Signal Consulting, LLC 

 Model Si50HyUdMC1-50V-50A

Single, Open-Loop, Hybrid, Unidirectional, 50V-50A DC Motor Controller with Integrated Heat Sink, 5kHz or 20kHz PWM, T-Chip





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 Si50HyUdMC1-50V-50A Features:
Power Semiconductors: Two 200A MOSFETs
Max. Continuous Current: 50A, with Finned Heat-Sink (as Shown).
Max. Current for 5 sec: 100A with Proper Heat-sinks
Board's Size: L=3.2", W=2.6", H=1.9", (8.12 x 6.6 x 4.82cm).
Overall Size (with Large Heat Sink): L=5.9", W=3.7",H=2.4"

Components Type: 100% Solid State, NO Relays

  A single DC Motor or Load is controlled  by a Pulse Width Modulator (PWM).

 PWM carrier frequency is  user selectable with a jumper, 20kHz when the jumper is open and 5kHz when closed.

  The Load-Voltage is adjustable from 0V to 50V (or to Vp) in 120 steps  with an analog control signal or with an internal or external potentiometer.

  User can choose between slow or fast motor acceleration/deceleration modes.

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

On Board:
Filter Capacitors
VTS diodes
Snubber Circuit Ready
Voltage Requirement:
A single DC Source Voltage (unregulated ) with any voltage value from 10V to 50V (for Vp)


   For Details, Download the  Si50HyUdMC1-50V-50A-3T6   Manual


The Si50HyUdMC1-50V-50A is a 50V, 50A microprocessor based, Single, Open-Loop, Hybrid, Unidirectional, Motor-Controller board that uses 5kHz or 20kHz pulse-width modulation (PWM) to efficiently control the speed of a brush type DC motor (or load  current ) in the 0 to 2500W power range, and in 20.1W steps. An onboard microprocessor generates a 5kHz or 20kHz PWM carrier signal, controls the load-power (or motor speed) and controls the load-current rate (or motor acceleration and deceleration). The PWM carrier frequency is user selectable by the jumper CN4, 20kHz when CN4 is open and 5kHz when short. The high frequency PWM rate provides a smooth speed control and insures a quiet motor environment. As the name hybrid (Hy) implies, the desired motor speed (or PWM pulse-duration) is set by a variable (0 to +5V) analog input-voltage VI1,G, providing a smooth motor-speed control from 0 to 100% in 0.833% steps; while the other control-signals are digital. This analog input (VI1,G) is zener-diode protected and includes an integrator with a time-constant of 0.01s; accordingly, this input can be driven with DC or PWM signals. The user can choose between slow or fast motor acceleration/deceleration modes by short-circuiting or open-circuiting the pins labeled J1.  The slow mode, with rise-time/fall-time of 0.5s, is selected by short-circuit (J1 jumper installed); while the fast buildup mode, with rise-time/fall-time of 0.025s, is selected by leaving these pins open (no Jumper installed). An onboard LED (red) is used to monitor the load-voltage. A small (3.0”x4.0”x1.0”) finned heat-sink is required to operate 2500W power level (or at 50V and 50A). Higher current level levels (60A at 50V or 3000W) can be achieved with more efficient heat-sinks (5” x 5” x 1.5” finned heat sink). This board requires a single 9V to 50V DC unregulated power source at a 0A to 50A current range to operate normally. Typical applications are: DC Motor-Speed Controller, Light-Dimmer with variable delay, Power Amplifier, SPST Solid State Relay, etc. This board can be configured and programmed to perform efficiently in many customized applications.

A Typical Application of the Si50HyUdMC1-50V-50A

In this application, the motor speed (or PWM pulse-duration) is linearly adjusted with the Si5Pot1-5k accessory (an external 1-turn 5kW pot); and efficiently controlling the motor power from 0 to 2500W in 20.1W steps. The DC Motor can be purchased from Bodine, ; or from other vendors, Warning:  The connecting wires to the Motor and the Power Supply must be heavy gauge copper wire (#10 AWG or heavier) to handle the rated current level. In addition, these heavy gauge wires act as a heat sink, protecting the board from overheating.

An inexpensive, unregulated DC power supply design is shown in this application drawing. This power supply consists of a transformer, a 70A bridge rectifier and an optional capacitor (recommended with heavy loads) C=6800uF, 35V ( part number 493-1323-ND).  The secondary voltage and current rating of the transformer determines the DC voltage and current output of this power supply. Low-current output transformers can be purchased from with the following part numbers: for 33V, 10A DC output use transformer 7846-TR; for 16V, 4A DC output use transformer 7840-TR. The component cost of this low-current output power supply is under $50. A wide variety of linear and switching power supplies can, also, be used with this board. Consult the most recent catalog on to purchase these power supplies.

Si50HyUdMC1-50V-50A Hybrid Unidirectional Motor Controller, 1 DC Load at 50V, 50A.  
Price $259.00

Note: If Buying the Si50HyUdMC1-50V-50A, it is recommended to buy one  Si5Pot1-5k Potentiometer.

Si5Pot1-5k   1-Turn, Linear Taper, 5kW Potentiometer.
Price $15.00

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



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