Half Bridge with Single PWM Input

This is a Half-bridge module based on the LM5104 chip, which is a high-voltage gate driver. This High-Voltage Gate Driver is designed to drive both the high-side and the low-side N-channel MOSFETs in a synchronous buck configuration. The floating high-side driver can work with supply voltages up to 100V. The high-side and low-side gate drivers are controlled from a single PWM input. Each state change is controlled adaptively to prevent shoot-through issues. In addition to the adaptive transition timing, an additional delay time can be added, proportional to an external setting resistor. An integrated high-voltage diode is provided to charge the high-side gate drive bootstrap capacitor. A robust level shifter operates at high speed while consuming low power and providing clean level transitions from the control logic to the high-side gate driver. Undervoltage lockout is provided on both the low-side and the high-side power rails.

The user must take care of the following:

• Bootstrap capacitor value depends on the input frequency
• Choose the right MOSFET as per Load Current/Voltage
• Choose the Right Value for delay resistor R4-RT, Depending on MOSFET Gate Capacitance. Refer to Datasheet for more info.

Features

• Power Supply Load up to 48V (Limited Due to Capacitor Volt)
• Power Supply Gate Driver 9V to 14V DC
• Load Up to 5Amps (Higher with Cooling Fan)
• Drives Both a High-Side and Low-Side N-Channel MOSFET
• Adaptive Rising and Falling Edges with Programmable
• Additional Delay
• Under Voltage Threshold 7V
• Adjustable Delay 90 to 200nS (RT(R4) 10K to 100K)
• Operating Frequency Input up to 1000Khz
• Single Input Control
• Bootstrap Supply Voltage Range up to 118-V DC
• Fast Turnoff Propagation Delay (25 ns Typical)
• Drives 1000-pF Loads With 15-ns Rise and Fall Times
• Supply Rail Under Voltage Lockout
• On Board Power LED
• Screw Terminals for Load Supply and Load
• Header Connector for Input signal and Gate Driver Supply
• 5mm x 4 PCB Mounting Holes
• PCB Dimensions 44.45 x 29.53 mm

Applications

• Current Fed Push-Pull Power Converters
• High Voltage Buck Regulators
• Active Clamp Forward Power Converters
• Half-Bridge and Full-Bridge Converters

Connections

• CN1: Pin 1 Power Supply Load 48V DC, Pin 2 = GND
• CN2: Pin 1 Output, Pin 2 = GND
• CN3: Pin 1 VDD 9V to 14V, Pin 2 = Load Power Supply, Pin 3 = PWM Input, Pin 4 = GND
• D1: Power LED

Schematic

Parts List

Block Diagram

Connections

Typical Application

Gerber View

Photos

Video

LM5104 Datasheet

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