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PDF BL9580 Data sheet ( Hoja de datos )
| Número de pieza | BL9580 | |
| Descripción | High Brightness LED Driver | |
| Fabricantes | BELLING | |
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BL9580
36V, 1.4A Step-down
High Brightness LED Driver with Internal Switch
FEATURES
DESCRIPTION
Simple low parts count
The BL9580 is a continuous mode inductive
Internal 36V NDMOS switch
Up to 1.4A output current
step-down converter, designed for driving
Step-DowsninCgleonorvemrutlteiprle series connected LEDs
Single pin on/off and brightness control
using DC voltage or PWM
efficiently from a voltage source higher than,
the LED voltage. The device operates from
Soft Start
an input supply between 6V and 36V and
High efficiency (up to 97%)
provides an externally output current up to
Wide input voltage range: 6V to 36V
1.4A. Depending upon supply voltage and
Output shutdown
external components, this can provides up to
Up to 1MHz switching frequency
24 watts of output power.
Inherent open-circuit LED protection
The BL9580 includes the output switch and a
Typical 3% output current accuracy
high-side output current sensing circuit, which
High-side current sense
uses an external resistor to set the nominal
Hysteretic control: no compensation
average output current.
Adjustable constant LED current
Output current can be adjusted by applying
Over temperature protection
an external control signal to the 'ADJ' pin.
Pb-free SOT89-5 and SOP-8 packages
The ADJ pin will accept either a DC voltage
or a PWM waveform. During DC dimming,
APPLICATIONS
this will provide a continuous output current
that is proportional to the external applied DC
Low voltage halogen replacement LEDs
voltage. During the PWM dimming, this will
Automotive lighting
provide a gated output current and the
Low voltage industrial lighting
average current is proportional to the duty
LED back-up lighting
cycle. Applying a voltage of 0.2V or lower to
Illuminated signs
the ADJ pin turns the output off and switches
LCD TV backlighting
the device into a low current standby state.
ORDERING INFORMATION
BL9580 X XXX
Package:
SRN: SOT89-5
SP8:SOP8
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
BL9580
GND
LX
PPMIC BU
BL9580 Rev 1.8
11/2012
www.belling.com.cn
Belling Proprietary Information. Unauthorized Photocopy and Duplication Prohibited
©2010 Belling All Rights Reserved
1
1 page  
BL9580
36V, 1.4A 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 curreSnttep-Down Converter
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
1.4
480
A
,
ns
25 ns
1 MHz
160 °C
20 °C
Note 7: 100% production test at +25°C. Specifications over the temperature range are guaranteed by design and
characterization.
PPMIC BU
BL9580 Rev 1.8
11/2012
www.belling.com.cn
Belling Proprietary Information. Unauthorized Photocopy and Duplication Prohibited
©2010 Belling All Rights Reserved
5
5 Page 
BL9580
36V, 1.4A Step-down
High Brightness LED Driver with Internal Switch
or applied with a voltage higher than 1.2V Output current adjustment by PWM
(must be less than or equal to 5V). Actually, control
RS sets the maximum average current
which can be adjusted to a less one by A Pulse Width Modulated (PWM) signal
dimming.
Step-DowwnithCduotny vcyecrletePrWM can be applied to the
The table below gives values of nominal ADJ pin, as shown below, to adjust the,
average output current for several output current to a value below the nominal
preferred values of current setting resistor average value set by resistor RS:
(RS) in the typical application circuit shown
on page 1.
Nominal average output current (mA) RS()
1000
0.1
IOUT 0.1 D (0 D 100%,1.2V VADJ 5V )
RS
760
667
0.13
0.15
IOUT VPULSE 0.1 D (0 D 100%, 0.3V VPULSE 1.2V )
1.2 RS
333 0.3
Output current adjustment by external
DC control
VIN
RS L1
12
47uH
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 BL9580
CIN
4.7uF
VADJ
21
D1
U1
ADJ BL9580
The average output current is given by:
IOUT 0.1VADJ (0.3V VADJ 1.2V )
1.2 RS
Note that 100% brightness setting
corresponds to: (1.3V≤VADJ≤5V)
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;
PPMIC BU
BL9580 Rev 1.5
2/2010
www.belling.com.cn
Belling Proprietary Information. Unauthorized Photocopy and Duplication Prohibited
©2010 Belling All Rights Reserved
11
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet BL9580.PDF ] | |
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