IR2104 Half Bridge Driver IC

The IR2104S is a high-voltage, high-speed Half-Bridge Driver IC. It is designed to drive N-channel MOSFETs or IGBTs in half-bridge configurations, commonly used in applications like motor drives, inverters, and DC-DC converters. Below is a concise overview based on available information:

Features:

• High Voltage Capability: Drives high-side and low-side MOSFETs/IGBTs with a floating channel operational up to 600V.
• Bootstrap Operation: Includes a bootstrap diode for high-side driver supply, simplifying circuit design.
• Gate Drive Supply: Operates with a supply voltage range of 10V to 20V.
• Logic Compatibility: Accepts 3.3V, 5V, and 15V logic inputs (CMOS/TTL compatible).
• Current Capability: Typical source current of 0.21A and sink current of 0.36A for fast switching.
• Dead-Time Protection: Internal fixed 520ns dead-time to prevent shoot-through.
• Undervoltage Lockout (UVLO): Ensures safe operation by disabling outputs if the supply voltage is too low.
• Shutdown Pin: Inverting shutdown input (SD pin) for enabling/disabling the IC.
• dV/dt Immunity: Tolerant to negative transient voltages and high dV/dt, ensuring reliable operation in noisy environments.

Pinout:

1. IN: Logic input for controlling high and low-side outputs.
2. SD: Shutdown input (active low, disables both channels).
3. VCC: Low-side and logic supply voltage (10V–20V).
4. COM: Low-side return (ground).
5. LO: Low-side gate driver output.
6. VS: High-side floating supply return (connected to the source of the high-side MOSFET).
7. HO: High-side gate driver output.
8. VB: High-side floating supply voltage (bootstrap capacitor connection).

Applications:

• Motor Drives: Brushless DC motors, induction motors.
• Inverters: Solar inverters, UPS, variable frequency drives.
• DC-DC Converters: Synchronous rectification for high-efficiency power supplies.
• Other: LED drivers, halogen lamp drivers, Tesla coil drivers.

Schematic Notes:

• A bootstrap capacitor (connected between VB and VS) and diode are critical for high-side operation. The capacitor value affects switching performance.
• The PWM signal (e.g., from an Arduino on pin D9) drives the IN pin, while the SD pin (e.g., Arduino pin D8) can enable/disable the IC.
• PWM duty cycle is typically capped at 99.9% to ensure the bootstrap capacitor charges properly.

Critical Specifications:

• Ambient Temperature: -40°C to 125°C.
• High-Side Floating Voltage: Up to 600V.
• Propagation Delay: ~120ns (typical).