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STEVAL-ISA056V1
6 row, 30 mA LED driver with boost converter for LCD panel backlight based on PM6600

 
 Features and Description  Technical Documentation  Resources
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Features and Description
Boost section
– 4.5 V to 28 V input voltage range
– Internal Power MOSFET
– Internal +5 V LDO for device supply
– Up to 36 V output voltage
– Constant frequency peak current-mode control
– 200 kHz to 1 MHz adjustable switching frequency
– External sync for multi-device applications
– Pulse-skip power saving mode at light load
– Programmable soft-start
– Programmable OVP protection
– Single ceramic output capacitor
– Latched thermal shutdown
Backlight driver section
– Six rows with 30 mA maximum current capability (adjustable)
– Up to 10 W of LEDs per row
– Row disable option
– Less than 500 ns minimum dimming time (1% minimum dimming duty-cycle at 20 kHz dimming frequency)
– ±2.0% current matching between rows
– LED failure detection (open and short circuit)

Click for larger imageThis evaluation board, based on the PM6600, consists of a high-efficiency monolithic boost converter and six controlled-current generators (rows) specifically designed to supply LED arrays used in the backlighting of LCD panels. The device can manage an output voltage up to 36 V (that is ten white LEDs per row).

The generators can be externally programmed to sink up to 30 mA and can be dimmed via a PWM signal (1% dimming duty-cycle at 20 kHz can be managed). The device detects and manages open and shorted LED faults and leaves unused rows floating. Basic protective features are provided (output overvoltage, internal MOSFET overcurrent and thermal shutdown).

Technical Documentation
Data brief Download
Resources
Gerber Files Download (23-January-2008, 151 KB)
Schematics Download (23-January-2008, 24 KB)
Bill of material Download (28-May-2008, 56 KB)
Key Products
STPS1L40M 
BAS69 
PM6600 
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