TKFAN PWM Signal Generator Modules
Engineered for high stability, precise frequency and duty cycle tuning, and robust industrial testing. Featuring digital LED displays and convenient rotary encoder adjustment. (Click image to zoom)
Angle View
Digital Display & Knob
Top View
Terminal Block & Interface
Closeup View
Fine Rotary Encoder
Backside View
Clean PCB Routing
PWM Generator 5V 25kHz Output - Product Dimensions
Compact and standardized physical layout with precise caliper measurements, designed for seamless integration into control panels and test fixtures. (Click image to zoom)
Dimension Drawing
50mm x 39mm Layout Structure
Width Measurement
Precision Caliper Verification
Length Measurement
50.17mm Exact Reading
Function Diagram
Terminals & Controls
High-performance PWM generators are widely integrated across testing laboratories, production lines, and OEM equipment across multiple industries:
1. Signal Distortion & Cable Attenuation
Pain Point: Standard signal sources often suffer from voltage drops, edge rounding, and high electromagnetic noise over long wires.
Solution: TKFAN PWM generators feature integrated low-impedance output buffers that preserve sharp rise/fall square-wave edges and output stability even in noisy industrial environments.
2. Inaccurate Duty Cycle & Low Frequency Steps
Pain Point: Coarse frequency tuning causes fan resonance or unstable motor rotation at specific RPM bands.
Solution: High-resolution digital tuning provides ultra-fine step adjustments (up to 0.1% duty cycle precision), eliminating motor hunting and enabling linear speed response curves.
3. Setup Complexity on Production Lines
Pain Point: Setting up computers or programming microcontrollers (MCU/PLC) for routine bench testing slows down quality assurance.
Solution: Standalone PWM signal modules provide instant plug-and-play adjustment via intuitive knobs/buttons and real-time LCD panels without writing any code.
4. Risk of Parameter Loss During Power Loss
Pain Point: Power disconnections reset test parameters, leading to configuration errors during mass testing.
Solution: Non-volatile EEPROM memory automatically saves last-used frequency and duty cycle parameters, guaranteeing consistency after every reboot.
PWM Generator - Frequently Asked Questions (FAQ)
Get expert technical answers regarding frequency selection, duty cycle scaling, wiring guidelines, and custom OEM options.
Q1: What is the main function of a PWM generator in motor and fan control?
A PWM generator outputs a digital square-wave signal with configurable frequency and duty cycle. It acts as an external signal controller to adjust motor speed, calibrate fan response curves, or test driver boards without requiring microcontrollers or PLC programming.
Q2: How does the duty cycle setting directly affect fan or motor speed?
Duty cycle represents the ratio of "ON" time versus the total period of a signal cycle. In standard 4-wire fans and BLDC drivers, a higher duty cycle (e.g., 90%) signals maximum rotational speed, whereas a lower duty cycle (e.g., 10%–20%) reduces speed or triggers standby mode depending on driver logic.
Q3: What PWM frequency setting is recommended for 4-wire DC cooling fans?
Per the standard Intel 4-wire PWM fan specification, the ideal control frequency is 25 kHz (acceptable range: 21 kHz to 28 kHz). Operating at 25 kHz prevents audible high-frequency coil humming during motor switching.
Q4: What signal voltage amplitude does the PWM generator output?
Depending on the module design, output amplitude can either be a fixed 5V TTL level or equal to the input power supply voltage (VCC, e.g., 3.3V–30V). Most standard fan control circuits and motor drivers readily accept 3.3V to 5V logic PWM inputs.
Q5: Can a single PWM generator drive multiple fans or drivers simultaneously?
Yes. Because a PWM signal is a low-power digital command (not the primary load power source), a single generator output can be connected in parallel to multiple fan or driver control pins, provided total sink current stays within the generator channel capacity.
Q6: How do I properly wire a 4-wire fan to a PWM signal generator?
Connect the main power wires (+VDC and GND) of the fan to your primary power supply. Connect the fan’s PWM input wire to the generator's PWM output terminal. Always ensure the ground (GND) wire of the PWM generator is tied to the main power supply GND for a common reference point.
Q7: What is the key difference between frequency (Hz) and duty cycle (%)?
Frequency (measured in Hz or kHz) dictates how many signal cycles occur per second, setting the operational switching speed. Duty cycle (expressed in %) specifies the width of the active pulse within each cycle, serving as the actual speed control value.
Q8: Do TKFAN PWM generators retain settings after a sudden power loss?
Yes. All TKFAN digital PWM signal generators include built-in EEPROM non-volatile memory. Selected duty cycles and frequencies are stored automatically and restored immediately upon re-powering.
Q9: What is the operating voltage range required to power the PWM generator module?
Our standard PWM generator boards support a wide input operating range of DC 3.3V to 30V, allowing flexible integration with standard 5V, 12V, or 24V power rails across test systems.
Q10: Can TKFAN customize PWM generators for specific OEM/ODM equipment?
Yes. We offer complete OEM/ODM customization services including custom PCB geometry, panel-mount bezels, custom output signal voltage levels, dedicated enclosure designs, and pre-programmed default factory frequencies.
