Signal Consulting, LLC 

Model Si30HFHB-50V-30A-AHC 

50V-30A High-Frequency H-Bridge, DC to 20kHZ PWM, with Active-High Control, Integrated Finned Heat-Sink, for Bidirectional DC Motor Driver





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Si30HFHB-50V-30A-AHC Features:
Power Semiconductors: Eight 90A MOSFETs.

Overall Dimensions : 4.6”x2.43”x2.0”, (117 x 62 x 52 mm).

Load Isolation: The Load must be Isolated from the  Power Source.

Max. Continuous Current: 30A with Heat-Sink (as shown).

Max. Current for 5 sec: 50A with Heat-Sink ( as shown ).

Power-Conversion Efficiency: Approx. 98.5% (at 50V, 30A).

Control Type: Active High (0 to+5V).

Worst-Case Control Latency: 7 micro seconds.

Load Voltage Rise or Fall-Time (10% to 90%): 12 micro seconds.

Voltage Requirements: A single DC Source (unregulated or regulated ), any voltage from 12V to 50 V DC.

Load-Voltage Indicator: Bicolor LED.

Onboard 30A Fast Mini-Blade Auto Fuse: Replace, from  DigiKey, Part Number: F6079-ND

Components Type: 100% Solid State, NO Relays

On Board: 
Filter Capacitors
VTS diodes
Snubber Circuit included

  For Details, Download the  Si30HFHB-50V-30A-AHC-1Y2   Manual


The Si30HFHB-50V-30A-AHC is a 50V 30A, microprocessor based, high-frequency, H-Bridge with active-high (0 to +5V) control inputs. This controller requires two active high inputs (or two 0 to 20kHz PWM inputs) on pin I1 and on pin I2 to control the speed and rotation direction of a DC motor (as shown on the truth table given below). An onboard microprocessor samples the control inputs at 150kHz rate and generates the timing signals for the H-Bridge. The high sampling rate provides a worst-case control latency of 7uS when the bridge is changing current direction or switching on or off. Two active high digital (0 to +5V) control signals (VI1,G  and VI2,G) or switches are used to select the direction of rotation (or Load-Current Direction). These inputs can be Pulse Width Modulated (PWM) from DC to 20kHz carrier rate. This board uses a single (12V to 50V at 30A) DC power supply to control the speed of a DC motor (or load current) in forward or reverse direction. A bicolor LED is used to monitor the motor (or load) voltage (Red = Forward, Green = Reverse). A small (4.6”x2.4”x1.0”) integrated finned heat-sink is used to operate the bridge at 30A (continuous) current levels. Higher current-levels (40A) 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 operates in a wide voltage-range (12V to 50V) at a maximum continuous load-current of 30A. Typical applications are: Bi-directional DC Motor-Speed Controller, Peltier Effect TE Coolers, Heat Pumps, DPDT Solid State Relay, etc. This board can be configured and programmed to perform efficiently in many customized applications. 

Control Input Truth Table (for Control connector CN5)

         The VI1and VI2 control lines can be Pulse-Width Modulated (PWM in a range of 0-20k Hz) to vary the average current supplied to a load or to a DC Motor.

Frequency Response of the Si30HFHB-50V-30A-AHC

This plot shows the maximum average load current as a function of PWM carrier frequency (in Hz) at 100% duty-cycle. This plot was obtained with the finned heat-sink (4.6” x 2.4” x 1.0”, as shipped with the unit). Improved performance can be achieved with more effective heat-sinks.

 A Typical Application of the Si30HFHB-50V-30A-AHC

In this open-loop application, the motor direction is controlled by 2 external normally-open switches connected to pins I1 and I2 on port CN5 (using the internal +5V source as shown below), selecting the direction of rotational. These 0 to +5V inputs can be Pulse –Width Modulated over a wide Frequency range. 

Warning:  The connecting wires to the Load 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. Note that each connecting point on CN1 is available at 2 places, thus two smaller wires can be used in place of a larger one. Each Pin on CN1 has a current rating of 32A (or each connection point is rated at 64A jointly).

Typical Applications: Bidirectional Speed Controller, Bidirectional DC Motor Driver. Peltier Effect or TE Cells Driver, Heat Pump Controller, PPDT Solid State Relays.

Si30HFHB-50V-30A-AHC  50V at 30A, High-Frequency H-Bridge with Integrated Finned Heat-Sink, Active High Cont. 
Price $279.00

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



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