Half Bridge with Single PWM Input

  • Rajkumar Sharma
  • 23 Views
  • easy
  • Tested
  • SKU: EL148984
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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

NOQNTY.REF.DESC,MANUFACTURERSUPPLIERSUPPLIER PART NO
12CN1,CN22 PIN SCREW TERMINAL PITCH 5.08MMPHOENIXDIGIKEY277-1247-ND
21CN3 4 PIN MALE HEADER PITCH 2.54MMWURTHDIGIKEY732-5317-ND
31C1100nF/50V CERAMIC SMD SIZE 0805YAGEO/MURATADIGIKEY
41C2220uF/50V ELECKTROLYTICPANASONICDIGIKEYPCE3921CT-ND
51C3100nF/50V CERAMIC SMD SIZE 0805YAGEO/MURATADIGIKEY
61C447uF/35V ELEKTROLYTICWURTHDIGIKEY732-8508-1-ND
71C5100nF/50V CERAMIC SMD SIZE 0805YAGEO/MURATADIGIKEY
81D1LED SMD SIZE 0805OSRAMDIGIKEY475-1278-1-ND
92D2,D31N4148ONSEMIDIGIKEYFDLL4148CT-ND
102Q1,Q2FDD86369 DPAKONSEMIDIGIKEYFDD86369OSCT-ND
111R12.2K 5% SMD SIZE 0805YAGEO/MURATADIGIKEY
122R2,R310E 5% SMD SIZE 0805YAGEO/MURATADIGIKEY
131R447K 5% SMD SIZE 0805YAGEO/MURATADIGIKEY
141U1LM5104 SOIC8TIDIGIKEYLM5104MX/NOPBCT-ND

Block Diagram

Connections

Typical Application

Gerber View

Photos

Video

LM5104 Datasheet

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