MAX1996AETI+ Maxim Integrated Products, MAX1996AETI+ Datasheet - Page 9

• Manufacturer Part Number: MAX1996AETI+
• Description: Display Drivers CCFL Backlight Controller
• Manufacturer: Maxim Integrated Products

Specifications of MAX1996AETI+

• Lead Free Status / Rohs Status: Details

The MAX1996A is optimized to drive CCFLs using a
synchronized full-bridge inverter architecture. The drive
to the full-bridge MOSFETs is synchronized to the reso-
nant frequency of the tank circuit so that the CCFL’s
full-strike voltage develops for all operating conditions.
The synchronized architecture provides near sinusoidal
drive waveforms over the entire input range to maxi-
mize the life of CCFLs. The MAX1996A operates over a
wide input voltage range (4.6V to 28V), achieves high
efficiency, and maximizes dimming range.
The MAX1996A regulates the brightness of a CCFL in
three ways:
1) Linearly controlling the lamp current.
Figure 1. Standard Application Circuit
C9
C7
C8
_______________________________________________________________________________________
R4
D2-1
C5
Detailed Description
R3
C10
LX1
BST1
GND
Range, CCFL Backlight Controller
High-Efficiency, Wide Brightness
NH1
NL1
MAX1996A
NH2
NL2
BST2
ILIM
LX2
C1
2) Digitally pulse-width modulating (or chopping) the
3) Using both methods simultaneously for widest dim-
DPWM is implemented by pulse-width modulating the
lamp current at a rate faster than the eye can detect.
The MAX1996A includes a 5.3V linear regulator to
power the drivers for full-bridge switches, the synchro-
nizable DPWM oscillator, and most of the internal cir-
cuitry. The MAX1996A is very flexible and can be
controlled with an analog interface or with an SMBus
interface.
C2
D2-2
C6
lamp current (DPWM).
ming range.
T1
C3
C4
R2
CCFL
D1
VIN
5V TO 28V
ON/OFF
REFERENCE INPUT
CONTROL INPUT
R1
9