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PDF LB1862 Data sheet ( Hoja de datos )
| Número de pieza | LB1862 | |
| Descripción | Single-Phase Full-Wave Driver | |
| Fabricantes | ON Semiconductor | |
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Ordering number : EN6208B
LB1862
Monolithic Digital IC
For Fan Motor
Single-Phase Full-Wave Driver
http://onsemi.com
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
Maximum supply voltage
Maximum output current
Maximum output withstand voltage
RD maximum output withstand voltage
RD maximum output current
HB maximum output current
ST maximum 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
Ratings
17
0.8
17
17
5
10
15
1.0
-30 to +85
-55 to +150
Unit
V
A
V
V
mA
mA
V
W
°C
°C
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
22509 MS / O2599RM(KI) No.6208-1/6
1 page  
Design Reference
LB1862
(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.6208-5/6
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet LB1862.PDF ] | |
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