ON LA6581DM Fan motor driver Datasheet

Ordering number : ENA2264
LA6581DM
Monolithic Linear IC
Fan Motor Driver
http://onsemi.com
BLT Driver Single-Phase
Full-Wave
Overview
The LA6581DM is a low-saturation BTL output linear
driving motor driver for single-phase bipolar fan motors.
It features quite, low power, high efficiency drive that
suppresses reactive current. It is optimal for use in
applications that require miniaturization and low noise,
such as CPU cooling fan motors and 5 to 12V electronic
game products.
Micro8
Functions
• Single-phase full-wave linear drive with BTL output (gain resistance 500Ω to 284kΩ, 55dB) : Suitable for the
equipment requiring silent operation, such as game equipment, CPU cooler, etc. because of its freedom from
switching noise.
• Low-voltage operation possible, with wide operable voltage range (2.2 to 16V)
• Low saturation output (Upper + lower saturation voltage : VOsat (total) = 0.3V typ, IO = 100mA) : High coil
efficiency with low current drain. IC itself does not generate much heat.
• High impedance of Hall input pin
• FG output (rotation speed detection output : open collector output)
• Heat protection circuit : When the large current flows because of output short-circuit, raising the IC chip temperature
above 180°C, the heat protection circuit suppresses the drive current, preventing IC burn and breakdown.
• Extra-small package (Micro8)
Small substrate while allowing larger blades
Specifications
Maximum Ratings at Ta = 25°C
Parameter
Symbol
Conditions
Ratings
Unit
Output voltage
VCC max
18
V
Allowable power dissipation
Pd max
Output current
IOUT1 max
Mounted on a specified board *1
400
mW
*2
0.36
IOUT2 max
T<200ms
0.50
A
A
V
Output withstand voltage
VOUT max
18
FG output withstand
VFG max
18
V
FG output current
IFG max
5
mA
Operating temperature
Topr
-30 to +100
°C
Storage temperature
Tstg
-55 to +150
°C
*1: Mounted on a board (20.0mm 10.0mm 0.8mm: Paper Phenol, wiring density 20%)
*2: This specifies the starting current. Tj=15°C max must not be exceeded..
Caution 1) Absolute maximum ratings represent the value which cannot be exceeded for any length of time.
Caution 2) Even when the device is used within the range of absolute maximum ratings, as a result of continuous usage under high temperature, high current,
high voltage, or drastic temperature change, the reliability of the IC may be degraded. Please contact us for the further details.
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.
ORDERING INFORMATION
See detailed ordering and shipping information on page 5 of this data sheet.
Semiconductor Components Industries, LLC, 2014
January, 2014
10814NK 20131203-S00001 No.A2264-1/5
LA6581DM
Recommended Operating Conditions at Ta = 25°C
Parameter
Symbol
Supply voltage
VCC
Common-phase input voltage range of
VICM
Conditions
Ratings
Unit
2.2 to 16
V
0.3 to VCC-1.5
V
Hall input
Electrical Characteristics at Ta = 25°C, VCC = 12.0V, unless especially specified.
Ratings
Parameter
Symbol
Conditions
Unit
min
Typ
Max
Circuit Current
ICC
IN- = 5.8V, IN+ = 6.0V, RL = ∞
14
19
mA
OUT output low voltage
VOL
IO = 100mA
0.1
0.2
V
OUT output high voltage
VOH
IO = 100mA
0.1
0.2
V
Hall bias voltage
VHB
RH = 360Ω +91Ω
1.85
1.95
2.05
V
Hall amplifier gain
Vg
52
55
58
dB
Hall amplifier input current
VINR
FG output low voltage
VFG
IFG = 3mA
FG output leakage current
IFGL
VFG = 7V
Thermal protection circuit
Th
* Design guarantee
-10
150
-2
+10
μA
0.2
0.3
V
30
μA
180
200
°C
*: These values are design guarantee values, and are not tested.
Truth Table
IN-
IN+
OUT1
H
L
H
L
L
L
H
L
H
Off
-
-
Off
Off
-
OUT2
FG
mode
During rotation
During overheat protection
Pd-Ta
500
Pd max -- Ta
400
With specified board
300
200
160
100
0
90
120
No.A2264-2/5
LA6581DM
Package Dimensions
unit : mm (typ)
Micro8
CASE 846A-02
ISSUE J
Pin Assignment
Micro8
IN+ 1
8 FG
HB 2
7 VCC
6 OUT2
3
OUT1 4
5 GND
Top view
No.A2264-3/5
LA6581DM
Block Diagram
VCC
FG
2.0VRG
HB
IN+
H
OUT1
OUT2
IN-
GND
Timing Chart
Hall Signal
OUTPUT
Coil Current
FG Pulse
No.A2264-4/5
LA6581DM
Application Circuit Example
Di
Cr
*4
VCC
*1
R2
LA6581DM
*2
HB
FG
HB
H
*3
H
OUT1
IN+
IN+
OUT2
*5
R2
R1
GND
Elements in substrate
*1 : 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.
*2 : 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.
*3 : When the Hall bias is taken from the HB pin, constant-voltage bias is made with about 2.0V. Therefore, the Hall
element can provide the output satisfactory in temperature characteristics. Adjustment of the Hall output
amplitude is made with R1. (When VCC = 12V, the step *2 above proves advantageous for IC heat generation.)
*4 : Keep this open when not used.
*5 : 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.
ORDERING INFORMATION
Device
LA6581DMR2G
Package
Micro8
(Pb-Free / Halogen Free)
Shipping (Qty / Packing)
4000 / Tape & Reel
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PS No.A2264-5/5
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