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Datasheet
DC Brushless FAN Motor Drivers
Three-phase Full-wave
Fan Motor Driver
BD6346FV
General Description
BD6346FV is a three phase, sensorless motor 1chip driver
with integrated power DMOS MOSFETs. Its feature is
sensor-less drive which doesn’t require a hall device as a
location detection sensor. Furthermore, introducing a PWM
soft switched driving mechanism achieves silent
operations and low vibrations.
Features
„ Integrated Power DMOS FET driver
„ Sensorless PWM soft switched drive
„ Lock protection and automatic restart
„ DC voltage/direct PWM input ,speed control
„ Current limit
„ Soft-Start function
„ Quick-Start function
„ Rotating speed pulse signal(FG)output
„ UVLO
Package(s)
SSOP-B20
W (Typ.) x D (Typ.) x H (Max.)
6.50mm x 6.40mm x 1.45mm
SSOP-B20
Applications
„ Refrigerator, Sever, Desktop, cooling Fan for general
consumer equipment
Absolute maximum ratings
Parameter
Supply voltage
Power dissipation
Operating temperature
Storage temperature
Output voltage
Output Current
FG signal output voltage
FG signal output current
REF current ability
Symbol
VCC
Pd
Topr
Tstg
Vomax
Iomax
VFG
IFG
IREF
Limit
20
1200*1
-40 to +100
-55 to +150
20
1.2*2
20
10
8
Input voltage 1 (COM)
Vin1 20
Input voltage2 (CONT, MIN, SS, OSC, TOSC, SEL) Vin2
6.5
Junction temperature
Tjmax
150
*1 Reduce by 9.6mW/°C, over Ta=25°C (on 70.0mm×70.0mm×1.6mm glass epoxy board)
*2 This value is not exceed Pd and ASO
Recommended operating conditions
Parameter
supply voltage range
Input voltage (CONT)
Input voltage (MIN)
Input frequency (CONT, OSC=GND setting)
Symbol
Vcc
Vcont
Vmin
Fcont
Limit
5.5 to 17.0
0 to Vref
Voscl to Vref
20 to 50
Unit
V
mW
V
A
V
mA
mA
V
V
°C
Unit
V
V
V
kHz
Product structure Silicon monolithic integrated circuit
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© 2013 ROHM Co., Ltd. All rights reserved.
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This product is not designed for protection against radioactive rays
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BD6346FV
Pin Configuration(s)
GND 1
GND 2
GND 3
SS 4
REF 5
CONT 6
MIN 7
SEL 8
U9
RNF 10
(TOP VIEW)
20 GND
19 GND
18 GND
17 FG
16 OSC
15 TOSC
14 COM
13 Vcc
12 W
11 V
Fig. 1 Pin configuration
Block diagram
Datasheet
Pin description
P/No. T/Name
Function
1 GND GND terminal (signal GND)
2 GND GND terminal (signal GND)
3 GND GND terminal (signal GND)
4
SS
Soft-Start capacitor connecting
terminal
5 REF Reference voltage terminal
6 CONT Output duty control terminal
7
MIN
Minimum rotating speed setting
terminal
8 SEL Output slope current select terminal
9 U Motor output U terminal
10
RNF
Output current detecting terminal
(Motor GND)
11 V Motor output V terminal
12 W Motor output W terminal
13 Vcc Power Supply terminal
14 COM Motor central tap terminal
15
TOSC
Oscillating capacitor connecting
terminal for synchronous driving
16
OSC
Oscillating capacitor connecting
terminal for output PWM operation
17
FG
Rotating speed pulse signal output
terminal
18 GND GND terminal (signal GND)
19 GND GND terminal (signal GND)
20 GND GND terminal (signal GND)
GND pin is shorted all GND pin (1-3, 18-20) on board
GND 1
GND 2
GND 3
SS 4
TSD
LOCK
PROTECT
UVLO
QUICK
START
Vcl
SOFT START
& CURRENT
LIMIT
COMP
150° SOFT
SWITCH
SIGNAL
OUTPUT
20 GND
19 GND
18 GND
17 FG
REF 5
REF
CONT 6
MIN 7
SEL 8
REF
PWM
COMP
CONTROL
LOGIC
PRE DRIVER
OSC
16 OSC
TOSC
BEMF
DETECT
DET.
COMP
DETECT
LEVEL
15 TOSC
14 COM
13 Vcc
U9
Vcc
Vcc
Vcc
12 W
RNF 10
11 V
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© 2013 ROHM Co., Ltd. All rights reserved.
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Fig. 2 Block diagram
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BD6346FV
Datasheet
Electrical characteristics(Unless otherwise specified Ta=25°C, Vcc=12V)
Parameter
Symbol
Limit
Min. Typ. Max.
Unit
Min.
Conditions
Typ.
Circuit current
Icc 3.6 6 8.4 mA
<REF>
REF voltage
Vref 4.65 5.00 5.35 V Iref=–2mA
<TOSC>
TOSC high voltage
Vtosch 2.3 2.5 2.7
V
TOSC low voltage
Vtoscl 0.80 1.05 1.20 V
TOSC Charge current
Ictosc
–80 –60 –40 µA
TOSC Discharge current
Idtosc
40 60 80
µA
<CONT, MIN>
CONT input high voltage
Vconth 2.8 -
-
V Vosc=0V
CONT input low voltage
Vcontl
-
- 1.0
V Vosc=0V
CONT input bias current
Icont
- - –1 µA
CONT input frequency
Fcont
20 - 50 kHz
MIN input bias current
Imin - - –1 µA
<OSC>
OSC High voltage
Vosch
2.3 2.5 2.7
V
OSC Low voltage
Voscl
0.80 1.05 1.20 V
OSC Charge current
Icosc
–40 –30 –20 µA
OSC Discharge current
Idosc
20 30 40 µA
<Current Limit>
Current limit voltage
Vcl 200 250 300 mV
<Soft-Start>
SS charge current
Icss 1.35 1.9 2.45 µA Vss=0V
<FG>
FG output Low voltage
Vfgl
- 0.3 0.4
V Ifg=5mA
FG output leak current
Ifgl - - 10 µA Vfg=20V
<Lock protection>
Lock detect ON time
Ton
0.5 1 1.5
s TOSC_CAP=1000pF
Lock detect OFF time
Toff
2.5 5 7.5
s
<Output>
Output high voltage
Vohh
- 0.15 0.20 V Io=–200mA,for VCCvoltage
Output low voltage
Voll - 0.09 0.16 V Io=+200mA
About a current item,define the inflow current to IC as a positive notation, and the outflow current from IC as a negative notation.
Ref.
data
P.4
P.4
P.4
P.4
P.5
P.5
-
-
P.6
-
P.6
P.6
P.6
P.6
P.6
P.7
P.7
P.5
P.5
-
-
P.7
P.8
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BD6346FV
Typical performance curves(Reference data)
100°C
25°C
-40°C
Datasheet
100°C
25°C
-40°C
Operating range
Fig. 3 Circuit current
100°C
25°C
-40°C
Fig. 5 REF voltage current ability (Vcc=12V)
Operating range
Fig. 4 REF voltage
100°C
25°C
-40°C
Operating range
100°C
25°C
-40°C
Fig. 6 TOSC High/Low voltage
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BD6346FV
Typical performance curves(Reference data)
100°C
25°C
-40°C
Operating range
-40°C
25°C
100°C
Fig. 7 TOSC charge/discharge current
Datasheet
100°C
25°C
-40°C
Fig. 8 FG low voltage (Vcc=12V)
17V
12V
5.5V
Fig. 9 FG low voltage (Ta=25 )
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Operating range
100°C
25°C
-40°C
Fig. 10 FG leak current
TSZ02201-0H1H0B100520-1-2
17.Jun.2013 Rev.001