IR2110 Working Principle and Circuit Design

The IR2110 is a high-voltage MOSFET and IGBT driver IC used to control power switches in demanding electronic circuits. It is designed with separate high-side and low-side driver outputs, allowing it to drive two switching devices in circuits such as half-bridge and full-bridge designs. This article will talk about the IR2110's features and specifications, pin configuration, internal architecture, typical application circuits, practical design considerations, comparison with similar driver ICs, selection factors, and popular alternatives.

Catalog

What is IR2110 MOSFET/IGBT Driver IC?

The IR2110 is a high-voltage, high-speed gate driver IC designed to control power MOSFETs and IGBTs. It has independent high-side and low-side output channels, allowing it to drive switching devices with accurate and reliable gate control.

The IR2110 uses rugged CMOS technology, supports standard CMOS and LSTTL logic inputs, and includes a high-pulse-current buffer stage to improve switching performance. Its floating high-side channel can operate up to 500 V, making it suitable for demanding high-voltage circuit designs.

If you are interested in purchasing the IR2110, feel free to contact us for pricing and availability.

Features & Specifications of IR2110

Parameter	Specification
Driver Type	High-Voltage, High-Speed MOSFET and IGBT Driver
Number of Channels	Independent High-Side and Low-Side Drivers
Floating Channel Voltage	Up to 500 V
Process Technology	HVIC and Latch-Immune CMOS
Logic Input Type	CMOS and LSTTL Compatible
Floating Channel Design	Designed for Bootstrap Operation
Gate Drive Supply Range (VCC)	10 V to 20 V
VDD Range	5 V to 20 V
Peak Output Current (Source)	2 A Typical
Peak Output Current (Sink)	2 A Typical
Undervoltage Lockout (UVLO)	Available on Both Channels
dV/dt Immunity	High Noise Immunity
Negative Transient Voltage	Tolerant
Input Type	CMOS Schmitt Trigger with Pull-Down
Shutdown Function	Cycle-by-Cycle Edge-Triggered Shutdown Logic
Delay Matching	Matched Propagation Delay Between Channels
Output Relationship	Outputs in Phase with Inputs
Logic and Power Ground Offset	±5 V
High-Speed Operation	Optimized for Fast Switching Applications
Available Packages	14-Pin DIP, 16-Pin SOIC

IR2110 Pin Configuration and Pin Functions

Pin No.	Pin Name	Type	Function
1	LO	Output	Low-side gate driver output. Provides the gate drive signal for the low-side MOSFET or IGBT.
2	COM	Ground	Low-side return path and power ground reference for the driver output stage.
3	VCC	Power Supply	Supply voltage for the low-side gate driver output stage. Typically 10 V to 20 V.
4	NC	No Connection	Internal connection not used. Leave unconnected unless specified by the manufacturer.
5	VS	Floating Return	Return reference for the high-side driver. Connected to the source of the high-side MOSFET or emitter of the high-side IGBT.
6	VB	Floating Supply	Floating power supply input for the high-side driver. Usually connected to a bootstrap capacitor.
7	HO	Output	High-side gate driver output. Drives the gate of the high-side MOSFET or IGBT.
8	VDD	Logic Supply	Logic circuit supply voltage. Supports logic input stages and internal control circuitry.
9	HIN	Input	Logic input controlling the high-side output (HO). A high input turns on the high-side driver.
10	SD	Input	Shutdown control input. Used to disable both driver outputs for fault protection or system control.
11	LIN	Input	Logic input controlling the low-side output (LO). A high input turns on the low-side driver.
12	VSS	Logic Ground	Ground reference for the logic supply and control inputs.
13	NC	No Connection	Internal connection not used. Leave unconnected unless specified by the manufacturer.
14	NC	No Connection	Internal connection not used. Leave unconnected unless specified by the manufacturer.

Internal Block Diagram & Architecture of IR2110

The IR2110 contains separate high-side and low-side gate-driver sections designed to control power MOSFETs or IGBTs in switching applications. Inside the device, the input signals pass through Schmitt-trigger circuits that improve noise immunity and ensure reliable operation in electrically noisy environments. Internal logic circuits process the control signals and manage the operation of both driver channels.

A key part of the architecture is the high-voltage level-shifting circuit. This block transfers control information from the low-voltage logic section to the floating high-side driver section, allowing the device to operate in applications where the switching node moves over a wide voltage range. The floating driver is powered through the VB and VS terminals, enabling proper gate control of the upper switching device.

The IR2110 also incorporates several protection and timing functions. Undervoltage lockout (UVLO) continuously monitors the driver supply voltages and disables the outputs if the voltage falls below a safe operating level. Pulse filtering helps reject unwanted noise pulses, while the shutdown function provides a convenient method for disabling both driver channels during fault conditions or system protection events.

Typical IR2110 Application Circuits

The IR2110 is widely used in half-bridge, full-bridge, and high-power switching circuits. A common application consists of two N-channel MOSFETs connected in a half-bridge arrangement, allowing efficient control of power delivered to a load. This configuration is frequently found in motor drives, DC-AC inverters, switch-mode power supplies, UPS systems, and induction heating equipment.

A bootstrap diode and capacitor are typically used to generate the floating supply required by the high-side driver. During operation, the capacitor stores energy and provides the voltage needed to turn on the upper MOSFET. This approach eliminates the need for a separate isolated power source for the high-side gate driver, reducing circuit complexity and cost.

Additional external components are commonly included to improve performance. Gate resistors help control switching speed and reduce voltage ringing, while pull-down resistors ensure the power transistors remain in a defined off-state when no control signal is present. These components contribute to stable and reliable switching operation.

How to Use the IR2110 in Practical Designs

Successful IR2110 designs begin with proper PCB layout and power-supply decoupling. Bypass capacitors should be placed close to the VCC-COM and VDD-VSS pins to reduce voltage dips during fast switching. Gate-drive traces should be short and direct to minimize parasitic inductance, while high-voltage and low-voltage sections should have proper spacing for safety and signal stability.

Gate resistor selection is also important because it controls the MOSFET or IGBT switching speed. A smaller gate resistor gives faster switching but may increase ringing and electromagnetic interference. A larger gate resistor slows the switching edge and can reduce noise, but it may increase switching losses.

The circuit must include proper dead-time control between the high-side and low-side devices. This prevents both switches from turning on at the same time, which can cause shoot-through current and damage the power stage.

For better reliability, you should apply noise reduction techniques such as short ground paths, solid COM connection, proper decoupling, and careful routing of HIN and LIN signals away from noisy switching nodes. Protection recommendations include using undervoltage lockout properly, adding suitable gate resistors, checking bootstrap capacitor size, and protecting the MOSFETs or IGBTs from overcurrent, overvoltage, and overheating.

IR2110 vs IR2101 vs IR2104

Feature	IR2110	IR2101	IR2104
Driver Type	High-Side and Low-Side Driver	High-Side and Low-Side Driver	High-Side and Low-Side Driver with Internal Dead Time
High-Side Floating Supply Voltage	Up to 500 V	Up to 600 V	Up to 600 V
Output Channels	Independent High-Side and Low-Side Outputs	Independent High-Side and Low-Side Outputs	Complementary High-Side and Low-Side Outputs
Peak Output Current (Source)	2 A	130 mA	210 mA
Peak Output Current (Sink)	2 A	270 mA	360 mA
Logic Supply Voltage (VDD)	5 V to 20 V	Not Required	Not Required
Driver Supply Voltage (VCC)	10 V to 20 V	10 V to 20 V	10 V to 20 V
Logic Input Pins	HIN, LIN, SD	HIN, LIN	IN, SD
Shutdown Pin	Yes	No	Yes
Undervoltage Lockout (UVLO)	High-Side and Low-Side	High-Side and Low-Side	High-Side and Low-Side
Level Shifter	Yes	Yes	Yes
Bootstrap Operation	Yes	Yes	Yes
Matched Propagation Delay	Yes	No	No
Internal Dead Time	No	No	Yes
Dead-Time Control	External	External	Internal
Independent Control of Both Outputs	Yes	Yes	No
Output Logic Configuration	Independent	Independent	Complementary
Noise Immunity	High	High	High
MOSFET Compatibility	N-Channel MOSFETs	N-Channel MOSFETs	N-Channel MOSFETs
IGBT Compatibility	Yes	Limited Drive Capability	Limited Drive Capability
Switching Frequency Capability	High	Moderate	Moderate
Gate Drive Strength	High	Low	Medium
External Components Required	Moderate	Low	Low
Design Complexity	Moderate	Simple	Very Simple
Package Options	DIP, SOIC	DIP, SOIC	DIP, SOIC

Factors to Consider Before Choosing the IR2110

Switching Frequency Requirements

The IR2110 is designed for high-speed switching and can be used in applications such as inverters, motor drives, and switch-mode power supplies. Before selecting the device, you should evaluate the intended switching frequency and ensure that the MOSFETs or IGBTs can be driven efficiently at that speed. Higher switching frequencies may improve system performance and reduce the size of magnetic components, but they also increase switching losses and heat generation.

MOSFET or IGBT Selection

The IR2110 can drive both N-channel MOSFETs and IGBTs, but the gate-drive requirements of these devices can differ significantly. MOSFETs are generally preferred for high-frequency operation because of their faster switching speed, while IGBTs are often used in higher-voltage and higher-current applications. The selected power device should be compatible with the IR2110's gate-drive voltage and output current capability.

Input Logic Compatibility

The IR2110 supports standard CMOS and LSTTL logic levels, making it compatible with many microcontrollers, DSPs, and PWM controllers. You should verify that the logic output voltage of the control circuit meets the input requirements of the driver to ensure reliable switching and proper signal recognition.

Power Supply Requirements

Proper supply voltages are essential for reliable operation. The IR2110 typically requires a gate-drive supply voltage between 10 V and 20 V, while the high-side driver uses a bootstrap circuit to generate its floating supply. Adequate bypass capacitors and a correctly sized bootstrap capacitor should be included to maintain stable operation during switching.

Isolation Requirements

The IR2110 uses a level-shifting architecture rather than galvanic isolation. For many half-bridge and full-bridge designs, this approach is sufficient and helps reduce circuit complexity. However, applications that require safety isolation, high common-mode noise immunity, or isolated control systems may require an isolated gate driver instead of the IR2110. Evaluating isolation requirements early in the design process helps ensure compliance with system safety and performance requirements.

Popular Alternatives of IR2110

• IR2113

• IRS2110

• IRS2113

• IR2101

• IR2104

• IRS2184

• FAN7392

• UCC27714

Mechanical Dimensions of IR2110

Conclusion

The IR2110 from Infineon Technologies combines high-side and low-side gate driving, strong output current capability, bootstrap operation, and useful protection features in a single IC. These features help simplify power circuit design while providing reliable control of MOSFETs and IGBTs in high-voltage switching applications. With its independent driver channels, level-shifting architecture, and support for high-speed switching, the IR2110 remains a popular choice for engineers designing inverters, motor drives, power supplies, and other power electronic systems.

Frequently Asked Questions [FAQ]

1. How do you calculate the bootstrap capacitor value for an IR2110 circuit?

The bootstrap capacitor should store enough charge to keep the high-side MOSFET fully enhanced during the entire switching cycle. The value depends on the MOSFET gate charge, switching frequency, leakage currents, and desired voltage margin.

2. Can the IR2110 drive multiple MOSFETs in parallel?

Yes. The IR2110 can drive multiple MOSFETs connected in parallel, provided the total gate charge remains within the driver's capability and proper gate resistors are used for each MOSFET.

3. Why does the high-side MOSFET fail to turn on in some IR2110 designs?

A common cause is an improperly charged bootstrap capacitor. Incorrect bootstrap diode selection, insufficient duty cycle, or wiring errors can also prevent the high-side driver from operating correctly.

4. What happens if no dead time is added between the high-side and low-side switches?

Without sufficient dead time, both switches may conduct simultaneously, causing shoot-through current. This can lead to excessive heating, reduced efficiency, and possible damage to the MOSFETs and driver circuit.

5. Can the IR2110 be used with 3.3 V microcontrollers?

In some cases, yes, but logic-level compatibility should be verified. If the logic signal is not sufficient for reliable operation, a level-shifting circuit may be required.

6. How does gate resistor value affect IR2110 performance?

Smaller gate resistors increase switching speed but may create more ringing and EMI. Larger resistors reduce noise and switching stress but can increase switching losses.

7. What is the maximum practical switching frequency for the IR2110?

The practical limit depends on the MOSFET gate charge, PCB layout, gate resistor values, and power-stage design. Many designs operate successfully from tens of kilohertz to several hundred kilohertz.

8. When should an isolated gate driver be used instead of the IR2110?

An isolated gate driver is often preferred when safety isolation, high common-mode noise immunity, or separate control and power grounds are required by the application.