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PDF ADD5211 Data sheet ( Hoja de datos )
| Número de pieza | ADD5211 | |
| Descripción | White LED Driver | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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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.
http://www.DataSheet4U.net/
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
Document Feedback
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
©2013 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
datasheet pdf - http://www.DataSheet4U.net/
1 page  
Preliminary Technical Data
TYPICAL APPLICATIONS CIRCUITS
18V ~ 36V
+ CIN
20µF
RUVLO1
100kΩ
RUVLO2
7.5kΩ
CIN2
0.1µF
L1
33µH
RON
20Ω
D1
S310
MOSFET1
FDD86012LZ
22 LEDs/CH, 100mA/CH
COUT
10µF
CBYPASS2
1µF
OFF ON
VCC_RECEIVER
RPULL_UP
10kΩ
RLSD1 CBYPASS1
24kΩ
1µF
RLSD2
4.7kΩ
RSET
15kΩ
UVLO
VDR
EN
PWM
VIN GATE_P GATE_N
CS
RAMP
PGND
RRAMP
6.8kΩ
RCS
0.1Ω
ADD5211
OVP
FAULT
VDD
LSD
ISET
AGND FREQ COMP
FB4
FB3
FB2
FB1
LGND
SS
RFREQ
47kΩ
RC
68Ω
CC
2.2µF
CC2
OPEN
CSS
30nF
ROVP1
560kΩ
ROVP2
16kΩ
Figure 4. Typical Four-String Application Circuit
http://www.DataSheet4U.net/
18V ~ 36V
+ CIN
20µF
RUVLO1
100kΩ
RUVLO2
7.5kΩ
CIN2
0.1µF
L1
33µH
RON
20Ω
D1
S310
MOSFET1
FDD86012LZ
22 LEDs/CH, 100mA/CH
COUT
10µF
CBYPASS2
1µF
OFF ON
VCC_RECEIVER
RPULL_UP
10kΩ
RLSD1 CBYPASS1
24kΩ
1µF
RLSD2
4.7kΩ
RSET
15kΩ
UVLO
VDR
EN
PWM
VIN GATE_P GATE_N
CS
RAMP
PGND
RRAMP
6.8kΩ
RCS
0.1Ω
ADD5211
OVP
FAULT
VDD
LSD
ISET
AGND FREQ COMP
FB4
FB3
FB2
FB1
LGND
SS
RFREQ
47kΩ
RC
68Ω
CC
2.2µF
CC2
OPEN
CSS
30nF
ROVP1
560kΩ
ROVP2
16kΩ
Figure 5. Typical Two-String Application Circuit
Rev. PrA | Page 5 of 6
ADD5211
datasheet pdf - http://www.DataSheet4U.net/
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet ADD5211.PDF ] | |
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