|
|
PDF MLX90285 Data sheet ( Hoja de datos )
| Número de pieza | MLX90285 | |
| Descripción | 24V Low Noise Two-Coil Fan Driver | |
| Fabricantes | Melexis | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de MLX90285 (archivo pdf) en la parte inferior de esta página. Total 13 Páginas | ||
|
No Preview Available !
MLX90285
24V Low Noise Two-Coil Fan Driver
Features and Benefits
1-chip solution (Hall element + Output Drivers)
Soft Switching for low noise
Active Slope Control without external components
automatically adapts slope to rotation speed
Two-Stage Thermal Protection
Locked Rotor Protection and auto-restart
Tachometer open drain output (MLX90285-FG)
Alarm open drain output (MLX90285-RD)
Available in 4-pin through-hole VK (“No-VDD” design)
and surface mount SOIC8, all “Green” Compliant package
Pin-to-pin compatible with US90A & US91A
Application Examples
24V Two-Coil Design Cooling Fans
Office Automated Equipment (Printers)
Brown-Goods (DVD player)
Home Appliances (Rice cooker)
Automotive Climate Control Fan
Car Audio Cooling Fan
Ordering Code
Product Code Temperature Code
MLX90285
L
MLX90285
L
MLX90285
L
MLX90285
L
Package Code
VK
VK
DC
DC
Option Code
ABA-000
AAA-000
ABA-000
AAA-000
Packing Form Code
BU
BU
RE
RE
Legend:
Temperature Code:
Package Code:
Option Code:
Packing Form:
L for Temperature Range -40°C to 150°C
VK for Plastic Single in Line
DC for SOIC150
AAA-000 for Frequency Generation, ABA-000 for Rotation Detection
BU for Bulk, RE for Reel (live bug)
Ordering example:
MLX90285LVK-ABA-000-BU
1 Functional Diagram
2 General Description
OUT1
Power Output Driver
HV Clamp
Slope
Control
Level
Shifter
No-VDD system
Voltage Regulator
Crossover
Detection
Hall plate
BOP/BRP
Offset
Cancellation
COMP
Power-On Reset
Oscillator
Digital Core
Locked Rotor
Protection
Output Control
Digital Slope
Control
Register
Two-Stage
Thermal Protection
Test Control
Clock
Generator
GND
OUT2
Power Output Driver
HV Clamp
Slope
Control
Level
Shifter
DAC
Reference Bias
Supply Voltage
Track & Hold
Logic Driver
FG/RD
The MLX90285 is a one-chip solution for driving two-coil
brushless DC cooling fans.
The device features Soft Switching to lower acoustic and
electrical fan noise. This efficient solution is enhanced with an
intelligent Active Slope Control which automatically adjusts
the slope duration depending on the fan rotation speed. Thus,
the fan performance to noise ratio is always kept optimum
without the need of tuning via external component.
The device includes a novel Two-Stage Thermal Protection as
well as Locked Rotor Protection for demanding application
safety requirements.
Frequency Generator or Rotation Detection is available. The
open-drain output makes the connectivity with any external
interface for hardware monitoring easier.
These features are combined with the Melexis patented no-
VDD design to fit the IC in small 4-pin VK package.
The device is also delivered in DC package for automatic
assembly.
3901090285
Rev. 004
Page 1 of 14
DataSheet
Apr/13
Free Datasheet http://www.Datasheet4U.com
1 page  
MLX90285
24V Low Noise Two-Coil Fan Driver
7 Magnetic Specifications
DC Operating Parameters TJ = 25°C, VDD = 5 to 30V (unless otherwise specified)
Parameter
Symbol
Min Typ Max
Units
Operate point
BOP
0.5 3
6
mT
Release point
BRP
-6 -3 -0.5
mT
Hysteresis
BHYST
26
mT
Table 3: Magnetic specifications
8 Driver Output vs Magnetic Pole
Parameter
Test Conditions
North pole
B < Brp – all packages
South pole
B > Bop - all packages
Table 4: Driver output vs. magnetic pole (7)
OUT1
High
Low
OUT2
Low
High
FG (6)
High
Low
9 Detailed General Description
The MLX90285 is a one-chip solution for driving two-coil brushless DC cooling fans.
Based on mixed-signal CMOS design, the device includes Hall-effect sensor with offset cancellation scheme, voltage
regulator, digital logic and power output drivers in a single package.
The MLX90285-FG version has an open-drain tachometer FG output that follows the Hall signal. This signal is used by
hardware monitoring system to determine the rotation speed of the fan.
In the MLX90285-RD version, the open-drain alarm output RD is a safety signal which allows detecting if the fan rotates or
not. It is active low during normal spinning of the motor. It goes high when the magnetic flux switching frequency drops
below nearly 1.15Hz (35RPM for 2 pole-pair fan)
The built-in locked rotor protection automatically shuts off the coil current when the rotor is mechanically blocked for more
than 0.43 second. The fan tries to restart every 3 seconds until the rotor is released. This on/off cycling reduces the average
current by factor of about 7. This protection prevents the fan to be overheated or damaged.
The device is based on the Melexis patented “no-VDD” design which removes the need of separate supply voltage pin for
two-coil fan. During operation, the power outputs are always operating as complementary, meaning also that one power
output is kept inactive while the other is active. Melexis cleverly turned this fact into benefit as “No-VDD” devices such as
MLX90285 recover the power supply through the inactive power output pin. Therefore, a separate supply voltage pin is not
required anymore and the device including logical output FG/RD can fit into a small 4-pin through-hole package VK.
In the application, the “No-VDD” design inherently isolates the IC behind the fan coils. Without direct output to the external
environment, the device is best protected against ESD and over-voltage issue on the power supply voltage line.
6 FG state is only valid during normal operation. In locked rotor protection, FG signal is high
7 The magnetic pole is applied facing the branded side of the package
3901090285
Rev. 004
Page 5 of 14
DataSheet
Apr/13
Free Datasheet http://www.Datasheet4U.com
5 Page 
MLX90285
24V Low Noise Two-Coil Fan Driver
14 Packages Information (Outline Drawing, Hall Plate location & Pinout)
14.1 VK Package (4-pin TO92)
5.22+/-0.10
4.20+/-0.10
1.55+/-0.10
0.73+/-0.10
3°+2 (2X)
0.00
0.20
0.46
+0.02
- 0.03
5°+-21 (2X)
Notes:
1. All dimensions are in millimeters
2. Package dimension exclude molding flash.
Mold flash shall not exceed 0.127mm.
3. To preserve reliability, it is recommended to
have total lead length equal to 2.5mm minimum,
measured from the package line.
4. VK package is a pin through-hole package,
hence adapted for wave soldering process.
A reflow soldering process is not recommended
with VK package as it may seriously affect
device reliability.
1.27+/-0.03
5°+-21
(2X)
3.81+/-0.03
0.38+/-0.03
0.30+/-0.10
(2X)
0.38+/-0.03
Marking:
Top side :
1st Line = 285FG (or 285RD) – Part number
(MLX90285) and Option Code
2nd Line - xxyww – xx = Lot number
y = year (last digit)
ww = calendar week
3°+2
(2X)
2.25+/-0.13
1.05+/-0.13
Hall plate location
0.52
Notes:
1. All dimensions are in millimeters
3901090285
Rev. 004
Pin number (VK)
1
2
3
4
Pin Name
FG (RD)
OUT1
OUT2
GND
Function
FG (RD) open drain output signal
Open Drain Coil Driver 1
Open Drain Coil Driver 2
Ground pin
Page 11 of 14
DataSheet
Apr/13
Free Datasheet http://www.Datasheet4U.com
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet MLX90285.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| MLX90283 | BLDC Vibration Motor Driver | Melexis |
| MLX90285 | 24V Low Noise Two-Coil Fan Driver | Melexis |
| MLX90288 | SMD Programmable Linear Hall Sensor IC | Melexis |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |