Signal Consulting, LLC 

 Model Si5HyUdMC1-90V-20A 

Single, Open-Loop, Hybrid, Unidirectional, 90V-20A DC Motor Controller with Integrated Heat Sink and with 5kHz or 20kHz PWM, T-Chip





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 Si5HyUdMC1-90V-20A Features:
Power Semiconductors: Two 60A MOSFETs
Max. Continuous Load Current: 20A with Heat Sink as shown
Max. Load Current for 5sec: 60A with Heat-sink as shown
Overall Dimensions: 2.4" x 2.3" x 1.5" (61 x 58 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 90V 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 90V and 20A

On Board:
Filter Capacitors
VTS diodes
Snubber Circuit Ready
Voltage Requirement:
A single DC Source Voltage (unregulated) with any voltage value from 20V to 90V (for Vp)


 Si5HyUdMC1-90V-20A-7T5 Spec Sheet  (PDF)

The Si5HyUdMC1-90V-20A is a 90V, 20A, microprocessor based, Single, Open-Loop, Hybrid, Unidirectional Motor-Controller board that uses pulse-width modulation (PWM) to efficiently control the speed of a brush type DC motor (or load  current ) in the 0 to 1800W power range, with 15W 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. 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). All control lines (analog and digital) are sampled approximately at 700Hz rate in the fast mode, and at 20Hz rate in the slow mode.  An onboard LED (red) is used to monitor the load-voltage. A small (2.3”x2.4”x0.45”) finned integrated heat sink is included with mounting hardware (as shown on the photograph) to operate at 20A or 1800W power levels. Higher power-levels (90V, 30A or 2700W) can be achieved with more efficient heat-sinks. Please click on this link and read the Board Mounting Instructions and Heat Sink Selection Guide.  This board requires a single 2V to 90V DC power source (unregulated) at a 0A to 20A 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 Si5HyUdMC1-90V-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 1800W in 15W 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 (purchased from  with part number MB256-ND) and an optional C=1200uF, 100V capacitor.  The secondary voltage and current rating of the transformer determines the DC voltage and current output of this power supply. 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 gauge copper wire (#12 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.

Si5HyUdMC1-90V-20A Hybrid Unidirectional Motor Controller with Heat Sink, 1 DC Load at 90V, 20A
Price $189.00

Note: If Buying the Si5HyUdMC1-90V-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.



All Products Are Proudly Made in the USA