Datenblatt-pdf.com


IRS20955PBF Schematic ( PDF Datasheet ) - International Rectifier

Teilenummer IRS20955PBF
Beschreibung PROTECTED DIGITAL AUDIO DRIVER
Hersteller International Rectifier
Logo International Rectifier Logo 




Gesamt 21 Seiten
IRS20955PBF Datasheet, Funktion
PRELIMINARY
Data Sheet No. PD60303
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
Product Summary
VOFFSET (max)
Gate driver
Io+
Io-
Selectable deadtime
Propagation delay
OC protection delay
Shutdown propagation
delay
± 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.
Package
Bi-directional current sensing detects over-current www.DataSheet4U.com
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.
16-Lead PDIP
16-Lead SOIC
Typical Connection
PWM
(Please refer to Lead
Assignments for correct
pin configuration. This
diagram shows
electrical connections
only)
www.irf.com
IRS20955 (S)
VDD
CSD
IN
VSS
NC
VREF
OCSET
DT
CSH
VB
HO
VS
NC
VCC
LO
COM
+B
Speaker
Vcc
12V
-B
1






IRS20955PBF Datasheet, Funktion
Lead Definitions
Pin #
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Symbol
VDD
CSD
IN
VSS
NC
VREF
OCSET
DT
COM
LO
VCC
NC
VS
HO
VB
CSH
IRS20955(S)PbF
PRELIMINARY
Description
Floating input positive supply
Shutdown timing capacitor, referenced to VSS
PWM non-inverting input, in phase with HO
Floating input supply return
5 V reference output for setting OCSET
Low-side over current threshold setting, referenced to COM
Input for programmable deadtime, referenced to COM
Low-side supply return
Low-side output
Low-side logic supply
High-side floating supply return
High-side output
High-side floating supply
High-side over current sensing input, referenced to VS
VDD 1
CSD 2
IN 3
VSS 4
NC 5
VREF 6
OCSET 7
DT 8
16 CSH
15 VB
14 HO
13 VS
12 NC
11 VCC
10 LO
9 COM
IRS20955(S)
16-Lead SOIC (narrow body)
16-Lead PDIP
www.irf.com
6

6 Page









IRS20955PBF pdf, datenblatt
UV
DETECT
HIGH
SIDE
CS
UV
Q
CSH
VB
HO
R2 D1
R1
R3
Cbs
Dbs
HV
LEVEL
SHIFT
FLOATING HIGH SIDE
5V REG
HV
LEVEL
SHIFT
UV
DETECT
VS
VCC
DEAD TIME
SD
LO
LOW SIDE CS
COM
OCSET
VREF
R5
R4
IRS20955(S)PbF
PRELIMINARY
+B
Q1
OUT
Vcc
Q2
-B
Figure 12. Bi-directional Over Current Protection
Low-side Over Current Sensing
For negative load currents, low-side over current
sensing monitors the load condition and shuts down
switching operation if the load current exceeds the
preset trip level.
Low-side current sensing is based on the
measurement of VDS across the low side MOFET
during low-side turn on. In order to avoid triggering
OCP from overshoot, a blanking interval inserted
after LO turn on disables over current detection for
450 ns.
The OCSET pin is used to program the threshold for
low-side over current sensing. When the VDS
measured across the low-side MOSFET exceeds
the voltage at the OCSET pin with respect COM, the
IRS20955S begins the OCP sequence described
earlier.
Since the voltage from VS to COM is compared to
the voltage at the OCSET pin, the voltage at OCSET
determines the trip level for over-current detection.
By selecting the trip level for over-current, the
voltage at OCSET can be calculated using the
equation below.
VOCSET = VDS(LOW SIDE) = ITRIP+ x RDS(ON)
In order to minimize the effect of the input bias
current at the OCSET pin, select resistor values for
R4 and R5 such that the current through the voltage
divider is 0.5 mA or more.
* Note: Using VREF to generate an input to OCSET
through a resistive divider provides improved
immunity from fluctuations in VCC.
www.irf.com
12

12 Page





SeitenGesamt 21 Seiten
PDF Download[ IRS20955PBF Schematic.PDF ]

Link teilen




Besondere Datenblatt

TeilenummerBeschreibungHersteller
IRS20955PBFPROTECTED DIGITAL AUDIO DRIVERInternational Rectifier
International Rectifier

TeilenummerBeschreibungHersteller
CD40175BC

Hex D-Type Flip-Flop / Quad D-Type Flip-Flop.

Fairchild Semiconductor
Fairchild Semiconductor
KTD1146

EPITAXIAL PLANAR NPN TRANSISTOR.

KEC
KEC


www.Datenblatt-PDF.com       |      2020       |      Kontakt     |      Suche