ENN8349 D

Ordering number : ENN8349
LA6584M
Monolithic Linear IC
BTL Driver Single-Phase Full-Wave
Fan Motor Driver
http://onsemi.com
Overview
The LA6584M is Single-phase bipolar fan motor is put into silent driving by means of BTL output linear drive, offering
high efficiency and power saving by suppressing the reactive current. Lock protection and rotation signal (FG, RD)
circuits are built in, ensuring optimum application to small fans for notebook PC, consumer equipment power supply,
car audio system, CPU cooler, etc. that require high reliability and low noise.
Functions and Applications
• Single-phase full-wave driver for fan motor
Specitications
Absolute Maximum Ratings at Ta = 25 °C
Parameter
Output voltage
Allowable dissipation
Symbol
Conditions
Ratings
Unit
VCC max
Pd max
Mounted on a specified board*
15
V
1.5
W
Output current
IOUT max
1.6
A
Output withstand voltage
VOUT max
15
V
RD/FG output pin output
VRD/FG max
15
V
IRD/FG max
5
mA
IB max
10
mA
Withstand voltage
RD/FG output current
HB output voltage
Operating temperature
Topr
-30 to +90
°C
Storage temperature
Tstg
-55 to +150
°C
*Mounted on a specified board (114.3×76.1×1.6mm, Glass epoxy)
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating
Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability.
Recommended Operating Range at Ta = 25 °C
Parameter
Symbol
Conditions
Ratings
Unit
Supply voltage
VCC
2.8 to 14.0
V
Common-phase input voltage
VICM
0 to VCC-1.5
V
Range of Hall input
Semiconductor Components Industries, LLC, 2013
May, 2013
92706 / 62005 MS PC No.8349-1/5
LA6584M
Electrical Characteristics at Ta = 25 °C, VCC = 12 V, unless especially specified.
Parameter
Symbol
Ratings
Conditions
min
Circuit current
typ
Unit
max
ICC1
During drive (CT = L)
4
6
9
mA
ICC2
During lock protection (CT = H)
2
4
6
mA
Lock detection capacitor charge current
ICT1
2.0
2.8
3.5
μA
Capacitor discharge current
ICT2
0.15
0.23
0.30
μA
Capacitor charge and discharge current ratio
RCT
9
12
15
-
CT charge voltage
VCT1
1.6
1.7
1.8
V
CT discharge voltage
VCT2
0.6
0.7
0.8
V
OUT output L saturation voltage
VOL
IO = 200 mA
0.2
0.3
V
OUT output H saturation voltage
VOH
IO = 200 mA
0.9
1.2
V
Hall input sensitivity
VHN
Zero peak value
7
15
mV
RD/FG output pin L voltage
VRD/FG
0.1
0.2
V
1
30
μA
1.5
1.7
V
RCD = ICT1/ICT2
(including offset and hysteresis)
IRD/FG = 5 mA
RD/FG output pin leak current
IRD/FGL
VRD/FG = 15 V
HB output L voltage
VHBL
IHB = 5 mA
1.3
Package Dimensions
unit : mm
3097B
No.8349-2/5
LA6584M
Truth Table
IN-
IN+
CT
OUT1
H
L
L
H
L
H
L
-
-
OFF
OFF
-
H
OUT2
FG
RD
Mode
L
L
L
During rotation
H
H
H
During overheat protection
Pin Assignment
F-GND
F-GND
IN+
(NC)
HB
RD
IN-
FG
(NC)
(NC)
LA6584M
CT
VCC
(NC)
(NC)
OUT1
OUT2
GND
(NC)
F-GND
F-GND
Top view
No.8349-3/5
LA6584M
Sample Application Circuit
Di
Cr
*4
*1
VCC
R2
FG
HB
H
*2
RD
OUT1
IN-
HB
OUT2
IN+
R2
*5
*6
CT
GND
R1
*3
H
IN-
On board element
IN+
*1
*2
*3
*4
*5
When Di to prevent breakdown in case of reverse connection is used, it is necessary to insert a capacitor Cr to
secure the regenerative current route. Similarly, Cr is necessary to enhance the reliability when there is no
capacitor near the fan power line.
To obtain Hall bias from VCC, carry out 1/2×VCC bias as shown in the figure. Linear driving is made through
voltage control of the coil by amplifying the Hall output. When the Hall element output is large, the startup
performance and efficiency are improved. Adjustment of the Hall element can reduce the noise further.
When the Hall bias is taken from the HB pin, constant-voltage bias is made with about 2.0 V. Therefore, the Hall
element can provide the output satisfactory in temperature characteristics. Adjustment of the Hall output
amplitude is made with R1. (When VCC = 12 V, the step *2 above proves advantageous for IC heat generation.)
Keep this open when not used.
When the wiring from the Hall output to IC Hall input is long, noise may be carried through the wiring.
In this case, insert the capacitor as shown in the figure.
No.8349-4/5
LA6584M
Internal Equivalent Circuit
VCC
1.5VRG
HB
H
IN+
OUT1
OUT2
IN-
GND
FG
Control
Circuit
Charge/discharge circuit
RD
Discharge
pulse
CT=0.47 to 1µF
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PS No.8349-5/5
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