HT82V7534 Datasheet, PDF (1/16 Pages) Holtek Semiconductor Inc – 3W Stereo Filter-free Class-D Audio Power Amplifier

HT82V7534
3W Stereo Filter-free
Class-D Audio Power Amplifier
Features
• 1.8V to 6V Single Supply
• Output Power:
♦♦ _{3W/channel at 5V and 4Ω speaker}
♦♦ _{4.45W/channel at 6V and, 4Ω speaker}
• Up to 90% power efficiency
• Automatic output power control – APC
• 2.8mA quiescent current at 5V
• Less than 0.2µA shutdown current
• Pop noise elimination during power on/off
• Mute and Shutdown function
• Output pin short circuit protection with auto recovery
• Over-temperature and over-current protection with
auto recovery
• Integrated hard limiter function
• Limiter time and gain control on the fly
• Differential 250kHz PWM allows Bridge-Tied-
Load to increase output power and eliminate LC
output filter
• Differential signal processing for improved CMRR
• 20-pin TSSOP-EP package
Applications
• Portable audio products
• Battery powered audio products
• MP3 players
• Bluetooth speakers
• Notebook/Tablet PCs
• Smartphones
Description
The HT82V7534 is a filter-less stereo Class D audio
power amplifier IC. The device can deliver up to 3
watts per channel into a 4Ω load at a 5V operating
voltage. The advantage of using class D amplifiers is
that they offer superior efficiency over the traditional
linear amplifiers. This advantage results in less heat
generation thus eliminating the need for heat sinking
making them ideal for use in small outline products.
One special feature of the device is its ability to
operate over a wide voltage range, from 1.8V to
6V. Additional features include automatic power
level control, wherein the output power remains
consistent for different voltages. A function to reduce
the annoying "pop" sound which could be generated
during power on/off operations is also included. The
device contains a range of protection features, such as
output short circuit protection, over current/thermal
shutoff and auto recovery functions which restores
the device to normal operation once the source of the
problem has been resolved.
The superior efficiency of this Holtek class D audio
amplifier together with its wide operating voltage and
ability to directly drive speakers make it excellent for
use in compact portable battery operated equipment
where battery life will be an important consideration.
Block Diagram
LINP
15K
LINN
SDNB
MUTE
LIM
15K
200K
200K
200K
RINP
15K
15K
RINN
PWM
Power
Drive
LOUTP
LOUTN
Control
Circuitry
VDD X 4
GND X 2
AVDD
AVSS
CAP
PWM
Power
Drive
ROUTP
ROUTN
Rev. 1.00
1
January 01, 2016