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LM3530 Datasheet(PDF) 11 Page - Texas Instruments

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No. de pieza LM3530
Descripción Electrónicos  High-Efficiency White-LED Driver
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Fabricante Electrónico  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
Logo TI1 - Texas Instruments

LM3530 Datasheet(HTML) 11 Page - Texas Instruments

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background image
I
2C/CONTROL
¦
gm
R
S
R
R
R
R
Osc/
Ramp
Thermal
shutdown
Light
Load
OVP
Over
Current
Protection
RZ
CC
Driver
SOFT START
HWEN
SCL
SDA
ILED
IN
OVP
SW
400mV
+
-
ERROR
AMP
BRT
Register
ALS Select
1
0
7 bits
7 bits
LED Ramp
Rate Control
3 bits
Ramp Rate
Increasing
7 bits
DAC
Active Zone
Target
Register
7 bits
Dig Code
3 bits
Ramp Rate
Decreasing
Full Scale
Current
1bit
Mapping Mode Select Bit
(0 = Exponental, 1 = Linear)
Full Scale Current
Select Bits
LPF
PWM
EN_PWM bit
PWM Polarity Bit
(0 = active high, 1 =
active low)
Note 1
Note 2
Note 3
PWM
D
CODE
A
)
30
5
(
mA
mA -
FS
I
GND
ADC
Zone Boundaries
X 4
8 bits
Averager/
Discriminator
Zone Targets X 5
7 bits
ALS2 Resistor
Select (4 Bits)
ALS1
ALS2
ALS1 Resistor
Select (4 Bits)
ALS Input Select
40V
250m:
140C
INT
Zone Change
Flag
Zone Change
Flag
Current Control
Boost Control
For EN_PWM bit = 1
ILED = IFS
ACODE
DPWM
For EN_PWM bit = 0
Note 3:
ILED = IFS
ACODE
DPWM Is a Scaler between 0 and 1 and corresponds to the duty cycle of the PWM input signal
Note 2:
ACODE Is a Scaler between 0 and 1 based on the Brightness Data or Zone Target Data Depending on the ALS Select Bit
Note 1:
x
x
x
LM3530
www.ti.com
SNVS606L – JUNE 2009 – REVISED DECEMBER 2014
8 Detailed Description
8.1 Overview
The LM3530 utilizes an asynchronous step-up, current mode, PWM controller and regulated current sink to
provide an efficient and accurate LED current for white LED bias. The device powers a single series string of
LEDs with output voltages of up to 40 V and a peak inductor current of typically 839 mA. The input active voltage
range is from 2.7 V to 5.5 V.
8.2 Functional Block Diagram
Copyright © 2009–2014, Texas Instruments Incorporated
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