IRS20955STRPBF Datasheet IRS20955STRPBF, IRS20955SPBF | P1-P3

IRS20955(S)PbF

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IRS20955(S)PbF

PROTECTED DIGITAL AUDIO DRIVER

Features

• Floating PWM input enables easy half-bridge

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

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.

Product Summary

V

OFFSET

(max)

± 100 V

I

o+

1.0 A

Gate driver

I

o-

1.2 A

Selectable deadtime

15 ns, 25 ns,

35 ns, 45ns

Propagation delay 90 ns

OC protection delay 500 ns (max)

Shutdown propagation

delay

250 ns (max)

Package

Typical Connection

(Please refer to Lead

Assignments for correct

pin configuration. This

diagram shows

electrical connections

only)

IRS20955 (S)

12V

VDD

IN

CSD

VSS

COM

OCSET

LO

VCC

HO

VS

DT

CSH

VB

-B

Vcc

Speaker

+B

PWM

VREF

NC

Data Sheet No. PD60303

Not recommended for new design

Please refer to IRS20957

IRS20955(S)PbF

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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 Definition Min. Max. Units

V

B

High-side floating supply voltage -0.3 220

V

S

High-side floating supply voltage (Note1) V

B

-20

V

B

+0.3

V

HO

High-side floating output voltage Vs-0.3 V

B

+0.3

V

CSH

CSH pin input voltage Vs-0.3 V

B

+0.3

V

CC

Low-side fixed supply voltage (Note1) -0.3 20

V

LO

Low-side output voltage -0.3 V

CC

+0.3

V

DD

Floating input supply voltage -0.3 210

V

SS

Floating input supply voltage (Note1) (See I

DDZ

)

V

DD

+0.3

V

IN

PWM input voltage V

SS

-0.3

V

DD

+0.3

V

CSD

CSD pin input voltage V

SS

-0.3

V

DD

+0.3

V

DT

DT pin input voltage

-0.3 V

CC

+0.3

V

OCSET

pin input voltage

-0.3 V

CC

+0.3

V

REF

VREF pin voltage

-0.3 V

CC

+0.3

V

I

DDZ

Floating input supply Zener clamp current (Note1) -

10

I

CCZ

Low side supply Zener clamp current (Note1) - 10

I

BSZ

Floating supply Zener clamp current (Note1) - 10

I

OREF

Reference output current - 5

mA

d V

S

/dt Allowable V

S

voltage slew rate -

50

d V

SS

/dt Allowable V

SS

voltage slew rate (Note2) - 50

V/ns

d V

SS

/dt Allowable V

SS

voltage slew rate upon power-up (Note3) - 50 V/ms

P

D

Maximum power dissipation - 1.0 W

R

th,JA

Thermal resistance, junction to ambient - 115

°C/W

T

J

Junction temperature - 150

T

S

Storage temperature -55 150

T

L

Lead temperature (soldering, 10 seconds) - 300

°C

Note1: 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.

Note2: For the rising and falling edges of step signal of 10 V. V

ss

=15 V to 200 V.

Note3: V

ss

ramps up from 0 V to 200 V.

IRS20955(S)PbF

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Recommended Operating Conditions

For proper operation, the device should be used within the recommended conditions below. All voltage parameters are

absolute voltages referenced to COM. The V

S

and COM offset ratings are tested with supplies biased at I

DD

=5 mA, V

CC

=12

V and V

B

-V

S

=12 V.

Symbol Definition Min. Max. Units

V

B

High-side floating supply absolute voltage V

S

+10 V

S

+18

V

S

High-side floating supply offset voltage Note 1 100

V

I

DDZ

Floating input supply zener clamp current 1 5 mA

V

SS

Floating input supply absolute voltage 0 200

V

HO

High-side floating output voltage Vs V

B

V

CC

Low-side fixed supply voltage 10 18

V

LO

Low-side output voltage 0 V

CC

V

IN

PWM input voltage

V

CSD

CSD pin input voltage

V

SS

V

DD

V

DT

DT pin input voltage 0 V

CC

V

I

OREF

Reference output current to COM (Note 2) 0.3 0.8 mA

V

OCSET

pin input voltage 0.5 5 V

T

A

Ambient temperature -40 125

°C

I

PW

Input pulse width 10 (note 3) - ns

Note 1: Logic operational for V

S

equal to –5 V to +200 V. Logic state held for V

S

equal to –5 V to –V

BS

.

Note 2: Nominal voltage for V

REF

is 5 V. I

OREF

of 0.3 mA – 0.8 mA dictates total external resistor value on V

REF

to be 6.3 kΩ

to 16.7 kΩ.

Note 3: Output logic status may not respond correctly if input pulse width is smaller than the minimum pulse width

IRS20955STRPBF

IRS20955STRPBF

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