UNISONIC TECHNOLOGIES CO.,
F6908 LINEAR INTEGRATED CIRCUIT
SINGLE-PHASE FULL-WAVE MOTOR DRIVER FOR FAN MOTOR
DESCRIPTION
SOP-8UTC F6908 is a single-phase full-wave motor driver for fan motor suitable for 5V and 12V openations.
FEATURES
* Soft switching drive for low noise
* Lock detection and automatic restart function * Thermal shut-down protection
*Pb-free plating product number: F6908L
PIN DESCRIPTION
PIN PIN
FUNCTION
NO.NAME
1 OUT2Output 2 2 HO Hall signal output pin
Capacitor terminal for Lock
3 LD detection, Auto restart
4 VCC Power supply pin 5 H+ Hall signal input pin + 6 H- Hall signal input pin - 7 OUT1Output 1 8 GNDGROUND
ORDERING INFORMATION
Order Number
Package Packing Normal Lead Free Plating
F6908-S08-R F6908L-S08-R SOP-8 Tape Reel F6908-S08-T F6908L-S08-T SOP-8 Tube
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Copyright © 2005 Unisonic Technologies Co.,
1
QW-R109-016.B
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F6908 LINEAR INTEGRATED CIRCUIT
BLOCK DIAGRAM
1REG8MLOCKDETECTIONAND RESTART27OUT 2OUT 13CS+-+-TSDControl6HALLHALLAMP-+54
HALL SIGNAL INPUT-OUTPUT TRUTH TABLE
H+ H- OUT1 OUT2 HO H L H L H L H L H L Condition: LD=0V
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F6908 LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATINGS (Ta=25℃)
PARAMETER SYMBOL RATINGS UNIT Supply Voltage VCC 15 V Output Voltage VOUT 15 V Hall Signal Output Voltage VHO 15 V Output Current IOUT 0.7* A Hall Signal Output Current IHO 15 mA Power Dissipation PD 680 ** mW Operating Temperature TOPR -40 ~ +100 ℃ Junction Temperature TJ +125 ℃ Storage Temperature TSTG -40 ~ +150 ℃ * This value is not to be over PD and ASO.
** To use at temperature above Ta = 25℃ reduce 5.5 mW/℃.(On 70.0mm×70.0mm×1.6mm glass epoxy board) The device is guaranteed to meet performance specification within 0℃ ~ 70℃ operating temperature range and assured by design from –40℃ ~ 100℃, characteristic and correlation with static process control.
RECOMMENDED OPERATING CONDITIONS (Ta=25℃)
PARAMETER SYMBOL Supply Voltage VCC
RATINGS 3 ~ 14
UNIT V
ELECTRICAL CHARACTERISTICS (Unless otherwise specified Ta = 25℃, Vcc = 5V)
PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT
Clamp Voltage of Capacitor for
VLDCL 1.141.80 2.47 V Lock Detection
Reference Voltage of Capacitor
VLDCP 0.470.76 1.06 V for Lock Detection Output Voltage L VOL IOUT=200mA 0.2 0.3 V Output Voltage H VOH IOUT=200mA 3.9 4.1 V “HO” Terminal Voltage L VHOL IHO=5mA 0.3 0.5 V Supply Current Icc At output: OFF 1.5 3.4 8.7 mA Charge Current of Capacitor for
ILDC VLD=1.1V 1.502.75 4.50 µA Lock Detection
Discharge Current of Capacitor
ILDD VLD=1.1V 0.240.48 0.90 µA for Lock Detection
“HO” Terminal Leak Current IHOL VHO=15V 0 50 µA Charge-Discharge Current Ratio
RCD rCD=ILDC/ILDD 4.2 5.7 9.5 of Capacitor for Lock Detection Hall Input Offset Voltage HOFS -10 10 mV Hall Input-Output Gain GHO 320 500 680 Thermal Shutdown 140 ℃ TSD Hysteresis TSD 25 ℃
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F6908 LINEAR INTEGRATED CIRCUIT
POWER DERATING CURE
PD (mW)1000800687600400200025507585100125150Ta (℃)
To use at temperature above Ta=25℃ reduce 5.5mW/℃(On 70.0mm×70.0mm×1.6mm glass epoxy board)
LOCK DETECT CIRCUIT, AUTOMATIC RESTART CIRCUIT
Charge and discharge time at motor lock condition varies with the value of external capacitor at LD terminal, and is given by the following equation.
C×(VLDCL-VLDCP) TON (Charge time) =
ILDC
C×(VLDCL-VLDCP)
TOFF (Discharge time)= ILDD
C: Capacitor at LD pin
The following value shows charge time and discharge time at C=0.47µF for reference. Charge time =0.18S (Output: ON)
Discharge time = 1.02S (Output: OFF)
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F6908 LINEAR INTEGRATED CIRCUIT
SHOWS TIMING CHART OF LD PIN
H+OUT1TOFFVLDCLLDVLDCPHOMotorDetectlocklockFig.1 Timing chart (LD terminal, HO terminal)Depend on the hall outputLockcancelReset ordinarymotionOutput Tr OFFTONON
CAUTIONS
(1) Power dissipation
IC power dissipation varies widely with supply voltage, output current and application of IC. Please pay attention not to exceed the allowable power rating.
(2) Hall signal input terminals (H+、H-)
Hall Amp input bias voltage rangeVCCVCC-2V1/2 VCCGNDFig.2 Hall amp input bias voltage range
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F6908 LINEAR INTEGRATED CIRCUIT
A. Hall signal amplitude should be key within range 0V ~ VCC-2V.
B. The output signal of this IC is the amplified by about 500 times of hall input signal coith pattern shown below for different leuel ok signal input.
(H+)-(H-)OUT1Fig.3 Difference of output signal depending on hall input signal
UTC assumes no responsibility for equipment failures that result from using products at values thatexceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, orother parameters) listed in products specifications of any and all UTC products described or containedherein. UTC products are not designed for use in life support appliances, devices or systems wheremalfunction of these products can be reasonably expected to result in personal injury. Reproduction inwhole or in part is prohibited without the prior written consent of the copyright owner. The informationpresented in this document does not form part of any quotation or contract, is believed to be accurateand reliable and may be changed without notice. www.unisonic.com.tw QW-R109-016.B UNISONIC TECHNOLOGIES CO., LTD 6
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