Sept 19, 2016
Datasheet No – PD
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
Product Summary
Topology
V
OFFSET (max)
I
O+
& I
O-
(typical)
Selectable deadtime
Ton & toff (typical)
OC protection delay
Shutdown
propagation delay
Half-Bridge
+/- 100 V
1.0 A & 1.2 A
15/25/35/80ns
95ns & 80ns
500ns (max)
250ns (max)
Typical Applications
Home theatre systems
Mini component stereo systems
Powered speaker systems
General purpose audio power amplifiers
Package
Typical Connection Diagram
IRS20957S
1
2
3
+B
16
15
14
13
12
11
10
9
VDD
CSD
IN
VSS
NC
VREF
OCSET
DT
CSH
VB
HO
VS
NC
VCC
LO
COM
PWM
4
5
6
7
8
Speaker
Vcc
12V
-B
Note: Please refer to Lead Assignments for correct pin configuration. This diagram shows
electrical connections only.
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© 2008 International Rectifier
1
IRS20957S
Table of Contents
Description
Qualification Information
Absolute Maximum Ratings
Recommended Operating Conditions
Electrical Characteristics
Functional Block Diagram
Input/Output Pin Equivalent Circuit Diagram
Lead Definitions
Lead Assignments
Waveform definitions
Application information and additional information
Package Details
Tape and Reel Details
Part Marking Information
Ordering Information
Page
3
4
5
6
7
9
10
11
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www.irf.com
© 2008 International Rectifier
2
IRS20957S
Description
The IRS20957S is a high voltage, high speed MOSFET driver with a floating PWM input designed for Class
D audio amplifier applications.
Bi-directional current sensing detects over current conditions during positive and negative load currents
without any external shunt resistors. A built-in protection control block provides a secure protection
sequence against over-current conditions and a programmable reset timer.
The internal dead-time generation block enables accurate gate switching and optimum dead-time setting
for better audio performance, such as lower THD and lower audio noise floor.
www.irf.com
© 2008 International Rectifier
3
IRS20957S
Qualification Information
Qualification Level
†
Moisture Sensitivity Level
Machine Model
ESD
Human Body Model
IC Latch-Up Test
RoHS Compliant
Industrial
Comments: This family of ICs has passed JEDEC’s
Industrial qualification. IR’s Consumer qualification level is
granted by extension of the higher Industrial level.
†††
MSL2 260°C
SOIC16N
(per IPC/JEDEC J-STD-020)
Class B
(per JEDEC standard EIA/JESD22-A115)
Class 2
(per EIA/JEDEC standard JESD22-A114)
Class I , Level A
(per JESD78)
Yes
††
†
Qualification standards can be found at International Rectifier’s web site
http://www.irf.com/
†† Higher qualification ratings may be available should the user have such requirements. Please
contact your International Rectifier sales representative for further information.
††† Higher MSL ratings may be available for the specific package types listed here. Please contact
your International Rectifier sales representative for further information.
www.irf.com
© 2008 International Rectifier
4
IRS20957S
Absolute Maximum Ratings
Absolute Maximum Ratings indicate sustained limits beyond which damage to the device may occur. All
voltage parameters are absolute voltages referenced to COM; all currents are defined positive into any
lead. The Thermal Resistance and Power Dissipation ratings are measured under board mounted and still
air conditions.
Symbol
V
B
V
S
V
HO
V
CSH
V
CC
V
LO
V
DD
V
SS
V
IN
V
CSD
V
DT
V
OCSET
V
REF
I
DDZ
I
CCZ
I
BSZ
I
OREF
d V
S
/dt
d V
SS
/dt
d V
SS
/dt
Pd
Rth
JA
T
J
T
S
T
L
†
††
†††
Definition
High side floating supply voltage
High side floating supply voltage
High side floating output voltage
CSH pin input voltage
Low side fixed supply voltage
Low side output voltage
Floating input supply voltage
Floating input supply voltage
PWM input voltage
CSD pin input voltage
DT pin input voltage
OCSET pin input voltage
VREF pin voltage
Floating input supply zener clamp current
Low side supply zener clamp current
Floating supply zener clamp current
Reference output current
Allowable V
S
voltage slew rate
Allowable V
SS
voltage slew rate
††
†††
†
†
†
†
†
†
Min.
-0.3
V
B
-15
Vs-0.3
Vs-0.3
-0.3
-0.3
-0.3
(See I
DDZ
)
V
SS
-0.3
V
SS
-0.3
-0.3
-0.3
-0.3
-
-
-
-
-
-
-
-
-
-
-55
-
Max.
215
V
B
+0.3
V
B
+0.3
V
B
+0.3
20
V
CC
+0.3
210
V
DD
+0.3
V
DD
+0.3
V
DD
+0.3
V
CC
+0.3
V
CC
+0.3
V
CC
+0.3
10
10
10
5
50
50
50
1.0
115
150
150
300
Units
V
mA
V/ns
V/ms
W
C/W
C
Allowable V
SS
voltage slew rate upon power-up
Maximum power dissipation
Thermal resistance, Junction to ambient
Junction Temperature
Storage Temperature
Lead temperature (Soldering, 10 seconds)
V
DD
- V
SS
, V
CC
-COM and V
B
- V
S
contain internal shunt zener diodes. Please note that the
voltage ratings of these can be limited by the clamping current.
For the rising and falling edges of step signal of 10V. Vss=15V to 200V.
Vss ramps up from 0V to 200V.
www.irf.com
© 2008 International Rectifier
5
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