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PDF A1569K Data sheet ( Hoja de datos )
| Número de pieza | A1569K | |
| Descripción | Automotive LED Driver | |
| Fabricantes | Allegro | |
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A1569K
Automotive LED Driver with
Integrated Hall-Effect Switch
FEATURES AND BENEFITS
• Linear LED drive current ≤150 mA set by an external
reference resistor
• High sensitivity, omnipolar Hall-effect switch for LED
on/off control
• Low component count for small size and ease of design
• Elegant fade-in/fade-out effects with adjustable duration
(optional)
• Qualified per AEC-Q100 for automotive applications
• Low dropout voltage and low supply current
• Chopper-stabilized Hall switch
□□Low switchpoint drift over temperature
□□Insensitivity to physical stress
• Input pin for external LED driver control
• Slew-rate-limited LED output drive for current transient
suppression
• Ruggedness and reliability
□□Integrated voltage regulator for operation from 7 to 24 V
□□Reverse-battery protection
□□Automatic short-circuit and thermal overload
protection and recovery
□□–40ºC to 125ºC ambient temperature range
• Small 8-pin SOIC package with thermal pad
PACKAGE:
8-Pin SOICN with Exposed Thermal Pad (Suffix LJ)
Not to scale
DESCRIPTION
The A1569K is a highly integrated solution that combines a
Hall-effect switch with a linear, programmable current regulator,
providing up to 150 mA to drive one or more LEDs. With the
addition of only two passive components and one or more
LEDs, the A1569K forms a complete, magnetically actuated
lighting solution that is small, flexible, elegant, easy to design,
rugged, and reliable. It is optimized for automotive interior and
auxilliary lighting such as map lights, glove boxes, consoles,
vanity mirrors, hood/truck/bed lights, etc.
The LED drive current is set by an external resistor; the LED is
then activated by the built-in Hall-effect switch and features an
adjustable fade-in/fade-out effect. Omnipolar operation (either
north or south pole) and high magnetic sensitivity make the
A1569K tolerant of large air gaps and mechanical misalignment.
System assembly is easier, as the magnet can be oriented with
either pole facing the device. Chopper stabilization provides
low switchpoint drift over the operating temperature range.
The driver can also be activated via an external input for direct
control of the LED.
In addition to contactless operation and safe, constant-current
LED drive, reliability is further enhanced with reverse-battery
protection, thermal foldback, and automatic shutdown for
thermal overload and shorts to ground.TheA1569K will prevent
damage to the system by removing LED drive current until
the short is removed and/or the chip temperature has reduced
below the thermal threshold. The driver output is slew-rate-
limited to reduce electrical noise during operation.
Continued on the next page…
For standalone operation,
SEN_EN is pulled high
(e.g., tied to VIN)
+V
CBYPASS
Optional
Control Signals
From MCU or
Remote Switch
SLEEP
LED_ON
VIN
SEN_EN
EXT HALL
LA
RIREF
IREF
No Connect
or THTH
Connect to GND
FADE
GND
150 mA
CFADE
(optional)
A1569K-DS
Typical Application Diagram
1 page  
A1569K
Automotive LED Driver with
Integrated Hall-Effect Switch
ELECTRICAL CHARACTERISTICS (continued): Valid at TA = –40°C to 125°C, VIN = 7 to 24 V (unless otherwise
specif ied)
Characteristic
Symbol
Test Conditions
Min.
Typ.1
Max. Units
Protection
Short Detect Voltage
VSCD
Measured at LA
1.2 – 1.8 V
Short-Circuit Source Current
ISCS Short present LA to GND
– 1 – mA
Short Release Voltage Hysteresis
VSChys
VSCR – VSCD, measured with 0.1 µF cap between
ILA and GN
200
–
500 mV
Thermal Monitor Activation2
Thermal Monitor Slope2
Thermal Monitor Low Current
Temperature
TJM
dISEN/dTJ
TJL
TJ with ISEN = 90%, THTH open
ISEN = 50%, THTH open
TJ at ISEN = 25%, THTH open
110 130 145 ºC
–3.5 –2.5 –1.5 %/ºC
135 150 165 ºC
Overtemperature Shutdown
Overtemperature Hysteresis
Magnetic Characteristics3
TJF
TJhys
Temperature increasing
Recovery occurs at TJF – TJhys
– 170 – ºC
– 15 – ºC
Operate Point
Release Point
Hysteresis
BOPS
BOPN
BRPS
BRPN
BHYS
SEN_EN = high and BFIELD > BOP, LED is off
(EXT = low)
SEN_EN = high and BFIELD < BRP, LED is on
(EXT = low)
| BOPX – BRPX |
– 40
–70 –40
5 25
– –25
5 15
70 G
–G
–G
–5 G
25 G
LED On
LED Off
Decreasing
BFIELD
Magnitude
BHYS
Increasing
BFIELD
Magnitude
Figure 1: Hall Switch Control of LED State
1 Typical data is at TA = 25ºC and VIN = 12 V; for design information only.
2 Guaranteed by design.
3 Magnetic flux density, B, is indicated as a negative value for north-polarity magnetic fields, and is a positive value for south-polarity magnetic fields.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
5
5 Page 
A1569K
Automotive LED Driver with
Integrated Hall-Effect Switch
Function Truth Table
EXT
0
0
0
1
SEN_EN
0
1
1
X
Magnetic Field B
X
B > BOP
B < BRP
X
LED
OFF
OFF
ON
ON
Example Function Diagrams
BFIELD
B > BOP
B < BRP
SEN_EN
High
Low
EXT
High
Low
ILED
Max
0 mA
Fade in
Fade out
Figure 3: Hall-Activated Operation
With EXT low and SEN_EN high, the switching of the LED is controlled by the BFIELD as detected by the Hall sensor.
BFIELD
B > BOP
B < BRP
SEN_EN
High
Low
EXT
High
Low
ILED
Max
0 mA
Figure 4: Disabling the Hall Sensor with SEN_EN
The Hall sensor can be disabled by driving SEN_EN low. This will force the LED off even if the BFIELD is below BOP.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
11
11 Page | ||
| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet A1569K.PDF ] | |
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