Signal Consulting, LLC 

Model Si14HyUdMC1-50V-20A

Hybrid, Unidirectional, Motor Controller with LCD Port,

  Load Voltage LED and with 5kHz or 20kHz PWM, Y-Chip





Buy this Product

 Si14HyUdMC1-50V-20A Features:
Power Semiconductors: Two 60A MOSFET
Max. Continuous Current: 20A with Heat Sink (as Shown)
Max.  Current for 5 sec: 40A with Heat Sink (as Shown)
Overall Dimensions: 61mm x 57mm x 44mm
Integrated Finned Heat Sink with 4-40 Standoffs and Screws   
Component Type: 100% Solid State,  RoHS Compliant RoHS Compliant

  Adjustable Load Voltage: The average Load-Voltage is adjustable from 0V to 50V in 0.83% steps ( or max. value of Vp) with a Pulse-Width Modulation (PWM) control signal or with an internal/external potentiometer.

  High Power-Efficiency: 97.5% typical, at 50V and 20A

  LCD Output port for %PWM and Ramp-Time Display

On Board:
Filter Capacitors
VTS diodes
Snubber Circuit Ready
Load-Voltage Indicator, LED (red)

Voltage Requirement:
A single DC Source Voltage (unregulated and Unfiltered) with any voltage value from 9V to 50V (for Vp)


 Si14HyUdMC1-50V-20A-1Y   Spec Sheet  (PDF)

The Si14HyUdMC1-50V-20A is a 50V, 20A  single, microprocessor based, Hybrid, Unidirectional, Motor Controller that uses pulse-width modulation (PWM) to efficiently control the power flow (or motor speed) to a brush type DC motor, from 0 to 1000W, in 8.33W steps. An onboard microprocessor generates a 5kHz or 20kHz PWM carrier signal, controls the load power (or motor speed), monitors the user inputs and selects the motor acceleration delay. An optional “Kill-Switch” can be connected to J1 for Emergency Stop (J1=Open= Run; J1=Short=Stop). The PWM carrier frequency is user selectable by the jumper J2, 20kHz when J2 is open and 5kHz when short. The high-frequency PWM rate provides a smooth motor-speed control, and insures a quiet motor environment. Two user selectable acceleration/deceleration modes are provided by short-circuiting or open-circuiting the pins labeled J3.  The slow mode, with rise-time/fall-time of 0.5s, is selected by short-circuit (J3 jumper installed); while the fast buildup mode, with rise-time/fall-time of 0.05s, is selected by opening these pins. As the name hybrid (Hy) implies, the required motor speed (or PWM pulse-duration) is derived from a variable 0 to +5V analog-voltages (VI1,G ), while the control-signals are digital. All analog control inputs are Zener Diode protected. An onboard LED (red) is used to monitor the load voltage and an optional. Snubbing circuits and filter capacitors are included to suppress inductive switching transients. A small Finned Heat Sink (2.4”x2.3”x0.9”) is required to operate at 20A current level (or at 1000W power levels). Higher current levels (30A) or 1500W power-levels can be achieved with more efficient heat-sinks. This can be accomplished by bolting the heat sink to a larger metal surface. Please click on this link and read the Board Mounting Instructions and Heat Sink Selection Guide. An optional 2 lines by 16 characters LCD (with 5V, 9600bps RS232 Interface Standard) is used for Measured-%PWM and Set-%PWM data display. This board requires a single unregulated 9V to 50V DC power source at 0A to 20A to operate normally. Typical applications are: DC Motor-Speed Controller with variable acceleration/deceleration, Light-Dimmer with variable Ramp-Time, etc.   

A Typical Si14HyUdMC1-50V-20A Application

In this 50V open-loop speed-control application, the PWM pulse-duration (or motor-speed) is linearly adjusted by an external 1-turn 5kW pot P1; and efficiently controlling the motor (or load) power in the 0 to 1000W range in 8.33W steps. This potentiometer can be ordered from Signal with part number of Si5Pot1-5k. A 2 line by 16 characters LCD (with 5V, 9600bps RS232 Interface Standard) is used for Set-RPM and Measured-RPM data display. The LCD with back-light can be ordered from Signal with part number of Si14LCD2L16CH-3PC. The DC Motor can be purchased from Bodine, Or from:  A wide variety of Linear and Switching Type of Power Supplies can be purchased from:

Si14HyUdMC1-50V-20A  Hybrid Unidirectional Motor Controller
Price $149.00

Note: If Buying the Si14HyUdMC1-50V-20A, it is recommended to buy one Si14LC2L16CH-3PC Display, one Si5Pot1-5k potentiometer.

Si14LC2L16CH-3PC  2 Line by 16 Character LCD with 12"  cable and 3-pin connectors.  
Price $59.00
Si5Pot1-5k  One 1-Turn, 5kW Potentiometer with 12" leads.  
Price $15.00

Buy this Product


Availability: We usually ship in 2-3 business days.



All Products Are Proudly Made in the USA