Dual MOSFET Driver – Two Channel DC SSR Using MOSFETS & Gate Driver

  • Rajkumar Sharma
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  • moderate
  • Tested
  • SKU: EL123850
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The project presented here is a dual-channel MOSFET DC relay. The project is capable of driving a 5A load on each channel with an input supply of 48V DC. The LTC7067 chip drives the two high-side N-Channel MOSFETS with supply voltages up to 48V DC. Its powerful 0.8Ω pull-down and 1.5Ω pull-up MOSFET drivers allow the use of large gate capacitance and high voltage MOSFETs. Additional features include UVLO, TTL/CMOS compatible inputs, and fault indicator. The optional diodes D2 and D3 can be used for inductive loads. Open-Drain Fault Output is available. The open-drain output pulls to GND during VCC UVLO/OVLO and floating supplies UVLO condition.

Note 1: The project requires dual supply, VCC and VDD, VDD is load supply in the range 12V to 48V, and gate supply 12V to 14V. The board can work with a single supply if the load supply is between 12V to 14V in this case close jumper J1
Note 2: The project can work with a higher load supply up to 140V. In this case, use appropriate MOSFET Q1 and Q2 and choose higher voltage capacitor C2, C3
Note 3: C5, C6, C7 are optional DC Bus capacitors, and can be used as per user’s requirements
Note 4: The project is capable of driving resistive loads. Optional diodes D2, D3 are provided for inductive loads such as motors, solenoids. Recommended diode MBRS360 3A-60V

Features

  • VDD (Load Supply) 12V to 48V DC
  • VCC for Gate Driver 12-14V DC
  • Load 5A Each Channel with Forced Air Cooling (Fan)
  • On-Board Jumper for 12V-14V Single Supply Operations for Load and Gate Driver
  • Fault Condition Output Normally High, Goes Low When UVLO/OVLO and Floating Supplies UVLO Condition Occurs
  • Optional Clamp Diode D2, D3 for inductive Loads
  • TTL/CMOS Compatible Control Inputs
  • Input PWM Duty Cycle 0 to 100%
  • Input Frequency 20Khz-Tested (Supports Higher Frequency)
  • Under Voltage Lockout
  • 4 x 3MM Mounting Holes
  • Onboard Power LED
  • PCB Dimensions 53.98 x 45.09mm

Connections CN3 Connector

  • Pin1 VDD Load Supply 12V to 48V
  • Pin2 VCC Gate Driver Supply 12V to 14V
  • Pin3 Input 1
  • Pin4 Input 2
  • Pin5 Fault Output Normally High
  • Pin6 GND

Other Components Details

  • Connector CN1 and CN2 Load 1 and Load2
  • Connector CN3 Load Supply 12V to 48V
  • LED D1 Power LED
  • Jumper J1 for Single Supply Operation (Read Note 1)
  • CN5 Not In use

Schematic

Parts List

NOQNTYREFDESCMANUFACTURERSUPPLIERPART NO
12CN1,CN22 PIN SCREW TERMINAL PITCH 5.08MMPHOENIXDIGIKEY277-1247-ND
21CN36 PIN MALE HEADER PITCH 2.54MMWURTHDIGIKEY732-5319-ND
31CN42 PIN SCREW TERMINAL PITCH 5.08MMPHOENIXDIGIKEY277-1247-ND
41CN52 PIN MALE HEADER PITCH 2.54MMWURTHDIGIKEY732-5315-ND
51C110uF/16V SMD 1210 OR 1206YAGEO/MURATADIGIKEY
62C2,C40.1uF/50V SMD SIZE 0805YAGEO/MURATADIGIKEY
71C3220uF/50V SMD ELKTROLYTICWURTHDIGIKEY732-8463-1-ND
85D2,D3,C5,C6,C7DNPREAD NOTE
91D1LED RED SMD SIZE 0805LITE ON INCDIGIKEY160-1427-1-ND
101J1JUMPER - 2 PIN MALE HEADER PITCH 2.54MMDIGIKEY732-5315-ND
112Q1,Q2IRF540 TO263INFINIONDIGIKEYIRF540NSTRRPBFCT-ND
121R11K 5% SMD SIZE 0805YAGEO/MURATADIGIKEY
131R251K 1% SMD SIZE 0805YAGEO/MURATADIGIKEY
141U1LTC7067ANALOG DEVICEDIGIKEY505-LTC7067RMSE#PBF-ND
151J1-SJUMPER SHUNTSULLINS CONNECTORDIGIKEYS9001-ND

Connections



Gerber View

Photos

Video

LTC7076 Datasheet

ltc7067

PCB

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