BD6721FS Datasheet PDF - Rohm

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BD6721FS
Rohm

Part Number BD6721FS
Description Multifunction Single-phase Full-wave Fan Motor Driver
Page 17 Pages


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Datasheet
DC Brushless Fan Motor Drivers
Multifunction Single-phase Full-wave
Fan Motor Driver
BD6721FS
General description
BD6721FS is a 1chip driver that composes H-bridge of
power DMOS FET.
Moreover, because the level amplifier is installed, the
temperature control by the thermistor is also easy.
Package
SSOP-A16
W (Typ.) x D (Typ.) x H (Max.)
6.60mm x 6.20mm x 1.71mm
Features
„ Driver including power DMOS FET
„ Speed controllable by DC / direct PWM input
„ PWM soft switching
„ Quick start
„ Current limit
„ Lock protection and automatic restart
„ Rotation speed pulse signal (FG) output
„ Lock alarm signal (AL) output
SSOP-A16
Application
„ Fan motors for general consumer equipment of desktop PC, and Projector, etc.
Absolute maximum ratings
Parameter
Symbol
Limit
Supply voltage
Power dissipation
Vcc 20
Pd 812.5 *1
Operating temperature range
Topr –40 to +100
Storage temperature range
Tstg –55 to +150
Output voltage
Output current
Vo 20
Io 1.0 *2
Rotation speed pulse signal (FG) output voltage
Vfg
20
Rotation speed pulse signal (FG) output current
Ifg
10
Lock alarm signal (AL) output voltage
Val 20
Lock alarm signal (AL) output current
Ial 10
Reference voltage (REF) output current
Iref
8
Junction temperature
Tj 150
*1 Reduce by 6.5mW/°C over Ta=25°C. (On 70.0mm×70.0mm×1.6mm glass epoxy board)
*2 This value is not to exceed Pd.
Unit
V
mW
°C
°C
V
A
V
mA
V
mA
mA
°C
Recommended operating conditions
Parameter
Operating supply voltage range
Operating input voltage range
(H+, H–, TH, MIN, LAIN) (more than Vcc=9V)
Operating input voltage range
(H+, H–, TH, MIN, LAIN) (less than Vcc=9V)
Symbol
Vcc
Vin
Limit
4.5 to 17.0
0 to 7
0 to Vcc–2
Unit
V
V
V
Product structureSilicon monolithic integrated circuit
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© 2012 ROHM Co., Ltd. All rights reserved.
TSZ2211114001
This product is not designed protection against radioactive rays
1/13
TSZ02201-0H1H0B100170-1-2
28.JUL.2012 Rev.002



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BD6721FS
Datasheet
Pin configuration
GND
OSC
LAOUT
LAIN
TH
MIN
OUT1
RNF
1
2
3
4
5
6
7
8
(TOP VIEW)
16 AL
15 FG
14 REF
13 H–
12 H+
11 Vcc
10 CS
9 OUT2
Fig.1 Pin configuration
Block diagram
Pin description
P/No. T/Name
1 GND
2 OSC
3 LAOUT
4 LAIN
5 TH
6 MIN
7 OUT1
8 RNF
9 OUT2
10 CS
11 Vcc
12 H+
13 H–
14 REF
15 FG
16 AL
Function
Ground terminal (signal ground)
Oscillating capacitor connecting
terminal
Level amplifier output terminal
Level amplifier input terminal
Output duty controllable input terminal
Minimum output duty setting terminal
Motor output terminal 1
Output current detecting resistor
connecting terminal (motor ground)
Motor output terminal 2
Output current detection terminal
Power supply terminal
Hall + input terminal
Hall – input terminal
Reference voltage output terminal
Speed pulse signal output terminal
Lock alarm signal output terminal
1 GND
TSD
PWM SOFT
SWITCHING
SIGNAL
OUTPUT
AL 16
2 OSC
OSC
LA
3 OUT
PWM
COMP
LA
IN
4
PWM
COMP
CONTROL
LOGIC
5
TH
LEVEL
AMP
6 MIN
7 OUT1
QUICK
START
PRE-
DRIVER
8 RNF
SIGNAL
OUTPUT
FG 15
REF REF 14
H AL L
AMP
H AL L
COMP
LOCK
PROTECT
H– 13
H+ 12
Vcc 11
Vcl
CS 10
CURRENT
LIMIT COMP
OUT2 9
I/O truth table
Hall input
Driver output
H+ H– OUT1 OUT2
HL LH
L HH
H; High, L; Low, Hi-Z; High impedance
FG output is open-drain type.
L
Fig.2 Block diagram
FG
Hi-Z
L
Motor state
AL
Rotating
L
Locking
Hi-Z
L; Low, Hi-Z; High impedance
AL output is open-drain type.
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© 2012 ROHM Co., Ltd. All rights reserved.
TSZ2211115001
2/13
TSZ02201-0H1H0B100170-1-2
28.JUL.2012 Rev.002



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BD6721FS
Datasheet
Electrical characteristics(Unless otherwise specified Ta=25°C, Vcc=12V)
Parameter
Limit
Symbol
Unit
Min. Typ. Max.
Conditions
Circuit current
Icc 4 7 10 mA
Hall input hysteresis voltage
Vhys
±5 ±10 ±15 mV
Output voltage
Io=±300mA,
Vo
- 0.6 0.9
V
High and low side total
Lock detection ON time
Ton
0.3 0.5 0.7
s
Lock detection OFF time
Toff
3.0 5.0 7.0
s
FG output low voltage
Vfgl - 0.15 0.30 V Ifg=5mA
FG output leak current
Ifgl - - 10 µA Vfg=17V
AL output low voltage
Vall - 0.15 0.30 V Ial=5mA
AL output leak current
Iall - - 10 µA Val=17V
OSC high voltage
Vosch
2.3 2.5 2.7
V
OSC low voltage
Voscl
0.8 1.0 1.2
V
OSC charge current
Icosc
–50 –32 –26 µA
OSC discharge current
Idosc
26 32 50 µA
Level amplifier gain
Gla 50 - - dB
Level amplifier output high voltage Vlaoh
- 1.6 2.0
V For Vcc voltage
Level amplifier output low voltage Vlaol
- 0.2 0.3
V
Output ON duty 1
Poh1
85 90 95
Vth=Vref x 0.383
% Output 1k, OSC=470pF
Output ON duty 2
Poh2
45 50 55
Vth=Vref x 0.583
% Output 1k, OSC=470pF
Output ON duty 3
Poh3
5 10 15
Vth=Vref x 0.783
% Output 1k, OSC=470pF
Reference voltage
Vref
2.8 3.0 3.2
V Iref=–2mA
Current limit setting voltage
Vcl 290 310 330 mV
TH input bias current
Ith - - –0.2 µA Vth=0V
MIN input bias current
Imin - - –0.2 µA Vmin=0V
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
Fig.3
Fig.4
Fig.5 to 8
Fig.9
Fig.10
Fig.11, 12
Fig.13
Fig.11, 12
Fig.13
Fig.14
Fig.14
Fig.15
Fig.15
Fig.16, 17
Fig.18
Fig.19
-
-
-
Fig.20, 21
Fig.22
Fig.23
Fig.24
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© 2012 ROHM Co., Ltd. All rights reserved.
TSZ2211115001
3/13
TSZ02201-0H1H0B100170-1-2
28.JUL.2012 Rev.002



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BD6721FS
Typical performance curves(Reference data)
Datasheet
10
8
6
4
2
0
0
25°C
100°C
–40°C
Operating range
5 10 15
Supply voltage: Vcc[V]
Fig.3 Circuit current
20
20
10
0
-10
-20
0
100°C
25°C
–40°C
Operating range
–40°C
25°C
100°C
5 10 15
Supply voltage: Vcc[V]
Fig.4 Hall input hysteresis voltage
20
0.0 0.0
-0.2 -0.2
-0.4 -0.4
-0.6 –40°C
25°C
-0.8
-1.0
0.0
100°C
0.1 0.2 0.3 0.4 0.5 0.6
Output source current: Io[A]
0.7
Fig.5 Output high voltage (Vcc=12V)
-0.6 17V
12V
-0.8
-1.0
0.0
5V
0.1 0.2 0.3 0.4 0.5 0.6
Output source current: Io[A]
Fig.6 Output high voltage (Ta=25°C)
0.7
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© 2012 ROHM Co., Ltd. All rights reserved.
TSZ2211115001
4/13
TSZ02201-0H1H0B100170-1-2
28.JUL.2012 Rev.002



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