TC648B _ BDTIC a Leading Distributor in China

TC648B

The TC648B is a new version of the existing TC648 fan speed controller. This device is a switch mode fan speed controller, which incorporates a new fan auto restart function. Temperature proportional speed control is accomplished using pulse width modulation. A thermistor (or other voltage output temperature sensor) connected to the VIN input supplies the required control voltage of 1.20V to 2.60V (typical) for 0% to 100% PWM duty cycle. The auto-shutdown speed is set by a simple resistor divider on the VAS input. An integrated Start-Up Timer ensures reliable fan motor start-up at turn-on, coming out of shutdown mode, auto-shutdown mode, or following a transient fault. A logic low applied to VIN, pin 1, causes fan shutdown. The OTF signal is asserted if the PWM reaches 100% duty cycle, indicating that maximum cooling capability has been reached and a possible thermal runaway condition exists.

Features

Temperature Proportional Fan Speed for Acoustic Control and Longer Fan Life
Over-Temperature Indication
Efficient PWM Drive
Automatic Shutdown Mode for "Green" Systems
3.0V to 5.5V Supply Range
Fan Voltage Independent of Supply Voltage – Supports Any Fan Voltage
Supports Low Cost NTC/PTC Thermistors

Parameter

Parameter Name Value	Value
Device Description Fan Manager	Fan Manager
Typical Accuracy (°C) Depends on External Thermistor	Depends on External Thermistor
Over Temp Alert yes	yes
Max. Supply Current (µA) 400	400
Max. Accuracy @ 25°C (°C) Depends on External Thermistor	Depends on External Thermistor
External Temp Input Yes	Yes
Auto Shutdown Yes	Yes
High/Low PWM Freq Low	Low
Temp Range (°C) -40 to +85	-40 to +85
Vcc Range (V) +3.0 to +5.5	+3.0 to +5.5

Documents

TC646B/TC648B/TC649B Datasheet	Data Sheets	02/05/2013	552KB
AN770 - Linear Voltage Fan Speed Control Using Microchip?s TC64x Family (TC642, TC646, TC648)	AppNote	07/27/2004	203KB
AN771 - Suppressing Acoustic Noise in PWM Fan Speed Control Systems	AppNote	07/27/2004	276KB
TB063 - An Integrated Fan Speed Control Solution Can Lower System Costs, Reduce Acoustic Noise, Power Consumption and Enhance System Reliability	AppNote	02/24/2003	204KB
Analog & Interface Guide (Volume 2)	Brochures	10/11/2005	1067KB
Quick Guide to Microchip Development Tools	Brochures	10/15/2014	11223KB
Fan Control Function Pack Design Guide	Product Line Documents	08/23/2006	162KB
Fan Management Solutions Product Overview	Product Line Documents	08/23/2006	87KB
Fan Speed Controller and Fan Fault Detector Family	Product Line Documents	05/13/2003	245KB
Analog & Interface Product Selector Guide	Product Line Card	03/21/2016	4116KB
8-Pin SOIC/MSOP/TSSOP/DIP Evaluation Board User's Guide	User Guides	01/24/2006	1367KB
TC64X/TC64XB Fan Control Evaluation Board User's Guide	User Guides	11/24/2003	360KB
Thermistor Value Calculator with Solver for the TC64x Family	User Guides	11/24/2003	130KB
Thermistor Value Calculator without Solver for the TC64x Family	User Guides	11/24/2003	107KB

Ordering Information

Part Number	Leads	Package Type	Temp Range	Packing	1+	26+	100+	1000+	5000+
TC648BEOA	8	SOIC	-40C to +85C	TUBE	1.09	0.91	0.82	0.80	0.79
TC648BEOA713	8	SOIC	-40C to +85C	T/R	1.09	0.91	0.82	0.80	0.79
TC648BEPA	8	PDIP	-40C to +85C	TUBE	1.23	1.02	0.93	0.90	0.89
TC648BEUA	8	MSOP	-40C to +85C	TUBE	1.13	0.94	0.86	0.83	0.82
TC648BEUA713	8	MSOP	-40C to +85C	T/R	1.13	0.94	0.86	0.83	0.82

Similar Devices

Product	Description	Typical Accuracy (º)	Temp Range	Price5K
EMC2101		±0.5	-40 - +125	$0.79
EMC2300		±0.25	0 - 70	$1.24
EMC6D102		±0.25	0 - 70	$1.63
EMC6D103		±0.25	0 - 70	$1.80
EMC6D103S		±0.25	0 - 70	$1.80
EMC6W201		±0.25	0 - 70	$2.19
TC642	Fan Manager	Depends on external thermistor	-40 - +85	$1.02
TC642B	Fan Manager	Depends on external thermistor	-40 - +85	$0.84
TC646	Fan Manager	Depends on external thermistor	-40 - +85	$1.02
TC646B	Fan Manager	Depends on external thermistor	-40 - +85	$0.84
TC647	Fan Manager	Depends on external thermistor	-40 - +85	$0.94
TC647B	Fan Manager	Depends on external thermistor	-40 - +85	$0.84
TC648	Fan Manager	Depends on external thermistor	-40 - +85	$0.85
TC648B	Fan Manager	Depends on External Thermistor	-40 - +85	$0.79
TC649	Fan Manager	Depends on external thermistor	-40 - +85	$0.94
TC649B	Fan Manager	Depends on external thermistor	-40 - +85	$0.84
TC650	Fan Manager	1	-40 - +125	$1.26
TC651	Fan Manager	1	-40 - +125	$1.08
TC652	Fan Manager	1	-40 - +125	$1.36
TC653	Fan Manager	1	-40 - 125	$1.36
TC654	Dual SMBus Fan Manager	Depends on external thermistor	-40 - +85	$1.43
TC655	Dual SMBus Fan Manager	Depends on external thermistor	-40 - +85	$1.53
TC664	Single SMBus Fan Manager	Depends on external thermistor	-40 - +85	$1.27
TC665	Single SMBus Fan Manager	Depends on external thermistor	-40 - +85	$1.31
TC670	Predictive Fan Fault Detector	N/A	-40 - +85	$0.94

RoHS Information

PartNumber	DeviceWeight	ShippingWeight	LeadCount	PackageType	PackageWidth	SolderComposition	JEDECIndicator
TC648BEPA	0.486700	0.900000	8	PDIP	.300in	Matte Tin	e3
TC648BEOA	0.078000	0.160000	8	SOIC	.150In(3.90mm)	Matte Tin	e3
TC648BEOA713	0.078000	0.230303	8	SOIC	.150In(3.90mm)	Matte Tin	e3
TC648BEUA	0.025600	0.070000	8	MSOP	3x3mm	Matte Tin	e3
TC648BEUA713	0.025600	0.215600	8	MSOP	3x3mm	Matte Tin	e3