ADD5207 Datasheet PDF - Analog Devices


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ADD5207
Analog Devices

Part Number ADD5207
Description White LED Driver
Page 16 Pages

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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.
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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.
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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
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Data Sheet
FUNCTIONAL BLOCK DIAGRAM
VIN VDD
18
SHDN
10
UVP
REF
VOUT_FB
LINEAR
REGULATOR
VOLTAGE
REFERENCE
UVP
COMP
SHUTDOWN
500kΩ
THERMAL
SHUTDOWN
GND
ADD5207
ERROR
AMP
gm
LL
REF
LL COMP
PWM
COMP
COMP 11
DCOMP
DREF
OSC
+
+
HEADROOM CONTROL
ADD5207
OVP
13
SW
14
VOUT_FB
GND
OVP
REF
R
Q
S
2 FSLCT
CURRENT SENSE
SOFT START
VDD
ISET 3
REF
PWM 9
PWM
DUTY
EXTRACTOR
500kΩ
GND
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CURRENT SOURCE DRIVER
FPWM OSCILLATOR
LED OPEN/SHORT
FAULT DETECTOR
CURRENT SOURCE 1
CURRENT SOURCE 2
CURRENT SOURCE 3
CURRENT SOURCE 4
Figure 2. Functional Block Diagram
12 GND
4 FB1
5 FB2
6 FB3
7 FB4
Rev. A | Page 3 of 16
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ADD5207
Data Sheet
SPECIFICATIONS
STEP-UP SWITCHING REGULATOR SPECIFICATIONS
VIN = 12 V, SHDN = high, TA = −25°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.
Table 1.
Parameter
SUPPLY
Input Voltage Range
BOOST OUTPUT
Output Voltage
SWITCH
On Resistance
Leakage Current
Peak Current Limit
OSCILLATOR
Switching Frequency
Maximum Duty Cycle
SOFT START
Soft Start Time
OVERVOLTAGE PROTECTION
Overvoltage Rising Threshold on OVP Pin
Overvoltage Hysteresis on OVP Pin
Symbol
VIN
VOUT
RDS(ON)
ILKG
ICL
fSW
DMAX
tSS
VOVPR
VOVP_HYS
Test Conditions/Comments Min
6
VIN = 12 V, ISW = 100 mA
Duty cycle (D) = DMAX
RF = 97 kΩ
RF = 97 kΩ
1.5
800
84
36.5
0.1
Typ
150
1000
90
1.1
39
0.7
Max
21
36
300
1
1200
40
1.4
Unit
V
V
µA
A
kHz
%
ms
V
V
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Rev. A | Page 4 of 16
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