SI824X Datasheet PDF - Silicon Laboratories
| Part Number | SI824X | |
| Description | CLASS D AUDIO DRIVER | |
| Manufacturers | Silicon Laboratories | |
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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
Up to 8 MHz operation
High-precision linear programmable Wide operating range
dead-time generator
–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
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
Ordering Information:
See page 25.
Pin Assignments
SOIC-16 (Narrow)
PWM
NC
VDDI
GNDI
DISABLE
DT
NC
VDDI
1 16
2 15
3 14
4 13
Si8241/44
5 12
6 11
7 10
89
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. 0.2 2/11
Copyright © 2011 by Silicon Laboratories
Si824x
This information applies to a product under development. Its characteristics and specifications are subject to change without notice.
Free Datasheet http://www.datasheet4u.com/
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Si824x
2. Electrical Specifications
Table 1. Electrical Characteristics1
4.5 V < VDDI < 5.5 V, VDDA = VDDB = 12 V or 15 V. TA = –40 to +125 °C. Typical specs at 25 °C
Parameter
Symbol
Test Conditions
Min
DC Specifications
Input-Side Power Supply
Voltage
Driver Supply Voltage
VDDI
Voltage between VDDA and
VDDA, VDDB GNDA, and VDDB and GNDB
(See “6. Ordering Guide” )
4.5
6.5
Input Supply Quiescent
Current
Output Supply Quiescent
Current
Input Supply Active Current
Output Supply Active Current
Input Pin Leakage Current
Input Pin Leakage Current
Logic High Input Threshold
Logic Low Input Threshold
Input Hysteresis
Logic High Output Voltage
IDDI(Q)
IDDA(Q),
IDDB(Q)
IDDI
IDDO
IPWM
IDISABLE
VIH
VIL
VIHYST
VOAH,
VOBH
Si8241/44
Current per channel
PWM freq = 500 kHz
PWM freq = 500 kHz
IOA, IOB = –1 mA
—
—
—
—
–10
–10
2.0
—
400
(VDDA
/VDDB)
— 0.04
Logic Low Output Voltage
Output Short-Circuit Pulsed
Sink Current
VOAL, VOBL
IOA(SCL),
IOB(SCL)
IOA, IOB = 1 mA
Si8241, Figure 2
Si8244, Figure 2
—
—
—
Output Short-Circuit Pulsed
Source Current
IOA(SCH),
IOB(SCH)
Si8241, Figure 3
Si8244, Figure 3
—
—
Output Sink Resistance
RON(SINK)
Si8241
Si8244
—
—
Output Source Resistance
RON(SOURCE)
Si8241
Si8244
—
—
Notes:
1. VDDA = VDDB = 12 V for 8 V UVLO and 10 V UVLO devices.
2. The largest RDT resistor that can be used is 220 k.
Typ
—
—
2
—
2.5
3.6
—
—
—
—
450
—
—
0.5
4.0
0.25
2.0
5.0
1.0
15
2.7
Max Units
5.5 V
24 V
3 mA
3.0 mA
— mA
— mA
+10 µA dc
+10 µA dc
—V
0.8 V
— mV
—V
0.04 V
—A
—A
—A
—A
—
—
—
—
Rev. 0.2
5
Free Datasheet http://www.datasheet4u.com/
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| Information | Total 30 Pages | |
| Link URL | [ Copy URL to Clipboard ] | |
| Download | [ SI824X.PDF Datasheet ] | |
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