UTC F2967 For variable speed fan motor single-phase full-wave pre-driver Datasheet

UNISONIC TECHNOLOGIES CO., LTD
F2967
Preliminary
LINEAR INTEGRATED CIRCUIT
FOR VARIABLE SPEED FAN
MOTOR SINGLE-PHASE
FULL-WAVE PRE-DRIVER

DESCRIPTION
The UTC F2967 is a single-phase fan motor pre-driver IC.
This IC has variable speed function that works with an external
Pulse-Width Modulation signal. A quiet and low power
consumption motor driver circuit can be implemented by adding a
small number of external components.
This IC is optimal for driving large scale fan motors (with large
air volume and large current) such as those used in servers and
consumer products.

TSSOP-20
FEATURES
* Single-phase full-wave drive
* Variable speed control with External PWM input
* Current limiter circuit
* Reactive current cut circuit
* Compatible with 12V, 24V, and 48V power supplies
* Minimum speed setting pin
* Reference voltage output pin for Hall bias
* automatic reset and Lock protection functions incorporated
* (Rotation speed detection), RD (Lock detection) output

ORDERING INFORMATION
Ordering Number
Lead Free
F2967L-P20-T
F2967L-P20-R
Halogen Free
F2967G-P20-T
F2967G-P20-R
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Copyright © 2013 Unisonic Technologies Co., Ltd
Package
Packing
TSSOP-20
TSSOP-20
Tube
Tape Reel
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Preliminary
LINEAR INTEGRATED CIRCUIT
PIN CONFIGURATION
OUT2P
1
20 OUT1P
OUT2N
2
19 OUT1N
VCC
3
18 VOVER
VLIM
4
17 SGND
SENSE
5
RMI
6
VTH
7
14 CT
CPWM 8
13 IN+
FG 9
12 HB
RD 10
11 IN-
UTC
F2967
16 6VREG
15 ROFF
PIN DESCRIPTION
PIN NO.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
PIN NAME
OUT2P
OUT2N
VCC
VLIM
SENSE
RMI
VTH
CPWM
FG
RD
INHB
IN+
CT
ROFF
6VREG
SGND
VOVER
OUT1N
OUT1P
DESCRIPTION
Output2P
Output2N
Power supply
Setting limit current pin
Sense pin of current limiter
Lowest speed setting voltage
Variable speed function input
PWM oscillator frequency setting capacitor
Speed detection output
lock detection output
The hall sensor input
Power the hall sensor 1.25V
The hall sensor input
Setting lock protection time
The pin sets soft switching time
VREF 6V
Logic GND
The pin for constant VCC voltage
Output2P
Output2N
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Preliminary
LINEAR INTEGRATED CIRCUIT
BLOCK DIAGRAM
FG
RD
Discharge circuit
CT
Discharge pulse
VCC
6VREG
OUT1N
6VREG
OUT1P
ROFF
HB
Controller
Hall-Bias
Hysteresis AMP
IN+
OUT2N
IN-
OUT2P
Osc
OTP
RMI VTH CPWM
VLIM SENSE
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SGND
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Preliminary
LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATING (TA=25°C)
PARAMETER
SYMBOL
RATINGS
UNIT
Maximum Supply Voltage VCC
VCC max
18
V
Maximum Output Current
IOUT max
50
mA
Output Withstand Voltage
VOUT max
18
V
HB Maximum Output Current
HB
10
mA
VTH Input Pin Withstand Voltage
VTH max
8
V
RD/FG Output Pin Output Withstand Voltage
FG max
18
V
RD/FG Output Current
FG max
10
mA
Allowable Power
Mounted on a specified board (Note 2)
Pd max
800
mW
Dissipation
Operating Temperature
TOPR
-30~+95
°C
Storage Temperature
TSTG
-55~+150
°C
Notes: 1. Absolute maximum ratings are those values beyond which the device could be permanently damaged.
Absolute maximum ratings are stress ratings only and functional device operation is not implied.
2. Mounted on a specified board (114.3mm×76.1mm×1.6mm, Glass epoxy)

RECOMMENDED OPERATING RANGE (TA=25°C)
PARAMETER
SYMBOL
VCC
VTH
VICM
VCC Supply Voltage
VTH Input Level Voltage Range Full Speed Mode
Hall Input Common Phase Input Voltage Range

RATINGS
6~16
0~7
0.2~3
UNIT
V
V
V
ELECTRICAL CHARACTERISTICS (TA=25°C, VCC=12V, unless otherwise specified)
PARAMETER
Circuit Current
6VREG Voltage
VOVER Voltage
CPWM-H Voltage
CPWM-L Voltage
CPWM Oscillation Frequency
CT Pin H Voltage
CT Pin L Voltage
ICT Pin Charge Current
ICT Pin Discharge Current
ICT Charge/Discharge Current Ratio
OUT-N Output Voltage
OUT-P Sink Current
SYMBOL
ICC1
ICC2
6VREG
VOVER
VCRH
VCRL
FPWM
VCTH
VCTL
ICT1
ICT2
RCT
VON
IOP
Sensitivity of Hall Input
VHN
RD/FG Output Pin L Voltage
RD/FG Output Pin Leak Current
VFG
IFGL
TEST CONDITIONS
During Drive
During Lock Protection
I6VREG=5mA
C=100pF
IO=20mA
Zero Peak Value (Including
Offset and Hysteresis)
IFG=5mA
VFG=16V
UNISONIC TECHNOLOGIES CO., LTD
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MIN
6
6
5.80
12.0
4.35
1.45
18
3.4
1.4
1.6
0.16
8
4
15
TYP
10
10
6.0
12.8
4.55
1.65
25
3.6
1.6
2.0
0.20
10
10
20
MAX
14
14
6.15
13.6
4.75
1.85
32
3.8
1.8
2.5
0.28
12
UNIT
mA
mA
V
V
V
V
kHz
V
V
μA
μA
deg
V
mA
10
20
mV
0.15
0.3
30
V
μA
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Preliminary
LINEAR INTEGRATED CIRCUIT
TRUTH TABLE
During full-speed rotation
ININ+
CT
H
L
L
L
H
H
L
H
L
H
VTH
CPWM
L
H
H
L
OUT1P OUT1N OUT2P OUT2N
L
H
H
L
OFF
H
H
OFF
INH
L
H
L
IN+
L
H
L
H
OUT1P
L
OFF
-
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OUT1N
H
H
FG
L
OFF
L
OFF
OUT2P
L
OFF
RD
L
OFF
-
Mode
OUT1→2 drive
OUT2→1 drive
Lock Protection
-
OUT2N
H
H
-
Mode
OUT1→2 drive
OUT2→1 drive
During Rotation
Regeneration in Lower TR
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LINEAR INTEGRATED CIRCUIT
CONTROL TIMING CHART
(1) Minimum speed setting (stop) mode
Input of PWM-IN is filtered to generate the VTH voltage. At low speed, the fan rotates with the minimum speed set
with RMI pin during low speed. If the minimum speed is not set (RMI=6VREG), the fan stops.
(2) Low ⇔ High speed mode
PWM control is made through comparison of oscillation and VTH voltages with CPWM changing between
1.6V ⇔ 4.6V.
When the VTH voltage is lower, the IC switches to drive mode. When the VTH voltage is higher, the p-channel
FET is turned off and coil current is regenerated through the low-side FET. Therefore, as the VTH voltage lowers,
the output ON-DUTY increases, increasing the coil current and raising the motor speed.
The rotation speed is fed back by the FG output.
(3) Full speed mode
The full-speed mode becomes effective with the VTH voltage of 1.65V or less. (VTH must be equal to GND when
the speed control is not to be made.)
(4) PWM-IN input disconnection mode
While the input pin of PWM-IN is disconnected, VTH becomes 1.65V or les and the output enables full drive at
100%. The fan runs at full speed. (Refer to the sample application circuit.)
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Preliminary
LINEAR INTEGRATED CIRCUIT
TYPICAL APPLICATION CIRCUIT
12V Sample Application Circuit
CB=to 0.022µF
RB=10kΩ
VZ=18V
ROUT=100Ω
SOP8901
RF
RFG, RRD=10kΩ~100kΩ
VCC
VOVER
RD
FG
HALL
6VREG
HB
SENSE
IN-
VLIM
IN+
6VREG
ROFF
RMI
R=0~5kΩ
OUT1P
VTH
OUT1N
CP=100pF
PWM-IN
25kHz
OUT2P
CPWM
OUT2N
CT
CT=0.47µF
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SGND
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Preliminary
LINEAR INTEGRATED CIRCUIT
TYPICAL APPLICATION CIRCUIT(Cont.)
24V, 48V Sample Application Circuit
RF
VCC
VOVER
RD
FG
HB
HALL
6VREG
SENSE
IN-
VLIM
IN+
6VREG
RMI
ROFF
OUT1P
VTH
PWM-IN
OUT1N
CP=100pF
OUT2P
CPWM
OUT2N
CT
CT=0.47µF
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SGND
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Preliminary
LINEAR INTEGRATED CIRCUIT
UTC assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or
other parameters) listed in products specifications of any and all UTC products described or contained
herein. UTC products are not designed for use in life support appliances, devices or systems where
malfunction of these products can be reasonably expected to result in personal injury. Reproduction in
whole or in part is prohibited without the prior written consent of the copyright owner. The information
presented in this document does not form part of any quotation or contract, is believed to be accurate
and reliable and may be changed without notice.
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