IR2112S Driver: Introduction, Pinout and Applications

IR2112S Introduction

The IR2112S is a high-speed, high-voltage driver designed for power MOSFETs and IGBTs, featuring independent high and low side output channels. Its rugged monolithic construction is made possible by proprietary HVIC and latch-immune CMOS technologies, ensuring reliability in demanding applications. 

The driver is compatible with standard CMOS or LSTTL logic inputs, including 3.3V logic, and incorporates a high pulse current buffer stage to minimize cross-conduction. With matched propagation delays, the IR2112S is ideal for high-frequency applications, and its floating channel supports driving N-channel MOSFETs or IGBTs on the high side, with a maximum voltage rating of 600V.

IR2112S Pinout 

VDD: Logic supply 

HIN: Logic input for high side gate driver output (HO), in phase 

SD: Logic input for shutdown 

LIN: Logic input for low side gate driver output (LO), in phase 

VSS: Logic ground 

VB: High side floating supply 

HO: High side gate drive output 

VS: High side floating supply return 

VCC: Low side supply 

LO: Low side gate drive output 

COM: Low side return

IR2112S Symbol

IR2112S Footprint 

IR2112S 3D Model

IR2112S Typical Connection

IR2112S Functional Block Diagram

IR2112S Specification

Specification	Value
Device Type	IGBT, N-Channel MOSFET
Number of Drivers	2
Supply Voltage	10V ~ 20V
Logic Voltage - VIL, VIH	6V, 9.5V
Peak Output Current	250mA, 500mA
Pulse Current Buffer Stage	Designed for minimal cross-conduction
Propagation Delay	Matched delays for high-frequency applications
Floating Channel	Can drive N-channel MOSFETs or IGBTs in high-side configuration
High Side Output Voltage	600 V
Rise / Fall Time	80ns, 40ns
Operating Temperature	-40°C ~ 150°C
Package	16-SOIC

IR2112S Features

Floating channel designed for bootstrap operation

Fully operational to +600V

Tolerant to negative transient voltage dV/dt immune

Gate drive supply ranges from 10 to 20V

Undervoltage lockout for both channels

3.3V logic compatible 

Separate logic supply range from 3.3V to 20V 

Logic and power ground ±5V offset

CMOS Schmitt - triggered inputs with pull-down

Cycle by cycle edge-triggered shutdown logic

Matched propagation delay for both channels

Outputs in phase with inputs

IR2112S Applications

Motor Drives

DC-AC Inverters

Switching Power Supplies

Induction Heating

Lighting Control Systems

Power Conversion Systems

Electric Vehicles (EVs)

Hybrid Electric Vehicles (HEVs)

IR2112S Package

The IR2112S comes in a 16-SOIC package, offering a compact and efficient solution for high-speed power MOSFET and IGBT driving applications. The package dimensions are 10.3mm x 5.3mm x 1.75mm (length x width x height), with a standard lead pitch of 1.27mm. This surface-mount package is designed to provide excellent thermal and electrical performance while saving space on PCBs, making it ideal for high-performance industrial and motor control systems.

How to Use IR2112S?

1. First, connect the VDD pin to the appropriate logic power supply and ground the VSS pin. Next, provide low-side power to VCC and COM, usually at the same voltage as VDD, ensuring a stable ground reference for both VSS and COM.

2. Input the appropriate logic signals to HIN and LIN, which determine the operation of the high-side and low-side switches. Ensure the signal levels on HIN and LIN are correct. Using these pins, you can control the switching of HO and LO outputs.

3. Use the SD pin to enable or disable the functionality. To shut down the system, pull the SD pin low, which disables both high-side and low-side outputs, ensuring a safe system stop. Conversely, pulling the SD pin high will restore the drive functionality.

4. Connect the high-side devices through VS and VB pins. These pins support driving high-side MOSFETs or IGBTs while maintaining isolation from the low-side power. You can monitor the high-side output through the HO pin, while the LO pin is used to control the switching of the low-side device.

FAQs

How do I prevent cross-conduction in the IR2112S? 

The IR2112S features a high-pulse current buffer stage designed to minimize cross-conduction between the high-side and low-side drivers, ensuring efficient and safe operation, especially in high-speed applications.

What are the typical applications of the IR2112S? 

The IR2112S is commonly used in motor drives, switching power supplies, DC-AC inverters, and other high-voltage applications that require efficient and reliable gate driving for power MOSFETs or IGBTs.

What logic levels are compatible with the IR2112S inputs? 

The IR2112S logic inputs (HIN, LIN, SD) are compatible with 3.3V logic or LSTTL levels, which ensures compatibility with modern microcontrollers or other logic circuits.