View AP1684A_8215174.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

AP1684A document number: ds 3709 5 rev. 1 - 2 1 of 13 www.diodes.com august 2014 ? diodes incorporated AP1684A a product line of diodes incorporated new product ac/dc, high pf, high efficiency led driver controller description the AP1684A is a high performance ac/dc power factor corrected led driver controller. the device use s pulse frequency modulation (pfm) technology to regulate output current while achieving high power factor and low thd. it operates as a boundary condition mode ( bcm ) buck controller which is good for emi. the AP1684A provides accurate constant current (cc ) regulation while removing the opto - coupler and secondary control circuitry. it also eliminates the need of loop compensation circuitry while maintaining stability. it can meet the requirement of iec6100 - 3 - 2 harmonic standard. the AP1684A features low st art - up current, low operation current. it adopts valley on switching mode to achieve high efficiency. it also has rich protection features including over voltage, short circuit, over temperature protection. the AP1684A is available in so - 8 package . appli cations ? led bulb lamp ? led down light ? gu10/e27 ? other non - dimmable led light ing pin assignments (top view) so - 8 features ? low start - up current ? high pf and low thd (pf > 0.9, thd < 30%) ? high e fficiency up to 92% ? bcm m ode ? output current accuracy on ic level: 2% ? tight led o pen v oltage ? valley - mode s witching to m inimize the t ransition l oss ? mosfet driver up to 25w ? open - load and r eload d etection ? internal protections: ? under voltage lock out (uvlo) ? leading - edge blanking (leb) ? output short protection ? output open protection ? over temperature protection ? low s ystem c ost ? so - 8 p ackage ? totally lead - free & fully rohs compliant (notes 1 & 2) ? halogen and antimony free. green device (note 3 ) note s: 1 . no purposely added lead. fully eu directive 2002/95/ec (rohs) & 2011/65/eu (rohs 2) compliant. 2. see http://www.diodes.com/quality/lead_free.html for more information about diodes incorporateds definitions of hal ogen - and antimony - free, "green" and lead - f ree . 3. halogen - and antimony - free "green products are defined as those which contain < 900ppm bromine, <900ppm chlorine (<1500ppm total br + cl) and <1000ppm antimony compounds. typical applications circuit 1 2 3 4 8 7 6 5 nc ri rm cs fb gnd out vcc t 1 o u t + v c c f b o u t c s g n d c 3 r 7 r 5 r 6 r 4 d 1 c 4 r 3 q 1 a c i n p u t f 1 v r 1 d b 1 c 2 l 1 c 1 r 8 d 2 r 1 r 2 r i r m r 9 a p 1 6 8 4 a 5 7 4 6 3 2 8
AP1684A document number: ds 3709 5 rev. 1 - 2 2 of 13 www.diodes.com august 2014 ? diodes incorporated AP1684A a product line of diodes incorporated new product pin description s pin number p in name function 1 nc no connection 2 ri the initial tonp tuning resistor 3 r m set the operating mode 4 cs primary current sensing 5 fb the feedback voltage sensing from the auxiliary winding 6 gnd ground 7 out gate driver output 8 vcc supply voltage of gate driver and control circuits of the ic functional block diagram r e g u l a t o r & b i a s t o n s d e t e c t o r t o n s p o w e r _ e n d r i v e r f b v c c o u t p f m r s q v r e f c c _ c t r l t o n p _ c t r l c s g n d v d d p r o t e c t i o n & l a t c h p r o c s _ o c p f b _ c v f b _ o v p v c c _ o v p l o g i c s e t i n i t i a l t o n p & s e t t h e i c w o r k i n g i n b c m r m r i c o n s t a n t t u r n - o n t i m e g e n e r a t i o n 5 2 3 4 6 7 8
AP1684A document number: ds 3709 5 rev. 1 - 2 3 of 13 www.diodes.com august 2014 ? diodes incorporated AP1684A a product line of diodes incorporated new product absolute maximum ratings (@ t a = + 25c, unless otherwise specified . note 4 ) symbol parameter rating unit v cc power supply voltage - 0.3 to 3 5 v i out driver output current internally limited ma v cs voltage at cs to gnd - 0.3 to + 7 v v fb fb input voltage - 40 to + 10 v t j operating junction temperature - 40 to + 150 c t stg storage temperature - 65 to + 150 c t lead lead temperature (soldering, 10 sec) + 300 c p d power dissipation ( t a = + 50 c ) 0.65 w ? ja thermal resistance (junction to ambient) 1 6 0 c/w C esd ( human body model) 20 00 v C esd ( machine model) 2 00 v note 4 : stresses greater than those listed under absolute maximum ratings may cause permanent damage to the device. these are stres s ratings only, and functional operation of the device at these or any other conditions beyond those indicated under recommended o perating conditions is not implied. exposure to absolute maximum ratings for extended periods may affect device reliability. recommended operating conditions symbol parameter min max unit v cc power supply voltage 7 2 5 v t a ambient temperature - 40 + 105 c
AP1684A document number: ds 3709 5 rev. 1 - 2 4 of 13 www.diodes.com august 2014 ? diodes incorporated AP1684A a product line of diodes incorporated new product electrical characteristics (@ t a = + 25c, unless otherwise specified .) symbol parameter conditions min typ max unit uvlo section v th (st) start - up threshold C 13 14.5 16 v v opr (min) minim um operating voltage after turn on 5.5 6.5 7.5 v v cc_ovp vcc ovp voltage C C 28 C v C v cc delatch voltage (note 5 ) C 3 4 5 v standby current section i st start - up current v cc = v th (st) - 0.5v, before start up C C 2 0 a i cc ( opr ) operating current s tatic C 900 13 00 a drive output section v gate gate voltage C 11 12 14 v i source_l low driver source current C 35 40 45 ma i source_h high driver source current C 90 100 1 2 0 ma r ds(on) sink resistance C 6 7 8 ? current sense section v cs_ r ef current s ense r eference C C 1 C v v cs _ c lamp current sense reference clamp C 1.2 1.4 C v t onp_min minimum t onp C 7 00 C 1000 n s t d (h - l) delay to output (note 5 ) C 50 150 250 ns feedback input section i fb feedback pin input leakage current v fb = 2 v C C 4 a v fb _cv fb cv threshold C 3.8 4 4.2 v v fb _ovp fb ovp threshold C 4.5 6 7.5 v output current C system o utput c urrent on f inal t est b oard C C C 2 % over temperature protection section C shutdown temperature (note 5 ) C + 1 5 0 C C c C temperature hysteresis (note 5 ) C C + 20 C c note 5 : these parameters, although guaranteed by design, are not 100% tested in production.
AP1684A document number: ds 3709 5 rev. 1 - 2 5 of 13 www.diodes.com august 2014 ? diodes incorporated AP1684A a product line of diodes incorporated new product performance characteristics supply current vs. supply voltage cv threshold vs. supply voltage start - up voltage v s. ambient temperature minimal operating voltage v s. ambient temperature start - up current v s. ambient temperature operating current v s . ambient temperature -40 -20 0 20 40 60 80 100 120 500 600 700 800 900 1000 operating current ( ? a) ambient temperature ( o c) 6 8 10 12 14 16 18 20 22 24 26 28 3.6 3.7 3.8 3.9 4.0 4.1 4.2 cv threshold (v) supply voltage (v) -40 -20 0 20 40 60 80 100 120 12.0 12.5 13.0 13.5 14.0 14.5 15.0 15.5 16.0 start-up voltage (v) ambient temperature ( o c) 0 4 8 12 16 20 24 28 0 200 400 600 800 1000 1200 supply current ( ? a) supply voltage (v) -40 -20 0 20 40 60 80 100 120 6.2 6.3 6.4 6.5 6.6 6.7 6.8 6.9 7.0 7.1 7.2 minimal operating voltage (v) ambient temperature ( o c) -40 -20 0 20 40 60 80 100 120 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 start-up current ( ? a) ambient temperature ( o c)
AP1684A document number: ds 3709 5 rev. 1 - 2 6 of 13 www.diodes.com august 2014 ? diodes incorporated AP1684A a product line of diodes incorporated new product performance characteristics (cont.) cv threshold vs. ambient temperature fb leakage current vs. ambient temperature -40 -20 0 20 40 60 80 100 120 3.00 3.25 3.50 3.75 4.00 4.25 4.50 cv threshold (v) ambient temperature ( o c) -40 -20 0 20 40 60 80 100 120 1.00 1.25 1.50 1.75 2.00 2.25 fb leakage current ( ? a) ambient temperature ( o c)
AP1684A document number: ds 3709 5 rev. 1 - 2 7 of 13 www.diodes.com august 2014 ? diodes incorporated AP1684A a product line of diodes incorporated new product application information the AP1684A is designed for single voltage application, and it features high power factor correction (pfc) , low total harmonic distortion (thd) , low bom cost and good emi performance. the device can be widely used in non - dimmable led application such as gu10, bulb lamps, down lamp, etc. the AP1684A adopts constant on time control method within one ac cycle to achieve the high p ower f actor and low thd . t he control scheme is very simple, the power factor correction effectiveness is obvious, and the constant current control is also good en ough. figure 1. typical buck application circuit components selection guide if the systems output spec is changed, please refer to the design sheet of the AP1684A and select the compatible system parameter. when the system need s to be adjusted slightly, please refer to the table below and adjust the value of the related component. i tem description related c omponents i o led current r8 output c urrent r ipple small current ripple is good for led life c4 t on_initial system initial on time, used to start up the system r1 output o pen v oltage setting the output voltage when the led is open r5, r6 line c ompensation to get a good line regulation r7, r9 startup t ime system startup time r3, c3, t1 emi pass en 55022 class b with 6db margin l1, c1, c2 design p arameters setting the c urrent s ense r esistor r8 as the AP1684A adopts constant on time control method, the current of the inductance will follow the input voltage to get a sinusoidal wave . t he current sense pin cs of the AP1684A will sense the peak current of the inductance by sensing the voltage dropped on the current sense resistor r8 , and the constant current control is realized by control ling the peak current. in buck structure , when the v o is higher than v in , no energy will be transferred from input to output which is called dead zone , and c onsidering the dead zone of buck structure, t he output current can be calculated as below: where , v cs_ref is the reference of the current sense, and the typical value is 1v . k is the current modification coefficient, and the value of k is approximate to be 0.7. 8 1 _ _ r v k i ref cs mean o ? ? ? ? t 1 o u t + v c c f b o u t c s g n d c 3 r 7 r 5 r 6 r 4 d 1 c 4 r 3 q 1 a c i n p u t f 1 v r 1 d b 1 c 2 l 1 c 1 r 8 d 2 r 1 r 2 r i r m r 9 a p 1 6 8 4 a 5 7 4 6 3 2 8
AP1684A document number: ds 3709 5 rev. 1 - 2 8 of 13 www.diodes.com august 2014 ? diodes incorporated AP1684A a product line of diodes incorporated new product application information (cont.) so, the current sense resistor r8 is determined: transformer selection (t1) the non - isolated buck circuit in f igure 1 is usually selected, and the system is operating at boundary conduction mode. the systems operating frequency do es not keep constant, t he minimum switching frequency at the crest is set as f min , a nd then the buck inductance value l can be got: where , v o is the output voltage . v in_rms is the rms value of the input voltage . the next step is determin ing the transformers winding turns number, the worst case operation condition of transformer is at the peak voltage area of sine waveform input voltage where the current of across the inductance is the maximum value. the transformer design should be based on the worst case operation condition to g uarantee that the transformer is not saturated. according to ferrari's law of electromagnetic induction, the winding turns number of the buck inductance n l is: where , a e is the core effective area . b m is the maximum magnetic flux density . the auxiliary winding is power supply for v cc , the winding turns number n aux is: where , v cc is the power supply v oltage for ic from auxiliary winding . v d is the voltage drop of the freewheel diode . setting the i nitial o n t ime as the AP1684A adopts constant on - time control method, the AP1684A will generate an initial on time to start a working cycle. if the initial on time is longer than the rated on time, overshoot will happen which could damage the led . and a good system performance does not permit overshoot, so the appropriate initial on time should be guaranteed. and initial on time is determined by resister r1 shown in f igure 1 . according to initial on time generation mechanism, the t o n_initial is to guarantee the system with no overshoot phenomenon, the resistor is selected the system operation mode is determined by r2 , to guarantee the system working at bcm mode, resistance r2 is generally selected as r2 r1 . s r t initial on 12 _ 10 1 80 ? ? ? ? mean o ref cs i v k r _ _ 8 ? ? ? ? 8 _ r b a v l b a i l n m e ref cs m e pk l ? ? ? ? ? ? ? ? ? ? ? ? 10 max _ _ 10 2 8 25 . 1 1 rms in u r l r d o cc l aux v v v n n ? ? ? min _ _ _ 2 8 ) 2 ( f v v v r v v l rms in ref cs o o rms in ? ? ? ? ? ? ? ?
AP1684A document number: ds 3709 5 rev. 1 - 2 9 of 13 www.diodes.com august 2014 ? diodes incorporated AP1684A a product line of diodes incorporated new product application information (cont.) valley on c ontrol m ethod the valley on function can provide low turn - on switching losses for buck converter. the voltage across the drain and source of the power mosfet is reflected by the auxiliary winding of the buck transformer. the voltage is sensed by the fb pin. figure 2 . valley on control according to figure 2, when the falling edge of 0.1v is sensed by the fb pin, the AP1684A will see the t off time i s over and delay 1s to start a new operating cycle. in this way we can realize valley on function. fault protection over voltage p rotection and output open protection figure 3 . ovp circuit the output voltage is sensed by the auxiliary winding voltage of the b uck transformer, the v cc pin and fb pin provide over voltage protection function. when the output is open or large transient happens, the output voltage will exceed the rated value. when the voltag e of v cc cap exceeds v cc_ovp or v fb_cv , the over voltage is tri ggered and the ic will discharge v cc . w hen the v cc is below the uvlo threshold voltage, the ic will start a new work cycle and the v cc cap is charged again by start resistance. if the over voltage condition still exists, the system will work in hiccup mode . output short protection when the output is shorted, the output voltage will be clamped at 0. at this condition, v cc will drop down without auxiliary winding for power supply. and the v cc will drop to uvlo threshold voltage, the ic will shut down and res tart a new operating cycle, and the v cc is charged by startup resistance. when the v cc is higher than v cc_start voltage, the ic will output a bunch of pulse to control power mosfet on and off, which will consume the energy stored in the v cc cap, because of no v cc supply from the auxiliary winding, the v cc will drop down to v cc uvlo threshold voltage again. if output short condition still exists, the system will operate in hiccup mode . over temperature protection the AP1684A has two kinds of over temperature protection processes. first, the system is operating normally, the ambient temperature is changed to + 170c suddenly, the ic will trigger over temperature protection which leads to a latch work mode. second, if the system starts, the over temperature protection will be triggered when the ambient temperature is higher than + 150c. so the AP1684A can startup successfully when the ambient temperature is less than + 150c. v c c f b r 5 r 6 a p 1 6 8 4 a 0 . 1 v 1 s v a l l e y f b
AP1684A document number: ds 3709 5 rev. 1 - 2 10 of 13 www.diodes.com august 2014 ? diodes incorporated AP1684A a product line of diodes incorporated new product ordering information diodes ics pb - free products with "g1" suffix in the part number, are rohs compliant and green . package temperature range part number marking id packing so - 8 - 40 c to + 1 0 5 c ap168 4 a mtr - g1 16 8 4 a m - g1 4 000/13tape & reel mark ing informatio n (top view) 1684a m - g1 ywwaxx first and s econd l ines: logo and marking id third l ine: date code y: y ear ww: w ork w eek of m olding a: a ssembly h ouse c ode xx: 7 th and 8 th d igits of batch no . a p 1 6 8 4 a x x x C p a c k i n g p a c k a g e p r o d u c t n a m e t r : t a p e & r e e l m : s o - 8 g 1 : g r e e n r o h s / g r e e n
AP1684A document number: ds 3709 5 rev. 1 - 2 11 of 13 www.diodes.com august 2014 ? diodes incorporated AP1684A a product line of diodes incorporated new product package outline dimensions (all dimensions in mm (inch) .) (1) package type: so - 8 0 8 1 7 r 0 . 1 5 0 ( 0 . 0 0 6 ) r 0 . 1 5 0 ( 0 . 0 0 6 ) 1 . 0 0 0 ( 0 . 0 3 9 ) 0 . 3 0 0 ( 0 . 0 1 2 ) 0 . 5 1 0 ( 0 . 0 2 0 ) 1 . 3 5 0 ( 0 . 0 5 3 ) 1 . 7 5 0 ( 0 . 0 6 9 ) 0 . 1 0 0 ( 0 . 0 0 4 ) 0 . 3 0 0 ( 0 . 0 1 2 ) 3 . 8 0 0 ( 0 . 1 5 0 ) 4 . 0 0 0 ( 0 . 1 5 7 ) 7 7 2 0 : 1 d 1 . 2 7 0 ( 0 . 0 5 0 ) t y p 0 . 1 5 0 ( 0 . 0 0 6 ) 0 . 2 5 0 ( 0 . 0 1 0 ) 8 d 5 . 8 0 0 ( 0 . 2 2 8 ) 6 . 2 0 0 ( 0 . 2 4 4 ) 0 . 6 0 0 ( 0 . 0 2 4 ) 0 . 7 2 5 ( 0 . 0 2 9 ) 0 . 3 2 0 ( 0 . 0 1 3 ) 8 0 . 4 5 0 ( 0 . 0 1 7 ) 0 . 8 2 0 ( 0 . 0 3 2 ) 4 . 7 0 0 ( 0 . 1 8 5 ) 5 . 1 0 0 ( 0 . 2 0 1 ) n o t e : e j e c t h o l e , o r i e n t e d h o l e a n d m o l d m a r k i s o p t i o n a l . o p t i o n 1 o p t i o n 1 o p t i o n 2 0 . 3 5 0 ( 0 . 0 1 4 ) t y p t y p t y p 9 ~ 9 ~
AP1684A document number: ds 3709 5 rev. 1 - 2 12 of 13 www.diodes.com august 2014 ? diodes incorporated AP1684A a product line of diodes incorporated new product suggested pad layout (1) package type: so - 8 dimensions z (mm)/(inch) g (mm)/(inch) x (mm)/(inch) y (mm)/(inch) e (mm)/(inch) value 6.900/0.272 3.900/0.154 0.650/0.026 1.500/0.059 1.270/0.050 g r i d p l a c e m e n t c o u r t y a r d z g y e x
AP1684A document number: ds 3709 5 rev. 1 - 2 13 of 13 www.diodes.com august 2014 ? diodes incorporated AP1684A a product line of diodes incorporated new product important notice diodes incorporated makes no warranty of any kind, express or implied, with regards to this document, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose (and their equivalents under the laws of any jurisdiction). diodes incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other c hanges without further notice to this document and any product described herein. diodes incorporated does not assume any liability arising out of the application or use of this document or any product described herein; neither does diodes incorporated convey any license unde r its patent or trademark rights, nor the rights of others. any customer or user of this document or products described herein in such applications shall assume all risks of such use and will agree to hold diodes incorporated and all the companies whose products are represented on diod es incorporated website, harmless against all damages. diodes incorporated do es not warrant or accept any liability whatsoever in respect of any products purchased through unauthorized sales channel. should customers purchase or use diodes incorporated products for any unintended or unauthorized application, customers shall indemni fy and hold diodes incorporated and its representatives harmless against all claims, damages, expenses, and attorney fees arising ou t of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized applicat ion. products described herein may be covered by one or more united states, international or foreign patents pending. product nam es and markings noted herein may also be covered by one or more united states, international or foreign trademarks. this doc ument is written in english but may be translated into multiple languages for reference. only the english version of this do cument is the final and determinative format released by diodes incorporated. life support diodes incorporated products are speci fically not authorized for use as critical components in life support devices or systems without the express written approval of the chief executive officer of diodes incorporated. as used herein: a. life support devices or systems are devices or system s which: 1. are intended to implant into the body, or 2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided i n the labeling can be reasonably expected to result in significant injury to the user. b. a critical component is any component in a life support device or system whose failure to perform can be reasonably expe cted to cause the failure of the life support device or to affect its safety or effectiveness. custom ers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support devices or systems, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety - related requirements c oncerning their products and any use of diodes incorporated products in such safety - critical, life support devices or systems, notwithstanding any devices - or systems - related information or support that may be provided by diodes incorporated. further, cus tomers must fully indemnify diodes incorporated and its representatives against any damages arising out of the use of diodes incorporated products in such safety - critical, life support devices or systems. copyright ? 201 4 , diodes incorporated www.diodes. com

▲Up To Search▲

Price & Availability of AP1684A

	To Download AP1684A Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .