TC648B - Uncategorized Microchip - Free user manual and instructions
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| Product Type | Fan Speed Controller IC |
| Brand | Microchip |
| Model | TC648B |
| Category | Integrated Circuits |
| Package Type | SOIC-8 / PDIP-8 |
| Supply Voltage Range | 3.0V to 5.5V DC |
| Output Type | PWM (Pulse Width Modulation) output |
| Temperature Sensor Input | External thermistor or voltage input |
| Fan Failure Detection | Yes, via sense pin |
| Auto Fan Shutdown | Yes, when temperature is below threshold |
| Operating Temperature Range | -40°C to +85°C |
| Dimensions (SOIC-8) | Approximately 5.0 mm x 4.0 mm |
| Weight | Less than 1 g (negligible) |
| Power Consumption | Low-power CMOS design |
| Main Functions | Controls fan speed proportional to temperature |
| Maintenance | Keep leads clean; handle with ESD precautions |
| Safety | Do not exceed absolute maximum ratings; avoid short circuits |
| Spare Parts / Repairability | Replacement IC available; surface-mount rework possible |
| General Information | RoHS compliant, lead-free |
Frequently Asked Questions - TC648B Microchip
How do I connect the TC648B to a fan?
Connect the fan motor to the VOUT pin (typically pin 5) and provide power to the fan through the IC. The PWM output controls the fan speed based on temperature.
What supply voltage is required for the TC648B?
The TC648B operates with a supply voltage between 3.0V and 5.5V. Ensure the voltage is within this range to avoid damage.
How does the temperature sensor input work?
Connect an external thermistor or a voltage source to the TEMP pin. The IC interprets this signal to determine the appropriate fan speed.
Can I use the TC648B with a 12V fan?
No, the TC648B is designed for low-voltage fans (3-5V). For a 12V fan, you would need an external MOSFET or driver circuit.
What is the maximum output current?
The maximum output current is typically 50 mA directly from the IC. For higher currents, use an external transistor or MOSFET.
How do I set the minimum fan speed?
The minimum fan speed can be set with an external resistor connected to the MIN pin. Adjust the resistor value to set the desired minimum duty cycle.
Does the TC648B have over-temperature protection?
Yes, the IC includes over-temperature shutdown to protect the fan and circuit. It automatically turns off the fan if the temperature exceeds a safe threshold.
How do I detect a fan failure?
Use the FAN SENSE pin (pin 4) to monitor the fan tachometer signal. If the signal stops, the TC648B can be configured to trigger an alarm or shut down.
Can I use this IC in a PWM-controlled system?
Yes, the TC648B itself generates a PWM output to control the fan. It can be used as a standalone controller or integrated into a larger PWM system.
What are the common applications for the TC648B?
Common applications include power supplies, audio amplifiers, and other electronic devices that require temperature-based fan speed control for cooling.
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Product information
Brand : Microchip
Model : TC648B
Category : Uncategorized