Signal Consulting, LLC 

Model Si52HyUdMC1-120V-20A 

Single, Open-Loop, Hybrid, Unidirectional, 120V at 20A, DC Motor Controller with Integrated Heat Sink and with 5kHz or 20kHz PWM, T-Chip





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 Si52HyUdMC1-120V-20A Features:
Power Semiconductors: One 90A MOSFET
Max. Continuous Load Current: 20A with Heat Sink as shown
Max. Load Current for 5sec: 60A with Heat-sink as shown
Overall Dimensions: 4.0" x 3.3" x 1.5" (102 x 84 x38mm).
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 120V in 0.833% 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 120V and 20A

On Board:
Filter Capacitors
VTS diodes
Snubber Circuit Ready
Voltage Requirement:
A single DC Source Voltage (unregulated) with any voltage value from 30V to 120V (for Vp)



 Si52HyUdMC1-120V-20A-2T,  Spec Sheet  (PDF)

The Si52HyUdMC1-120V-20A is a 120V, 20A 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 2400W power range, and in 20W 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 can withstand severe overloads.. 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. Both of these jumpers are examined only at power turn-on; consequently, the power must be turned on and off whenever these jumpers are reconfigured.  A small (4.0”x3.3”x0.0.062”) Aluminum Plate (integrated heat sink) is included with mounting hardware (as shown on the photograph) to operate at 20A or 2400W power levels. Higher power-levels (120V, 30A or 3600W) can be achieved with more efficient heat-sinks. Please click on this link and read the Board Mounting Instructions and Heat Sink Selection Guide. Typical applications are: Inductive-Plunger Driver, SPST Solid State Relay, etc. This board can be configured to perform efficiently in many customized applications

 A Typical Application of the Si52HyUdMC1-120V-20A

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 2400W in 20W steps. The DC Motor can be purchased from Bodine, ; or from other vendors, An inexpensive, unregulated DC power supply design is shown in this application drawing. This power supply consists of a transformer, a 25A bridge rectifier and an optional capacitor (C=2000uF, 150V).  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.

  Warning:  The connecting wires to the Motor and the Power Supply must be heavy gage copper wire (#12 AWG or heavier) to handle the rated current level. In addition, these heavy gage wires act as a heat sink, protecting the board from overheating.

Si52HyUdMC1-120V-20A , Single, Hybrid DC Motor Controller with  Heat Sink, 1 DC Load at 120V, 20A 
Price $239.00

Note: If Buying the Si52HyUdMC1-120V-20A, it is recommended to buy one Si5Pot1-5k Potentiometer.

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

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



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