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Part Number: MAX8722
Description: The MAX8722 integrated backlight controller is optimized to drive cold-cathode fluorescent lamps (CCFL...
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MAX8722
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General Description
MAX8722 General Description
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 regulato r 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.
MAX8722 Maximum Ratings
BATT to GND..........................................................-0.3V to +30V
BST1, BST2 to GND ...............................................-0.3V to +36V
BST1 to LX1, BST2 to LX2 .......................................-0.3V to +6V
CNTL, FREQ, SYNC, VCC, VDD to GND ......................-0.3V to +6V
COMP, DPWM, ILIM, TFLT to GND .............-0.3V to (VCC + 0.3V)
GH1 to LX1 ...........................................-0.3V to (VBST1 + 0.3V)
GH2 to LX2 ...........................................-0.3V to (VBST2 + 0.3V)
GL1, GL2 to GND .....................................-0.3V to (VDD + 0.3V)
IFB, ISEC, VFB to GND..............................................-3V to +6V
SHDN to GND.........................................................-0.3V to +6V
PGND to GND .....................................................-0.3V to +0.3V
Continuous Power Dissipation (TA = +70°C)
24-Pin QSOP (derate 9.5mW/°C above +70°C)......761.9mW
Operating Temperature Range .....................-40°C to +85°C
Junction Temperature..................................................+150°C
Storage Temperature Range .......................-65°C to +150°C
Lead Temperature (soldering, 10s) .............................+300°C
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional peration of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
MAX8722 Features
·Synchronized to Resonant Frequency Longer Lamp Life Guaranteed Striking Capability High Power to Light fficiency
·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 Typical Application
Notebook Computer Displays
LCD Monitors
LCD TVs
LCD Monitors
LCD TVs
MAX8722 Connection Diagram
MAX8722
PDF/DataSheet Download
- Datasheet: MAX8722
- File Size: 339759 KB
- Manufacturer: MAXIM [Maxim Integrated Products]
- Click here to Download
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