BD555BKFV Datasheet BD555BKFV AC/DC Controller IC for mains dimmable LED lighting BD555BKFV ●General Description The BD555BKFV controller AC/DC controller IC can be used in a wide range of dimmable LED lighting driver applications. The main target application is dimmable retro-fit LED lighting, replacing existing incandescent light bulbs, halogen spot lights, CFL tubes etc. ●Features Fixed frequency DC/DC controller (selectable) Peak current or average current control (PCC/ACC) Dynamic Load Current Controller (DLCC) Logarithmic compensation of detected dimming level Dimmer detector function Anti-flash function when dimmer is OFF PWM and analog dimming control supported Over Current Protection (OCP) Thermal Shutdown protection (TSD) Under Voltage Lock Out (UVLO) ●Key Specifications Input voltage range........................................16~39V Regulated supply voltage.................................11.5V Fixed DC/DC operating frequency.........40~400kHz Detectable phase-cut range........................45°~135° Typical current consumption.............................1mA Under Voltage Lock Out detection.....................9.0V Operating temperature range.................-40~+110°C ●Package SSOP-B14 W(Typ.) x D(Typ.) x H(Max.) 5.00mm x 6.40mm x 1.15mm ●Applications Retro-fit dimmable LED lighting (E27, E14, GU10, T8 etc.). Wide range of TRIAC and transistor dimmers supported by DLCC function. Custom LED lighting with PWM or voltage controlled dimming. ●Typical Application Circuits Figure 1. Typical application circuit for non-isolated dimmable buck topology ○Product structure： ：Silicon monolithic integrated circuit ○This product is not designed protection against radioactive rays .www.rohm.com TSZ02201-0W1W0C300010-1-2 © 2012 ROHM Co., Ltd. All rights reserved. 1/10 TSZ22111・ ・ 14・ ・001 03.Aug.2012 Rev.001 Datasheet BD555BKFV ●Pin Configuration Figure 2. Pin configuration Figure 3. Equivalent circuit ●Pin Description Pin Pin name Function 1 BLDR Driver for dynamic load current controller (DLCC) transistor 2 WBLD Internal strong load current input (connected to internal ‘open drain’ NMOS) 3 ISYS *1 4 GND Ground terminal 5 DIM Detected dimming level reference voltage 6 DET 7 8 REF Sense voltage input for DLCC ON/OFF function Input for detecting phase-cut angle *2 Pin for external resistor to set LED current (average current control mode) *2 Pin for external resistor to set DC/DC operating frequency OSC *3 9 FB 10 ISNS Average current feedback input or PCC mode selection (VFB <1.5V) Sense voltage for peak current regulation & over current protection (OCP) *4 11 PGND Ground terminal for internal BLDR and SW driver stages 12 SW Driver output for gate of external DC/DC switching MOSFET 13 VDDH Regulated supply voltage SUP Input supply voltage 14 *1 *2 *3 *4 Between ISYS and GND are internal anti-parallel surge diodes Connect only resistive load according to application instructions FB terminal is ‘pre-charged’ to 4V during start-up in order to have smooth start of the LED current regulation. Never connect this pin directly to GND. Between GND and PGND are internal anti-parallel diodes www.rohm.com © 2012 ROHM Co., Ltd. All rights reserved. TSZ22111・ ・ 15・ ・001 2/10 TSZ02201-0W1W0C300010-1-2 03.Aug.2012 Rev.001 Datasheet BD555BKFV ●Block Diagram Figure 4. Block diagram of BD555BKFV functions ●Description of Blocks Startup sequence: when an AC input voltage is applied, the rectified mains voltage (VHV) is buffered by capacitor C2 and starts supplying the BD555BKFV via start-up resistor R6. The VDDH capacitor C5 will be charged by the internal regulator until the system UVLO condition is released, after which a PWM signal from terminal SW can start driving the external NMOS when the anti-flash detector is released. Anti-flash detector: Some dimmers require a small leakage current to power an internal electronic control circuit or an indicator LED. In order to prevent a ‘false start’ when the VHV buffer cap was accidentally charged by this leakage current, the detection level voltage on the DIM terminal needs to rise above 400mV, before the SW terminal starts switching, lighting up the LEDs. DC/DC buck converter: when the SW signal is high, it turns ON the MN2 MOSFET, building up a current in coil L1 via the LED string. During the OFF period of MN2, the current flows via fly-back diode D4. Capacitor C4 stabilizes the LED voltage to reduce the LED current ripple. The LED current is regulated by controlling the LED forward voltage. Auxiliary supply voltage: The alternating current in the primary side of inductor L1 is coupled np:ns to the secondary side, creating a voltage alternating between VVHV (MN2=ON) and (VLED + Vth,D4)* ns/np (MN2=OFF). This last voltage is passed on to capacitor C3 via diode D5. This creates an auxiliary supply which improves efficiency by reducing the resistive power loss in the start-up resistor R6. LED average current control (ACC) mode: The BD555BKFV features two feedback mechanisms by average current control (ACC) or peak current control (PCC). In ACC mode, the high-side sensing resistor R7 is used in the LED current mirror (typically 1:500), creating an LED feedback current in transistor Q1. This current flows to the FB terminal and creating a reference voltage (for LED current regulation) across resistor R12 at the REF terminal. www.rohm.com © 2012 ROHM Co., Ltd. All rights reserved. TSZ22111・ ・ 15・ ・001 3/10 TSZ02201-0W1W0C300010-1-2 03.Aug.2012 Rev.001 Datasheet BD555BKFV LED peak current control (PCC) mode: Alternatively, in PCC mode (VFB <1.5V), the duty-cycle of the SW signal is determined by the ‘peak current’ through resistor R10. The ISNS terminal senses the voltage across resistor R10. When this voltage reaches the reference voltage, the SW signal will be pulled low. During startup and in ACC mode, this function is used as ‘Over Current Protection’ to limit the current through inductor L1. In both ACC and PCC mode, the REF voltage will be adjusted to the detected phase-cut in case a dimmer is connected. Phase-cut detection: via resistive divider R4/R5 at the DET terminal, the rising and falling edge of the phase-cut are detected, generating an internal PWM signal. Via an internal resistor and external capacitor C1, this PWM signal is averaged into a dimming reference voltage at the DIM terminal. An internal conversion function creates a logarithmically corrected voltage at the REF terminal. This allows achieving a ‘natural’ LED light intensity curve as perceived by the human eye, when turning the dimmer knob. Dimmer stability: based on the phase-cut detection at the DET terminal, the DLCC dynamically adjusts the total load current for stable operation of ‘leading edge’ TRIAC dimmers. For ‘trailing edge’ dimmers, the DLCC load current pulls down the dimmer output voltage, in order to detect the falling edge. In case the VHV current exceeds the minimum load current requirement, the DLCC load current can disabled completely. This allows to achieve high efficiency without dimmers. Dimmer detector: when a dimmer is not present, the DLCC will be switched OFF. www.rohm.com © 2012 ROHM Co., Ltd. All rights reserved. TSZ22111・ ・ 15・ ・001 4/10 TSZ02201-0W1W0C300010-1-2 03.Aug.2012 Rev.001 Datasheet BD555BKFV ●Absolute Maximum Ratings Parameter Symbol Maximum rating Unit Supply voltage (SUP terminal) VSUP 40 V Internal supply regulator voltage (VDDH terminal) VVDDH 15.5 V SW output current ISW BLDR output current 600 IBLDR WLBD, ISNS terminal voltage 60 VWBLD, VISNS *1 mA *1 mA 15.5 V *2 WBLD input current (strong load current) ISBLD DIM, DET, OSC, REF, FB terminal voltage VDIM, VDET, VOSC, VREF, VFB 4.5 V IFB 4.0 mA VISYS, VPGND +/- 0.5 V foperating 400 kHz FB input current (VFB=4.5V) ISYS, PGND terminal voltage Operating frequency 300 *4 Maximum power dissipation Pd Operating ambient temperature range Ta -40 ～ +110 °C Tstorage -55 ～ +150 °C Tjunction,max +150 °C Storage temperature range Maximum junction temperature *1 *2 *3 *4 0.87 mA W ISW pulse current duration <100ns@foperating IBLDR pulse current duration <1us@fmains never exceed 0.8*Pd IWBLD pulse current duration <300us@fmains SSOP-B14 package thermal resistance RθJA=143°C/W, mounted on a two-layer PCB of 70x70x1.6mm 3 ●Recommended Operating Range (Ta= -40 ~ +110°C) Parameter Supply voltage Symbol Range Unit VSUP 16 ~ 39 V ●Electrical Characteristics Parameter Symbol Limits Min. Typ. Max. Unit Comments 1 Internal Supply Regulator* Startup current ISUP,start - 0.4 0.8 mA In UVLO condition Supply current ON ISUP,NS - 0.8 1.0 mA No switching. Supply current ON 1 ISUP,ON1 - 1.0 1.3 mA No load on SW/BLDR, fSW =40KHz. Supply current ON 2 ISUP,ON2 - 2 2.4 mA No load on SW/BLDR, fSW =400KHz. VDDH internal regulator voltage VVDDH 10.0 11.5 15.0 V VDDH load current IVDDH < 10mA UVLO release voltage VUVLO,rl 9.20 10.0 10.8 V VDDH rising UVLO trigger voltage VUVLO,tr V VDDH falling UVLO hysteresis VUVLO,tr - VUVLO,hys VUVLO,hys 0.75 1.00 1.25 V Minimum frequency fSW_min 32 40 48 kHz Maximum frequency fSW_max 320 400 480 kHz δmax 70 75 80 % tON,min - 80 140 ns Switching regulator SW maximum duty cycle SW minimum ON-time www.rohm.com © 2012 ROHM Co., Ltd. All rights reserved. TSZ22111・ ・ 15・ ・001 5/10 6 ±20% fSW = 9.0×10 /R11 (kHz) , for frequency range 40KHz to 400KHz. Determines minimum duty-cycle TSZ02201-0W1W0C300010-1-2 03.Aug.2012 Rev.001 Datasheet BD555BKFV Parameter Symbol Limits Min. Typ. Max. Comments Unit SW slew rate tSW,slew - 50 100 ns VSW = 1…11V at 1nF load (rising/falling) SW driver ON resistance (PMOS) RSW,P - 15 40 Ω VSW=0V, ISW=-10mA SW driver OFF resistance (NMOS) RSW,N - 15 40 Ω VSW= VDDH, ISW=10mA Duty cycle, FB=3.5V δ20 2 20 38 % Duty cycle, FB=2.9V δ60 36 60 80 % VFB,mode 1.4 1.6 1.9 V PCC (VFB<1.4V), ACC (VFB>1.9V) ISNS trigger voltage (OCP) VOCP 1.08 1.20 1.36 V Inductor current limiter in ACC mode ISNS blanking time (OCP) tOCP,blank 90 140 180 ns Used in PCC & ACC mode DET phase cut voltage (rising) VDET,r 215 260 300 mV DET phase cut voltage (falling) VDET,f 75 110 190 mV DET phase cut hysteresis VDET,hys 75 130 180 mV DIM voltage (no dimming) VDIM1 2.85 3.0 3.15 V Phase-cut = 135° DIM voltage (max dimming) VDIM2 0.95 1.0 1.05 V Phase-cut = 45° REF voltage (no dimming) ACC VREF,A1 1.85 2.0 2.15 V REF voltage (max dimming) ACC VREF,A2 75 100 135 mV ACC mode (VFB>1.9), 2kΩ < RREF < 10kΩ ISNS voltage (no dimming) PCC VISNS,P1 1.12 1.24 1.36 V ISNS voltage (max dimming) PCC VISNS,P2 200 260 316 mV PCC mode (VFB < 1.5V). VISNS peak current threshold, RREF=2kΩ BLDR driver slew rate tBLDR,slew - 1 5 µs VSW = 1…11V at 1nF load (rising/falling) BLDR driver ON resistance RBLDR,P - 100 300 Ω VBLDR=0V, IBLDR=-10mA BLDR driver OFF resistance RBLDR,N - 100 300 Ω VBLDR= VDDH, IBLDR=10mA Strong load current ISBLD,sat 200 250 - mA Strong load current ON (VISYS<100mV, VDIM<3.4V, VVDDH=11.5V, VWBLD-VISYS=8V) Strong load internal NMOS RON RON,SBLD - 10 300 Ω Strong load current ON (VISYS<100mV, VDIM<3.4V, VVDDH=11.5V, VWBLD-VISYS=8V) Strong load current OFF delay tSB,OFF 180 250 320 µs After phase-cut rising edge Dimmer detector trigger voltage VDIM,tr 3.3 3.5 3.7 V DLCC load current OFF Dimmer detector release voltage VDIM,rl V DLCC load current ON FB mode selection threshold ACC mode Dimmer phase-cut detector Monitored at output bridge rectifier Dynamic Load Current Controller Dimmer detector hysteresis VDIM,tr-VDIM,hys VDIM,hys 50 100 170 mV ISYS load current OFF voltage VISYS,OFF -260 -200 -160 mV DLCC load current OFF ISYS load current ON voltage VISYS,ON VISYS,OFF+VISYS,hys mV DLCC load current ON ISYS current sense hysteresis VISYS,hys 75 100 140 mV Anti-flash detector threshold VDIM,start 360 400 440 mV DC/DC starts switching (VDIM >400mV) *1 The supply regulator has a thermal shutdown function that triggers at about 175°C, having a hystere sis of about 20°C. This protects against a too high junction-temperature (e.g. due to ‘short’ currents of VDDH, SW or BLDR to (P)GND on the PCB or excessive ambient temperatures). www.rohm.com © 2012 ROHM Co., Ltd. All rights reserved. TSZ22111・ ・ 15・ ・001 6/10 TSZ02201-0W1W0C300010-1-2 03.Aug.2012 Rev.001 Datasheet BD555BKFV ●Application Examples The BD555BKFV is typically used as a controller IC in retro-fit dimmable LED lighting systems. The external component selection is fully dependent on the type of LED driver. For more information about this, please refer to the BD555BKFV application note. The example circuit below shows a dimmable non-isolated buck converter. A non-isolated topology is suitable for relatively low LED power (e.g. VLED=100V and ILED=40mA) applications in which the LED heatsink is electrically isolated by a non-conductive LED lamp casing. Figure 5. Final application circuit for non-isolated dimmable ACC LED driver ●Notes of board layout There are a few considerations for designing a small-sized PCB that fits inside a LED lamp casing. Special attention needs to be given to component placement for optimal grounding and minimum distances of high-voltage wiring. 1) 2) 3) 4) OCP sense resistor ROCP and snubber resistor Rs need to be connected as close as possible to the minus terminal of the VHV buffer capacitor. The drain terminal of switching NMOS MN2 should be close to the inductor L1p and fly-back diode D4. The GND and PGND terminals need to be connected directly on the PCB. For mains-isolated designs (not described in this document), the isolated PCB terminals need to be separated from the 'hot' side electronics. ●Selection of Components Externally Connected Please refer to the BD555BKFV application note for more information about selecting the external components. ●Power Dissipation The power dissipation of the BD555BKFV is mainly dependent on the fixed DC/DC operating frequency and the applied load at the SW and BLDR terminals. This power consumption should be less than 80% of the allowable package power dissipation. www.rohm.com © 2012 ROHM Co., Ltd. All rights reserved. TSZ22111・ ・ 15・ ・001 7/10 TSZ02201-0W1W0C300010-1-2 03.Aug.2012 Rev.001 Datasheet BD555BKFV ●Operational Notes 1) Absolute Maximum Ratings When the IC is operated outside of the given absolute maximum ratings, internal devices of the IC can break down and resulting failure modes may be impossible to identify. In case any special operating mode exceeding the absolute maximum ratings is assumed, consideration should be given to take physical safety measures including the use of fuses or overvoltage clamping devices, etc. 2) Special Caution on Terminal Connections a. Never connect the FB terminal directly to GND. To enable PCC mode, the FB terminal is best pulled down by a resistor (>10k) to GND. b. Always protect the ISYS terminal with a reverse diode to GND in case of using ground current sensing in a dimmable LED driver application. For additional operation stability, a capacitor >1uF is added between GND and ISYS terminals. c. Never connect a capacitive load to the REF and OSC terminals. Only resistive loads can be connected to these terminals. d. Always short GND and PGND terminals on the application PCB. Special care needs to be taken to keep the GND terminal free from noise. None of the IC terminals except ISYS should have a negative potential. e. No external voltage should be applied to the IC terminals when the supply voltage on the SUP terminal is absent. 3) Erroneous Mounting and Terminal Short Circuit If the IC is mounted incorrectly or in case of a short circuit between supply line, ground and other terminals, the IC may malfunction or break down. 4) Thermal Shut Down When the IC junction temperature exceeds about 175°C, the TSD function disables internal circuits of the IC and pulls down the internal supply voltage VDDH. The SW terminal will cease switching which stops the DC/DC operation of the application. This safety measure also reduces potential physical damage as a result of overheating in case of a short circuit between VDDH, SW, BLDR and GND terminals. In the thermal design of the application (PCB), the maximum ambient operating temperature and SSOP-B14 maximum power dissipation (Pd) need to be considered to avoid unwanted triggering of the TSD function. 5) Operation in Electromagnetic Fields The functionality of this IC is not guaranteed in the presence of (strong) electromagnetic fields. 6) External Buffer Capacitors The capacitor value derating of vs. voltage and temperature and lifetime degradation need to be taken into account in order to ensure proper operation of the IC. ●Status of this document The English version of this document is formal specification. Versions in other languages are for reference only. In case of a difference between this English document and a translated version, this formal English version takes priority. www.rohm.com © 2012 ROHM Co., Ltd. All rights reserved. TSZ22111・ ・ 15・ ・001 8/10 TSZ02201-0W1W0C300010-1-2 03.Aug.2012 Rev.001 Datasheet BD555BKFV ●Ordering Information B D 5 5 5 B K Part No. F V - Package FV: SSOP14 E 2 Packaging and forming specification E2: Embossed tape and reel None: Tray, Tube ●Physical Dimension Tape and Reel Information SSOP-B14 <Tape and Reel information> 5.0 ± 0.2 8 0.3Min. 4.4 ± 0.2 6.4 ± 0.3 14 1 Tape Embossed carrier tape Quantity 2500pcs Direction of feed E2 The direction is the 1pin of product is at the upper left when you hold ( reel on the left hand and you pull out the tape on the right hand ) 7 0.10 1.15 ± 0.1 0.15 ± 0.1 0.1 0.65 0.22 ± 0.1 1pin Reel (Unit : mm) Direction of feed ∗ Order quantity needs to be multiple of the minimum quantity. ●Marking Diagram (TOP VIEW) SSOP-B14 Product Name. 555BK LOT No. 1PIN MARK www.rohm.com © 2012 ROHM Co., Ltd. All rights reserved. TSZ22111・ ・ 15・ ・001 9/10 TSZ02201-0W1W0C300010-1-2 03.Aug.2012 Rev.001 Datasheet BD555BKFV ●Revision History Date Revision 03.Aug.2012 001 Changes New Release www.rohm.com © 2012 ROHM Co., Ltd. All rights reserved. TSZ22111・ ・ 15・ ・001 10/10 TSZ02201-0W1W0C300010-1-2 03.Aug.2012 Rev.001 Datasheet Notice ●General Precaution 1) Before you use our Products, you are requested to carefully read this document and fully understand its contents. ROHM shall not be in any way responsible or liable for failure, malfunction or accident arising from the use of any ROHM’s Products against warning, caution or note contained in this document. 2) All information contained in this document is current as of the issuing date and subject to change without any prior notice. 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