DESCRIPTION
The MP1048 is a fixed operating frequency
inverter controller that controls four external
N-Channel power MOSFETs in a full-bridge
configuration. The inverter is designed to power
up to 6 cold cathode fluorescent lamps (CCFLs)
to backlight liquid crystal displays. Its full-bridge
architecture converts unregulated DC input
voltages to the nearly pure sine waves required
to ignite and operate CCFLs.
For reliable lamp ignition, the operating
frequency is set by an external resistor and
during startup is temporarily swept toward the
unloaded resonant frequency of the tank. Burst
mode or analog mode dimming are controlled
with an external analog signal. Built-in fault
management features include an open lamp
regulator, a transformer secondary peak current
regulator and a dual-mode fault timer. The
secondary over-current timeout can be
shortened with external components. The
MP1048 is available in TSSOP28 and SOIC28
packages.

FEATURES
• Capable of Driving up to 6 Lamps
• Controls Four External, Low Cost, N-Channel
MOSFETs
• Fixed Operating Frequency
• Input Voltage Range of 10V to 22V
• Lamp Current and Voltage Regulation
• Full-Wave Sense Amp
• Analog and Burst Mode Dimming Control
• Integrated Burst Mode Oscillator and Modulator
• Soft-On and Soft-Off Burst Envelope
• Open Lamp Protection
• Secondary Over-Current Protection
• Dual-Mode Fault Timer
• Available in TSSOP28 and SOIC28 Packages
APPLICATIONS
• Desktop LCD Flat Panel Displays
• Monitors