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

Rajkumar Sharma
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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

NO	QNTY	REF	DESC	MANUFACTURER	SUPPLIER	PART NO
1	2	CN1,CN2	2 PIN SCREW TERMINAL PITCH 5.08MM	PHOENIX	DIGIKEY	277-1247-ND
2	1	CN3	6 PIN MALE HEADER PITCH 2.54MM	WURTH	DIGIKEY	732-5319-ND
3	1	CN4	2 PIN SCREW TERMINAL PITCH 5.08MM	PHOENIX	DIGIKEY	277-1247-ND
4	1	CN5	2 PIN MALE HEADER PITCH 2.54MM	WURTH	DIGIKEY	732-5315-ND
5	1	C1	10uF/16V SMD 1210 OR 1206	YAGEO/MURATA	DIGIKEY
6	2	C2,C4	0.1uF/50V SMD SIZE 0805	YAGEO/MURATA	DIGIKEY
7	1	C3	220uF/50V SMD ELKTROLYTIC	WURTH	DIGIKEY	732-8463-1-ND
8	5	D2,D3,C5,C6,C7	DNP			READ NOTE
9	1	D1	LED RED SMD SIZE 0805	LITE ON INC	DIGIKEY	160-1427-1-ND
10	1	J1	JUMPER - 2 PIN MALE HEADER PITCH 2.54MM		DIGIKEY	732-5315-ND
11	2	Q1,Q2	IRF540 TO263	INFINION	DIGIKEY	IRF540NSTRRPBFCT-ND
12	1	R1	1K 5% SMD SIZE 0805	YAGEO/MURATA	DIGIKEY
13	1	R2	51K 1% SMD SIZE 0805	YAGEO/MURATA	DIGIKEY
14	1	U1	LTC7067	ANALOG DEVICE	DIGIKEY	505-LTC7067RMSE#PBF-ND
15	1	J1-S	JUMPER SHUNT	SULLINS CONNECTOR	DIGIKEY	S9001-ND