Datasheet
For Fan Motor Driver
Fractional Pulse Rate Converter
(Conversion Ratio, 21:12)
BU6823G
General Description
This IC converts the input clock signal by 12/21 ratio and
output it. It is the best when need to output the FG signal
equivalent to the 8-pole motor when using the 14-pole
motor with the FG signal generated from the Hall sensor
signals.
Key Specifications
Input Frequency Range:
Driver Output Current:
Maximum Junction Temperature:
5 Hz to 5 kHz
±5 mA (Max)
+125 °C
Package
Features
5V Power Supply
Conversion Ratio, 21:12
Input Frequency Range: 5 Hz to 5 kHz
Small Package, SSOP5
SSOP5
W(Typ) x D(Typ) x H(Max)
2.90 mm x 2.80 mm x 1.25 mm
Applications
Air Conditioners; Air Purifiers
SSOP5
Typical Application Circuit
VCC
IN
OUT
Figure 1. Application Circuit Example
〇Product
structure : Silicon monolithic integrated circuit
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〇This
product has no designed protection against radioactive rays
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Contents
General Description ........................................................................................................................................................................ 1
Features.......................................................................................................................................................................................... 1
Applications .................................................................................................................................................................................... 1
Key Specifications .......................................................................................................................................................................... 1
Package
.................................................................................................................................................................................. 1
Typical Application Circuit ............................................................................................................................................................... 1
Contents ......................................................................................................................................................................................... 2
Block Diagram and Pin Configuration ............................................................................................................................................. 3
Pin Description................................................................................................................................................................................ 3
Description of Blocks ...................................................................................................................................................................... 3
Absolute Maximum Ratings .......................................................................................................................................................... 4
Thermal Resistance ........................................................................................................................................................................ 4
Recommended Operating Conditions ........................................................................................................................................... 5
Electrical Characteristics................................................................................................................................................................. 5
Typical Performance Curves (Reference Data) .............................................................................................................................. 6
Timing Chart ................................................................................................................................................................................... 8
I/O Equivalence Circuits.................................................................................................................................................................. 8
Operational Notes ........................................................................................................................................................................... 9
Ordering Information ..................................................................................................................................................................... 10
Marking Diagram .......................................................................................................................................................................... 10
Physical Dimension and Packing Information ............................................................................................................................... 11
Revision History ............................................................................................................................................................................ 12
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Block Diagram and Pin Configuration
VCC
VCC
5
GND (1)
UVLO
VREG
OSC
(5) VCC
GND (2)
IN
4
PULSE RATE CONVERTER
LOGIC
3
OUT
OUT (3)
1
GND
(4) IN
2
Figure 2. Block Diagram
Figure 3. Pin Configuration
(Top View)
Pin Description
Pin
1
2
3
Name
GND
GND
OUT
Ground
Ground
Converted signal output
Function
Pin
5
-
4
Name
VCC
-
IN
Power supply
-
Signal input pin
Function
Description of Blocks
1. Pulse Rate Conversion Logic
It divides the input clock signal by 12/21, and output the converted signal. Signal processing is performed with reference
to the fall edge of the input signal.
In addition, when the input signal frequency is out of range at signal conversion and it is judged to be too low frequency,
the internal logic circuit outputs no conversion signal (pass through). On the other hand, when it is judged to be too high
frequency, it outputs 35 kHz (Typ) signal.
2. Signal Input Pin
The IN pin is pulled up to VCC internally by a 500 kΩ (Typ) resistor. When using in conjunction with the open-collector /
drain output, the IN pin can be connected directly.
3. Signal Output Pin
The OUT pin is CMOS output. When connecting to the base pin of a bipolar transistor, please do not exceed the rated
current by taking countermeasure such as inserting a current limiting resistor.
4. Under Voltage Lock Out (UVLO) Circuit
To secure the lowest power supply voltage necessary to operate the internal circuit, and to prevent under voltage
malfunctions, an UVLO circuit is built into the internal circuit. When the power supply voltage falls to V
UVL
and below, the
internal circuit forces output low. When the voltage rises to V
UVH
and above, the UVLO circuit ends the lock out operation
and returns to normal operation.
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Absolute Maximum Ratings
(Tj=25 °C)
Parameter
Supply Voltage
Input Voltage
Maximum Input Frequency
Driver Outputs
Storage Temperature Range
Maximum Junction Temperature
Symbol
V
CC
V
IN
f
INMAX
I
OMAX
Tstg
Tjmax
Rating
7.0
(Note 1)
-0.3 to V
CC
10
±5
(Note 1)
-55 to +125
125
Unit
V
V
kHz
mA
°C
°C
(Note)
All voltages are with respect to ground unless otherwise specified.
(Note 1)
Do not exceed ASO.
Caution 1:
Operating the IC over the absolute maximum ratings may damage the IC. The damage can either be a short circuit between pins or an open circuit
between pins and the internal circuitry. Therefore, it is important to consider circuit protection measures, such as adding a fuse, in case the IC is
operated over the absolute maximum ratings.
Caution 2:
Should by any chance the maximum junction temperature rating be exceeded the rise in temperature of the chip may result in deterioration of the
properties of the chip. In case of exceeding this absolute maximum rating, design a PCB with thermal resistance taken into consideration by
increasing board size and copper area so as not to exceed the maximum junction temperature rating.
Thermal Resistance
(Note 2)
Parameter
SSOP5
Junction to Ambient
Junction to Top Characterization Parameter
(Note 3)
θ
JA
Ψ
JT
376.5
40
185.4
30
°C/W
°C/W
Symbol
Thermal Resistance (Typ)
1s
(Note 4)
2s2p
(Note
5)
Unit
(Note 2)
Based on JESD51-2A(Still-Air).
(Note 3)
The thermal characterization parameter to report the difference between junction temperature and the temperature at the top center of the outside
surface of the component package.
(Note 4)
Using a PCB board based on JESD51-3.
(Note 5)
Using a PCB board based on JESD51-7.
Layer Number of
Measurement Board
Single
Top
Copper Pattern
Footprints and Traces
Layer Number of
Measurement Board
4 Layers
Top
Copper Pattern
Footprints and Traces
Material
FR-4
Board Size
114.3 mm x 76.2 mm x 1.57 mmt
Thickness
70 μm
Material
FR-4
Board Size
114.3 mm x 76.2 mm x 1.6 mmt
2 Internal Layers
Thickness
70 μm
Copper Pattern
74.2 mm x 74.2 mm
Thickness
35 μm
Bottom
Copper Pattern
74.2 mm x 74.2 mm
Thickness
70 μm
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Recommended Operating Conditions
(Tj=25 °C)
Parameter
Supply Voltage
Junction Temperature
Input Frequency Range
Input Signal Duty Range
Symbol
V
CC
Tj
f
IN
F
DUTY
Min
4.5
-40
5
15
Typ
5.0
-
-
-
Max
5.5
+110
5k
85
Unit
V
°C
Hz
%
(Note)
All voltages are with respect to ground unless otherwise specified.
Electrical Characteristics
(Unless otherwise specified V
CC
=5 V and T
j
=25 °C)
Parameter
Power Supply
Quiescence Current
Input
Input Bias Current
Input High Voltage
Input Low Voltage
Output
Output High Voltage
Output Low Voltage
Under Voltage Lock Out
Release Voltage
Lockout Voltage
V
UVH
V
UVL
3.3
2.7
3.6
3.0
3.9
3.3
V
V
V
OUTH
V
OUTL
V
CC
-0.40
0
V
CC
-0.08
0.02
V
CC
0.30
V
V
I
O
=-2 mA
I
O
=2 mA
I
IN
V
INH
V
INL
6
2.0
0
10
-
-
15
V
CC
0.8
µA
V
V
V
IN
=0 V
I
CCQ
0.3
0.46
1.0
mA
V
IN
=0 V
Symbol
Min
Typ
Max
Unit
Conditions
(Note)
All voltages are with respect to ground unless otherwise specified.
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