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A8181 PDF даташит

Спецификация A8181 изготовлена ​​​​«AiT Semiconductor» и имеет функцию, называемую «HIGH BRIGHTNESS LED DRIVER».

Детали детали

Номер произв A8181
Описание HIGH BRIGHTNESS LED DRIVER
Производители AiT Semiconductor
логотип AiT Semiconductor логотип 

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A8181 Даташит, Описание, Даташиты
AiT Semiconductor Inc.
www.ait-ic.com
 
A8181
36V, 1.2A LED STEP-DOWN
HIGH BRIGHTNESS LED DRIVER WITH INTERNAL SWITCH
 
DESCRIPTION
The A8181 is a continuous mode inductive step-down
converter, designed for driving single or multiple
series connected LEDs efficiently from a voltage
source higher than the LED voltage. The device
operates from an input supply between 6V and 36V
and provides an externally output current up to 1.2A.
Depending upon supply voltage and external
components, this can provides up to 24 watts of
output power.
The A8181 includes the output switch and a high-side
output current sensing circuit, which uses an external
resistor to set the nominal average output current.
FEATURES
Simple low parts count
Internal 36V NDMOS switch
Up to 1.2A output current
Single pin on/off and brightness control using
DC voltage or PWM
Soft Start
High efficiency (up to 97%)
Wide input voltage range: 6V to 36V
Output shutdown
Up to 1MHz switching frequency
Inherent open-circuit LED protection
Typical 3% output current accuracy
High-side current sense
Hysteretic control: no compensation
Adjustable constant LED current
Over temperature protection
Available in SOT-25 package
Output current can be adjusted by applying an
external control signal to the 'ADJ' pin. The ADJ pin
will accept either a DC voltage or a PWM waveform.
During DC dimming, this will provide a continuous
output current that is proportional to the external
applied DC voltage. During the PWM dimming, this
will provide a gated output current and the average
current is proportional to the duty cycle. Applying a
voltage of 0.2V or lower to the ADJ pin turns the
output off and switches the device into a low current
standby state.
APPLICATIONS
Low voltage halogen replacement LEDs
Automotive lighting
Low voltage industrial lighting
LED back-up lighting
Illuminated signs
LCD TV backlighting
TYPICAL APPLICATION
The A8181 is available in SOT-25 Packages.
ORDERING INFORMATION
Package Type
Part Number
SOT-25
Note
E5
A8181E5R
A8181E5VR
V: Green Package
R : Tape & Reel
AiT provides all Pb free products
Suffix “ V “ means Green Package
REV1.0
- APR 2011 RELEASED -
-1-









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A8181 Даташит, Описание, Даташиты
AiT Semiconductor Inc.
www.ait-ic.com
 
 
PIN DESCRIPTION
A8181
36V, 1.2A LED STEP-DOWN
HIGH BRIGHTNESS LED DRIVER WITH INTERNAL SWITCH
Pin #
1
2
3
4
5
TOP VIEW
Symbol
Function
LX
GND
ADJ
ISENSE
VIN
Drain of NDMOS switch
Ground(0V)
Multi-function On/Off and brightness control pin:
Leave floating for normal operation.
Drive to voltage below 0.2V to turn off output current
Drive with DC voltage (0.3V < VADJ < 1.2V) to adjust output current from
25% to 100% of IOUTnom. If the ADJ voltage is larger than 1.2V, the
output current is IOUTnom.
Drive with PWM signal from open-collector or open-drain transistor, to
adjust output current.
Connect a capacitor from this pin to ground to activate soft-start.
(soft-start time is approx.0.06ms/nF)
Connect resistor RS from this pin to VIN to define nominal average output
current IOUTnom = 0.1/RS
Input voltage (6V to 36V). Decouple to ground with 4.7uF or higher X7R
ceramic capacitor close to device
REV1.0
- APR 2011 RELEASED -
-2-









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A8181 Даташит, Описание, Даташиты
AiT Semiconductor Inc.
www.ait-ic.com
 
 
ABSOLUTE MAXIMUM RATINGS
A8181
36V, 1.2A LED STEP-DOWN
HIGH BRIGHTNESS LED DRIVER WITH INTERNAL SWITCH
VIN, Input Supply Voltage
-0.3V to +40V
VISENSE, ISENSE Voltage
+0.3V to -5V NOTE1
VLX, LX Output Voltage
-0.3V to +40V
VADJ, Adjust Pin Input Voltage
-0.3V to +6V
ILX, Switch Output Current
1.5A
Maximum Junction Temperature
150°C
Operating Temperature Range NOTE2
-40°C to 125°C
Storage Temperature Range
-55°C to 150°C
Lead Temperature (Soldering, 10s)
300°C
Stresses above may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at
these or any other conditions beyond those indicated in the Electrical Characteristics is not implied. Exposure to absolute maximum
rating conditions for extended periods may affect device reliability.
NOTE1: VISENSE measured respect to VIN.
NOTE2: The A8181 is guaranteed to meet performance specifications from 0°C to 70°C. Specifications over the -40°C to 125°C
operating temperature range are assured by design, characterization and correlation with statistical process controls.
THERMAL RESISTANCE NOTE3
Package
θJA
SOT-25
250°C/W
NOTE3: Thermal Resistance is specified with approximately 1 square of 1 oz copper.
θJC
130°C/W
REV1.0
- APR 2011 RELEASED -
-3-










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