SITI FD178B Built-in hall sensor input signal amplifier Datasheet

FD178A/FD178B/FD178C
Version
: A.010
Issue Date: 2011/3/1
File Name : SP-FD178-A.010.doc
Total Pages: 10
Single Coil Brushless DC Motor Drivers with
Soft-Switching and PWM control
( 2 to 6.5 Volts )
SILICON TOUCH TECHNOLOGY INC.
新竹市科學園區展業一路九號七樓之一
9-7F-1 Prosperity Road I Science-Based Industrial Park
Hsinchu, Taiwan 300, R.O.C.
Tel:886-3-5645656 Fax:886-3-5645626
FD178A/FD178B/FD178C
General Specifications
Designed for rotation speed control of single coil DC brushless fans, the FD178
series motor drivers minimize external component count and integrate all the key features
required for high efficiency and low noise fans. Specifically PWM control and soft
switching are provided to control the rotation speed and reduce the audible noise.
Internal circuit protection includes thermal shutdown with hysteresis, rotor lock protection,
and reverse power polarity protection. Three frequency generation (FGR pin) options are
provided for different fan configurations - FG (FGR signal following Hall sensor output
frequency), FG/2 (divided by two version of FG), and RD (rotation detection) for FD178A,
FD178B, and FD178C respectively.
Features and Benefits
z
Support single-phase full wave Brushless DC Motor Driver
z
Built-in Hall sensor input signal amplifier
PWM control circuit
Low voltage startup (VDD=2V)
High driving capability
Lock detection and automatic self-restart
Power polarity reverse protection
Thermal shut down protection circuit
z
Thin, compact, highly reliable package (TSOT-28)
z
z
z
z
z
z
Pin Description
FD178A/FD178B/FD178C:TSOT-28
O1
VSS
FGR
HP
O2
TSOT
VDD
PWM
HN
Package : TSOT-28
NO. NAME
DESCRIPTION
1
O1
Output driving & sinking pin 1
2
VSS
Ground pin
Frequency generator or rotating detector
FD178:FG
3
FGR
FD178B:FG/2
FD178C:RD
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
Version:A.010
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Page:1
FD178A/FD178B/FD178C
Absolute Maximum Ratings
( Unless otherwise noted, VDD=5V, TA = 25 °C )
Characteristic
Symbol
Rating
Unit
Supply Voltage
VDDM
6.5
V
Operation Current
IOUT
500
mA
Output Current at Locked (TSOT-28)
IOL1
1
A
Maximum FGR Output Current
IFGR_MAX
10
mA
Maximum FGR Output Voltage
VFGR_MAX
6.5
V
Operating Temperature Range
TOPR
-30 ~ 85
°C
Storage Temperature Range
TSTG
-65 ~ 150
°C
Power Dissipation (TSOT-28)
PD
568
mW
Thermal Resistance, Junction to Ambient
θJA_TSOT28
220
°C/ W
Thermal Resistance, Junction to Case
θJC_TSOT28
92
°C/ W
Tj(max)
150
°C
Maximum Junction Temperature
Single Coil Brushless DC Motor Drivers with Soft-Switching and PWM control
Version:A.010
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Page:2
FD178A/FD178B/FD178C
Electrical Characteristics
( Unless otherwise noted, VDD=5V, TA = 25 °C )
Limit
Characteristic
Sym.
Condition
Unit
Min.
Typ.
Max.
2
5
6.5
V
3
5
mA
Operation Voltage
VDD
-
Supply Current
Maximum Output
Voltage Range
Minimum Output
Voltage Range
Icc
-
VOH
IOUT = 250 mA
4.5
4.65
-
V
VOL
IOUT = 250 mA
-
0.35
0.5
V
FG Output
Low Voltage
VFGROL
IFGR= 5 mA
-
0.25
0.4
V
Hall Amplifier Offset
VOffSet
-
-9
0
9
mV
GIO
-
45
48
51
dB
TON
TOFF
-
110
0.75
150
1.05
190
1.35
ms
Sec
PWM input frequency
VPWM
-
-
25
50
KHZ
PWM input high level
voltage*1
VIH
-
VIL
-
-0.3
0
0.2VDD
V
VDC
-
400
-
-
mV
VAm
-
150
-
-
mV
Input-Output Gain
Automatic self-restart
Lock detection on Time
Lock detection off Time
PWM signal control
PWM input low level
voltage*1
Hall signal output
Hall average output DC
voltage
Hall amplitude of
waveform voltage
*1
0.55VDD VDD VDD+0.4
V
Description in the page4 “PWM input high and low level voltage”
Single Coil Brushless DC Motor Drivers with Soft-Switching and PWM control
Version:A.010
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Page:3
FD178A/FD178B/FD178C
Thermal shut down protection circuit
Shut down temperature
-
160
180
200
℃
Release temperature
-
120
140
160
℃
Truth Table
PWM
Hall input
O1
O2
L
X
L
L
H
HP > HN
H
L
H
HP < HN
L
H
O1, O2
VDD
VPWM
VIL,max
VIH,min
Single Coil Brushless DC Motor Drivers with Soft-Switching and PWM control
Version:A.010
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Page:4
FD178A/FD178B/FD178C
Hall Signal
For a stable operation, the Hall sensor output is required to meet the following
conditions.
(a) The DC level of Hall signal is greater than 400 mV
(b) The amplitude of Hall signal is greater than 150mV
HP or HN
VAmplitude
+
VDC
-
Application Circuit
The connection of the capacito between VDD and GND will increase stability of operation, if
required.
Single Coil Brushless DC Motor Drivers with Soft-Switching and PWM control
Version:A.010
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Page:5
FD178A/FD178B/FD178C
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
Version:A.010
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Page:6
FD178A/FD178B/FD178C
Application Notes
The device can be operated with a wide supply voltage ranging from 2
to 6.5 Volts.
However, the design, specifications, and performance have been optimized for 5V
brushless dc motor applications.
The output driver node O1/O2 are in drive/sink state when V(HP) > V(HN) and vice
versa
The lock and auto-restart do not require an external capacitor for a timing counting
purpose. The driver will be shutdown approximately 1 second after the motor is lock
and the auto-restart is activated every one second until the lock is released.
Eliminating an external protection diode, a power polarity reverse circuit is integrated
on the chip.
A 1uF capacitor between VDD and GND as well as a 0.1uF between HP and HN are
strongly recommended for a reliable and noise immune operation.
The power dissipated by the chip varies with the supply voltage. It is advisable to ensure the
power dissipation by the chip does not exceed the thermal requirement dictated by the package.
The maximum allowable power consumption can be calculated by the following equation:
Pd ( Power Dissipation)(Watt ) =
Tj ( Junction Temperature)(max)(oC ) − Ta ( Ambient Temperature)(oC )
θ JA (Thermal Re sis tan ce, Junction to Ambient )(oC / Watt )
The relationship between power dissipation and operating temperature can refer to the figure
below:
Single Coil Brushless DC Motor Drivers with Soft-Switching and PWM control
Version:A.010
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Page:7
FD178A/FD178B/FD178C
Package Specifications
FD178 : TSOT-28
80× × G
80××G :FD178A
8B××G :FD178B
8C××G :FD178C
×× 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
θ
0o
4o
8o
θ1
4o
10o
12o
Single Coil Brushless DC Motor Drivers with Soft-Switching and PWM control
Version:A.010
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Page:8
FD178A/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.
Silicon Touch Technology, Inc. reserve the right to make changes to their
products or to discontinue any product or service without notice, and advise
customers to obtain the latest version of relevant information to verify, before
placing orders, that information being relied on is current and complete.
Single Coil Brushless DC Motor Drivers with Soft-Switching and PWM control
Version:A.010
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Unauthorized reproduction, duplication, use or disclosure of this document will be deemed as infringement.
Page:9
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