ADD5211 Datasheet PDF - Analog Devices


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ADD5211
Analog Devices

Part Number ADD5211
Description White LED Driver
Page 6 Pages

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Preliminary Technical Data
Four-String, White LED Driver
for LCD Backlight Applications
ADD5211
FEATURES
White LED driver based on an inductive boost controller
Wide input voltage range: 4.5 V to 40 V
Adaptive output voltage to minimize power dissipation
Adjustable operating frequency: 200 kHz to 1.2 MHz
Programmable UVLO
Programmable soft start time for boost converter
Programmable external MOSFET switching rising/falling time
Drives up to 4 LED current sinks with internal MOSFETs
Brightness control with PWM input
Adjustable LED current: 40 mA up to 200 mA
Headroom control to maximize efficiency
LED dimming frequency: up to 25 kHz
1000:1 PWM dimming at 300 Hz
Open drain fault indicator
LED open and LED short fault protection
Thermal shutdown
Undervoltage lockout
24-lead, 4 mm × 4 mm LFCSP
APPLICATIONS
LCD monitor and TV LED backlights
Industrial lighting
GENERAL DESCRIPTION
The ADD5211 is a 4 channel, white LED driver for backlight
applications based on high efficiency, current mode, step-up
converter technology. The boost controller drives an external
MOSFET switch for step-up regulation from an input voltage of
4.5 V to 40 V and a pin adjustable operating frequency between
200 kHz and 1.2 MHz. An adjustable UVLO function is
implemented to reduce input current during power-off.
The ADD5211 contains four regulated current sinks for uniform
brightness intensity. Each current sinks can be driven from 40
mA up to 200 mA and the LED driving current is pin adjustable
by an external resistor. The ADD5211 with an input PWM
interface drives up to four parallel strings of multiple series
connected LEDs with ±1.5% current matching between strings.
Additional features include fault indicator output LED short
protection, LED open protection, boost output short protection,
overvoltage protection, cycle-by-cycle current limit, and
thermal shutdown for both the IC and LED array. The
programmable soft start is implemented to reduce inrush
current during startup.
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TYPICAL APPLICATION
+
VIN
OFF ON
UVLO
VDR
VIN GATE_P GATE_N
CS
EN
PWM
RAMP
ADD5211
PGND
OVP
FAULT
VDD
LSD
ISET
AGND FREQ COMP
FB4
FB3
FB2
FB1
LGND
SS
Figure 1.
Rev. PrA
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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
©2013 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
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ADD5211
Preliminary Technical Data
DETAILED FUNCTIONAL BLOCK DIAGRAM
OVP
BOOST CONTROL
COMP
FB_REF
FB_MIN
gm
ERROR
AMP
FREQ
PWM
COMP
OVP
OVP REF
BOOST
SCP REF
OVP
SCP
POR
OSC
RAMP
DREF
DCOMP
ADD5211
+
+
OVP
R
Q
SR
VDR
SWITCH
DRIVER
START-UP
SOFT START
CURRENT SENSE
GATE_P
GATE_N
PGND
SS
CS
RAMP
×10 LSD
POR
FAULT
VDR
FAULT
DETECTOR
LINEAR
REGULATOR
VIN DEVICE
ENABLE
EN
500kΩ
AGND
AGND
UVLO
UVLO
DETECTOR
BANDGAP
REFERENCE
VOLTAGE
REFERENCE
VDD
POR
THERMAL
SHUTDOWN
OPEN
STRING
DETECTOR
SHORT
STRING
DETECTOR
UNUSED
STRING
DETECTOR
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FB_MIN
STRING
VOLTAGE
DETECTOR
CURRENT SOURCE1
CURRENT SOURCE2
CURRENT SOURCE3
FB1
FB2
FB3
PWM
500kΩ
CONTROL LOGIC
AGND
THERMAL
SHUTDOWN
BOOST
SHORT
BOOST CONTROL
START-UP
DIMMING CONTROL
VDD
REF
CURRENT SOURCE
FB4
DIMMING CONTROL
ISET
Figure 2.
LGND
Rev. PrA | Page 2 of 6
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Preliminary Technical Data
ABSOLUTE MAXIMUM RATINGS
TA = 25°C, unless otherwise noted.
Table 1.
Parameter
VIN, UVLO
FB1, FB2, FB3, FB4
EN
PWM, FAULT
VDR, GATE_N, GATE_P
VDD, LSD , OVP, CS, RAMP, SS
FREQ, ISET, COMP
AGND, PGND, LGND
Maximum Junction Temperature (TJ max)
Operating Temperature Range (TA)
Storage Temperature Range (TS)
Reflow Peak Temperature (20 sec to 40 sec)
Rating
−0.3 V to +45 V
−0.3 V to +55 V
−0.3 V to +20 V
−0.3 V to +10 V
−0.3 V to +7 V
−0.3 V to +3.7 V
−0.3 V to +3.5 V
−0.3 V to +0.3 V
150°C
−25°C to +85°C
−65°C to +150°C
260°C
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
ADD5211
THERMAL RESISTANCE
θJA is specified for the worst-case conditions, that is, a device
soldered in a circuit board for surface-mount packages.
Table 2. Thermal Resistance
Package Type
24-Lead LFCSP
θJA
40.5
θJC
3.8
Unit
°C/W
ESD CAUTION
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Rev. PrA | Page 3 of 6
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ADD5211
PIN CONFIGURATION AND FUNCTION
DESCRIPTIONS
VDR 1
UVLO 2
VIN 3
EN 4
PWM 5
FAULT 6
ADD5211
TOP VIEW
18 OVP
17 FB4
16 FB3
15 LGND
14 FB2
13 FB1
NOTES
1. CONNECT THE EXPOSED PADDLE TO GROUND.
Figure 3. Pin Configuration
Table 3. Pin Function Descriptions
Pin
No. Mnemonic Description
1 VDR
Switching MOSFET Gate Driver Supply Pin.
Bypass VDR to AGND with a 1 µF bypass
capacitor.
2 UVLO
Input Undervoltage Lockout. Set the start-
up and shutdown input voltage level by
connecting this pin to the input voltage
through a voltage divide resistor.
3 VIN
Supply Input Pin. Bypass VIN to AGND with
a 1 µF bypass capacitor.
4 EN
Shutdown Control Pin for PWM Input
Operation Mode.
5 PWM
PWM Signal Input.
6 FAULT
Open Drain Fault Output.
7 SS
Soft Start Pin.
8 COMP
Compensation for the Boost Converter. Two
capacitors and a resistor are connected in
series between ground and this pin for
stable operation.
9 FREQ
Frequency Select. A resistor from this pin to
Preliminary Technical Data
Pin
No. Mnemonic Description
ground sets the boost switching frequency
from 200 kHz to 1.2 MHz.
10 ISET
Full-Scale LED Current Set. A resistor from
this pin to ground sets the LED current up
to 200 mA.
11 VDD
Internal Linear Regulator Output. This
regulator provides power to the ADD5211.
Bypass VDD to AGND with a 1 µF bypass
capacitor.
12 LSD
LED Short Voltage Level Setting Pin. To
disable LED short protection, connect this
pin to VDD.
13 FB1
Regulated Current Sink. Connect the
bottom cathode of the LED string to this
pin. If unused, connect FB1 to LGND.
14 FB2
Regulated Current Sink. Connect the
bottom cathode of the LED string to this
pin. If unused, connect FB2 to LGND.
15 LGND
LED Current Sink Ground.
16 FB3
Regulated Current Sink. Connect the
bottom cathode of the LED string to this
pin. If unused, connect FB3 to LGND.
17 FB4
Regulated Current Sink. Connect the
bottom cathode of the LED string to this
pin. If unused, connect FB4 to LGND.
18 OVP
Overvoltage Protection. The boost
converter output is connected to this pin
with voltage divide resistors.
19http://www.DataSheet4U.net/
PGND
Power Ground.
20 RAMP
Ramp Compensation Pin.
21 CS
Current Sense Input. Allows the current
sensing to control the boost and to limit the
switching current.
22 GATE_N
Switching MOSFET Gate Low Driving Pin.
23 GATE_P
Switching MOSFET Gate High Driving Pin.
24 AGND
Analog Ground.
EP Exposed Paddle. Connect the exposed
paddle to ground.
Rev. PrA | Page 4 of 6
datasheet pdf - http://www.DataSheet4U.net/




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