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FT838MBD-RB

FT838MBD-RB

  • 厂商:

    FMD(辉芒微)

  • 封装:

    DIP8

  • 描述:

    Converter Offline Flyback Topology 8-DIP

  • 数据手册
  • 价格&库存
FT838MBD-RB 数据手册
Preliminary FT838MBD/838MDD Fremont Micro Devices High Efficiency Off-Line CC/CV Switch DESCRIPTION FEATURES Constant-Current (CC) and The FT838MBD/FT838MDD controller device is Constant-Voltage (CV) with Primary Side optimized for high-performance, low power Control switching mode power supply applications. The Proprietary technology enabling high FT838MBD/FT838MDD efficiency and fast dynamic response charger design by eliminating an opto-coupler No audible noise over entire operating and TL431. Its highly integrated functions such range as Under Voltage Lockout (UVLO), Leading Built-in power MOS Edge Built-in Cable Compensation compensation offer the users a high efficiency Built-in Line Compensation and Primary-side feedback eliminates applications. Blanking low cost (LEB) solution facilitates and for built-in AC/DC CC/CV cable power opto-coupler and TL431 Cycle-by-Cycle Current Limiting Power Over Temperature Protection FT838MBD/FT838MDD can achieve both high VCC Over Voltage Protection average efficiency CV Open-loop Protection and super low standby power. supplies built with fast dynamic load response Excellent capacitive loading start-up Furthermore, FT838MBD/FT838MDD features performance fruitful protections like Open Circuit Protection and Over Temperature Protection to eliminate the external protection circuits and provide TYPICAL APPLICATION reliable operations. FT838MBD/FT838MDD is Adapter/Charger for Cell/Cordless Phones, available in DIP8 package. PDAs, MP3 and Other Portable Apparatus Standby and Auxiliary Power Supplies Set Top Boxes (STB) Adapter for ADSL / WiFi Wireless AC/DC LED Driver applications © 2013 Fremont Micro Devices Inc. Confidential Rev0.80 DS838MBD/MDD-A0-Page1 Fremont Micro Devices Preliminary FT838MBD/838MDD TYPICAL APPLICATION CIRCUIT Figure 1: FT838MBD/838MDD Typical Application Circuit © 2013 Fremont Micro Devices Inc. Confidential Rev0.80 DS838MBD/MDD-A0-Page2 Fremont Micro Devices Preliminary FT838MBD/838MDD ABSOLUTE MAXIMUM RATINGS FB to GND………………………………...…………………………………….…….…….….... -0.3V to +7V CS to GND…………………………………………...…………………………………….…….....-0.3V to +7V VCC to GND…………………………………..………….………………………………………-0.3V to +30V C to GND…………………………………...…………………………….……….…………......-0.3V to +700V 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 exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability. © 2013 Fremont Micro Devices Inc. Confidential Rev0.80 DS838MBD/MDD-A0-Page3 Preliminary FT838MBD/838MDD Fremont Micro Devices PIN CONFIGURATION Figure 2: Pin Assignments TERMINAL DEFINITION Pin Name 1 CS Primary current sense 2 FB Output voltage feedback pin 3 GND Ground. 4 VCC Supply voltage NC No connection 5 6 7 8 D Description The drain of the power MOS. This pin is connected to the primary lead of the transformer Table 1 © 2013 Fremont Micro Devices Inc. Confidential Rev0.80 DS838MBD/MDD-A0-Page4 Preliminary FT838MBD/838MDD Fremont Micro Devices ORDERING INFORMATION FT838MxD x D - xx Circuit Type HSF and Packaging B or D RB: RoHS and Tube RT: RoHS and T&R Cable Comp GB: Green and Tube 0: 0% GT: Green and T&R 1: 3% Package 2: 6% DIP8 3: 9% FT838MBD /FT838MDD Device DESIGNATOR SYMBOL Options 0 Cable Comp = 0% FT838MBD 1 Cable Comp = 3% FT838MDD 2 Cable Comp = 6% 3 Cable Comp = 9% Table 2 MARKING RULE Figure 3: Marking Rule : Represents Version (0, 1, 2 or 3) : for internal reference © 2013 Fremont Micro Devices Inc. Confidential Rev0.80 DS838MBD/MDD-A0-Page5 Fremont Micro Devices Preliminary FT838MBD/838MDD Block Diagram Figure 4: FT838MBD/838MDD Block Diagram © 2013 Fremont Micro Devices Inc. Confidential Rev0.80 DS838MBD/MDD-A0-Page6 Preliminary FT838MBD/838MDD Fremont Micro Devices ELECTRICAL CHARACTERISTICS (For typical values Tj=25 , Vcc=12V, unless otherwise noted) Characteristic Symbol Min Typ Max Unit Vcs_max 535 552 575 mV Tleb 350 400 450 ns 200 ns 2.944 V Current Sense Maximum Current Threshold Leading Edge Blanking Duration Propagation Delay Tpd (OUT=1.0nF to GND) Feedback Section Feedback Voltage Threshold Vfb CCM protection Threshold Level Vcp 2.856 2.9 100 mV Supply Section Start Up Threshold Voltage Vcc_on 15.5 16.2 17.5 V Under Voltage Lockout Voltage Vcc_off 5.2 5.5 6.0 V VCC Start Up Current Istart_up 2 5 uA Operating Current Iop 0.4 0.5 0.7 mA Feedback Loop Open Protection Ifb_open 90 115 140 uA VCC Over Voltage Protection Vcc_OVP 26 27 28 V Over Temperature Protection T_OTP 40 mV Protection Section 145 Compensation Line Compensation (Ifb=1mA) Vline 25 0 Cable 1 compensation 2 33 0 3 Kcab % 6 3 9 Power MOS Section (FT838MBD) Characteristic Static drain-source on-resistance Drain-source breakdown voltage Drain-source leakage current Maximum Drain Current Symbol RDS_ON BVDSS IDSS IDMAX Test condition Min VGS=10V, IDS=250uA 650 Unit V VGS=0V, 10 VDS=650V Vd=4V Max 5.5 IDS=0.5A VGS=0V, Typ 0.6 0.7 uA A Power MOS Section (FT838MDD) Static drain-source on-resistance Drain-source RDS_ON BVDSS © 2013 Fremont Micro Devices Inc. VGS=10V, 2.6 IDS=0.5A VGS=0V, 650 Confidential Rev0.80 V DS838MBD/MDD-A0-Page7 Fremont Micro Devices breakdown voltage Drain-source leakage current Maximum Drain Current Preliminary FT838MBD/838MDD IDS=250uA IDSS IDMAX VGS=0V, 10 VDS=650V Vd=3V 1.0 1.1 uA A Table 3 © 2013 Fremont Micro Devices Inc. Confidential Rev0.80 DS838MBD/MDD-A0-Page8 Fremont Micro Devices Preliminary FT838MBD/838MDD FUNCTIONAL DESCRIPTION Operating Description FT838MBD/FT838MDD is a cost effective and high-performance AC-DC power supply controller for off-line low power AC-DC applications including battery chargers, adaptors and LED lighting. The constant voltage (CV) and constant current (CC) control are achieved accurately without the secondary feedback circuit. Start up Control Start-up current of FT838MBD/838MDD is very low so that a start-up resistor with high resistance and low-wattage is allowed to supply the start-up power for the controller. The large value startup resistor minimizes the power loss in operations and allows quick start up. With a special fast startup technology, FT838MBD/FT838MDD starts up easily in capacitive loading applications. Operating current The operating current of FT838MBD/FT838MDD is as low as 500uA. Good efficiency is achieved with the low operating current. Low operating current also reduces the Vcc hold-up capacitance requirement. Constant voltage (CV) and constant current (CC) Operation The FT838MBD/FT838MDD can accurately achieve CV/CC characteristic output without secondary side voltage and current-feedback circuits. It operates in CV mode to regulate the output voltage by capturing the auxiliary winding feedback voltage at FB pin. The auxiliary winding feedback voltage is proportional to secondary winding, so it provides controller the feedback signal from secondary side and achieves constant-voltage output. In CC mode, the controller detects the secondary discharger peak current and the discharger time, which determines the off-time of the base driver to make the output average current constant. Primary peak current modulation Primary peak current is constant at constant current mode. And primary peak current is modulated at constant voltage mode for the purposes of good dynamic load response and no audible noise over entire operating range. According to the output loading current the current threshold voltage is modulated from 0.55V to 0.27V. The current threshold voltage is 0.55V at rated load and 0.27V at light load. Leading edge blanking Each time the power MOS transistor is switched on, a turn-on spike occurs at the sense resistor. To avoid premature termination of the switching pulse, a 400ns leading edge blanking time is built in. Conventional RC filtering can therefore be omitted. During this blanking period, the current limit comparator is disabling and cannot switch off the base driver. Under voltage lockout (UVLO) FT838MBD/FT838MDD turn-on Vcc_on and turn-off Vcc_off are 16.2 V and 5.5 V, respectively. During start-up, the hold-up capacitor must be charged to 16.2V through the start-up resistor. The hold-up © 2013 Fremont Micro Devices Inc. Confidential Rev0.80 DS838MBD/MDD-A0-Page9 Fremont Micro Devices Preliminary FT838MBD/838MDD capacitor continues to supply Vcc until power can be delivered from the auxiliary winding of the transformer. Vcc must not drop below 5.5 V during this start-up process. This UVLO hysteresis window ensures that hold-up capacitor is sufficient to supply Vcc during start-up. Protection control With rich protection features of FT838MBD/FT838MDD, excellent power supply system reliability can be achieved. The protection features include cycle by cycle current limiting, Vcc over voltage protection and clamp, over temperature protection, feedback loop open circuit protection and Vcc under voltage lockout, etc. Integrated MOS Power MOS is integrated in FT838MBD/FT838MDD for low cost and/or space limited applications, respectively. Output cable compensation The output cable compensation provides a constant output voltage at the end of the cable over the entire load range in constant voltage mode. As the converter load increases from no-load to the peak current load, the voltage drop introduced across the output cable is compensated by increasing the feedback pin reference voltage. © 2013 Fremont Micro Devices Inc. Confidential Rev0.80 DS838MBD/MDD-A0-Page10 Preliminary FT838MBD/838MDD Fremont Micro Devices PACKAGE INFORMATION DIP8 Package Symbol Dimensions In Millimeters Min Max 4.310 Dimensions In Inches Min Max 0.146 0.170 A 3.710 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 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) 0.014 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 Rev0.80 DS838MBD/MDD-A0-Page11 Preliminary FT838MBD/838MDD Fremont Micro Devices Fremont Micro Devices (SZ) Limited #5-8, 10/F, Changhong Building, Ke-Ji Nan 12 Road, Nanshan District, Shenzhen, Guangdong 518057 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 Rev0.80 DS838MBD/MDD-A0-Page12
FT838MBD-RB 价格&库存

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