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A8181 데이터시트 PDF




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부품번호 A8181 기능
기능 HIGH BRIGHTNESS LED DRIVER
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A8181 데이터시트, 핀배열, 회로
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-




A8181 pdf, 반도체, 판매, 대치품
AiT Semiconductor Inc.
www.ait-ic.com
 
 
ELECTRICAL CHARACTERISTICS
A8181
36V, 1.2A LED STEP-DOWN
HIGH BRIGHTNESS LED DRIVER WITH INTERNAL SWITCH
Test conditions: VIN =12V, TA = 25°C, unless otherwise noted.
Parameter
Symbol
Conditions
Input voltage
VIN
Under voltage lock out
VUVLO
VIN Rising
UVLO hysteresis
VUVLO(HYS) VIN falling
Quiescent supply current with
output off
IQ(OFF)
ADJ Pin grounded
Quiescent supply current with
output switching
IQ(ON)
ADJ Pin floating
f=250KHz
Mean current sense threshold
voltage
VISENSE
Measure on ISENSE pin
with respect to VIN
Sense threshold hysteresis
VSENSE(HYS)
ISENSE pin input current
ISENSE
VISENSE = VIN-0.1
ADJ pin floating voltage
VADJ
ADJ pin floating
ADJ pin leakage current
IADJ ADJ pin grounded
ADJ pin pull up resistor to internal
supply voltage
RADJ
DC voltage on ADJ pin to switch
device from active (on) state to
VADJ(OFF) VADJ falling
quiescent (off) state
DC voltage on ADJ pin to switch
device from quiescent (off) state
VADJ(ON)
VADJ rising
to active (on) state
Digital dimming ADJ pin input
voltage high
VADJ(H)
Digital dimming ADJ pin input
voltage low
VADJ(L)
DC brightness control
VADJ(DC)
Recommended Digital dimming
frequency
fADJ
Duty cycle range of PWM signal
applied to ADJ pin during low
DPWM(LF)
fADJ =100Hz
frequency PWM dimming mode
Min Typ. Max Units
6 - 36 V
- 5.07 -
V
- 4.87 -
V
- 50 100 μA
- 1.8 50 mA
97 100 103 mV
- ±15 - %
- 1.2 10 μA
- 5 -V
- 5 - μA
- 1 - mΩ
0.15 0.2 0.25 V
0.2 0.25 0.3 V
1.5 -
-V
- - 0.2 V
0.3 - 1.2 V
0.1 - 20 kHz
0.1 - 100 %
REV1.0
- APR 2011 RELEASED -
-4-

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A8181 전자부품, 판매, 대치품
AiT Semiconductor Inc.
www.ait-ic.com
 
A8181
36V, 1.2A LED STEP-DOWN
HIGH BRIGHTNESS LED DRIVER WITH INTERNAL SWITCH
 
TYPICAL PERFORMANCE CHARACTERISTICS
Test conditions: VIN =12V, RS=0.1W, TA = 25°C, unless otherwise noted.
1. Efficiency vs. Supply Voltage, L=33uH
2. Output Current Variation vs. Supply Voltage, L=33uH
3. Operating Frequency vs. Input Voltage, L=33uH 4. Duty Cycle vs. Input Voltage, L=33uH
5. Output Current vs. Supply Voltage, L=33uH
6. Output Current Variation vs. Supply Voltage, L=47uH
REV1.0
- APR 2011 RELEASED -
-7-

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