EN6203 D

Ordering number : EN6203A
LB1868M
Monolithic Digital IC
2-phase Brushless
http://onsemi.com
Fan Motor Driver
Overview
The LB1868M is a 2-phase unipolar brushless motor driver. With only a few peripheral parts, lockup protection and
automatic recovery can be implemented. The IC can be configured for 12V or 24V operation and a wide range of
variations, from Low speed to H-High speed and from 60cm to 120cm square using the same PCB. This makes it easy
to design highly reliable fan motor installations.
Features
• Output protection Zener diode with variable withstand voltage
Z1, Z2 pins open: VOLM = 57V (24V specification)
Z1, Z2 pins shorted: VOLM = 32V (12V specification)
External Zener diode connected across Z1 − VCC pins: support for fans with large drive current
• External resistor allows configuration for 12V or 24V
• Direct Hall element connection possible (built-in Hall amplifier with hysteresis supports core without auxiliary electrode)
• Built-in output transistor with 1.0A output current (strengthened negative-current support for core without auxiliary
electrode)
• Built-in rotation detection function: Low during rotation and High during stop
• Built-in lockup protection with automatic recovery
• ST pin for motor stop/drive (for standby mode of copiers etc.)
• FG output pin for rotation detection
• BC pin for kickback noise reduction (with 2 external capacitors)
• Built-in thermal shutdown
Specifications
Absolute Maximum Ratings at Ta = 25°C
Parameter
Maximum input current
Symbol
ICC max
Conditions
t ≤ 20ms
Ratings
Unit
200
Internal
mA
Maximum applied output voltage
VOUT max
Maximum output current
IOUT max
1.0
V
A
Current flowing into RD, FG
IRD max
10
mA
V
RD, FG applied voltage
VRD max
30
ST applied voltage
VST max
7.5
V
Allowable power dissipation
Pd max
800
mW
Operating temperature
Topr
-30 to +80
°C
Storage temperature
Tstg
-55 to +150
°C
Mounted on a specified board *
* Specified board: 20mm × 15mm × 1.5mm, glass epoxy board.
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
31109 MS / 83100RM(KI) No.6203-1/5
LB1868M
Allowable Operating Ranges at Ta = 25°C
Parameter
Symbol
Conditions
Ratings
Unit
Input current range
ICC
6.0 to 50
Common mode input voltage range
VICM
0.2 to VIN-1.5
mA
V
ST High voltage
VSTH
4.5 to 7.0
V
ST Low voltage
VSTL
0 to 0.5
V
Electrical Characteristics at Ta = 25°C, ICC = 10mA
Parameter
Symbol
Ratings
Conditions
min
Output limiter withstand voltage
Output saturation voltage
typ
Unit
max
VOLM1
Z1, Z2 open
54
57
60
V
VOLM2
Z1, Z2 short
31
33
35
V
VOsat1
IO = 0.5A
0.95
1.2
V
VOsat2
IO = 1.0A
VIN voltage
VIN
ICC = 7.0mA
Hall input sensitivity (at zero peak)
VHN
Including offset and hysteresis
6.4
1.15
1.5
V
6.7
7.0
V
20
mV
RD, FG output saturation voltage
VRDsat
IRD = 5mA
0.1
0.3
V
CT drain current
IC1
C = GND
2.7
3.8
4.9
μA
CT discharge current
IC2
C = VIN
0.19
0.30
0.41
μA
Comp input threshold voltage
VTH1
0.77
0.8VIN
0.83
V
VTH2
0.42
0.45VIN
0.48
V
80
120
μA
ST input current
IST
VST = 5V
Thermal protection operating
TSD
Design target value *
180
°C
ΔTSD
Design target value *
40
°C
temperature
Thermal protection circuit
hysteresis
* Design target value, Do not measurement.
Package Dimensions
unit : mm (typ)
3111A
Pd max -- Ta
8.0
14
0.63
4.4
6.4
8
1
1.7MAX
7
1.0
0.35
0.15
0.1 (1.5)
(1.0)
SANYO : MFP14S(225mil)
Allowable power dissipation, Pd max -- W
1.0
Specified board: 20×15×1.5mm3
glass epoxy board.
0.8
0.6
0.4
0.2
0
-30 -20
0
20
40
60
80
100
Ambient temperature, Ta -- °C
No.6203-2/5
LB1868M
Pin Assignment
14 VIN
IN+ 2
13 RD
CT 3
12 FG
LB1868M
IN− 1
ST 4
BC 5
11 Z2
10 Z1
OUT1 6
9 OUT2
8 NC
GND 7
Top view
Pin Function
Pin No.
Pin name
Function
1
IN−
Hall input + pin. Hysteresis amplifier
2
IN+
Hall input − pin. Hysteresis amplifier
3
CT
Lockup protection time setting capacitor pin (0.47 to 4.7μF).
4
ST
Start/stop pin.
5
BC
Output transistor common base pin.
6
OUT1
Output 1 pin.
9
OUT2
Output 2 pin.
7
GND
GND pin.
10
Z1
External Zener diode pin (external Zener diode to be connected between power supply and Z1).
11
Z2
Kickback absorption voltage alteration pin (shorted to Z1: 12V operation).
12
FG
Rotation frequency detector pin.
13
RD
Lockup detection pin (latch type).
14
VIN
Regulated power supply input pin (limiting resistor to be inserted between power supply and VIN).
Truth Table
ST
H
L
or
OPEN
IN+
IN−
CT
OUT1
OUT2
RD
FG
H
L
L
H
H
L
L
L
H
L
H
H
L
H
H
L
L
H
L
L
L
L
H
L
L
H
L
H
H
L
H
H
H
H
L
L
H
H
H
H
H
H
* RD is a latch type output
No.6203-3/5
LB1868M
Block Diagram
VIN
VCC
L1
Thermal
shutdown
R1
L2
OUT1
R2
IN+
H
IN−
Control block
BC
Z1
ST
Constant
current
source
Z2
OUT2
CT
FG
C1
RD
0.47 to 10μF
GND
Application Circuit Example
(1) 12V supply voltage
VCC
12V
330Ω
14
VIN
2kΩ
13
RD
12
FG
11
Z2
10
Z1
9
OUT2
8
NC
OUT1
6
GND
7
LB1868M
IN−
1
H
IN+
2
CT
3
ST
4
BC
5
0.47μF
No.6203-4/5
LB1868M
(2) 24V supply voltage
VCC
24V
1.2kΩ
14
VIN
2kΩ
13
RD
11
Z2
12
FG
10
Z1
9
OUT2
8
NC
BC
5
OUT1
6
GND
7
10
Z1
9
OUT2
8
NC
OUT1
6
GND
7
LB1868M
IN−
1
IN+
2
H
CT
3
ST
4
0.47μF
(3) High-Power Fan (120mm-HH-Speed)
VCC
12V
(24V)
330Ω
(1.2kΩ)
14
VIN
2kΩ
VZ=12V
(24V)
13
RD
12
FG
11
Z2
LB1868M
IN−
1
H
IN+
2
CT
3
ST
4
BC
5
0.47μF
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PS No.6203-5/5
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