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PDF BL9581 Data sheet ( Hoja de datos )

Número de pieza BL9581
Descripción High Brightness LED Driver
Fabricantes BELLING 
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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

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BL9581 pdf
BL9581
36V, 1.2A Step-down
High Brightness LED Driver with Internal Switch
Electrical Characteristics (continued)
(Test conditions: VIN =12V, TA = 25°C, unless otherwise noted.)
Symbol
Parameter
Conditions
MIN TYP MAX Unit
ILX(MEAN)
TEN, DELAY
TENB, DELAY
fLX(MAX)
TOTP
TSD(HYS)
Continuous LX switch current
The delay time between ADJ
Chip enable delay time pin rising edge and LX pin
falling edge
The delay time between ADJ
Chip disable delay time pin falling edge and LX pin
rising edge
Recommended maximum
operating frequency
Over temperature protection
threshold
Temperature rising
Over temperature protection
hysteresis
Temperature falling
1.2
480
A
ns
25 ns
1 MHz
160 °C
20 °C
Note 6: 100% production test at +25°C. Specifications over the temperature range are guaranteed by design and
characterization.
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
5

5 Page





BL9581 arduino
BL9581
36V, 1.2A Step-down
High Brightness LED Driver with Internal Switch
which can be adjusted to a less one by
dimming.
The table below gives values of nominal
average output current for several
preferred values of current setting resistor
(RS) in the typical application circuit shown
on page 1.
Nominal average output current (mA)
1000
RS(Ω)
0.1
760 0.13
667 0.15
333 0.3
with duty cycle PWM can be applied to the
ADJ pin, as shown below, to adjust the
output current to a value below the nominal
average value set by resistor RS:
IOUT = 0.1× D (0 D 100%,1.2V VADJ 5V )
RS
IOUT = VPULSE × 0.1× D (0 D 100%, 0.3V VPULSE 1.2V )
1.2 × RS
RS L1
VIN 1 2
47uH
Output current adjustment by external
DC control
The ADJ pin can be driven by an external
dc voltage (VADJ), as shown, to adjust the
output current to a value below the nominal
average value defined by RS.
RS L1
VIN 1 2
47uH
CIN
4.7uF
PWM
21
U1 D1
ADJ BL9581
CIN
4.7uF
VADJ
21
U1 D1
ADJ BL9581
The average output current is given by:
IOUT = 0.1×VADJ (0.3V VADJ 1.2V )
1.2 × RS
Note that 100% brightness setting
corresponds to: (1.3VVADJ5V)
Output current adjustment by PWM
control
A Pulse Width Modulated (PWM) signal
PWM dimming provides reduced
brightness by modulating the LED’s
forward current between 0% and 100%.
The LED brightness is controlled by
adjusting the relative ratios of the on time
to the off time. A 25% brightness level is
achieved by turning the LED on at full
current for 25% of one cycle. To ensure
this switching process between on and off
state is invisible by human eyes, the
switching frequency must be greater than
100 Hz. Above 100 Hz, the human eyes
average the on and off times, seeing only
an effective brightness that is proportional
to the LED’s on-time duty cycle. The
advantage of PWM dimming is that the
forward current is always constant,
therefore the LED color does not vary with
brightness as it does with analog dimming.
Pulsing the current provides precise
brightness control while preserving the
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
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