sd 690xs _datasheet hangzhou silan microelectronics co.,ltd rev:0. 4 201 3.0 4.07 http://www.silan.com.cn page 1 of 7 non - isolated led lightin g drive ic with buil t - in high - voltage mosfet, high pfc and high constant curren t accuracy descriptio n sd690 xs is designed for non - isolated led driving with floating buck structure and built - in 600v mosfet . w ith this structure, indu ctor current is sensed and closed - loop is formed with the internal error amplifier for high constant current accuracy and high input/output regulation rate. also, high pf in full range is available as its own pfc control . boundary c onduction mode is adopte d for decreasing switching loss and improving the conversion efficiency. sd690 xs integrates various protections, such as output open circuit protection, output short circuit protection, cycle - by - cycle current limit protection, over temperature protection a nd vcc over voltage protection. t he start - up current and operating current are low and highlight led can be driven with high efficiency in full range ( 85vac~265vac ). feature s ? proprietary constant control method (patent) ? built - in 600v mosfet ? constant curre nt with high accuracy for led ( <3% ) ? pf>0.9 in full voltage range ? boundary - c onduction mode ? l ed short circuit protection (patent) ? led open circuit protection ? vcc over/under voltage protection ? over temperature protection ? over current protection applicatio n ? bulb lamp ? t5/t8 led lamp ? v arious led lighting ordering information part no. package marking material packing sd 6901 s tr sop - 7 - 225 - 1.27 sd 6901 s halogen free tape&reel sd6902str sop - 7 - 225 - 1.27 sd 6902s halogen free tape&reel SD6904Str sop - 7 - 225 - 1.27 sd 6904s halogen free tape&reel
silan microelectronics sd 690xs _datasheet hangzhou silan microelectronics co.,ltd block diagram absolute maximum ratings characteristics symbol rating unit supply voltage v cc - 0.22 v f eedback voltage v zcd - 0. 6 .5 v samp le voltage v cs - 6.5 6.5 v comp voltage v comp - 0.6 .5 v drain voltage v drain - 0. 600 v unction temperature range t - 0 125 electrical character istics unless otherwise stated, v cc 1 6 v , t amb 25 character istics symbol test condition min. typ. max. unit operating voltage v cc after start 10 16 1 v uvlo vh uvlo h 15 16 17 v uvlo vl uvlo l 7.5 . 5 9.5 v vcc ovp vcc ovp 2 0.5 22 2 v start - up current i start b efore start, v cc 15v 0 10
silan microelectronics sd 690xs _datasheet hangzhou silan microelectronics co.,ltd character istics symbol test condition min. typ. max. unit voltage feedback zcd ovp voltage zcd ovp i ncrease zcd to the threshold value .1 .25 . v zcd ovp delay -- 9 00 -- ns zcd vl -- 0.1 -- v zcd vh -- 0. -- v zcd short circuit detect voltage zcd sl 0.5 0.5 0.65 v operational amplifier i nput reference voltage of t ransconductance amplifier cs ref 165 170 175 mv transconductance of t ransconductance amplifier g m -- 270 -- time parameter max. on time t on , max v comp .5v -- -- high - voltage mosfet on resistance sd6901 s r dson v cc 1 6 v -- 10 -- temperature characterist ics over temperature protection threshold value t sd -- 150 -- c over temperature protection release point -- 130 -- c
silan microelectronics sd 690xs _datasheet hangzhou silan microelectronics co.,ltd pin configurations comp cs vcc 4 3 2 5 6 1 7 zcd drain gnd drain sd690xs pin description pin n o. pin n ame i/o description 1 vcc power p ower supply 2 cs i/o current sense pin comp o o utput of trans - conductance amplifier, connected to gnd through a capacitor zcd i inductor current ero - crossing detection pin 5,6 dr ain o drain output 7 gnd gnd ground pin function description sd690 xs is a non - isola ted led driver ic adopting buck structure. t he function is described below. start control fast start - up is achieved due to very low start - up current. l arge resistor can be used for external start - up resistor. i t features undervoltage protection at vcc and the on/off threshold values are 16v and . 5 v. hysteresis characteristics guarantees that ic can be powered by input capacitor during start - up. w hen the output voltage increases to a certain value after start, vcc will be charged by output through auxiliar y winding or zener diode. vv led - v cc . boundary - conduction mode power mosfet is turned on by inductor current ero - crossing detection. t he ero - crossing of current can be detected by zcd voltage which can be measured through auxiliary winding or resistan ce voltage divider. w hen inductor current is ero crossing, voltage at pin zcd drops rapidly, ic detects the falling edge and turns on power mosfet. boundary - conduction mode provides low turn - on switching losses and high conversion efficiency. constant c urrent accuracy control ic senses the whole inductor current and forms the closed - loop with internal error amplifier to obtain high
silan microelectronics sd 690xs _datasheet hangzhou silan microelectronics co.,ltd c urrent detection and leb with the cycle - by - cycle current limit function, power mosfet will be turned off if c s voltage exceeds a certain value. system still works and power mosfet is turned on in the next period. during leb, limit comparator stops, and mosfet is on during this time. gate drive r gate p in is connected to gate of external mosfet for controlling it s on/off. t oo weak driving of gate will increase power dissipation on mosfet and too strong driving will bring emi. a good tradeoff is achieved through the totem pole gate drive design with appropriate output ability and dead time control. o utput high lev el of gate is clamped at 15v to protect external mosfet. vcc over voltage protection over voltage protection occurs if voltage at vcc is high, mosfet is off and the system restarts automatically. output over voltage protection output voltage is reflected to pin zcd through resistor divider. w hen zcd voltage is higher than the over voltage protection threshold value by .25v, protection occurs, mosfet is off and the system will restart. output short circuit protection w hen zcd voltage is lower than the sh ort circuit protection threshold value by 0.5v, and kept for switch periods, short circuit protection occurs, mosfet is off and the system will restart.
silan microelectronics sd 690xs _datasheet hangzhou silan microelectronics co.,ltd typical application circui t vcc is powered by auxiliary winding ac input comp cs vcc 4 3 2 5 6 1 7 zcd drain gnd drain sd 690 xs vcc is powered by zener diode ac input comp cs vcc 4 3 2 5 6 1 7 zcd drain gnd drain sd 690 xs note : the circuit and parameters are for reference only; please set the parameters of the real application circuit based on the real test.
silan microelectronics sd 690xs _datasheet hangzhou silan microelectronics co.,ltd pack age outlin e sop - 7 - 225 - 1.27 unit: mm 6 . 0 mos devices operate notes : electrostatic charges may exist in many things. please take following preventive measure s to prevent effectively the mos electric ci rcuit as a result of the damage which is caused by discharge : ? ? ? ? d isclaimer : x silan reserves the right to make changes to the information herein for the improvement of the design and performance without further notice! customers should obtain the latest relevant information before placing orders and should verify that such information is complete and current. x all semiconductor products malfunction or fail with some probability under special conditions. when using silan products in system design or complete machine manufacturing, it is the responsibility of the buyer to comply with the safety standards strictly and take essential measures to avoid situations in which a malfunction or failure of such silan products could cause loss of body injury or damage to property. x silan will supply the best possible product for customers!
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