LED7707TR STMicroelectronics

LED7707 6-rows 85 mA LEDs driver with boost regulator for LCD panels backlight Datasheet - production data Applications LCD monitors and TV panels PDAs panel backlight GPS panel backlight Description VFQFPN-24 4x4 The LED7707 consists of a high efficiency Features monolithic boost converter and six controlled current generators (rows) specifically designed to Boost section supply LED arrays used in the backlighting of 4.5 V to 36 V input voltage range LCD panels. The device can manage an output Internal power MOSFET voltage up to 36 V (i.e. 10 white LEDs per row). Internal +5 V LDO for device supply The generators can be externally programmed to Up to 36 V output voltage sink up to 85 mA and can be dimmed via a PWM Constant frequency peak current-mode signal (1% dimming duty-cycle at 1 kHz can be control managed). The device can detect and manage open circuit and short-circuit LED faults and leave 250 kHz to 1 MHz adjustable switching unused rows floating. Basic protections (output frequency overvoltage, internal MOSFET overcurrent and External synchronization for multi-device thermal shutdown) are provided. 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 85 mA maximum current capability (adjustable) Rows disable option Less than 10 s minimum dimming on-time 2% current matching between rows LED failure (open and short-circuit) detection Table 1. Device summary Order code Package Packing LED7707 Tube VFQFPN-24 4x4 (exposed pad) LED7707TR Tape and reel OOccttobeober 20r 201818 DDooccIIDD1144442288 R Reevv 5 5 11/48/48 ThThiiss i iss i innforformmatatiion oon onn a a pr prododuct iuct inn fu fullll proproducductition.on. www.st.comContConteennttss LLEED7D7707707 Contents 1 Typical application circuit 6 2 Pin settings 7 2.1 Connections 7 2.2 Pin description 7 3 Electrical data 9 3.1 Maximum ratings 9 3.2 Thermal data . 9 4 Electrical characteristics 10 5 Operation description . 12 5.1 Boost section 13 5.1.1 Functional description 13 5.1.2 Enable function . 14 5.1.3 Soft-start 15 5.1.4 Overvoltage protection 16 5.1.5 Switching frequency selection and synchronization . 16 5.1.6 Slope compensation . 18 5.1.7 Boost current limit . 19 5.1.8 Thermal protection . 20 5.2 Backlight driver section 21 5.2.1 Current generators . 21 5.2.2 PWM dimming 23 5.3 Fault management 23 5.3.1 FAULT pin . 23 5.3.2 MODE pin . 24 5.3.3 Open LED fault . 24 5.3.4 Shorted LED fault . 25 6 Application information . 27 6.1 System stability 27 6.1.1 Loop compensation 27 2/2/4488 DDoocIcIDD1144442828 R Reev 5v 5