Signal Consulting, LLC 

 Model Si50HyUdMC1-30V-50A

Single, Open-Loop, Hybrid, Unidirectional, 30V-50A DC Motor Controller with Integrated Finned Heat Sink, 5kHz or 20kHz PWM, T-Chip





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 Si50HyUdMC1-30V-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=2.0"

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 30V (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: 98.5% typical, at 30V and 50A

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)


   For Details, Download the  Si50HyUdMC1-30V-50A-3T5   Manual


The Si50HyUdMC1-30V-50A is a 30V, 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 1500W power range, and in 12.5W 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 1200W power level (or at 30V and 40A) Higher current level levels (50A at 30V or 1500W) can be achieved with more efficient heat-sinks (5” x 5” x 1.5” finned heat sink). This board requires a single 9V to 30V 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 Si50HyUdMC1-30V-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 1500W in 12.5W 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 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.

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.

Si50HyUdMC1-30V-50A, Hybrid Unidirectional Motor Controller, 1 DC Load at 30V, 50A  
Price $249.00

Note: If Buying the Si50HyUdMC1-30V-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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