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BL9581 반도체 회로 부품 판매점

High Brightness LED Driver



BELLING 로고
BELLING
BL9581 데이터시트, 핀배열, 회로
BL9581
36V, 1.2A Step-down
High Brightness LED Driver with Internal Switch
FEATURES
z Simple low parts count
z Internal 36V NDMOS switch
z Up to 1.2A output current
z Single pin on/off and brightness control
using DC voltage or PWM
z Soft Start
z High efficiency (up to 97%)
z Wide input voltage range: 6V to 36V
z Output shutdown
z Up to 1MHz switching frequency
z Inherent open-circuit LED protection
z Typical 3% output current accuracy
z High-side current sense
z Hysteretic control: no compensation
z Adjustable constant LED current
z Over temperature protection
z Pb-free SOT23-5 packages
APPLICATIONS
z Low voltage halogen replacement LEDs
z Automotive lighting
z Low voltage industrial lighting
z LED back-up lighting
z Illuminated signs
z LCD TV backlighting
DESCRIPTION
The BL9581 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 BL9581 includes the output switch and a
high-side output current sensing circuit, which
uses an external resistor to set the nominal
average output current.
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.
ORDERING INFORMATION
BL9581 X XXX
Package:
RN: SOT23--5
Features:
P: Standard (default, lead free)
C: Customized
TYPICAL APPLICATION
VIN(6V-36V)
Rs
0.1ohm
C1 4.7uF
D1
L1 47uH
GND
VIN
N/C ADJ
ISENSE
BL9581
GND
LX
PPMIC BU
BL9581 Rev 1.3
2/2010
www.belling.com.cn
Belling Proprietary Information. Unauthorized Photocopy and Duplication Prohibited
©2010 Belling All Rights Reserved
1


BL9581 데이터시트, 핀배열, 회로
BL9581
36V, 1.2A Step-down
High Brightness LED Driver with Internal Switch
Absolute Maximum Rating (Note 1)
Input Supply Voltage (VIN)
ISENSE Voltage (VISENSE)
LX Output Voltage (VLX)
Adjust Pin Input Voltage (VADJ)
Switch Output Current (ILX)
-0.3V to +40V
+0.3V to -5V(Note2)
-0.3V to +40V
-0.3V to +6V
1.5A
Maximum Junction Temperature
150°C
Operating Temperature Range(Note3) -40°C to 125°C
Storage Temperature Range
-55°C to 150°C
Lead Temperature (Soldering, 10s)
300°C
Package Information
LX 1
SOT23-5
TOP VIEW
5 VIN
GND 2
Part Number
BL9581
ADJ 3
Top Mark
F A Y W(Note4)
4 ISENSE
Temp Range
-40°C to +125°C
Thermal Resistance (Note 5):
Package
ӨJA
ӨJC
SOT23-5
250°C/W 130°C/W
Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired.
Note 2: VISENSE measured respect to VIN
Note 3: The BL9581 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.
Note 4: F: Product Code A: Default Y: Year of wafer manufacturing W: Week of wafer manufacturing.
Y9 A B C D
Year 2009 2010 2011 2012 2013
W
Week
A
1
…Y Z a…y z
… 26 27 28 … 53 54
Note 5: Thermal Resistance is specified with approximately 1 square of 1 oz copper.
PPMIC BU
BL9581 Rev 1.3
2/2010
www.belling.com.cn
Belling Proprietary Information. Unauthorized Photocopy and Duplication Prohibited
©2010 Belling All Rights Reserved
2




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