Product overview
Description
The PM6600 consists of a high efficiency monolithic boost converter and six controlled current generators (ROWs), specifically designed to supply LEDs arrays used in the backlight of LCD panels. The device can manage a nominal output voltage up to 36 V (i.e. 10 White-LEDs per ROW). The generators can be externally programmed to sink up to 32 mA and they can be dimmed via a PWM signal (1% dimming dutycycle at 20 kHz can be managed). The device allows to detect and manage the open and shorted LED faults and to let unused ROWs floating. Basic protections (output over-voltage, internal MOSFET over-current and thermal shutdown) are provided.
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All features
- Boost section
4.7 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 synchronization for multi-device application Pulse-skip power saving mode at light load Programmable soft-start Programmable OVP protection Stable with ceramic output capacitors Thermal shutdown - Backlight driver section
Six rows with 32 mA maximum current capability (adjustable) Up to 10 WLEDs per row Unused rows detection 500 ns minimum dimming time (1 % minimum dimming duty-cycle at 20 kHz) ± 2.1 % current accuracy ± 2 % current matching between rows LED failure (open and short circuit) detection
- Boost section
EDA Symbols, Footprints and 3D Models
The STMicroelectronics team - PM6600
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