TC654EUNTR by Microchip | Soft Switching PWM Controllers | Avnet ASIA
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TC654EUNTR

Microchip

Soft Sw PWM Cntrlr 1-OUT HS 10-Pin MSOP T/R

Manufacturer Part #: TC654EUNTR

Alternate Part #: TC654EUNTR


RoHS Compliant

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Information

The TC654 is PWM mode fan speed controllers with FanSense technology for use with brushless DC fans. These devices implement temperature proportional fan speed control which lowers acoustic fan noise and increases fan life. The voltage at VIN (Pin 1) represents temperature and is typically provided by an external thermistor or voltage output temperature sensor. The PWM output (VOUT) is adjusted between 30% and 100%, based on the voltage at VIN. The PWM duty cycle can also be programmed via SMBus to allow fan speed control without the need for an external thermistor. If VIN is not connected, the TC654 will start driving the fan at a default duty cycle of 39.33%. In normal fan operation, pulse trains are present at SENSE1 (Pin 8) and SENSE2 (Pin 7). The TC654 use these pulses to calculate the fan revolutions per minute (RPM). The fan RPM data is used to detect a worn out, stalled, open or unconnected fan. An RPM level below the user-programmable threshold causes the TC654 to assert a logic low alert signal (FAULT). The default threshold value is 500 RPM. Also, if this condition occurs, F1F (bit 0<0>) or F2F (bit 1<0>) in the Status Register will also be set to a ‘1’. An over-temperature condition is indicated when the voltage at VIN exceeds 2.6 V (typical). The TC654 devices indicate this by setting OTF(bit 5) in the Status Register to a '1'. The TC654 devices are available in a 10-Pin MSOP package and consume 150 μA during operation. The devices can also enter a low-power shutdown mode (5 μA, typ.) by setting the appropriate bit in the Configuration Register. The operating temperature range for these devices is -40°C to +85°C.

Key Features

  • Temperature Proportional Fan Speed for Reduced Acoustic Noise and Longer Fan Life
  • FanSense™ Protects against Fan Failure and Eliminates the Need for 3-wire Fans
  • Efficient PWM Fan Drive
  • Provides RPM Data
  • 2-Wire SMBus™-Compatible Interface
  • Supports Any Fan Voltage
  • Software Controlled Shutdown Mode for "Green" Systems
  • Supports Low Cost NTC/PTC Thermistors
  • Space Saving 10-Pin MSOP Package
  • Temperature Range: -40°C to +85°C

Technical Attributes

Description
Value
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Product Dimensions
3 x 3 x 0.85 mm
MSL Level
1
Type
High Speed PWM Controller
Lead Finish
Matte Tin
Supplier Package
MSOP
Pin Count
10
Operating Temperature
-40 to 85 °C
Number of Outputs
1
Mounting
Surface Mount
Max Processing Temp
260
Output Current
5 mA

ECCN / UNSPSC

Description
Value
ECCN:
EAR99
SCHEDULE B:
8542390000"
HTSN:
8542390001"
UNSPSC:
32101600
UNSPSC VERSION:
V15.1101

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