MAX1611
Digitally Controlled CCFL Backlight Power Supplies
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SMBus™ Controlled CCFL Supply Provides Bright, Flicker-Free Operation and Protects Lamps
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Features
- Direct Digital Control of CCFL Brightness
- Low Supply Current:
- 3mA Max Operating
- 20µA Max Shutdown
- Low-Voltage Operation, Down to 4.5V
- Internal 26V, 0.7Ω Power Switch
- Protection Against Open or Shorted Lamps
- Supports Isolated Transformer Secondary Winding
- SMBus Serial Interface (MAX1611)
- No Flicker at Low Brightness (internal 280Hz current chopping)
- High Power-to-Light Efficiency
- Selectable 290kHz/145kHz Switching Frequency
- Oscillator SYNC Input
- 16-Pin Narrow SO Package
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The MAX1610/MAX1611 are fully integrated, high-efficiency drivers for cold-cathode fluorescent lamps (CCFLs). They operate from a 4.5V to 26V power source. An on-board, high-switching-frequency power MOSFET reduces external component count and magnetics size. The MAX1610/MAX1611 protect against open or shorted lamps. The CCFL can be driven from an isolated transformer secondary winding to improve efficiency and avoid flicker at dim tube settings. Brightness is adjusted by scaling the lamp current, or by operating with a fixed lamp current and chopping the CCFL on and off at a rate faster than the eye can detect.
The MAX1610's digital inputs increment, decrement, or clear an internal, 5-bit up/down counter, which sets CCFL brightness. The MAX1611 uses a System Management Bus (SMBus) 2-wire serial interface to directly set CCFL brightness. Both devices include micropower shutdown and a linear regulator that eliminates the need for a separate logic supply. The digital interface remains active in shutdown, preserving the brightness setting.
Applications
- Instrument Displays
- Notebook Computers
- Point-of-Sale Terminals
- Portable Medical Equipment
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MAX1611
Documentation
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Documentation
Evaluation Kits 2
MAX1611EVKIT
Evaluation Kit for the MAX1610, MAX1611
Product Detail
The MAX1611 evaluation kit (EV kit) is an assembled surface-mount demonstration board. The kit embodies the standard cold-cathode fluorescent lamp application circuit shown in Figure 4 of the MAX1610/MAX1611 data sheet. Additional circuitry allows an IBM®-compatible personal computer to use its parallel port to emulate an Intel System Management Bus (SMBus™) interface.
The board comes with a MAX1611 installed, but with minimal modification, the EV kit can also be used to evaluate the MAX1610.
Applications
- Instrument Displays
- Notebook Computers
- Point-of-Sale Terminals
- Portable Medical Equipment
MAX1610EVKIT
Evaluation Kit for the MAX1610, MAX1611
Product Detail
The MAX1611 evaluation kit (EV kit) is an assembled surface-mount demonstration board. The kit embodies the standard cold-cathode fluorescent lamp application circuit shown in Figure 4 of the MAX1610/MAX1611 data sheet. Additional circuitry allows an IBM®-compatible personal computer to use its parallel port to emulate an Intel System Management Bus (SMBus™) interface.
The board comes with a MAX1611 installed, but with minimal modification, the EV kit can also be used to evaluate the MAX1610.
Applications
- Instrument Displays
- Notebook Computers
- Point-of-Sale Terminals
- Portable Medical Equipment