ENA2024 D

Ordering number : ENA2024
LB1862MC
Monolithic Digital IC
For Fan Motor
http://onsemi.com
Single-Phase Full-Wave Driver
Overview
Single-phase full-wave drive design and a compact package make these ICs optimal for small fans (especially CPU
cooling fans). Low switching noise and effective motor drive are further advantages.
Functions
• Support for 5V/12V dual power supply voltage
• Built-in regenerative circuit allows use of reverse connection protection diode
• Built-in Hall amplifier with hysteresis (supports core without auxiliary electrode)
• Built-in lockup protection and automatic recovery circuits
• Latch-type lockup detection output (RD) is Low during rotation and High during stop
• Hall bias pin and start/stop pin allow reduced current drain in standby mode
• Built-in thermal protection circuit
Specifications
Absolute Maximum Ratings at Ta = 25°C
Parameter
Symbol
Conditions
Ratings
Unit
Maximum supply voltage
VCC max
17
Maximum output current
IOUT max
0.5
V
A
Maximum output withstand voltage
VOUT max
17
V
RD maximum output withstand voltage
VRD max
17
V
RD maximum output current
IRD max
5
mA
mA
HB maximum output current
IB max
10
ST maximum input voltage
VST max
15
V
Allowable power dissipation
Pd max
850
mW
Operating temperature
Topr
-30 to +90
°C
Storage temperature
Tstg
-55 to +150
°C
Mounted on a specified board *
* Specified board: 114.3mm × 76.2mm × 1.5mm, glass epoxy board.
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
31412 SY 20120127-S00004 No.A2024-1/7
LB1862MC
Allowable Operating Conditions at Ta = 25°C
Parameter
Symbol
Conditions
Ratings
Unit
Power supply voltage
VCC
3.8 to 16.8
V
ST input High level voltage
STH
3 to 14
V
ST input Low level voltage
STL
-0.3 to +0.4
V
Hall input common mode voltage
VICM
0.2 to VCC-1.5
V
Electrical Characteristics at Ta = 25°C, VCC = 5V
Parameter
Symbol
Ratings
Conditions
min
Current drain
ICC
Lockup detection
typ
Unit
max
In drive mode (CT = “L”, ST = “L”)
6.5
9.1
mA
In lockup protection mode (CT = “H”, ST = “L”)
2.2
3.1
mA
In standby mode (ST = “H”)
110
150
μA
1.9
2.8
3.7
μA
0.32
0.46
0.60
μA
5.0
6.0
7.0
ICT1
capacitor charge current
Capacitor discharge current
ICT2
Capacitor charge/discharge
RCT
RCT = ICT1/ICT2
current ratio
CT charge voltage
VCT1
2.55
2.75
2.95
V
CT discharge voltage
VCT2
1.6
1.8
2.0
V
Output Low level voltage
VOL
IO = 200mA
0.2
0.3
V
Output High level voltage
VOH
IO = 200mA
Hall input sensitivity
VHN
Zero peak value (Including offset and hysteresis)
7
15
mV
RD output pin Low voltage
VRD
IRD = 5mA
0.1
0.3
V
RD output pin leakage current
IRDL
VRD = 15V
30
μA
HB output Low voltage
VHBL
IHB = 5mA
1.0
1.3
V
ST pin input current
IST
VST = 5V
75
100
μA
3.9
4.1
V
Package Dimensions
unit : mm (typ)
3420
2
1.0
0.15
0.35
0.05 (1.5)
1.55
1
SANYO : MFP10SK(225mil)
Allowable power dissipation, Pd max -- mW
0.5
4.4
6.2
10
0.8 MAX
Pd max -- Ta
1
5.0
Specified board: 114.3×76.2×1.5mm3
glass epoxy board.
0.85
0.8
0.6
0.41
0.4
0.2
0
-30 -20
0
20
40
60
Ambient temperature, Ta -- °C
80
90 100
No.A2024-2/7
LB1862MC
Pin Assignment
1
10 RD
IN+ 2
9 HB
CT 3
LB1862MC
8 ST
OUT1 4
7 VCC
GND 5
6 OUT2
Top view
Block Diagram
CT
Charge / Discharge
circuit
RD
Discharge
pulse
VCC
HALL
IN+
Delay circuit
OUT2
Hysteresis amplifier
Control
circuit
M
HB
Delay circuit
OUT1
Thermal protection
circuit
START/STOP
ST
GND
Truth Table
ST
IN-
IN+
CT
OUT1
OUT2
RD
HB
Mode
H
-
-
-
OFF
OFF
OFF
OFF
Standby
L
L
Rotating
OFF
L
Lockup protection activated
L
H
L
L
H
-
-
L
H
H
L
L
H
OFF
OFF
Latch-type RD output is Low during rotation and High during stop.
No.A2024-3/7
LB1862MC
Startup
Power-ON
VCC
OUT
CT
RD
FG
Lockup protection/automatic recovery
Output ON
Locked
Released
OUT
Output OFF
Output OFF
RD
FG
CT
Start/stop
ST
OUT
Output OFF
RD
FG
No.A2024-4/7
LB1862MC
Design Reference
(1) VCC pin
Power supply pin for control block and motor drive.
Accepts a wide operation voltage range from 3.8 to 16.8V, for 5V/12V dual power supply support.
(2) OUT1, OUT2 pins
Single-phase coil output pins.
Bipolar drive output with upper side inverted and lower side single output. Built-in regenerative circuit regenerates
kickback current between lower side NPN outputs when a diode is used for protection against reverse connection.
(3) IN−, IN+ pins
Hall input signal pins
The Hall signal is amplified into a square wave by the Hall amplifier with hysteresis characteristics of ±3.5mV (typ.).
The Hall input signal amplitude should be 70mV or more.
(4) CT pin
This pin serves for connecting a capacitor between CT and GND.
The capacitor determines the characteristics of the built-in lockup protection circuit for preventing coil burnout in the
case of motor restraint. Once normal motor load is restored, the automatic recovery circuit resets itself.
Changing the capacitance alters the lockup detection time.
When a 0.47 mF capacitor is connected between CT and GND
Lockup detection time
: approx. 0.5s
Lockup protection time/automatic recovery time
: approx. 0.16s (output ON)
approx. 1s (output OFF)
When not using lockup protection function, this pin should be connected to ground.
(5) RD pin
Open-collector output pin that is Low during rotation and OFF when lockup is detected.
The output is a latch type which stays OFF also when the automatic recovery circuit has restored drive mode unless
the rotation actually resumes.
(6) ST pin and HB pin
ST pin : When input to this pin is High, motor drive is stopped (OUT is high impedance).
At this time, RD output indicates lockup protection mode OFF.
HB pin : Hall bias switching pin. At ST pin High input, Hall bias is switched to reduce current drain in fan standby
mode.
If not used, both pins should be open.
(7) Thermal protection circuit
When internal temperature Tj of IC reaches 180°C, output current limiter is activated to protect against damage.
No.A2024-5/7
LB1862MC
Application Circuit Example
7
C2
VCC
H
1
RD
10
(FG)
+
2 IN
OUT1 4
9 HB
LB1862MC
OUT2 6
8 ST
3 CT
GND
5
ICC -- VCC
12
VCC = 5V
10
400
IN− = L
8
Input current, IIN -- μA
Current drain, ICC -- mA
IIN -- VIN
500
IN+ = L
6
4
CT = H
300
200
100
2
ST = H
0
0
2
4
6
8
10
12
14
16
18
20
0
0
22
2
4
VO(sat)L -- IO
VCC = 3.8V
Ta = 25°C
0.4
0.3
0.2
0.1
0
0
100
200
Output current, IO -- A
300
400
Upper side output saturation voltage, VO(sat)H -- V
Lower side output saturation voltage, VO(sat)L -- V
0.5
6
8
10
12
14
16
18
20
Input voltage, VIN -- V
Power supply voltage, VCC -- V
VO(sat)H -- IO
1.0
VCC = 3.8V
Ta = 25°C
0.8
0.6
0.4
0.2
0
0
100
200
300
400
500
Output current, IO -- A
No.A2024-6/7
LB1862MC
VRD,VHB -- IRD,IHB
1.0
VCC = 3.8V
Ta = 25°C
HB
VRD, VHB -- V
0.8
0.6
0.4
0.2
RD
0
0
2
4
6
8
10
12
14
IRD, IHB -- mA
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PS No.A2024-7/7
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