FT883A-RT

Preliminary FT883x Fremont Micro Devices High Performance Non-isolated Buck-Boost LED Driver DESCRIPTION FEATURES No Auxiliary winding for sensing and supplying FT883x is optimized for low cost non-isolated True Buck-Boost Technology for high output Buck-Boost switching mode LED driver applications. voltage under universal input voltage With Constant current control without secondary demagnetization sensing technology and the ultra source driving architecture, special sense and feedback circuit low operating current, FT883x doesn’t need the Built-in 550V Power MOSFET auxiliary winding for output current sensing and chip ±3% LED current accuracy power supplying. This allows FT883x to use Ultra low operating current to improve inductors in stead of multiple-winding transformers efficiency that are typically used with other isolated LED Applications up to 18W output drivers. FT883x also integrates a 550V power Built-in line compensation MOSFET that further improves the system reliability Cycle-by-Cycle current limiting and lowers the system cost and complexity. Precision OVP voltage for best LED open FT883x’s True Buck-Boost technology allows the circuit protection system to output 120V under universal AC input with LED short circuit protection minimum bulk cap of 4.7uF or up to 150V output Over temperature compensation under high input voltage condition. CS resistor short circuit protection. VCC under-voltage lockout Its highly integrated functions such as Leading Edge Available in SOP8 and DIP8 packages Blanking (LEB) and built-in line compensation offer users a high efficiency and low cost solution for constant current LED driver applications. APPLICATIONS Furthermore, FT883x offers fruitful protections like LED open and short circuit protection, over DC/DC or AC/DC LED Driver Applications temperature compensation, CS resistor short circuit Back Lighting of Flat Panel Displays protection. The industry leading OVP voltage accuracy ensures the best LED open circuit protection. © 2013 Fremont Micro Devices Inc. Confidential Rev0.8 DS883x-A0-page1 Preliminary FT883x Fremont Micro Devices TYPICAL APPLICATION CIRCUIT AC INPUT + Vo + Vo + + VCC DRAIN TP DRAIN FT883x NC NC CS GND Figure 1: Typical Application Circuit ABSOLUTE MAXIMUM RATINGS CS to GND…………………………………………...……………………………………….……..-0.3V to +7V VCC to GND…………………………………..………….………………………………………-0.3V to +20V DRAIN to GND…………………………………...…………………………….……….………-0.3V to +550V TP to GND………………………………...…………………………………….………….….…………. -0.3V to +20V Operating Temperature Range……………………...………………………………………..-40 to +125 Junction Temperature………………………………..……………………………………….. -40 to +150 Storage Temperature Range ……………………………..……………………………….….-60 to +150 ESD Protection HBM……………….....………………………………………………………………….2000V ESD Protection MM………………..……………………………………………………………………………….200V * Stresses exceed those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. Functional operation of the device at conditions beyond those listed in the specification is not guaranteed. Prolonged exposure to extreme conditions may affect device reliability or functionality. © 2013 Fremont Micro Devices Inc. Confidential Rev0.8 DS883x-A0-page2 Preliminary FT883x Fremont Micro Devices PIN CONFIGURATION Top View CS 1 8 NC GND 2 7 NC 3 6 DRAIN TP 4 5 DRAIN VCC Figure 2: Pin Assignments TERMINAL DESCRIPTION No. PIN FUNCTION Current sense. This pin connects a current sense resistor to GND 1 CS 2 GND Ground 3 VCC Power supply 4 TP 5,6 DRAIN 7,8 NC Test point Internal high voltage MOSFET Drain No connection, must be floating Table1 ORDERING INFORMATION FT883 x – x x x HSF and Packaging Circuit Type RB: RoHS and Tube Internal MOS Type RT: RoHS and T&R A, B, BD, C or CD GB: Green and Tube GT: Green and T&R Package Blank: SOP8 D: DIP8 © 2013 Fremont Micro Devices Inc. Confidential Rev0.8 DS883x-A0-page3 Preliminary FT883x Fremont Micro Devices Internal MOS Package Type Maximum Maximum Output Output Power Current Maximum Output Voltage 90V-265V HSF SOP8 5W Ordering Code 170V-265V Tube FT883A-RB T&R FT883A-RT Tube FT883A-GB T&R FT883A-GT Tube FT883B-RB T&R FT883B-RT Tube FT883B-GB T&R FT883B-GT RoHS Tube FT883BD-RB Green Tube FT883BD-GB Tube FT883C-RB T&R FT883C-RT Tube FT883C-GB T&R FT883C-GT RoHS Tube FT883CD-DRB Green Tube FT883CD-DGB RoHS A Packaging 35mA Green RoHS B SOP8 7W 60mA Green 120V BD DIP8 9W 150V 80mA RoHS C SOP8 12W 100mA Green CD DIP8 18W 130mA © 2013 Fremont Micro Devices Inc. Confidential Rev0.8 DS883x-A0-page4 Preliminary FT883x Fremont Micro Devices MARKING RULE Figure 3 marking rule for internal reference BLOCK DIAGRAM DRAIN VCC 3 + 15V VOLTAGE REGULATOR UVLO - 5,6 Internal reference & bias VCC 12.8V/ 9V OVP OCP OTP Constant Current & Logic Control 4 TP 1 CS LEB GND 2 + Current Sense 0.5V Figure 4 Block Diagram © 2013 Fremont Micro Devices Inc. Confidential Rev0.8 DS883x-A0-page5 Preliminary FT883x Fremont Micro Devices ELECTRICAL CHARACTERISTICS (Tj = 25°C, VCC = 14V, unless otherwise specified) Symbol Parameter Test Condition Min Typ Max Unit SUPPLY VOLTAGE VCCon Turn-on threshold 12.8 V VCCoff Turn-off threshold 9 V VCCclamp VCC clamp voltage 15.4 V 26 uA 110 uA SUPPLY CURRENT Before turn-on, Istart-up Start-up current Iq Quiescent Current VCC= VCCon -1V CURRENT SENSE VCS_TH TLEB TDELAY Threshold voltage for 485 peak current limit Leading edge blanking time for current sense Switch off delay time 500 515 mV 500 ns 200 ns SWITCH FREQUENCY FMIN Minimum LED FOVP working 5 frequency open protection KHz circuit switching 68 KHz 33 % frequency MAXIMUM DUTY CYCLE D TDIS/T duty cycle MOSFET (FT883A) RDS_ON BVDSS IDSS IDMAX Static drain-source on-resistance Drain-source breakdown voltage Drain-source leakage current Maximum Drain Current VGS=10V,IDS=0.5A VGS=0V,IDS=250uA 12 550 V VGS=0V,VDS=550V 10 Vd=6V 0.46 VGS=10V,IDS=0.5A 8 uA A MOSFET (FT883B and FT883BD) RDS_ON BVDSS IDSS Static drain-source on-resistance Drain-source breakdown voltage Drain-source leakage current © 2013 Fremont Micro Devices Inc. VGS=0V,IDS=250uA 550 VGS=0V,VDS=550V Confidential Rev0.8 V 10 uA DS883x-A0-page6 Preliminary FT883x Fremont Micro Devices IDMAX Maximum Drain Current Vd=6V 0.66 VGS=10V,IDS=0.5A 5 A MOSFET (FT883C and FT883CD) RDS_ON BVDSS IDSS IDMAX Static drain-source on-resistance Drain-source breakdown voltage Drain-source leakage current Maximum Drain Current VGS=0V,IDS=250uA 550 V VGS=0V,VDS=550V Vd=6V 10 0.9 uA A Over Temperature Compensation TSD TSD_HYS Thermal compensation 150 threshold Thermal compensation 25 hysteresis Table2 © 2013 Fremont Micro Devices Inc. Confidential Rev0.8 DS883x-A0-page7 Preliminary FT883x Fremont Micro Devices FUNCTIONAL DESCRIPTION Operating Description FT883x is a cost effective and high-performance non-isolated True Buck-Boost LED driver. The constant current (CC) control is achieved accurately without the secondary feedback circuit and auxiliary winding. The True Buck-Boost technology allows up to 150V output under universal input voltage. Startup Control The start-up current in FT883x is designed to be as low as 20uA. The VCC capacitor will be charged through a start-up resistor when the system is powered on. Once the VCC voltage reaches the start-up threshold, FT883x will start to switch . The VCC voltage of FT883x is clamped at 15V. Due to the ultra-low operating current, the auxiliary winding is not needed to supply the IC, good efficiency is achieved. Constant Current Control Cycle-by-Cycle current sense is adopted in FT883x, and the voltage on CS will be compared with the internal 500mV reference voltage through the current sense comparator, the MOSFET will be switched off when the voltage on CS reaches the threshold. The primary peak current is given by: I P _ PK 500 (mA) Rcs The current in LED can be calculated by the equation: I OUT I P _ PK 2 * Tdis T Where, IP_PK is the peak current in MOSFET, Tdis/T is the ratio of discharge time and operation period. Leading Edge Blanking (LEB) Each time the power transistor is switched on, a turn-on spike occurs at the sense resistor. To avoid premature termination of the switching pulse, a 500ns leading edge blanking time is built in. Conventional RC filtering can therefore be omitted. During this blanking period, the current limit comparator is disabled and can not switch off the gate driver. Over Voltage Protection (OVP) FT883x features the industry leading output OVP accuracy by means of limiting the maximum system operating frequency to 68KHz. The system normal operating frequency is recommended to be around 52KHz. Output LED open circuit will trigger the over-voltage protection logic and latch, the system stops switching immediately. VCC will be pulled down and charged up again, the system works in a hiccup mode. LED Short Circuit Protection When LED short circuit is detected, the system works at minimum frequency (Fop=5KHz), so the power consumption is low. CS Resistor Short or Inductor Saturation If these catastrophic fault conditions happen, the internal fast fault detection circuit will trigger and latch, the system stops switching immediately, the system VCC will be pulled down and charged up again, system © 2013 Fremont Micro Devices Inc. Confidential Rev0.8 DS883x-A0-page8 Preliminary FT883x Fremont Micro Devices working in a hiccup mode. Over Temperature Compensation FT883x senses the die temperature after start up, and the thermal compensation threshold is set to 150 with a 25 hysteresis. When FT883x temperature rises and reaches the threshold, the output current will be reduced by half until the IC temperature falls 25 below the thermal compensation trigger point, at which point the output current will recover to 100% of its designed target. © 2013 Fremont Micro Devices Inc. Confidential Rev0.8 DS883x-A0-page9 Preliminary FT883x Fremont Micro Devices SOP8 PACKAGE OUTLINE DIMENSIONS Symbol Dimensions In Millimeters Dimensions In Inches Min Max Min Max A 1.350 1.750 0.053 0.069 A1 0.100 0.250 0.004 0.010 A2 1.350 1.550 0.053 0.061 b 0.330 0.510 0.013 0.020 c 0.170 0.250 0.006 0.010 D 4.700 5.100 0.185 0.200 E 3.800 4.000 0.150 0.157 E1 5.800 6.200 0.228 0.244 e L 1.270 (BSC) 0.050 (BSC) 0.400 1.270 0.016 0.050 0° 8° 0° 8° © 2013 Fremont Micro Devices Inc. Confidential Rev0.8 DS883x-A0-page10 Preliminary FT883x Fremont Micro Devices DIP8 PACKAGE OUTLINE DIMENSIONS Symbol Dimensions In Millimeters Dimensions In Inches Min Max Min Max A 3.710 4.310 0.146 0.170 A1 0.510 A2 3.200 3.600 0.126 0.142 B 0.380 0.570 0.015 0.022 B1 0.020 1.524 BSC 0.060 BSC C 0.204 0.360 0.008 0.014 D 9.000 9.400 0.354 0.370 E 6.200 6.600 0.244 0.260 E1 7.320 7.920 0.288 0.312 e 2.540 (BSC) 0.100 BSC L 3.000 3.600 0.118 0.142 E2 8.400 9.000 0.331 0.354 © 2013 Fremont Micro Devices Inc. Confidential Rev0.8 DS883x-A0-page11 Preliminary FT883x Fremont Micro Devices Fremont Micro Devices (SZ) Limited #5-8, 10/F, Changhong Building, Ke-Ji Nan 12 Road, Nanshan District, Shenzhen Tel: (86 755) 86117811 Fax: (86 755) 86117810 Fremont Micro Devices (Hong Kong) Limited #16, 16/F, Blk B, Veristrong Industrial Centre, 34-36 Au Pui Wan Street, Fotan, Shatin, Hong Kong Tel: (852) 27811186 Fax: (852) 27811144 Fremont Micro Devices (USA), Inc. 42982 Osgood Road Fremont, CA 94539 Tel: (1-510) 668-1321 Fax: (1-510) 226-9918 Web Site: http://www.fremontmicro.com/ * Information furnished is believed to be accurate and reliable. However, Fremont Micro Devices, Incorporated (BVI) assumes no responsibility for the consequences of use of such information or for any infringement of patents of other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent rights of Fremont Micro Devices, Incorporated (BVI). Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. Fremont Micro Devices, Incorporated (BVI) products are not authorized for use as critical components in life support devices or systems without express written approval of Fremont Micro Devices, Incorporated (BVI). The FMD logo is a registered trademark of Fremont Micro Devices, Incorporated (BVI). All other names are the property of their respective owners. © 2013 Fremont Micro Devices Inc. Confidential Rev0.8 DS883x-A0-page12