Gate Driver Symbol
Definition: The Gate Driver symbol represents a dedicated integrated circuit that amplifies a low-power logic control signal into the high-current drive waveform required to rapidly charge and discharge the gate capacitance of a power MOSFET or IGBT, shown in circuit diagrams as a rectangular block with IN (in), SD (sd), VCC (vcc), GND (gnd), and OUT (out) terminals.
Also known as: MOSFET driver, IGBT driver, gate drive IC, power switch driver, bootstrap driver, IR2110 symbol, half-bridge driver.
What the Gate Driver symbol means
The Gate Driver symbol denotes an IC or circuit block that interfaces the low-voltage, low-current output of a PWM controller or microcontroller with the gate of a power semiconductor switch (MOSFET or IGBT). The gate driver amplifies the logic-level PWM signal to provide the peak gate current (typically 1–10 A) needed to rapidly charge the gate capacitance and achieve fast, clean switching transitions.
The five terminals — IN (in) for the PWM logic input, SD (sd) for the shutdown or enable control, VCC (vcc) for the supply voltage, GND (gnd) for the ground reference, and OUT (out) for the gate drive output — represent the key connections of a single-channel gate driver IC. Half-bridge drivers (such as the IR2110) provide separate high-side and low-side channels with bootstrap circuitry for floating gate drive.
How to identify the Gate Driver symbol
The gate driver symbol is drawn as a rectangular block labelled 'Gate Driver' or with the IC part number (e.g., 'IR2110', 'UCC27517'). IN (in) enters from the upper-left as the PWM logic input; SD (sd) enters from the lower-left as the active-low shutdown or enable pin. VCC (vcc) connects to the top edge for the supply voltage; GND (gnd) connects to the bottom edge. OUT (out) exits from the right edge and connects to the gate pin of the downstream power MOSFET or IGBT.
Function and usage boundary
The gate driver IC takes the logic-level input on IN (in) and drives the power switch gate through OUT (out) with a peak source and sink current large enough to charge and discharge the gate capacitance in nanoseconds. Fast switching reduces switching losses (which scale with transition time) and prevents shoot-through (cross-conduction) in bridge topologies. The SD (sd) pin allows a fault signal from a protection circuit (over-current, over-temperature) to disable switching immediately. VCC powers the driver's internal push-pull output stage, and GND is the driver's low-side reference. Bootstrap gate drivers (like IR2110) derive the high-side supply from a bootstrap capacitor charged during the low-side turn-on phase.
Standards: IEC vs ANSI
| IEC 60617 | IEC 60617 and IEEE 315 define the general IC schematic symbol (rectangular body with labelled pins) used for gate driver ICs. IEC 60747-9 governs IGBTs and their gate drive requirements; IEC 60747-8 covers power MOSFETs. Gate driver ICs are typically represented as rectangular blocks in power circuit schematics. |
|---|---|
| ANSI/IEEE 315 | ANSI Y32.2 / IEEE 315 defines the rectangular IC body symbol used for gate drivers. IEEE Std 1071 (Guide for the Design and Application of MOSFET Gate Drive Circuits) provides guidance on gate driver application in power electronics. JEDEC standards (JESD24) define gate charge parameters used in gate driver design. |
| Key difference | Both IEC and ANSI use the standard rectangular IC body for gate driver symbols. The functional annotation (IN, SD, OUT, VCC, GND) is consistent between the two conventions. No unique IEC vs ANSI graphical distinction exists for gate driver symbols beyond the universal IC block representation. |
The displayed SVG is the live editor implementation, not a licensed reproduction or certification of an IEC or IEEE database glyph. Verify the exact official entry and project edition before issuing work.
Logical terminals
| Logical ID | Editor terminal name |
|---|---|
| in | IN |
| sd | SD |
| out | OUT |
| vcc | VCC |
| gnd | GND |
Where the Gate Driver symbol is used
- Inverter and converter circuits: gate driver IC drives high-side and low-side MOSFETs/IGBTs in half-bridge or full-bridge topologies for motor drives and UPS systems
- DC-DC converters: gate driver amplifies PWM controller output to switch power MOSFETs in buck, boost, and flyback converters
- Class D audio amplifiers: gate driver switches output MOSFETs at 200–400 kHz to reconstruct audio waveforms
- EV motor controllers: isolated gate drivers drive IGBT modules in three-phase traction inverters with galvanic isolation from high-voltage bus
- Solar micro-inverters: gate driver controls synchronous rectifier MOSFETs in the DC-DC stage
- Induction heating: gate driver switches resonant bridge IGBTs at 20–100 kHz for domestic induction cooktops and industrial induction heaters
Key facts
- The Gate Driver symbol represents a dedicated IC that amplifies a PWM logic signal to the high current levels needed to rapidly switch power MOSFETs or IGBTs, reducing switching losses.
- The five terminals are IN (in) for PWM logic input, SD (sd) for shutdown or enable, VCC (vcc) for supply voltage, GND (gnd) for ground, and OUT (out) for the gate drive output.
- Gate drivers provide peak gate currents of 0.5 A to 10 A, far exceeding the 20–40 mA source/sink capability of standard microcontroller or PWM controller outputs.
- Fast gate transitions (5–50 ns) reduce switching losses, which are proportional to rise/fall time and switching frequency in power converters.
- Bootstrap gate drivers (e.g., IR2110) drive the high-side switch in a half-bridge by using a bootstrap capacitor charged to VCC during the low-side on-time, enabling high-side switch operation above the supply rail.
- Isolated gate drivers (e.g., ACNW3190, Si8271) provide galvanic isolation between the controller and gate, essential for driving IGBTs in high-voltage inverters where the switch source (emitter) floats at high voltage.
- The SD (shutdown) pin allows external protection circuits (over-current, over-temperature, under-voltage) to disable the gate driver immediately, protecting the power switch from catastrophic failure.
Frequently asked questions
What does the gate driver symbol mean in a circuit diagram?
The gate driver symbol represents a dedicated amplifier IC that converts a low-power PWM logic signal into the high-current drive pulse needed to rapidly switch a power MOSFET or IGBT. It appears in power electronics schematics between the PWM controller and the power switch gate terminal.
What does the gate driver symbol look like?
The gate driver symbol looks like a rectangular block labelled 'Gate Driver' with IN (in) and SD (sd) pins on the left, VCC (vcc) on top, GND (gnd) on the bottom, and OUT (out) on the right connecting to the power transistor gate.
Why is a gate driver needed — why not connect the PWM signal directly to the MOSFET gate?
A PWM controller or microcontroller output can typically supply only 20–40 mA. The gate capacitance of a power MOSFET (typically 1–100 nF) must be fully charged and discharged each switching cycle; at low current the transition is slow, causing excessive switching losses and potential cross-conduction. A gate driver supplies 1–10 A peak current, completing the transition in nanoseconds.
What is a bootstrap gate driver?
A bootstrap gate driver (e.g., IR2110) provides both a high-side and low-side gate drive output. The high-side driver is powered by a bootstrap capacitor charged to VCC during the low-side on-phase. The bootstrap technique allows the high-side MOSFET gate to be driven above the supply rail voltage, which is essential for N-channel MOSFETs used as high-side switches in half-bridge and full-bridge topologies.
What is the SD (shutdown) pin on a gate driver?
The SD (shutdown) pin is an active-low or active-high enable/disable input. When SD is asserted (typically pulled low for active-low logic), the gate driver disables its output and holds the gate of the power switch at zero volts (or negative for IGBTs), immediately turning off the switch. This allows fast hardware-level protection from overcurrent, over-temperature, or under-voltage fault conditions.
What is the difference between isolated and non-isolated gate drivers?
A non-isolated gate driver (e.g., UCC27517) shares a common ground with the PWM controller and is used for low-side switches or where the switch source is at a stable reference potential. An isolated gate driver (e.g., ACNW3190) provides galvanic isolation (typically 2.5–5 kV) between the controller-side ground and the gate-side ground, essential for high-side switches in high-voltage bridges where the switch source floats at high voltage.
What supply voltage does a gate driver IC require?
Standard gate driver ICs are supplied at 5 V to 20 V. For MOSFET gates, VCC is commonly 10–15 V to ensure full enhancement and low on-resistance (RDS(on)). For IGBT gates, VCC is typically 15 V on and -8 V to -15 V off (negative turn-off voltage helps prevent spurious turn-on from noise). The SD and IN logic levels are typically TTL (2 V threshold) or CMOS (3.3 V or 5 V) compatible.
Related symbols
Physical breadboard, PCB, and panel mapping
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