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AOZ1977
High Voltage LED Driver IC
General Description
The AOZ1977 is a high-efficiency LED driver controller
for high voltage LED backlighting applications. It is
designed to drive a high-brightness LED light bar in LED
TV applications. The AOZ1977 can support a wide range
of input and output voltages. The input bias voltage of the
AOZ1977 is from 8 V to 30 V.
The AOZ1977 has multiple features to protect the
regulator under fault conditions. A control pin can disable
an external switch to disconnect the LEDs current path
from the output in PWM dimming or under catastrophic
failure conditions. Cycle-by-cycle current protection limits
the peak inductor current. Thermal shutdown provides an
additional level of protection.
Low feedback voltage (500 mV) helps reduce power loss.
The AOZ1977 features a sync function to allow for
synchronization with an external clock or multiple
AOZ1977 devices.
The AOZ1977 is available in a standard SO-16 package
and operates over the -40 ? C to +85 ? C temperature
range.
Typical Application
Features
? 8 V to 30 V input bias voltage
? Up to 16 V driving capability at GATE pin and
DPWM pin.
? Disconnect control pin for PWM dimming or fault
conditions.
? Bi-directional clock synchronization
? 500 mV feedback regulation
? 8 bit PWM dimming resolution
? Cycle-by-cycle current limit
? Output over-voltage protection
? LED short and open protection
? Thermal shutdown protection
? SO-16 package
Applications
? LCD TV LED backlight
? Monitor LED backlight
PVIN
L1
D1
8V-30V
C1
AOZ1977
RT
DBR
C2
1
VIN
FB
16
C3
C4
2
3
VDD
GATE
ISET
COMP
15
14
Q 1
RS
4
5
6
7
GND
CS
AUTO
OSC
DBRT
OVP
DPWM
VREF
13
12
11
10
Rov1
Q2
CAuto
8
Rosc
SYNC
ILIM
9
RL1
Rr1
Rc
Cc
RF FB
SYNC
RL2
Rr2
Rov2
Rev. 2.1 May 2012
www.aosmd.com
Page 1 of 16
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