | Channel 1 Negative Output |
| **23** | **N.C.** | No Connection |
| **24** | **OUT2-** | Channel 2 Negative Output |
| **25** | **OUT4-** | Channel 4 negative output |
| **26** | **N.C.** | No connection |
| **27** | **OUT3+** | Channel 3 positive output |
| **28** | **PWGND** | Power ground |
| **29** | **ACGND** | AC ground |
| **30** | **IN3** | Channel 3 input |
| **31** | **IN4** | Channel 4 input |
| **32** | **N.C.** | No connection |
| **33** | **N.C.** | No connection |
| **34** | **CK** | I2C clock |
| **35** | **CD** | Clipping detection output |
| **36** | **TAB** | Thermal pad |
### I2C Bus Control Functions
| Function | Description |
|------|------|
| **Standby** | Enter low-power standby mode via I2C |
| **Independent Front/Rear Soft Play/Mute** | Independent mute control for front and rear channels |
| **Gain Selection** | Selectable 30 dB / 16 dB (16 dB for low-noise line output) |
| **High-Efficiency Mode** | Enable/disable SB-class high-efficiency mode |
| **Digital Diagnostics** | Read DC and AC load detection diagnostic information via I2C bus |
---
## Typical Application Circuits
### 1. Typical Application: Car Audio Head Unit Power Amplifier
```
+12V (Car Battery)
│
├──┬─────────────────────────────┐
│ │ │
│ C7 (3300µF) │
│ │ │
│ ├──→ VCC1 (Pin 7) │
│ └──→ VCC2 (Pin 5/21) │
│ │ │
│ TDA7563B │
│ (4-Channel Power Amp IC) │
│ │ │
│ IN RF (Pin 16) ←─────────────┤← Right Front Audio Input (via C1=0.22µF)
│ IN RR (Pin 15) ←─────────────┤← Right Rear Audio Input (via C2=0.22µF)
│ IN LF (Pin 12) ←─────────────┤← Left Front Audio Input (via C3=0.22µF)
│ IN LR (Pin 13) ←─────────────┤← Left Rear Audio Input (via C4=0.22µF)
│ │ │
│ OUT RF+ (Pin 22) ────────────┤→ Right Front Speaker (+)
│ OUT RF- (Pin 6) ─────────────┤→ Front Right Speaker (-)
│ OUT RR+ (Pin 3) ─────────────┤→ Rear Right Speaker (+)
│ OUT RR- (Pin 2) ─────────────┤→ Rear Right Speaker (-)
│ OUT LF+ (Pin 8) ─────────────┤→ Front Left Speaker (+)
│ OUT LF- (Pin 10) ────────────┤→ Front Left Speaker (-)
│ OUT LR+ (Pin 18) ────────────┤→ Rear Left Speaker (+)
│ OUT LR- (Pin 20) ────────────┤→ Rear Left Speaker (-)
│ │ │
│ CK (Pin 24) ←───────────────┤← I2C Clock (MCU)
│ DATA (Pin 25) ←─────────────┤← I2C Data (MCU)
│ STBY (Pin 26) ←─────────────┤← Standby/Mute Control
│ CD-OUT ←──────────────────┤→ Clipping Detection Output
│ │ │
│ S_GND (Pin 14) ──────────────┤→ Signal Ground
│ PW_GND ─────────────────────┤→ Power Ground
│ SVR (Pin 11) ────────────────┤→ Power Supply Filtering (C5=1µF, C6=10µF)
│ │
└────────────────────────────────┘
│
┌───────┴───────┐
│ │
Four Speakers (4Ω) Heatsink
│ │
──────┴───────────────┴────── Ground
```
### 2. I2C Bus Control Connections
```
MCU (Microcontroller)
│
├── SCL ───────────────────────→ TDA7563B CK (Pin 24)
│
├── SDA ───────────────────────→ TDA7563B DATA (Pin 25)
│
├── STBY Control ─────────────→ TDA7563B STBY (Pin 26)
│
└── CD-IN ←───────────────────
``` TDA7563B CD-OUT (Clipping Detection)
### 3. Diagnostic Function Block Diagram
```
TDA7563B Internal Diagnostic System
│
├── Short-circuit Protection & Diagnostics (Independent per channel)
│ │
│ ├── Short-to-GND Detection
│ ├── Short-to-VCC Detection
│ └── Speaker Short Detection
│
├── DC Offset Detection
│
├── Thermal Protection & Thermal Warning
│ │
│ ├── Linear Thermal Shutdown
│ └── Multi-level Thermal Warning
│
├── Clipping Detection (Selectable Threshold: 2%/10%)
│
└── I2C Bus Interface
│
└── Diagnostic Data Output to MCU
```
---
## Key Characteristic Curves
| Parameter | Conditions | Typical Value |
|------|------|--------|
| **Output Power vs. Supply Voltage** | 4Ω, 1kHz, 10% THD | 28W @ 14.4V |
| **Output Power vs. Load Impedance** | 14.4V, 1kHz, 10% THD | 28W/4Ω, 50W/2Ω |
| **THD+N vs. Output Power** | 4Ω, 1kHz | 0.02% @ 1.5W, 0.03% @ 10W |
| **THD+N vs. Frequency** | 4Ω, 1W | Low distortion up to 20kHz |
| **Efficiency vs. Output Power** | 4Ω, 14.4V | SB mode efficiency significantly higher than Class AB |
| **Gain vs. Frequency** | 30dB Mode | Flat response 20Hz-20kHz |
| **Thermal Resistance vs. Cooling Conditions** | Flexiwatt27 | Requires good thermal design |
---
## Common Faults and Diagnostics
| Fault Symptom | Possible Cause | Diagnostic Method |
|----------|----------|----------|
| **No audio output (all channels)** | Abnormal chip power supply, STBY not released, damaged chip | Measure VCC voltage (8–18V), check STBY pin level, measure quiescent current |
| **No audio on a specific channel** | Channel short-circuit protection triggered, abnormal input signal, open-circuit speaker | Read diagnostic registers via I2C, check corresponding input signal, measure speaker impedance |
| **Audio distortion/clipping** | Clipping, insufficient power supply, poor heat dissipation, chip aging | Check power supply stability, measure heatsink temperature, observe CD-OUT signal |
| **Low volume on a specific channel** | Incorrect gain setting, failed input coupling capacitor, internal chip damage | Check gain settings via I2C, replace input coupling capacitor (0.22µF) |
| **Startup protection (immediate mute)** | Output short-circuit, excessive DC offset, thermal protection triggered | Read fault codes via I2C, check speaker wiring, measure DC voltage at output |
| **Excessive heating** | Poor heat dissipation, load impedance too low, internal chip short-circuit | Check heatsink installation, measure load impedance, check for chip breakdown |
| **I2C communication failure** | Incorrect bus address, missing pull-up resistors, damaged chip | Check I2C pull-up resistors (typically 4.7kΩ), observe SCL/SDA waveforms with an oscilloscope |
### I2C Diagnostic Register Reference
| Diagnostic Bit | Meaning |
|--------|------|
| **Short to GND** | Output shorted to ground |
| **Short to VCC** | Output shorted to VCC |
| **Speaker short** | Speaker terminals shorted together |
| **DC offset** | Abnormal DC voltage present at output |
| **Open load** | Speaker not connected or open circuit |
| **Thermal warning** | Chip temperature approaching shutdown threshold |
| **Clipping Detection** | Output signal clipping distortion |
---
## Alternative Models and Competitors
| Model | Manufacturer | Key Differences |
|------|--------|--------|
| **TDA7563B** | STMicroelectronics | Original model, Flexiwatt27 package |
| **TDA7563BH** | STMicroelectronics | Horizontal-mount Flexiwatt27 package |
| **TDA7563BPD** | STMicroelectronics | PowerSO36 SMD package |
| **TDA7563BPDTR** | STMicroelectronics | PowerSO36 tape-and-reel packaging |
| **TDA7563BDD / 7563BDD** | STMicroelectronics | HSSOP-36 SMD package (marked "7563BDD") |
| **TDA7563A** | STMicroelectronics | Previous generation, similar functionality |
| **TDA7562** | STMicroelectronics | 4×25W/4Ω, lower power version |
| **TDA7564B** | STMicroelectronics | 4×50W, similar specifications |
| **TDA7850** | STMicroelectronics | 4×50W, Flexiwatt25 package |
| **TDA7851A** | STMicroelectronics | 4×48W, similar functionality |
| **TDA7388** | STMicroelectronics | 4×41W, ZIP25 package |
| **TDA7575B** | STMicroelectronics | Higher power version |
---
---
## Important Notes
- **Compatibility**: When replacing the TDA7563B/7563BDD, verify the following:
- **Package Match**: Flexiwatt27 (through-hole) vs. PowerSO36/HSSOP-36 (SMD)
- **Marking**: "7563BDD" is the marking for the HSSOP-36 package; compare with TDA7563B For the same chip
- **Supply voltage**: Ensure the car battery voltage is within the 8–18V range
- **Thermal design**: The Flexiwatt27 requires a heatsink; PoPowerSO36 package requires a large PCB copper area for heat dissipation
- **Speaker Impedance**: Standard 4Ω; supports 2Ω (power output increases to 72W/channel)
- **I2C Address**: Ensure it matches the MCU's I2C address
- **Installation Instructions**:
- **ESD Protection**: The chip is sensitive to static electricity; wear an anti-static wrist strap before handling
- **Heatsink Installation**: Apply thermal grease to the Flexiwatt27 package; tighten screws with appropriate torque
- **Soldering Temperature**: Reflow peak temperature ≤260°C (PowerSO36); control duration carefully during manual soldering
- **Input Coupling Capacitors**: Recommend replacing all four input coupling capacitors (0.22µF) when replacing the chip
- **Power Supply Filter Capacitor**: Check and replace the VCC filter capacitor (3300µF electrolytic capacitor)
- **I2C Pull-up Resistors**: Ensure SCL/SDA lines have 4.7kΩ pull-up resistors connected to +5V
- **Troubleshooting**:
- **No Sound at All**: Check if the STBY pin is high; measure the VCC supply voltage
- **No Sound on One Channel**: Read diagnostic registers via I2C to locate the faulty channel; check the corresponding speaker
- **Audio Distortion**: Check power supply stability and heat dissipation; observe the CD-OUT signal
- **Frequent Protection Triggering**: Check for low speaker impedance, short circuits, or inadequate heat dissipation
- **No I2C Response**: Check bus connections and pull-up resistors; measure SCL/SDA waveforms
- **Repair Recommendations**:
- TDA7563B/7563BDD chips in car audio head units are prone to failure; common causes include:
- Speaker short circuits or overload
- Overheating due to poor heat dissipation
- Abnormal power supply voltage (fluctuations in car battery voltage)
- Damage from static electricity or voltage surges
- Before replacing the chip, be sure to identify and resolve the root cause of the failure; otherwise, the new chip may be damaged again.
- It is recommended to inspect and replace the power supply filter capacitors and input coupling capacitors.
- Check if the thermal paste between the heatsink and the chip has dried out.
- If using 2Ω speakers, ensure the thermal design meets the requirements.
- **Technical Support**: For further technical assistance, please refer to the official STMicroelectronics datasheet or contact a professional automotive electronics repair service.
---
## Summary
The **TDA7563B (marked 7563BDD)** is a four-channel BTL (Bridge-Tied Load) audio power amplifier from STMicroelectronics. It utilizes Multipower BCD technology and a DMOS power output stage, delivering an output power of **28W/4Ω** per channel (14.4V, 10% THD), with a maximum output of **50W/4Ω**. The chip supports **Class AB** and **SB (High-Efficiency) modes** and features a comprehensive **I2C bus digital diagnostic system** capable of detecting faults such as short circuits, open circuits, DC offsets, and overheating.
This chip is widely used in the power amplifier stages of automotive head units for brands like **Audi** and **Volkswagen**, serving as a core component of the audio system. Due to the demanding electrical environment of vehicles (involving voltage fluctuations, temperature variations, and potential speaker short circuits), the TDA7563B/7563BDD is a component frequently prone to failure in automotive audio repairs. When performing repairs, attention must be paid to package compatibility (Flexiwatt27 through-hole or HSSOP-36 surface-mount), thermal design, power supply stability, and root cause analysis to ensure long-term reliability after replacement.
---
> **Disclaimer**: The information above is compiled based on official STMicroelectronics datasheets and aftermarket data. Specific parameters may vary depending on the package version (Flexiwatt27 / PowerSO36 / HSSOP-36) and production batch. Automotive electronics repair involves high voltages and precision components; it is recommended that repairs be performed by professional technicians to ensure safety and compliance.
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