Signal Consulting, LLC 

Model Si5HyUdMCDF1-30V-20A

Single, 30V 20A, Proportional, Closed-Loop, Hybrid, Unidirectional Motor Controller with Integrated Heat Sink, Digital Feedback Port and with 5kHz or 20kHz PWM, T-Chip





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 Si5HyUdMCDF1-30V-20A Features:
Power Semiconductors: Two 60A MOSFET
Max. Continuous Current: 20A with Heat Sink as Shown
Max. Current for 5sec: 40A with Heat Sinks 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.

Jumper (J1M) Selectable Control Modes: Open-Loop Mode (when J1M Open), Closed-Loop Mode (when J1M Short).

One (0 to +5V) External Analog Control Input (VI1,G) is Provides for Set-RPM Adjust (or PWM Control).

One Digital Optical Feedback  Port is Provided for Motor-Speed Regulation.

  The Load-Voltage is adjustable from 0V to Vp with  an analog control signal (VI1,G )or with an internal or external potentiometer.

  High Power-Efficiency: 98.5% typical, at 30V and 20A

On Board:
Filter Capacitors
VTS diodes
Snubber Circuit Ready
Voltage Requirement:
A single DC Source Voltage (unregulated ) with any voltage value from 9V to 30V (for Vp)


 Si5HyUdMCDF1-30V-20A,  Spec Sheet  (PDF)

The Si5HyUdMCDF1-30V-20A  is a 30V 20A, microprocessor based, Single, Closed-Loop, Hybrid, Unidirectional, Motor-Controller with an integrated heat sink and with a Digital Feedback port.  This board uses pulse-width modulation (PWM) to efficiently control the speed of a brush type DC motor (or load current) in open or closed loop control mode in the 0 to 600W power range, and in 5W steps. The desired control mode is selected by a jumper (J1M). An open-circuit (no jumper) selects the open-loop mode, while short-circuit (jumper installed) selects the closed-loop mode. The desired motor speed (or load current) is set by a (0 to 5V) range external analog voltage (applied to I1 input pin on port CN4). The Si18V1RPM-Sens optical interrupter (connected to port CN3) along with Si18V1RPM-Wheel optical wheel (mounted on the motor shaft) provides proportional feedback, keeping the motor-shaft rotating at a constant speed. The speed-range is adjustable with an onboard 25-turn trim pot in the 50 to 3000 rpm range. This board requires a single 9V to 30V DC power source (unregulated and unfiltered) at a 0A to 20A current range to operate normally.  An onboard microprocessor generates a 5kHz or 20kHz PWM carrier signal, controls the load-power (or motor speed) and monitors the sensor inputs. 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 motor-speed control, and insures a quiet motor environment. As the name hybrid (Hy) implies, the required motor speed (or PWM pulse-duration) is derived from a variable analog-voltage (VI1,G), while the other control-signals are digital. This analog (I1) input is zener-diode protected. 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 600W power levels. Higher power-levels (30V, 33A or 1000W) 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: DC Motor-Speed Controller, Light-Dimmer with variable delay, Power Amplifier, SPST Solid State Relay, etc. 

A Typical Application of the Si5HyUdMCDF1-30V-20A

In this closed-loop application (shown below) the shaft-speed of a 24V DC Motor is controlled, with the accessories Si18V1RPM-Sens and Si18V1RPM-Wheel. The desired 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 in the 0 to 600W range in 4W 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 (#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.  

Si5HyUdMCDF1-30V-20A, Hybrid Unidirectional Motor Controller, Heat Sink, Digital Feedback, 1 Load 30V, 20A
Price $159.00

Note: If Buying the Si5HyUdMCDF1-30V-20A, it is recommended to buy one Si5Pot1-5k Potentiometer, one Si18RPMsens, and one Si18RPMwheel.

Si5Pot1-5k   1-Turn, Linear Taper, 5kW Potentiometer.
Price $15.00
Si18RPMsens  Optical Interrupter Assembly with 8" leads and with 3-Pin Molex 22-01-3037 Connector.
Price $29.00
Si18RPMwheel   PC Encoder Disk,  2" OD,   0.065" thick, with 45 Counting-Hole.
Price $18.00

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



All Products Are Proudly Made in the USA