Many of you have reached out to me through messages on the Ornate Pixels Facebook page, seeking advice on troubleshooting audio issues in Sony Bravia smart TVs, especially after struggling to understand the complex digital audio input system. Due to these common repair challenges, I noticed through targeted keyword research that many technicians frequently search Google for the 28623 schematic circuit diagram PDF download and its exact pin configuration or 28623 sound IC pinout diagram.
Based on my extensive bench repair experience with the BD28623MUV audio amplifier IC in my lab, I have published the original schematic circuit diagram below. To make your diagnostic process even easier, I have carefully gathered, verified, and compiled the complete pin descriptions and precise voltage details directly from the manufacturer's technical manual in the comprehensive reference guide below.
BD28623MUV Pinout Configuration & Technical Reference Table
| Pin No. | Pin Name | Pin Voltage | Pin Descriptions & Functions |
|---|---|---|---|
| 1 | MCLK | - | Master Clock - Digital sound signal input pin. |
| 2 | SDATA | - | Serial Data - Digital sound signal input pin. |
| 3 | BCLK | - | Bit Clock - Digital sound signal input pin. |
| 4 | LRCLK | - | Left/Right Clock - Digital sound signal input pin. |
| 5 | PLIMT | 0V | Gain setting pin for volume configuration. |
| 6 | RSTX | 0V | Reset pin (H: Reset OFF, L: Reset ON). |
| 7 | MUTEX | 0V | Speaker output mute control pin (H: Mute OFF, L: Mute ON). |
| 8 | OUT1P | VCC to 0V | Output pin of Ch1 positive PWM signal. *Do not short to GND. |
| 9 | BSP1P | - | Bootstrap pin of Ch1 positive PWM signal. |
| 10 | VCCP1 | VCC | Power supply pin for Ch1 PWM signal. |
| 11 | GNDP1 | 0V | GND pin for Ch1 PWM signal. |
| 12 | BSP1N | - | Bootstrap pin of Ch1 negative PWM signal. |
| 13 | OUT1N | VCC to 0V | Output pin of Ch1 negative PWM signal. *Do not short to GND. |
| 14 | VCCA | VCC | Power supply pin for the analog signal. |
| 15 | GNDA | 0V | GND pin for the analog signal. |
| 16 | REGD | 5.0V | Internal power supply pin for the digital circuit. |
| 17 | REGG | 5.7V | Internal power supply pin for the gate driver. |
| 18 | BSP2P | - | Bootstrap pin of Ch2 positive PWM signal. |
| 19 | OUT2P | VCC to 0V | Output pin of Ch2 positive PWM signal. *Do not short to GND. |
| 20 | VCCP2 | VCC | Power supply pin for Ch2 PWM signal. |
| 21 | GNDP2 | 0V | GND pin for Ch2 PWM signal. |
| 22 | BSP2N | - | Bootstrap pin of Ch2 negative PWM signal. |
| 23 | OUT2N | VCC to 0V | Output pin of Ch2 negative PWM signal. *Do not short to GND. |
| 24 | ERROR | - | Error flag pin (H: Normal, L: Error). Triggered by Short, DC offset, or Overheat. |
BD28623MUV Internal Architecture & Class-D Overview
The architecture of the BD28623MUV or 28623 IC is entirely different from a traditional linear amplifier, as it is engineered specifically as a high-efficiency Class-D digital audio amplifier. Built in a compact VQFN 24-pin package, this chip utilizes an advanced BCD (Bipolar, CMOS, and DMOS) process technology. To deliver powerful stereo output to both the left and right speakers, the internal circuitry of the BD28623MUV incorporates high-speed power DMOSFETs configured in a full H-bridge layout. This modern integration allows the IC to switch massive currents at ultra-high frequencies while maintaining exceptionally low power consumption and heat generation, completely eliminating the need for any bulky external heat sink.
I have seen the 28623 IC widely used in premium smart TVs from world-renowned brands such as Sony Bravia and Samsung. According to the official documentation from its manufacturer (ROHM), this chip is capable of driving a robust 20W + 20W of high-quality, low-distortion audio, making it an ideal choice for compact home entertainment sound systems. Furthermore, its intelligent internal structure includes a built-in slew rate controller that dampens voltage spikes, meaning you do not even need to install an extra external snubber circuit when operating within standard voltage limits.
BD28623MUV Schematic Circuit Diagram
|
Figure 1: Sony Bravia BD28623MUV Class-D Digital Audio Amplifier Application Schematic Circuit Diagram. |
Required Components List & Value Specifications
Below are the verified peripheral component values extracted from the BD28623MUV IC datasheet, configuration optimized for Stereo BTL Output operations:
- Capacitors:
- C1, C2, C3, C4: 0.68µF (50V Electronic/Ceramic)
- C5, C6: 3.3µF (50V Electrolytic)
- C7, C8: 10µF (SMD/Filter)
- C9, C10: 0.1µF (50V Bypass)
- Resistors:
- R1, R2, R3, R4: 0Ω (0.1W - 0603 Jumper Link)
- R5: 100KΩ (1/16W - 0402 SMD)
- R6: 10KΩ (Standard Config)
- R7: 100KΩ (1/16W - 0402 SMD)
- Inductors (LC Filter):
- L1, L2, L3, L4: 10µH (High-Current Audio Inductors)
Understanding Digital Audio Input & Control Signal Tracks
To fix problems with the BD28623MUV IC, a technician needs to know about the audio input and the control signal tracks. The digital audio data goes through a 4-wire I2S/LJ interface. This interface has MCLK, SDATA, BCLK, and LRCLK. If any of these lines lose their signal for a very short time, the internal Class-D DAC cannot decode the sound. This means there will be no sound at all.
The RESETX and MUTEX are like the chip's guards. They operate on active-low logic. This means they need a steady high voltage, usually 3.3V or 5V, to keep the amplifier working and not muted.
Pro Repair Tip for Technicians: If you are working on a Sony Bravia TV and it has no sound, do not replace the IC right away. First, check the power supply. If the power supply is okay, use a multimeter to check the resistors on the input and control tracks. These resistors, like R1, R2, R3, and R4, can get damaged because of power surges or static electricity. They might stop working or change their resistance value. This can cut off the clock or control voltages and make the IC stop working.
Recommended Related Posts for Technicians
If you are interested in smart TV troubleshooting and high-power audio amplifier projects, I highly recommend checking out these verified guide articles from my lab:
- Sony Bravia Protection Fix: Sony Bravia TV Red Light Blinking 2 Times Error Solution & Power Supply Repair Guide
- Classic Audio Circuit: TDA2050 IC Dual and Single Power Supply Audio Amplifier Circuit Diagram
- High-Power Class-D Project: IRS2092 Class-D Audio Amplifier Circuit Diagram with MOSFET Configuration
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