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BL9581 데이터시트 PDF




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부품번호 BL9581 기능
기능 High Brightness LED Driver
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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 pdf, 반도체, 판매, 대치품
BL9581
36V, 1.2A Step-down
High Brightness LED Driver with Internal Switch
Electrical Characteristics (Note 6)
(Test conditions: VIN =12V, TA = 25°C, unless otherwise noted.)
Symbol
Parameter
Conditions
VIN
VUVLO
Input voltage
Under voltage lock out
VIN Rising
VUVLO(HYS)
UVLO hysteresis
VIN falling
IQ(OFF)
IQ(ON)
VISENSE
Quiescent supply current with
output off
Quiescent supply current with
output switching
Mean current sense
threshold voltage
ADJ Pin grounded
ADJ Pin floating
f=250KHz
Measure on ISENSE pin
with respect to VIN
VSENSE(HYS)
Sense threshold hysteresis
ISENSE
VADJ
IADJ
RADJ
VADJ(OFF)
VADJ(ON)
VADJ(H)
VADJ(L)
VADJ(DC)
fADJ
DPWM(LF)
DPWM(HF)
ISENSE pin input current
ADJ pin floating voltage
ADJ pin leakage current
ADJ pin pull up resistor to
internal supply voltage
DC voltage on ADJ pin to
switch device from active (on)
state to quiescent (off) state
DC voltage on ADJ pin to
switch device from quiescent
(off) state to active (on) state
Digital dimming ADJ pin
input voltage high
Digital dimming ADJ pin
input voltage low
DC brightness control
Recommended Digital
dimming frequency
Duty cycle range of PWM
signal applied to ADJ pin
during low frequency
PWM dimming mode
Brightness control range
Duty cycle range of PWM
signal applied to ADJ pin
during high frequency
PWM dimming mode
VISENSE=VIN-0.1
ADJ pin floating
ADJ pin grounded
VADJ falling .
VADJ rising
fADJ =100Hz
fADJ =10KHz
Brightness control range
RLX
ILX(LEAK)
LX switch on resistance
LX switch leakage
MIN TYP MAX Unit
6 36 V
5.07 V
4.87 V
50 100 μA
1.8 50 mA
97 100 103 mV
±15 %
1.2 10 μΑ
5V
5 μΑ
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
1000:1
5 100
%
%
20:1
0.35 0.7
0.1 5
Ω
μΑ
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
4

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BL9581 전자부품, 판매, 대치품
BL9581
36V, 1.2A Step-down
High Brightness LED Driver with Internal Switch
Operating Frequency Vs. Supply Voltage
L=47uH
600
550 1LED
500 2LED
450 3LED
4LED
400 5LED
350 6LED
300
250
200
150
100
50
0
5 10 15 20 25 30
Supply Voltage VIN(V)
1.08
1.06
1.04
1.02
1.00
0.98
0.96
0.94
5
Output Current Vs. Supply Voltage
L=47uH
1LED
2LED
3LED
4LED
5LED
6LED
10 15 20 25
Supply Voltage VIN(V)
30
Operating Frequency Vs. Supply Voltage
L=100uH
300
1LED
250 2LED
3LED
4LED
200 5LED
6LED
150
100
50
0
5 10 15 20 25 30
Supply Voltage VIN(V)
Duty Cycle Vs. Supply Voltage
L=47uH
100
90
80
70
60
50
40 1LED
30 2LED
3LED
20 4LED
5LED
10 6LED
0
5 10 15 20 25
Supply Voltage VIN(V)
30
Output Current variation Vs. Supply Voltage
L=100uH
5
4 1LED
3
2LED
3LED
2 4LED
5LED
1 6LED
0
-1
-2
-3
-4
-5
5 10 15 20 25 30
Supply Voltage VIN(V)
Duty Cycle Vs.Supply Voltage
L=100uH
100
90
80
70
60
50
40 1LED
2LED
30 3LED
4LED
20 5LED
10 6LED
0
5 10 15 20 25
Supply Voltage VIN(V)
30
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
7

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