AS3824A1-ZQFT

AS3824 16-Channel White LED Controller for LCD Backlight 1 Description The AS3824 is a 16 channel high precision LED controller for use in LCD-backlight panels. Dynamic power feedback controls the external power supply to guarantee best efficiency. One high accurate global 10 bit DAC can be used to set the LED current as well as each channel has its own additional 8 bit DAC to boost the dynamic range of LED Backlight systems. Each channel is equipped with an independent PWM generator which can also be synchronized to an external synchronization signal (VSYNC). A fast mode supports minimum PWM duty cycle operation which helps to further reduce the energy consumption of modern LED Backlight systems. The PWM generator clock can be generated internally (DPLL) or an external clock source can be connected to the HSYNC input. Built-in safety features include thermal shutdown as well as open and short LED detection. The device is programmable via serial interface (SPI). 2 Features ●● Global dimming mode option ●● Supports all LED backlight topologies xx AS3824E/E1 are pre-programmed as external PWM mode (DPWM mode), VSYNC pin is used as PWM input. AS3824A/A1 are pre-programmed as SPI mode xx No limit of VLED or ILED, device is not exposed to high voltage/high current ●● Optimum power savings through local dimming xx 16 fully flexible 12 bit PWM generators (period, high time, delay, reverse) ●● One global highly accurate 10 bit DAC which sets the LED current (±0.5% accuracy) ●● High dynamic range boost function xx 16 independent 8 bit DACs can be used to boost/ decrease LED current within certain frames ●● VSYNC and HSYNC inputs, as well as integrated digital PLL for synchronization with TV frame ●● Lowest BOM xx Due to 2 pin concept of the output channel: no HV protection, no cascade FETs ●● Feedback function is compatible to every DC-DC architecture and configurable via SPI ●● Short/OPEN LED detection, temperature shutdown, register lock/unlock, SPI transfer checksum 3 Applications ●● HD TVs ●● UHD TVs ●● LCD Monitors Product Summary www.dialog-semiconductor.com Rev. 1.0 1 of 9 06-Mar-2020 © 2020 Dialog Semiconductor AS3824 16-Channel White LED Controller for LCD Backlight Vin VLED 16 output channels G1 S1 G2 S2 G15 S15 VDD VDD 4.7uF G16 S16 16x precision current sink xFault HSYNC 16x PWM generators DPLL VSYNC SDO SDI SCLK xCS Dynamic power control Dynamic power control Power Supply e.g:DCDC step up/down SPI LDO 2.2uF V3_2 AS3824 VSSA EPAD VSSA DCDC feedback FB1 FB2 VSS_sense Figure 3.1 : AS3824 Typical Application Product Summary www.dialog-semiconductor.com Rev. 1.0 2 of 9 06-Mar-2020 © 2020 Dialog Semiconductor AS3824 16-Channel White LED Controller for LCD Backlight 4 Pinout Description S2 G2 S3 G3 S4 G4 G5 S5 G6 S6 G7 S7 AS3824 48 47 46 45 44 43 42 41 40 39 38 37 G1 1 36 G8 S1 2 35 S8 V3_2 3 34 SDI VSYNC 4 33 SCL HSYNC 5 32 PSE VDD 6 31 SDO FB2 7 30 xCS FB1 8 29 SCMP2 VSSA 9 28 SCMP1 VSS_SENSE 10 27 xFault S16 11 26 S9 G16 12 25 G9 AS3824 TOP VIEW QFN 48 pin 0.5 mm pitch 13 14 15 16 17 18 19 20 21 22 23 24 G15 S14 G14 S13 G13 G12 S12 G11 S11 G10 S10 VSSA S15 49 Figure 4.1 : Pin Diagram of AS3824 (Top View) Pin Number Pin Name Type Pin Description If Not Used 1 G1 A_I/O Connect to gate of external transistor Connect to S1 2 S1 A_I/O Connect to source of external transistor Connect to G1 3 V3_2 P 4 VSYNC DI_PD Vertical sync frequency. PWM generator reset Leave open 5 HSYNC DI_PD Clock input for PWM generators Leave open 6 VDD P 7 FB2 A_I/O Power supply feedback output 2 Leave open 8 FB1 A_I/O Power supply feedback output 1 Leave open 9 VSSA P GND 10 VSS_ SENSE P GND 11 S16 A_I/O Product Summary www.dialog-semiconductor.com Digital supply output. Connect 2.2uF capacitor to GND Supply Voltage input Connect 4.7uF bypass capacitor to GND Connect to source of external transistor Rev. 1.0 3 of 9 Connect to G16 06-Mar-2020 © 2020 Dialog Semiconductor AS3824 16-Channel White LED Controller for LCD Backlight 4 Pinout Description (cont’d) Pin Number Pin Name Type Pin Description If Not Used 12 G16 A_I/O Connect to gate of external transistor Connect to S16 13 S15 A_I/O Connect to source of external transistor Connect to G15 14 G15 A_I/O Connect to gate of external transistor Connect to S15 15 S14 A_I/O Connect to source of external transistor Connect to G14 16 G14 A I/O Connect to gate of external transistor Connect to S14 17 S13 A I/O Connect to source of external transistor Connect to G13 18 G13 A I/O Connect to gate of external transistor Connect to S13 19 G12 A I/O Connect to gate of external transistor Connect to S12 20 S12 A I/O Connect to source of external transistor Connect to G12 21 G11 A I/O Connect to gate of external transistor Connect to S11 22 S11 A I/O Connect to source of external transistor Connect to G11 23 G10 A I/O Connect to gate of external transistor Connect to S10 24 S10 A I/O Connect to source of external transistor Connect to G10 25 G9 A I/O Connect to gate of external transistor Connect to S9 26 S9 A I/O Connect to source of external transistor Connect to G9 27 xFAULT DO_OD Open drain fault output, connect pull-up to V3_2 Leave open 28 SCMP1 AI Input of short comparator 1 Connect to VSS 29 SCMP2 AI Input of short comparators 2 Connect to VSS 30 xCS DI_PU SPI interface chip select Leave open 31 SDO DO SPI interface data output. Tristate output Leave open 32 PSE DI Phase Shift enable Connect to VSS 33 SCL DI_PD SPI interface clock Leave open 34 SDI DI_PD SPI interface data input Leave open 35 S8 A I/O Connect to source of external transistor Connect to G8 36 G8 A I/O Connect to gate of external transistor Connect to S8 37 S7 A I/O Connect to source of external transistor Connect to G7 38 G7 A I/O Connect to gate of external transistor Connect to S7 39 S6 A I/O Connect to source of external transistor Connect to G6 40 G6 A I/O Connect to gate of external transistor Connect to S6 Product Summary www.dialog-semiconductor.com Rev. 1.0 4 of 9 06-Mar-2020 © 2020 Dialog Semiconductor AS3824 16-Channel White LED Controller for LCD Backlight 4 Pinout Description (cont’d) Pin Number Pin Name Type Pin Description If Not Used 41 S5 A I/O Connect to source of external transistor Connect to G5 42 G5 A I/O Connect to gate of external transistor Connect to S5 43 G4 A I/O Connect to gate of external transistor Connect to S4 44 S4 A I/O Connect to source of external transistor Connect to G4 45 G3 A I/O Connect to gate of external transistor Connect to S3 46 S3 A I/O Connect to source of external transistor Connect to G3 47 G2 A I/O Connect to gate of external transistor Connect to S2 48 S2 A I/O Connect to source of external transistor Connect to G2 EP VSSA P Note 1. Exposed PAD. Connect to VSSP If an output channel “X” is not used, connect unused pins Gx and Sx together. A_I/O: Analog pin P: Power pin DO: Digital Output DO_OD: Digital Output Open Drain DI: Digital Input DI_PU: Digital Input with Pull Up resistor DI_PD: Digital Input with Pull Down resistor Product Summary www.dialog-semiconductor.com Rev. 1.0 5 of 9 06-Mar-2020 © 2020 Dialog Semiconductor AS3824 16-Channel White LED Controller for LCD Backlight 5 Absolute Maximum Ratings Absolute maximum ratings are the parameter values or ranges which can cause permanent damage if exceeded. For maximum safe operating conditions, refer to the Electrical Characteristics section. Parameter Symbol Conditions Min Max Unit VDDMAX / VGND Applicable for pin VDD -0.3 7 V Maximum Voltage Analog pins VANAMAX Applicable for pins: FB1, FB2, G1G16, S1-S16, VSYNC, HSYNC -0.3 7 V Maximum Voltage Digital pins VDIGMAX Applicable for pins: V3_2, SDI, SDO, SCL, xCS, SCMP1, SCMP2, xFAULT, PSE -0.3 5 V ISCR JEDEC JESD78D Nov 2011 ±100 mA Electrostatic Discharge HBM ESDHBM JS-001-2012 ±2000 V Electrostatic Discharge CDM ESDCDM JEDEC JESD22-C101F Oct 2013 ±500 V Electrostatic Discharge MM ESDMM JESD22-A115C ±200 V Electrical Parameters Supply Voltage to Ground Input Current (latch-up immunity) Electrostatic Discharge Temperature Ranges and Storage Conditions Junction to Ambient Thermal Resistance Operating Junction Temperature Storage Temperature Range RTHJA RTHJA typical 35°C/W °C/W TJ -20 115 °C TSTRG -55 150 °C 260 °C 85 % Package Body Temperature TBODY Relative Humidity (non-condensing) RHNC Moisture Sensitivity Level MSL IPC/JEDEC J-STD-020 The reflow peak soldering temperature (body temperature) is specified according to IPC/JEDEC J-STD-020 “Moisture/Reflow Sensitivity Classification for Non-hermetic Solid State Surface Mount Devices.” The lead finish for Pb-free leaded packages is “Matte Tin” (100% Sn) 5 Maximum floor life time of 168h 3 Note 1. Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, so functional operation of the device at these or any other conditions beyond those indicated in the Electrical Characteristics of the specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Product Summary www.dialog-semiconductor.com Rev. 1.0 6 of 9 06-Mar-2020 © 2020 Dialog Semiconductor AS3824 16-Channel White LED Controller for LCD Backlight 6 Physical Dimensions Figure 6.1 : QFN-48 package outline drawing Product Summary www.dialog-semiconductor.com Rev. 1.0 7 of 9 06-Mar-2020 © 2020 Dialog Semiconductor AS3824 16-Channel White LED Controller for LCD Backlight 7 Ordering Information Note 1. Part Number Ordering Code Package Description AS3824A1 AS3824A1-ZQFT 48-Pin QFN Tape & Reel1 AS3824E1 AS3824E1-ZQFT 48-Pin QFN Tape & Reel1 Tape & Reel packing quantity is 4,000/reel. Minimum packing quantity is 4,000. Product Summary www.dialog-semiconductor.com Rev. 1.0 8 of 9 06-Mar-2020 © 2020 Dialog Semiconductor AS3824 16-Channel White LED Controller for LCD Backlight Disclaimer Unless otherwise agreed in writing, the Dialog Semiconductor products (and any associated software) referred to in this document are not designed, authorized or warranted to be suitable for use in life support, life-critical or safety-critical systems or equipment, nor in applications where failure or malfunction of a Dialog Semiconductor product (or associated software) can reasonably be expected to result in personal injury, death or severe property or environmental damage. Dialog Semiconductor and its suppliers accept no liability for inclusion and/or use of Dialog Semiconductor products (and any associated software) in such equipment or applications and therefore such inclusion and/or use is at the customer’s own risk. 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Phone: +31 73 640 8822 Taiwan Dialog Semiconductor Taiwan Phone: +886 281 786 222 Email info_pcbg@diasemi.com Web site: www.dialog-semiconductor.com Product Summary www.dialog-semiconductor.com Rev. 1.0 9 of 9 06-Mar-2020 © 2020 Dialog Semiconductor