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MAX8722

Maxim Integrated Products
Part Number MAX8722
Manufacturer Maxim Integrated Products
Description Low-Cost CCFL Backlight Controller
Published Oct 5, 2009
Detailed Description 19-3321; Rev 0; 6/04 KIT ATION EVALU E L B A IL AVA Low-Cost CCFL Backlight Controller General Description Features ♦ ...
Datasheet PDF File MAX8722 PDF File

MAX8722
MAX8722

Overview
19-3321; Rev 0; 6/04 KIT ATION EVALU E L B A IL AVA Low-Cost CCFL Backlight Controller General Description Features ♦ Synchronized to Resonant Frequency Longer Lamp Life Guaranteed Striking Capability High Power to Light Efficiency ♦ Wide Input Voltage Range (4.
6V to 28V) ♦ Input-Voltage Feed-Forward for Excellent Line Rejection ♦ Accurate Dimming Control with Analog Interface ♦ 10:1 Dimming Range ♦ Adjustable Accurate DPWM Frequency with Sync Function ♦ Adjustable Lamp Current Rise and Fall Time ♦ Secondary Voltage Limit Reduces Transformer Stress ♦ Lamp-Out Protection with Adjustable Timeout ♦ Secondary Overcurrent Protection with Adjustable Timeout ♦ Low-Cost 24-Pin QSOP Package MAX8722 The MAX8722 integrated backlight controller is optimized to drive cold-cathode fluorescent lamps (CCFLs) using a full-bridge resonant inverter architecture.
Resonant operation maximizes striking capability and provides near-sinusoidal waveforms over the entire input range to improve CCFL lifetime.
The controller operates over a wide input voltage range (4.
6V to 28V) with high power to light efficiency.
The device also includes safety features that effectively protect against many single-point fault conditions including lamp-out and short-circuit faults.
The MAX8722 achieves 10:1 dimming range by “chopping” the lamp current on and off using a digital pulsewidth modulation (DPWM) method.
The DPWM frequency can be accurately adjusted with a resistor or synchronized to an external signal.
The brightness is controlled by an analog voltage on the CNTL pin.
The device directly drives the four external n-channel power MOSFETs of the full-bridge inverter.
An internal 5.
3V linear regulator powers the MOSFET drivers, the DPWM oscillator, and most of the internal circuitry.
The MAX8722 is available in a low-cost, 24-pin QSOP package and operates over a -40°C to +85°C temperature range.
Applications Notebook Computer Displays LCD Monitors LCD TVs www.
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