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Analog Devices Semiconductor Electronic Components Datasheet

ADD5207 Datasheet

White LED Driver

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Data Sheet
FEATURES
White LED driver based on inductive boost converter
Integrated 40 V MOSFET with 1.5 A peak current limit
Input voltage range: 6 V to 21 V
Maximum output adjustable up to 36 V
600 kHz to 1 MHz adjustable operating frequency
Typical 39 V fixed overvoltage protection (OVP)
Built-in soft start for boost converter
Drives up to 4 LED current strings
LED current adjustable up to 25 mA for each channel
Headroom control to maximize efficiency
Fixed LED dimming frequency: 8 kHz
LED open fault protection
Brightness control with PWM input
Dimming controls
4-channel operation: 90 degree phase shift between
channels
3-channel operation: 120 degree phase shift between
channels
General
Thermal shutdown
Undervoltage lockout
14-lead, 4 mm × 3 mm LFCSP
APPLICATIONS
Notebook PCs, UMPCs, and monitor displays
Four-String, White LED Driver
for LCD Backlight Applications
ADD5207
GENERAL DESCRIPTION
The ADD5207 is a white LED driver for backlight applications
based on high efficiency, current mode, step-up converter tech-
nology. It is designed with a 0.15 Ω, 1.5 A internal switch and a
pin-adjustable operating frequency between 600 kHz and 1 MHz.
The ADD5207 contains four regulated current sources for
uniform LED brightness. Each current source can drive up to
25 mA and the LED-driving current is pin adjustable by an
external resistor. The ADD5207 drives up to four parallel
strings of multiple series-connected LEDs with a ±1.5% current
matching between strings.
The ADD5207 provides phase shift PWM brightness control
methods. LED dimming control is achieved through the PWM
input. The device includes an 8 kHz LED-dimming oscillator
for driving each current source. The ADD5207 operates over an
input voltage range of 6 V to 21 V, but the device can function
with a voltage as low as 5.6 V.
The ADD5207 also has multiple safety protection features to
prevent damage during fault conditions. If any LED is open, the
device automatically disables the faulty current source. The
internal soft start circuit prevents a high inrush current during
http://www.DataSheet4U.net/ startup. Thermal shutdown protection prevents thermal damage.
The ADD5207 is available in a low profile, thermally enhanced,
4 mm × 3 mm × 0.75 mm, 14-lead, RoHS-compliant lead frame
chip scale package (LFCSP) and is specified over the industrial
temperature range of −25°C to +85°C.
VIN
+
CIN
10µF
CIN2
0.1µF
TYPICAL APPLICATION CIRCUIT
L1
10µH
1 VIN
D1 COUT
14 13 4µF
SW OVP
9 PWM
ADD5207
OFF ON
CBYPASS
1µF
RF
100kΩ
10 SHDN
8 VDD
2 FSLCT
ISET
3
COMP
11
RSET
180kΩ
RC
6.8kΩ
CC
2.2nF
FB1 4
FB2 5
FB3 6
FB4 7
GND
12
C2
OPEN
Figure 1.
Rev. A
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityisassumedbyAnalogDevices for itsuse,nor foranyinfringementsofpatentsor other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113 ©2009–2012 Analog Devices, Inc. All rights reserved.
datasheet pdf - http://www.DataSheet4U.net/


Analog Devices Semiconductor Electronic Components Datasheet

ADD5207 Datasheet

White LED Driver

No Preview Available !

ADD5207
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
General Description ......................................................................... 1
Typical Application Circuit ............................................................. 1
Revision History ............................................................................... 2
Functional Block Diagram .............................................................. 3
Specifications..................................................................................... 4
Step-Up Switching Regulator Specifications............................. 4
LED Current Regulation Specifications .................................... 5
General Specifications ................................................................. 6
Absolute Maximum Ratings............................................................ 7
Thermal Resistance ...................................................................... 7
ESD Caution.................................................................................. 7
Pin Configuration and Function Descriptions............................. 8
REVISION HISTORY
2/12—Rev. Sp0 to Rev. A
Replaced Block Diagram with Typical Application Circuit........ 1
Changes to Features Section and General Description Section . 1
Changes to Current Mode, Step-Up Switching Regulator
Operation Section, Boost Converter Switching Frequency
Section, PWM Dimming Mode Section, Phase Shift PWM
Dimming Section, and Safety Features Section.......................... 11
Data Sheet
Typical Performance Characteristics ..............................................9
Theory of Operation ...................................................................... 11
Current Mode, Step-Up Switching Regulator Operation ..... 11
Internal 3.3 V Regulator ............................................................ 11
Boost Converter Switching Frequency.................................... 11
Dimming Frequency (fPWM) ...................................................... 11
Current Source............................................................................ 11
PWM Dimming Mode .............................................................. 11
Safety Features ............................................................................ 11
External Component Selection Guide..................................... 12
Layout Guidelines....................................................................... 13
Typical Application Circuits ......................................................... 15
Outline Dimensions ....................................................................... 16
Ordering Guide .......................................................................... 16
Changes to Overvoltage Protection (OVP) Section .................. 11
Changes to Open-Loop Protection (OLP) Section,
Undervoltage Lockout (UVLO) Section, and Thermal
Protection Section .......................................................................... 12
Changeshttp://www.DataSheet4U.net/ to Layout Guidelines Section ........................................ 13
7/09—Revision Sp0: Initial Version
Rev. A | Page 2 of 16
datasheet pdf - http://www.DataSheet4U.net/


Part Number ADD5207
Description White LED Driver
Maker Analog Devices
Total Page 16 Pages
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