SI824X Datasheet, PDF (1/30 Pages) Silicon Laboratories – CLASS D AUDIO DRIVER WITH PRECISION DEAD-TIME GENERATOR

Si824x
CLASS D AUDIO DRIVER WITH PRECISION DEAD-TIME GENERATOR
Features
 0.5 A peak output (Si8241)
 Input to output isolation for low noise
 4.0 A peak output (Si8244)
(up to 2500 V)


PWM input

High-precision linear programmable ^
dead-time generator
Up to 8 MHz operation
Wide operating range
–40 to +125 °C
0.4 ns to 1 µs
 Transient immunity >45 kV/µs
 High latchup immunity >100 V/ns ^{ RoHS-compliant}
 Up to 1500 Vrms output-output
SOIC-16 narrow body
isolation, supply voltage of ±750 V
Applications
 Class D audio amplifiers
Ordering Information:
See page 25.
Description
The Si824x isolated driver family combines two isolated drivers in a single
package. The Si8241/44 are high-side/low-side drivers specifically targeted at
high-power (>30 W) audio applications. Versions with peak output currents of
0.5 A (Si8241) and 4.0 A (Si8244) are available. All drivers operate with a
maximum supply voltage of 24 V.
Based on Silicon Labs' proprietary isolation technology, the Si824x audio drivers
incorporate input-to-output and output-to-output isolation, which enables level-
translation of signals without additional external circuits as well as use of bipolar
supply voltage up to ±750 V. The Si824x audio drivers feature an integrated dead-
time generator that provides highly precise control for achieving optimal THD.
These products also have overlap protection that safeguards against shoot-
through current damage. The CMOS-based design also provides robust immunity
from latch-up and high-voltage transients. The extremely low propagation delays
enable faster modulation frequencies for an enhanced audio experience. The TTL
level compatible inputs with >400 mV hysteresis are available in PWM input
configuration; other options include UVLO levels of 8 V or 10 V. These products
are available in narrow body SOIC packages.
Functional Block Diagram
Pin Assignments
SOIC-16 (Narrow)
PWM
NC
VDDI
GNDI
DISABLE
DT
NC
VDDI
1
16
2
15
3
14
4_Si8241/44¹³
5
12
6
11
7
10
8
9
VDDA
VOA
GNDA
NC
NC
VDDB
VOB
GNDB
Patents Pending
PWM
DT
VDDI
UVLO
Programmable Dead
Time, Control Gating
DISABLE
GNDI
Si8241/44
VDDA
VOA
GNDA
VDDB
VOB
GNDB
Rev. 1.0 4/14
Copyright © 2014 by Silicon Laboratories
Si824x