Signal Consulting, LLC 

 Model Si5PiUdMC1-30V-32A

Single, Open-Loop, Pulse Input, Unidirectional, 30V-32A DC Motor Controller with Integrated Heat Sink and with 5kHz or 20kHz Output PWM, T-Chip





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 Si5PiUdMC1-30V-32A Features:
Power Semiconductors: Two 60A MOSFETs
Max. Continuous Current: 32A with Heat Sink shown
Max. Current ( for 5sec): 60A with Heat Sink shown
Overall Dimensions: 2.4" x 2.3" x 2.2" (61 x 58 x56mm).
Components Type: 100% Solid State, NO Relays

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

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

 The Control Input is a variable pulse-duration 0-12V, PWM input-voltage (VI1,G) with carrier frequency greater than 120Hz. This input contains an RC integrator with Time-Constant of 0.5 sec and a 5.1V clipping circuit .

  The Load-Voltage is adjustable from 0V to 30V in 0.25V steps ( or max. value of Vp) 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 30V and 32A

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)


 Si5PiUdMC1-30V-32A Spec Sheet  (PDF)

The Si5PiUdMC1-30V-32A is a 30V, 32A, microprocessor based, Single, Open-Loop, Pulse-input, 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 960W power range, with 8.0W steps. An onboard microprocessor generates a 5kHz or 20kHz output PWM carrier signal, controls the load-power (or motor speed) and controls the load-current rate (or motor acceleration and deceleration). The output 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 (Pi) implies, the desired motor speed (or PWM pulse-duration) is set by a variable pulse-duration 0-12V, PWM input-voltage (VI1,G) with carrier frequency greater than 120Hz. This input contains an RC integrator with Time-Constant of 0.5 sec and a 5.1V clipping circuit that provides protection. 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 1.5s, is selected by short-circuit (J1 jumper installed); while the fast buildup mode, with rise-time/fall-time of 0.75s, is selected by leaving these pins open (no Jumper installed). All control lines (analog and digital) are sampled approximately at 20Hz rate in the fast mode, and at 15Hz rate in the slow mode.  An onboard LED (red) is used to monitor the load-voltage. A small (2.3”x2.4”x0.95”) finned integrated heat sink is included with mounting hardware (as shown on the photograph) to operate at 32A or 960W power levels. Higher power-levels (30V, 40A or 1200W) 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 9V to 30V DC power source (unregulated) at a 0A to 32A 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 Si5PiUdMC1-30V-32A

In this application, the motor speed (or PWM pulse-duration) is linearly adjusted with a 0 to 12V, 120Hz, variable pulse-duration PWM input signal applied to I1 pin (VI1,G). This input signal is efficiently controlling the motor power from 0 to 960W in 8.0W 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 40A bridge rectifier and an optional C=2200uF, 35V capacitor   ( 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-voltage and low-current 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.  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.

Si5PiUdMC1-30V-32A Pulse-Input, Unidirectional, Motor Controller with integrated Heat Sink, 1 DC Load at 30V, 32A
Price $169.00

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



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