LED Driver. AOZ1960 Datasheet

AOZ1960 Driver. Datasheet pdf. Equivalent


Alpha & Omega Semiconductors AOZ1960
AOZ1960
Multi-String Boost White LED Driver
General Description
The AOZ1960 is a high-efficiency boost regulator with
integrated 55V boost switch and 30V input protection
switch. It is designed to drive 6 parallel strings of multiple
series-connected white LEDs for LCD backlight
applications. The current of each string is individually
regulated by an internal current regulator. The AOZ1960
has a wide input voltage range from 7V to 24V. The
maximum LED current can be adjusted from 15mA to
30mA using an external resistor connected to ISET pin.
The AOZ1960 support two dimming control modes to
enable a wide variety of applications. In analog dimming
mode, the LED current can be directly adjusted through
ABRT pin to achieve 10% to 100% brightness range.
In digital dimming mode, a PWM signal on DBRT controls
the brightness by turning the current regulators on and
off. The brightness is proportional to the duty cycle of the
PWM signal.
The AOZ1960 has multiple features to protect the
regulator under fault conditions. An internal 30V input
protection switch protects against catastrophic failure
conditions such as output short-circuits. A separate
over-voltage protection (OVP) loop limits the output
voltage if LED strings fail open. Cycle-by-cycle
over-current protection (OCP) limits the peak inductor
current. Built-in soft-start minimizes the inrush current
during startup. Thermal shutdown provides another level
of protection.
The integrated 55V power MOSFET reduces the cost
and external component count, while allowing output
voltages as high as 55V. Low dropout voltage of LED
current regulator (500mV) minimizes power loss. In
addition, automatic pulse skipping operation improves
efficiency at light loads. The AOZ1960 features
programmable switching frequency allows for trade-offs
between solution size and electrical efficiency.
The AOZ1960 is available in a thermally enhanced
24-pin 7mm x 4mm DFN package and operates over the
temperature range of -40°C to +85°C.
Features
z 7V to 24V input voltage range
z Integrated 30V input switch
z 55V/2A internal N-channel MOSFET
z Six parallel strings
z Programmable switching frequency
z 500mV low dropout current regulator
z Resistor programmable maximum LED current
z Analog dimming via ABRT pin
z Digital PWM dimming via DBRT pin
z Dimming range with 8-bit resolution
z Cycle-by-cycle current limit
z Open and short LED protection
z Output over-voltage and short protection
z Thermal overload protection
z Internal Soft-start
z 7mm x 4mm DFN package
Applications
z Notebook PC display
z Tablet PC display
z Desktop monitors
z Portable DVD players
z Digital photo frames
z Car navigation display
Rev. 1.0 August 2010
www.aosmd.com
Page 1 of 20


AOZ1960 Datasheet
Recommendation AOZ1960 Datasheet
Part AOZ1960
Description Multi-String Boost White LED Driver
Feature AOZ1960; AOZ1960 Multi-String Boost White LED Driver General Description The AOZ1960 is a high-efficiency bo.
Manufacture Alpha & Omega Semiconductors
Datasheet
Download AOZ1960 Datasheet




Alpha & Omega Semiconductors AOZ1960
Typical Application Circuit
INPUT
6V TO 24V
R9
1kΩ
C1
22μF
IN
LIN
L1
10μH
LX
D1
OVP
C5
1μF
R3
100kΩ
FAULT
BIAS
AGND
PGND
AOZ1960DI
COMP
FLT
ENABLE
ANALOG
DIMMING
DIGITAL
DIMMING
R6
84.5kΩ
EN
ABRT
DBRT
FSET
ISET
LED1
LED2
LED3
LED4
LED5
LED6
R1
500kΩ
R2
12.5kΩ
C4
4.7μF
C8
4.7μF
R5
10kΩ
C6
100nF
R4
46.4kΩ
AOZ1960
Ordering Information
Part Number
AOZ1960DI
Ambient Temperature Range
-40°C to +85°C
Package
7 x 4 DFN-24
AOS Green Products use reduced levels of Halogens, and are also RoHS compliant.
Please visit www.aosmd.com/web/quality/rohs_compliant.jsp for additional information.
Environmental
Green Product
Rev. 1.0 August 2010
www.aosmd.com
Page 2 of 20



Alpha & Omega Semiconductors AOZ1960
Pin Configuration
IN 1
EN 2
BIAS 3
ISET 4
AGND 5
COMP 6
FSET 7
AGND 8
ABRT 9
DBRT 10
FLT 11
OVP 12
AOZ1960DI
LIN
AGND
LX
24 LIN
23 LIN
22 LED1
21 LED2
20 LED3
19 AGND
18 LED4
17 LED5
16 LED6
15 PGND
14 LX
13 LX
7x4 DFN-24
(Top View)
AOZ1960
Rev. 1.0 August 2010
www.aosmd.com
Page 3 of 20





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