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IRS20955(S)PbF
Not recommended for new design
Please refer to IRS20957
Data Sheet No. PD60303
IRS20955(S)PbF
PROTECTED DIGITAL AUDIO DRIVER
Features
? Floating PWM input enables easy half-bridge
Product Summary
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implementation
Programmable bidirectional over-current protection
with self-reset function
Programmable preset deadtime for improved THD
performances
High noise immunity
± 100 V ratings deliver up to 500 W in output power
3.3 V/5 V logic compatible input
Operates up to 800 kHz
RoHS compliant
V OFFSET (max)
Gate driver
Selectable deadtime
Propagation delay
OC protection delay
Shutdown propagation
delay
I o+
I o-
± 100 V
1.0 A
1.2 A
15 ns, 25 ns,
35 ns, 45ns
90 ns
500 ns (max)
250 ns (max)
Description
The IRS20955 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 deadtime generation block enables accurate
gate switching and optimum deadtime setting for better
audio performance, such as lower THD and lower audio
noise floor.
Typical Connection
IRS20955 (S)
Package
+B
VDD
CSD
IN
CSH
VB
HO
(Please refer to Lead
Assignments for correct
pin configuration. This
diagram shows
PWM
VSS
NC
VREF
OCSET
DT
VS
NC
VCC
LO
COM
Vcc
12V
Speaker
electrical connections
only)
www.irf.com
-B
1
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