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PDF LB1862M Data sheet ( Hoja de datos )
| Número de pieza | LB1862M | |
| Descripción | Single-Phase Full-Wave Driver for Fan Motors | |
| Fabricantes | Sanyo | |
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Ordering number : EN5657
Monolithic Digital IC
LB1862M
Single-Phase Full-Wave Driver for Fan Motors
Overview
The LB1862M is a single-phase full-wave driver provided
in a miniature package that is optimal for driving
miniature fans such as CPU cooling fans. It provides
motor drive with low switching noise and high efficiency.
Functions
• Supports both 5- and 12-V power supplies.
• Allows the use of reverse connection prevention diodes
by including a regeneration circuit on chip.
• On-chip Hall amplifier with hysteresis characteristics
(Supports commutator-free cores.)
• Lock protection and automatic recovery circuits
• Lock detection pin
(Latch type – Low: drive, High: stopped)
• Supports low current drain in standby mode by
providing a Hall bias pin and a start/stop pin.
• Thermal shutdown circuit
Package Dimensions
unit: mm
3086A-MFP10S
[LB1862M]
Specifications
Absolute Maximum Ratings at Ta = 25°C
Parameter
Supply voltage
Output current
Output voltage
RD output voltage
RD output current
HB output current
ST input voltage
Allowable power dissipation
Operating temperature
Storage temperature
Symbol
VCC max
IOUT max
VOUT max
VR max
IR max
IB max
VST max
Pd max
Topr
Tstg
Conditions
When mounted on the specified board *
Note: * Specified board: 114.3 × 76.2 × 1.5 mm epoxy glass laminate board
SANYO: MFP10S
Ratings
17
0.5
15
15
5
10
15
850
–20 to +75
–55 to +150
Unit
V
A
V
V
mA
mA
V
mW
°C
°C
Allowable Operating Ranges at Ta = 25°C
Parameter
Supply voltage
ST input high-level voltage
ST input low-level voltage
Hall input
common-mode input voltage range
Symbol
VCC
STH
STL
VICM
Conditions
Ratings
3.8 to 16.8
3 to 14
–0.3 to +0.4
0.2 to VCC –1.5
Unit
V
V
V
V
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
73097HA(OT) No. 5657-1/6
1 page  
LB1862M
Design Notes
1. VCC pin
This pin provides power for motor drive and the control circuits.
The LB1862M supports a wide range of operating voltages, from 3.8 to 16.8 V, and thus can be used in applications
that support both 5-V and 12-V systems.
2. OUT1 and OUT2 pins
Single-phase coil outputs.
The output is a high side inverted, low side single bipolar output. Since a regeneration circuit is included on chip, the
kickback current is regenerated across the low side NPN output even if a diode is used to protect the circuit against
being destroyed by reversed polarity connection.
3. IN– and IN+ pins
Hall element inputs.
The Hall signal is amplified to be a square wave by the Hall amplifier, which has hysteresis characteristics.
A hysteresis of ±3.5 mV (typical) is applied. A Hall input signal amplitude of 70 mV or higher is recommended.
4. CT pin
The capacitor connected between this pin and ground forms a protection circuit that prevents coil burnout if the motor
locks.
If the motor load returns to an appropriate level, the automatic recovery circuit will restart motor rotation. The lock
detection time can be set by changing the value of the capacitor.
If a 0.47 µF capacitor is used:
Lock detection time:
About 0.5 second
Lock protection time/automatic recovery time: About 0.16 second (output on)
About 1 second (output off)
This pin should be tied to ground if the lock protection function is not used.
5. RD pin
This is an open collector output that is low while the motor is turning and high impedance when the locked state is
detected.
This is a latch type output that holds the output high-impedance state if motor rotation is not restarted by the
automatic recovery circuit.
6. ST and HB pins
ST pin: Stops motor drive when a high level is input.
When ST is high, the RD pin output will go to the high-impedance state indicating lock protection mode.
HB pin: Switches the Hall bias. When a high level is input to the ST pin, applications should switch the Hall bias to
suppress standby mode current drain.
Both these pins should be left open if unused.
7. Thermal shutdown circuit
This circuit protects the IC by limiting the output current if the IC internal temperature reaches Tj = 180°C.
No. 5657-5/6
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet LB1862M.PDF ] | |
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