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IRS20957S Schematic ( PDF Datasheet ) - International Rectifier

Teilenummer IRS20957S
Beschreibung Protected Digital Audio Driver
Hersteller International Rectifier
Logo International Rectifier Logo 




Gesamt 16 Seiten
IRS20957S Datasheet, Funktion
March 5, 2009
Datasheet No – PD97381
IRS20957S
Protected Digital Audio Driver
Features
Floating PWM input enables easy half bridge
implementation
Programmable bidirectional over-current protection with
self-reset function
Programmable preset dead-time for improved THD
performances
High noise immunity
• ±100V ratings deliver up to 500W in output power
3.3 V/ 5 V logic compatible input
Operates up to 800kHz
Typical Applications
Home theatre systems
Mini component stereo systems
P owered speaker systems
General purpose audio power amplifiers
Product Summary
Topology Half-Bri
VOFFSET (max)
IO+ & IO- (typical)
Selectable deadtime
Ton & toff (typical)
OC protection delay
Shutdown
propagation delay
Package
dge
+/- 100 V
1.0 A & 1.2 A
15/25/35/80ns
95ns & 80ns
500ns (max)
250ns (max)
Typical Connection Diagram
Note: Pleas e refer to Lead Ass ignments for correct pin config uration. T his diagram sh ows
electrical connections only.
www.irf.com
© 2008 International Rectifier
1
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IRS20957S Datasheet, Funktion
IRS20957S
Recommended Operating Conditions
For proper operation, the device should be used within the recommended conditions below. The Vs and
COM offset ratings are tested with supplies biased at IDD=5mA, VCC=12V and VB-VS=12V.
Symbol Defini
tion
VB High side floating supply absolute voltage
VS High side floating supply offset voltage
IDDZ Floating input supply zener clamp current
VSS Floating input supply absolute voltage
VHO High side floating output voltage
VCC Low side fixed supply voltage
VLO Low side output voltage
VIN PWM input voltage
VCSD CSD pin input voltage
VDT
IOREF
DT pin input voltage
Reference output current to COM
VOCSET OCSET pin input voltage
TA Ambient Temperature
Min.
Vs+10
1
0
Vs
10
0
VSS
VSS
0
0.3 0.8
0.5
-40
Max.
Vs+14
200
5
100
VB
15
VCC
VDD
VDD
VCC
5
125
Units
V
mA
V
mA
V
°C
† Logic operational for Vs equal to –5V to +200V. Logic state held for Vs equal to –5V to –VBS.
†† Nominal voltage for V REF is 5V. IOREF of 0.3 – 0.8mA dictates total external resi stor value on
VREF to be 6.3k to 16.7k .
www.irf.com
© 2008 International Rectifier
6

6 Page









IRS20957S pdf, datenblatt
Waveform definitions
IRS20957S
Vth1
CSD
HO/LO
90%
tSD
Figure 1: Switching Time Waveform Definitions
Figure 2: CSD to Shutdown Waveform Definitions
VS VthOCL
90%
LO
tOCL
Figure 3: VS > VthOCL to Shutdown Waveform
CSH
VS
HO
VthOCH
90%
tOCH
Figure 4: VCSH > VthOCH to Shutdown Waveform
Application information and additional information
Please refer to AN-1144 for IRS20957 functional description.
www.irf.com
© 2008 International Rectifier
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