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FD178/FD178B/FD178C
Version : A.005 Issue Date : 2009/09/11 File Name : SP-FD178-A.005.doc Total Pages : 10
Single Coil Brushless DC Motor Drivers with Soft-Switching and PWM control ( 2.0 to 6.5 Volts )
9 7 1
SILICON TOUCH TECHNOLOGY INC.
9-7F-1, Prosperity Road I, Science Based Industrial Park, Hsin-Chu, Taiwan 300, R.O.C. Fax886-3-5645626 Tel886-3-5645656
FD178/FD178B/FD178C General Specifications
The device is a single coil DC brushless motor driver IC with soft-switch, PWM control, locked protection, thermal shut down protection circuit, power polarity reverse protection, frequency generator FG output for FD178, FG/2 output for FD178B, and rotating detector RD output for FD178C. The driver is optimal for single coil fan applications with less external components.
Features and Benefits
Support single-phase full wave Brushless DC Motor Driver Built-in Hall sensor input signal amplifier PWM control circuit Low voltage startup (VDD=2.0V) High driving capability Lock detection and automatic self-restart Power polarity reverse protection Thermal shut down protection circuit Thin, compact, highly reliable package (TSOT-28)
Pin Description
FD178/FD178B/FD178CTSOT-28
Package : TSOT-28 NO. NAME DESCRIPTION 1 O1 Output driving & sinking pin 1 2 VSS Ground pin Frequency generator or rotating detector FD178FG 3 FGR FD178BFG/2 FD178CRD 4 5 6 7 8 HP HN PWM VDD O2 Hall sensor in+ Hall sensor inPWM control pin Power supply pin Output driving & sinking pin 2
Single Coil Brushless DC Motor Drivers with Soft-Switching and PWM control( 2.0 to 6.5 Volts )
VersionA.005
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FD178/FD178B/FD178C Absolute Maximum Ratings
( Unless otherwise noted, VDD=5V, TA = 25 C ) Characteristic Supply Voltage Output Current Output Current at Locked (TSOT-28) Maximum FGR Output Current Maximum FGR Output Voltage Operating Temperature Range Storage Temperature Range Power Dissipation (TSOT-28) Thermal Resistance, Junction to Ambient Thermal Resistance, Junction to Case Symbol VDDM IOUT IOL1 IFGR_MAX VFGR_MAX TOPR TSTG PD JA_TSOT28 JC_TSOT28 Rating 6.5 500 1 10 6.5 -30 ~ 85 -65 ~ 150 568 220 92 Unit V mA A mA V C C mW C/ W C/ W
Single Coil Brushless DC Motor Drivers with Soft-Switching and PWM control( 2.0 to 6.5 Volts )
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FD178/FD178B/FD178C Electrical Characteristics
( Unless otherwise noted, VDD=5V, TA = 25 C ) Limit Characteristic Sym. Condition Min. Operation Voltage Supply Current Maximum Output Voltage Range Minimum Output Voltage Range FG Output Low Voltage Hall Amplifier Offset Input-Output Gain Automatic self-restart Lock detection on Time Lock detection off Time PWM signal control PWM input frequency PWM input high level voltage PWM input low level voltage Hall signal output Hall average output DC voltage Hall amplitude of waveform voltage VDC VAmplitude 400 20 mV mV VPWM VIH VIL
-
Unit Typ. 5 3 4.5 -9 45 4.65 0.35 0.25 0 48 Max. 6.5 5 0.5 0.4 9 51 V mA V V V mV dB
VDD Icc VOH VOL VFGROL VOffSet GIO
IOUT = 300 mA IOUT = 300 mA IFGR= 3 mA -
2
TON TOFF
-
110 0.75
150 1.05
190 1.35
ms Sec
-
25 -
50 VDD
KHZ V V
-
2 VDD 3
0
1 VDD 3
Single Coil Brushless DC Motor Drivers with Soft-Switching and PWM control( 2.0 to 6.5 Volts )
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FD178/FD178B/FD178C Truth Table
PWM L H H Hall input X HP > HN HP < HN O1 L H L O2 L L H
O1, O2 VDD
VPWM VIL VIH
Hall Signal
In order to let FD178 normal work, two output signals of the Hall must satisfy the following two conditions
(a) Hall average output DC voltage, VDC>400mV (b) Hall amplitude of waveform voltage, VAmplitude>20mV
HP or HN
VAmplitude VDC
Single Coil Brushless DC Motor Drivers with Soft-Switching and PWM control( 2.0 to 6.5 Volts )
VersionA.005
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FD178/FD178B/FD178C Application Circuit
VDD VDD Power Frequency Generator Rotating Detector 10K ohm FGR
1K ohm
PWM
HP 5V 1uF Hall Sensor 0.1uF HN VSS GND AMP Logic Block O1 Soft-Switching Drivers O2 Coil
OSC
Output Waveform
PWM HP HN
O1 O2
PWM control
PWM HP HN
O1 O2
Single Coil Brushless DC Motor Drivers with Soft-Switching and PWM control( 2.0 to 6.5 Volts )
VersionA.005
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FD178/FD178B/FD178C Thermal Shutdown
The FD178 provides a temperature error detection circuit, once the temperature reaches approximately above 122oC, shutdown signal will cause the driver to shutdown all the outputs.
Normal -10 (3)
122
Shutdown
+10 (3)
Application Notes
The device is operated within wide supply voltage range from 2.0 to 6.5 Volts. The design, specifications and performance have been optimized for 5V brushless DC motor applications. The output driver node O1/O2 will be "turned to drive/sink" when V(HP) > V(HN). Similarly, the output O1/O2 will be "turned to sink/drive" when V(HP) < V(HN).
The output frequency on FGR pin is the same frequency with hall switching for FD178, dividing the hall switching frequency with 2 for FD178B, and the rotating detection for FD178C. There is no need of external timing capacitor for lock protection and auto-restart function. For 5V application, the drivers will be shut down roughly 1 second after the motor is locked. When the drivers have been shut down, the automatic self-restart circuit will try to power up the drivers every 1 second until lock is released.
Single Coil Brushless DC Motor Drivers with Soft-Switching and PWM control( 2.0 to 6.5 Volts )
VersionA.005
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FD178/FD178B/FD178C
There is no requirement of protection diode for power reverse fault in normal applications. The power polarity reverse protection circuit is built-in. The connection of the capacitor 1uF between VDD and GND and the capacitor 0.1uF between Hall sensor HP and HN will increase the system stability when motor is rotating. The power dissipated by the IC varies widely with the supply voltage, the output current, and loading. It is important to ensure the application does not exceed the allowable power dissipation of the IC package. The recommended motor driver power dissipation versus temperature is depicted as follows:
Single Coil Brushless DC Motor Drivers with Soft-Switching and PWM control( 2.0 to 6.5 Volts )
VersionA.005
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FD178/FD178B/FD178C Package Specifications FD178 : TSOT-28
x x G
80xxG FD178 8BxxG FD178B 8CxxG FD178C
xx is the run code. G is Green.
VARIATION(ALL DIMENSIONS SHOWN IN MM) SYMBOL MIN. NOM. MAX. A 0.750 0.800 A1 0 0.050 A2 0.700 0.750 0.775 b 0.220 0.380 c 0.100 0.200 D 2.800 2.900 3.000 E 2.600 2.800 3.000 E1 1.500 1.600 1.700 e 0.650 BSC e1 1.950 BSC L 0.370 0.450 0.600 L1 0.600 REF L2 0.250 BSC R 0.100 R1 0.100 0.250 0o 4o 8o o o 1 4 10 12o
Single Coil Brushless DC Motor Drivers with Soft-Switching and PWM control( 2.0 to 6.5 Volts )
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FD178/FD178B/FD178C
The products listed herein are designed for ordinary electronic applications, such as electrical appliances, audio-visual equipment, communications devices and so on. Hence, it is advisable that the devices should not be used in medical instruments, surgical implants, aerospace machinery, nuclear power control systems, disaster/crime-prevention equipment and the like. Misusing those products may directly or indirectly endanger human life, or cause injury and property loss. Silicon Touch Technology, Inc. will not take any responsibilities regarding the misusage of the products mentioned above. Anyone who purchases any products described herein with the above-mentioned intention or with such misused applications should accept full responsibility and indemnify. Silicon Touch Technology, Inc. and its distributors and all their officers and employees shall defend jointly and severally against any and all claims and litigation and all damages, cost and expenses associated with such intention and manipulation.
Single Coil Brushless DC Motor Drivers with Soft-Switching and PWM control( 2.0 to 6.5 Volts )
VersionA.005
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