IRS20955S

Product Summary

The IRS20955S 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 of the IRS20955S provides a secure protection sequence against overcurrent 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.

Parametrics

IRS20955S absolute maximum ratings: (1)VB, High-side floating supply voltage: -0.3 to 220V; (2)VS, High-side floating supply voltage (Note1): VB-20 to VB+0.3V; (3)VHO, High-side floating output voltage: Vs-0.3 to VB+0.3V; (4)VCSH, CSH pin input voltage: Vs-0.3 to VB+0.3V; (5)VCC, Low-side fixed supply voltage (Note1): -0.3 to 20V; (6)VLO, Low-side output voltage: -0.3 to VCC +0.3V; (7)VDD, Floating input supply voltage: -0.3 to 210V; (8)VSS, Floating input supply voltage (Note1) (See IDDZ): VDD+0.3V; (9)VIN, PWM input voltage: VSS -0.3 VDD+0.3V; (10)VCSD, CSD pin input voltage: VSS -0.3 VDD+0.3V; (11)VDT, DT pin input voltage: -0.3 VCC +0.3V; (12)VOCSET, OCSET pin input voltage: -0.3 to VCC +0.3V; (13)VREF, VREF pin voltage: -0.3 to VCC +0.3V; (14)IDDZ, Floating input supply Zener clamp current (Note1): 10mA; (15)ICCZ, Low side supply Zener clamp current (Note1): 10mA; (16)IBSZ, Floating supply Zener clamp current (Note1): 10mA; (17)IOREF, Reference output current: 5mA; (18)d VS /dt, Allowable VS voltage slew rate: 50V/ns; (19)d VSS /dt, Allowable VSS voltage slew rate (Note2): 50V/ns; (20)d VSS /dt, Allowable VSS voltage slew rate upon power-up (Note3): 50V/ns; (21)PD, Maximum power dissipation: 1.0 W; (22)Rth,JA, Thermal resistance, junction to ambient: 115℃/W; (23)TJ, Junction temperature: 150℃; (24)TS, Storage temperature: -55 to 150℃; (25)TL, Lead temperature (soldering, 10 seconds): 300℃.

Features

IRS20955S features: (1)Floating PWM input enables easy half-bridge implementation; (2)Programmable bidirectional over-current protection with self-reset function; (3)Programmable preset deadtime for improved THD performances; (4)High noise immunity; (5)±100 V ratings deliver up to 500 W in output power; (6)3.3 V/5 V logic compatible input; (7)Operates up to 800 kHz; (8)RoHS compliant.

Diagrams