SG Micro SGM4700 Manual

GENERAL DESCRIPTION
The SGM4700 is a high-power, high efficiency, stereo
Class-D audio power amplifier with adjustable power limit
(APL) and automatic level control (ALC). It operates with a
wide range of supply voltages from 5V to 20V. With 15V
supply voltage, it can deliver 2 × 23W output power for a pair
of 4Ω speakers with 1% THD+N, or an ALC output power of 2
× 20W with THD+N less than 0.5%.
The high efficiency of SGM4700 extends battery life in playing
music and allows it to deliver an output power of 2 × 20W
without the need for a bulky heat sink on a two-layer system
board. Its high PSRR and low EMI emission reduce system
design and manufacturing complexities, as well as lower
system cost.
The SGM4700 features APL and ALC. The APL limits peak
audio outputs to a user-defined value to protect audio
speakers from excessive power dissipation or over-load. The
APL and ALC adjust the voltage gain of the audio amplifiers in
response to over-limit audio inputs, eliminating output clipping
distortion while maintaining a maximally allowed dynamic
range of audio outputs. The limiting voltage of APL and ALC
can be either a user-defined value or the supply voltage.
The SGM4700 can be configured into driving either a pair of
speakers in Bridge-Tied-Load (BTL) configuration for stereo
applications or a single speaker in Parallel BTL (PBTL)
configuration for mono applications.
The SGM4700 features two PWM modulation schemes for
Class-D audio amplifiers: Dual-Side-Modulation (DSM) and
Single-Side-Modulation (SSM).
In SGM4700, comprehensive protection modes against
various operating faults ensure its safe and reliable operation.
SG Micro Corp
www.sg-micro.com
High-Power Stereo Class-D Audio Power Amplifier
with Adjustable Power Limit and Automatic Level Control
FEATURES
● Wide Range of Supply Voltages from 5V to 20V
● Adjustable Power Limit to Safeguard Audio Speakers
● Automatic Level Control to Eliminate Output Clipping
● 4 Selectable Gain Settings: 20/26/30/34dB
● 3 Selectable ALC Dynamic Characteristics
● 2 Selectable PWM Frequencies with Optional
Spread-Spectrum: 360kHz and 500kHz
● 2 Selectable Modulation Schemes: SSM and DSM
● Optional PBTL Configuration for Mono Applications
● Maximum Output Power (THD+N = 1%) in Non-ALC
 2 × 32W (V = 18V, 4Ω + 33μH, BTL)
DD
 2 × 18W (V = 18V, 8Ω + 33μH, BTL)
DD
= 15V, 3Ω + 15μH, PBTL)
 33W (V
DD
● Maximum Output Power (THD+N < 0.5%) in ALC
 2 × 29W (V = 18V, 4Ω + 33μH, BTL)
DD
 2 × 16W (V = 18V, 8Ω + 33μH, BTL)
DD
 30W (V = 15V, 3Ω + 15μH, PBTL)
DD
● Wide ALC Dynamic Range: 12dB (V
● Low THD+N: 0.02% (V
● High PSRR: 80dB at 1kHz with SSM
● Protection Modes against Various Operating Faults
Including Under-Voltage, Over-Voltage, Over-Current,
Over-Temperature and DC-Detect
● Available in a Green TSSOP-28 (Exposed Pad)
Package
APPLICATIONS
Bluetooth/Wireless Speakers
Consumer Audio Speakers
Soundbars
SGM4700
= 12V)
DD
= 12V, 4Ω + 33μH, P
DD O
NOVEMBER 2023 – REV. A. 1
= 10W/CH)