ENA2088 D

Ordering number : ENA2088
LA6585FA
Monolithic Linear IC
BTL Drive Single-Phase Full-Wave
Fan Motor Driver
http://onsemi.com
Overview
The LA6585FA is a single-phase bipolar fan motor driver that achieves quite operation, power savings, silent operation
and high efficiency that suppresses reactive current through BTL output linear drive. It provides lock protection and
rotation signal circuits on chip, and is optimal for applications that require high reliability and low noise, such as
notebook personal computers, power supplies in consumer electronic equipment, car audio, and CPU cooling systems.
Features
• BTL output single-phase full-wave linear drive (gain resistor : 1 to 360kΩ, 51dB)
• Supports low-voltage drive and features a wide usable voltage range (2.2 to 14.0V)
• Low saturation output (high side + low side saturation voltage : Vosat (total) = 1.2V (typical), IO = 250mA)
• Built-in lock protection and automatic return circuits
• Built-in FG output
• Built-in Hall sensor bias (VHB = 1.5V)
• Thermal protection circuit
• Small-sized, high thermal capacity package
Specifications
Absolute Maximum Ratings at Ta = 25°C
Parameter
Symbol
Conditions
Ratings
Unit
Supply voltage
VCC max
15
V
Output current
IOUT max
0.5
A
Output voltage
VOUT max
15
V
VFG max
15
V
10
mA
400
mW
FG output pin oiutput withstand
voltage
FG output current
Allowable power dissipation
IFG max
Pd max
1
When mounted on a circuit board *
Operating temperature
Topr
-30 to +90
°C
Storage temperature
Tstg
-55 to +150
°C
*1 Specified circuit board : 114.3 × 76.1 × 1.6mm3, paper phenol.
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.
Semiconductor Components Industries, LLC, 2013
May, 2013
70412 SY 20120619-S00001 No.A2088-1/4
LA6585FA
Recommended Operating Conditions at Ta = 25°C
Parameter
Symbol
Conditions
Ratings
Unit
Supply voltage
VCC
2.2 to 14.0
V
Common-phase input voltage
VICM
0 to VCC -1.5
V
range of hall input
Electrical Characteristics at Ta = 25°C, VCC = 12V, Unless otherwise specified.
Parameter
Symbol
Ratings
Conditions
min
Circuit current
Lock detection capacitor charge
ICC1
Drive mode (CT = low)
ICC2
Lock protection mode (CT = high)
typ
6
9
mA
2.5
5
7.5
mA
0.9
1.2
1.5
μA
0.10
0.18
0.25
μA
5
6.5
8
1.3
1.5
1.7
3
ICT1
Unit
max
current
Capacitor discharge current
ICT2
Capacitor charge/discharge current
RCT
RCD = ICT1/ICT2
ratio
CT charge voltage
VCT1
CT discharge voltage
VCT2
0.5
0.7
V
OUT output low saturation voltage
VOL
IO = 200mA
0.25
0.45
V
OUT output high saturation voltage
VOH
IO = 200mA
0.95
1.2
V
Hall input sensitivity
VHN
7
15
mV
0.3
Zero peak value (including offset and
V
hysteresis)
FG output pin low-level voltage
VFG
IFG = 5mA
0.15
0.3
V
FG output pin leakage current
IFGL
VFG = 15V
1
30
μA
Package Dimensions
unit : mm (typ)
3427
3.0
1 2
0.65
0.18
0.08
1.1 MAX
0.33
Allowable power dissipation, Pd max – mW
0.55
4.9
3.0
8
500
Pd max – Ta
Specified circuit board : 114.3×76.1×1.6mm3
paper phenol
400
300
200
192
100
0
– 30
0
30
60
90
120
Ambient temperature, Ta – °C
SANYO : Micro8
No.A2088-2/4
LA6585FA
Truth Table
IN−
IN+
CT
OUT1
OUT2
FG
High
Low
Low
High
Low
Low
Low
High
Low
High
High
−
−
Off
Off
−
High
Mode
During rotation
Lock protection
Pin Assignment
IN+
1
8
FG
IN-
2
7
VCC
CT
3
6
OUT2
OUT1
4
5
GND
Top view
Application Circuit Example
Di
Cr
*3
*1
VCC
*FG
R2
H
IN-
OUT1
IN+
OUT2
*2
R2
*4
CT
GND
On board element
*1.
If the diode Di (which protects the IC destruction by reverse connection) is used, it is necessary to insert the capacitor Cr
and provide a regenerative current route. Similarly, if there is no nearby capacitor on the fan power supply line, Cr will
also be necessary to improve reliability.
*2.
If the Hall sensor bias is taken from VCC, a 1/2 VCC bias, as shown in the figure, must be used.
Linear drive is implemented by amplifying the Hall sensor output and applying voltage control to the coil. If the Hall
effect sensor provides a strong output, the startup characteristics and efficiency will be good, then even quieter operation
will be achieved by adjusting the Hall effect sensor.
*3.
This pin must be left open if unused.
*4.
If the line from the Hall sensor output to the Hall sensor input of IC are long, noise may enter the system from that line.
If that becomes a problem, insert a capacitor as shown in the figure.
No.A2088-3/4
LA6585FA
Internal Equivalent Circuits
VCC
IN+
OUT1
H
OUT2
IN-
GND
*FG
Control
circuit
Charge/discharge
Discharge pulse
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PS No.A2088-4/4
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