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ap3105 d document number: ds 36914 rev . 2 - 2 1 of 13 www.diodes.com february 2014 ? diodes incorporated ap3105 d a product line of diodes incorporated cost effective green pwm controller description the ap3105d is a low startup current, current mode pwm controller with green - mode power - saving operation. the pwm switching frequency at normal oper ation is set with 65khz. when the load decreases, the frequency will reduce and when at a very low load, the ic will enter the ?burst mode? to minimize switching loss. about 20 k hz frequency switching is to avoid the audible noise as well as reducing the standby loss. the skip mode point can be adjusted through the external resistor connected to the current sense resistor. the ap3105d features a lot of functions such as the leading - edge blanking (leb) of the current sensing, internal slope compensation an d several protection functions including cycle - by - cycle current limit (ocp), vcc over voltage protection (vovp), otp and olp protection. the versatile latch function can be set by the customer through few components. this ic is available in sot - 23 - 6 packa ge. features ? very low start - up current ? current mode control ? non - audible - noise green - mode control ? skip mode adjustable ? internal slope compensation ? soft start during startup process ? frequency fold back for high average efficiency ? secondary short winding protection with focp ? soft switching for reducing emi ? vcc maintain mode ? latch function for otp ? useful pin fault protection: sense p in f loating ctrl pin s hort to g round fb/opto - coupler open/short ? comprehensive system protection feature: vcc over voltage protection (vovp) over load protection (olp) ? mini size with packages ? pin to pin compatible with ap3103 pin assignments (top view) sot - 23 - 6 ( k package) applications ? audio power supply ? ac/dc switching power supply 1 2 3 4 5 pin 1 mark 6 gnd fb ctrl gate vcc sense
ap3105 d document number: ds 36914 rev . 2 - 2 2 of 13 www.diodes.com february 2014 ? diodes incorporated ap3105 d a product line of diodes incorporated typical applications circuit pin description s pin number p in name function 1 gnd signal ground. current return for driver and control circuits 2 fb feedback. directly connected to the opto - coupler 3 ctrl latch trigger if this pin voltage drops below a threshold or over another threshold, leave ctrl pin open if this function is not needed. connecting a ntc th ermistor to gnd can achieve otp protection 4 sense current sense 5 vcc supply voltage of driver and control circuits 6 gate gate driver output ~ ~ + - v c c g n d g a t e f b s e n s e c t r l ~ a z 4 3 1 a p 3 1 0 5 d l 2 t 1 r 1 3 c 7 c 6 c 8 r 1 4 r 1 5 r 1 6 r 1 7 r 1 8 c 9 u 2 c 1 0 r 1 2 r 1 1 r 1 0 r 9 r 8 c 5 r 6 r 1 9 c 4 r 5 r 4 c 2 c 1 v r 1 u 1 n t c r 2 r 3 f 1 r 7 c 3 c 1 1 n t c r 2 0
ap3105 d document number: ds 36914 rev . 2 - 2 3 of 13 www.diodes.com february 2014 ? diodes incorporated ap3105 d a product line of diodes incorporated functional block diagram g n d g a t e 2 5 0 n s l e b d r i v e r 1 3 v q d c l k r b d f f o s c 0 . 8 5 v v c c _ o v p o l p v c c 3 2 v 2 8 v v c c _ o v p o v p u v l o u v l o 1 5 . 5 v 8 . 6 v i n t e r n a l b i a s 0 . 5 v a u t o r e c o v e r y p r o t e c t i o n a p 3 1 0 5 d 1 0 0 a l i n e c o m p e n s a t i o n f b r 2 r b u r s t p w m 1 . 1 v s o f t s t a r t 0 . 5 v c t r l _ h 1 . 8 v l a t c h - o f f p r o t e c t i o n o c p 3 2 m s d e l a y o l p f o c p f o c p 2 . 5 v 3 . 6 v 0 . 6 v 1 0 k c t r l _ h c t r l _ l c t r l _ l 1 2 5 3 6 c t r l s e n s e 4
ap3105 d document number: ds 36914 rev . 2 - 2 4 of 13 www.diodes.com february 2014 ? diodes incorporated ap3105 d a product line of diodes incorporated absolute maximum ratings ( note 1 ) symbol parameter rating unit v cc power supply voltage 30 v i o gate output current 350 ma v fb , v sense , v ctrl input voltage to fb, sense, ctrl - 0.3 to 7 v ja thermal resistance (junction to ambient) 250 c /w p d power dissipation at t a < + 25 c 500 mw t j operating junction temperature - 40 to + 150 c t stg storage temperature range + 150 c C esd ( human body model) 3000 v C esd ( machine model) 300 v note 1: stresses greater than those listed under absolute maximum ratings may cause permanent damage to the device. these a re stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under recom mended operating 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 supply voltage 10 2 5 v
ap3105 d document number: ds 36914 rev . 2 - 2 5 of 13 www.diodes.com february 2014 ? diodes incorporated ap3105 d a product line of diodes incorporated electrical characteristics (@ t a = + 25c, v cc = 16v, unless otherwise specified .) symbol parameter conditions min typ max unit supply voltage (vcc pin) i startup startup current C 2 5 25 a i cc operating supply current v fb =0v, c l =1nf 0.5 0.85 1.2 ma v fb =3v, c l =0nf 0.6 1.2 2.0 C uvlo (on) C 14.5 15.5 16.5 v C v cc maintain C 9.7 10.2 10.7 v C u vlo (off) C 7.6 8.6 9.6 v C v cc ovp C 27 28.5 30 v C v cc clamp i cc =5ma 31 34 C v pwm section/oscillator section C maximum duty cycle C 70 75 80 % C oscillation frequency C 60 65 70 khz C green mode frequency C 20 C 30 khz ? C frequency temperature stability - 20 o c to 125 o c (note 2) C C 5 % ? C frequency voltage stability v cc =12v to 30v C C 3 % ? current sense section (sense pin) v c s maximum sense voltage v fb = 3.6 v 0. 85 0.9 0.95 v C focp voltage C 1.65 1.8 1.95 v C leb time of sense C 150 250 350 ns C delay to output (note 2) C C 100 C ns C soft - start time C 3 5 8 ms feedback input section (fb pin) C the ratio of input voltage to current sense voltage C 2.5 3 3.5 v /v C input impedance C 7 10 13 k C source current v fb =0v - 0.75 - 0.5 - 0.25 ma C green mode threshold C C 2 C v C input voltage for zero duty C 1.3 1.55 1.8 v output section (gate pin) C output low level i o =20ma, v cc =12v C C 1 v C output high level i o =20ma, v cc =12v 8 C C v C output clamping C 11 13 15 v C rising time (note 2) c l = 1nf, v cc =13v C 150 250 ns C falling time (note 2) c l =1nf, v cc =13v C 50 100 ns
ap3105 d document number: ds 36914 rev . 2 - 2 6 of 13 www.diodes.com february 2014 ? diodes incorporated ap3105 d a product line of diodes incorporated electrical characteristics (cont.) (@ t a = + 25c, v cc = 16v, unless otherwise specified .) protection section (ctrl pin) C source current C 90 100 110 a C internal reference voltage C C 1.5 C v C low threshold trigger for latch C 0.47 0.5 0.53 v C high threshold trigger for latch C 2.35 2.5 2.65 v C pull - up current (note 3) C C C 2 ma delay time section C delay of short circuit protection C 22 32 40 ms C delay of hiccup protection vcc ovp C 25 C s note s: 2 . guaranteed by design. 3 . the sourcing current of ctrl pin must be limited below 5ma.otherwise it may cause permanent damage to the device.
ap3105 d document number: ds 36914 rev . 2 - 2 7 of 13 www.diodes.com february 2014 ? diodes incorporated ap3105 d a product line of diodes incorporated performance characteristics startup voltage v s. ambient temperature shutdown voltage vs. ambient temperature startup current v s. ambient temperature operating current v s . ambient temperature ctrl utilization ovp and otp ovp otp -40 -20 0 20 40 60 80 100 120 140 13.0 13.5 14.0 14.5 15.0 15.5 16.0 16.5 17.0 17.5 18.0 startup voltage (v) ambient temperature ( o c) c t r l v c c n t c o p t i o n -40 -20 0 20 40 60 80 100 120 140 0.0 0.5 1.0 1.5 2.0 2.5 3.0 operating current (ma) ambient temperature ( o c) -40 -20 0 20 40 60 80 100 120 140 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0 7.5 8.0 startup current ( ? a) ambient temperature ( o c) -40 -20 0 20 40 60 80 100 120 140 7.0 7.5 8.0 8.5 9.0 9.5 10.0 shutdown voltage (v) ambient temperature ( o c) c t r l v c c n t c o p t i o n v c c c t r l n t c o p t i o n
ap3105 d document number: ds 36914 rev . 2 - 2 8 of 13 www.diodes.com february 2014 ? diodes incorporated ap3105 d a product line of diodes incorporated operation description the ap3105d is specifically designed for off - line ac - dc power supply used in audio power supply applications. it offers a cost effective solution with a versatile protection function. start - up current and uvlo the start - up current of ap3105d is optimized to rea lize ultra - low current (5 a typical) so that vcc capacitor can be charged more quickly. the direct benefit of low start - up current is the availability of using large start - up resistor, which minimizes the resistor power loss for high voltage ac input. an uvlo comparator is included in ap3105d to detect the voltage on vcc pi n. it ensures that ap3105d can draw adequate energy from hold - up capacitor during power - on. the turn - on threshold is 15.5v and the turn - off threshold is 8.6v. current sense comparator and pwm latch the ap3105d o perates as a current mode controller, the output switch conduction is initiated by every oscillator cycle and is terminated w hen the peak inductor current reaches the threshold level established by the fb pin. the inductor current signal is converted to a voltage signal by inserting a reference sense resistor r s . the inductor current under normal operating conditions is controlled by the voltage at fb pin. the relation between peak inductor current (i pk ) and v fb is: moreover, focp with 1.8v threshold is only about 100ns delay, which can avoid some catastrophic damages such as secondary rectifier short test. few drive cycles can alleviate the destruction range and get better protection. leading - edge blanking a narrow spike on the le ading edge of the current waveform can usually be observed when the power mosfet is turned on. a 250ns leading - edge blank is built - in to prevent the false - triggering caused by the turn - on spike. during this period, the current limit comparator is disabled and the gate driver can not be switched off. at the time of turning on the mosfet, a negative undershoot (maybe larger than - 0.3v) can occur on the sense pin. so it is strongly recommended to add a small rc filter or at least connect a resistor r on th is pin to protect the ic (shown as figure 1 ). figure 1 built - in slope compensation it is well known that a continuous current mode smps may become unstable when the duty cycle exceeds 50%. the built - in slope compensation can improve the stability, so there is no need for design engineer to spend much time on that. fb pin and short circuit protection this pin is normally connected to the opto - coupler and always paralleled with a capacitor for loop compensation. when the voltage at this pin is greater than 4.2v and lasts for about 32ms, the ic will enter the protection mode. the system will enter hiccup mode to wait the v cc decreasing s fb pk r 3 / ) 8 . 0 v ( i ? ? f b s e n s e g a t e g n d c t r l 6 1 3 4 a p 3 1 0 5 d v c c 5 2 l a r g e u n d e r s h o o t ( m o r e t h a n - 0 . 3 v ) m a y d a m a g e t h e s e n s e p i n r c n e c e s s a r y
ap3105 d document number: ds 36914 rev . 2 - 2 9 of 13 www.diodes.com february 2014 ? diodes incorporated ap3105 d a product line of diodes incorporated operation description (cont.) to low uvlo level, then the ic will try to restart until the failure removed. and when this voltage is less than 1.55v, the ic w ill stop the drive pulse immediately. therefore, this feature can be used for short circuit protection, which makes the system imm une from damage. normally, output short makes the v fb value to the maximum because the opto - coupler is cut off. v cc maintain mode during light load or step load , v fb will drop and be lower than 1.55v, thus the pwm drive signal will be stopped, and there is no more new energy transfered due to no switching. therefore, the ic supply voltage may reduce to the shutdown threshold voltage and syst em may enter the une xpected restart mode. to avoid this, the ap3105d hold a so - called v cc maintain mode which can supply energy to vcc. when v cc decreases to a setting threshold, the v cc maintain comparator will output some drive signal to make the system switch and provide a proper energy to vcc pin. the v cc mainta in function will cooperate the pwm and burst mode loop which can make the output voltage variation be within the regulation. this mode is very useful for reducing startup resistor loss and achieve a better standby performance with a low value vcc capacitor. the v cc is not easy to touch the shutdown threshold during the startup process and step load. this will also simplify the s ystem design. the normal vcc voltage is suggested to be designed a little higher than v cc maintain threshold thus can achieve the best balance between the standby and step load performance. system protection and pin fault protection the ap3105d provides versatile system and pin fault protections. the ocp comparator realizes the cycle - by - cycle curren t limiting (ocp). in universal input line voltage, the ic realizes the constant over load protection (olp). vcc over voltage protection can be applied as th e p rimary ovp or opto - coupler broken protection. the ap3105d also has pin fault connection protection including floating and short connection. the floating pin protecti on include s the sense, fb, etc. the short pin protection includes the ctrl pin short protec tion. when these pins are floated or ctrl pin is shorted to ground, pwm switching will be disabled, thus protecting the power system. latch protection function for some applications, the system requires the latch protection function. the ctrl pin has tw o kinds of modes to trigger the latch protection: high level trigger and low level trigger. the low threshold is 0.5v and high threshold voltage is 2.5v. some version will hav e only one mode. once the latch protection is triggered, the ic will disable the output signal, and the bulk capacitor provides the energy to ic through the startup resistor to ensure the ic disable the output (latch mode). this mode will not be released until the ac input is shut off. so, the de - latch time is mainly depending on the h v startup bulk capacitor value. therefore, if the system want a short de - latch time, it is better for the startup resistor take power from the point before the rectifier bridge as illustrated in below figure . v c c g n d f b c t r l a p 3 1 0 5 d s e n s e a c m a i n s ( 9 0 v t o 2 6 5 v ) c b u s g a t e 1 2 3 4 5 6
ap3105 d document number: ds 36914 rev . 2 - 2 10 of 13 www.diodes.com february 2014 ? diodes incorporated ap3105 d a product line of diodes incorporated ordering information diodes ic?s pb - free products with "g1" suffix in the part number, are rohs compliant and green . package part number marking id packing type sot - 23 - 6 ap3105dktr - g1 gke tape & reel protection functions frequency vovp olp & socp ctrl (low) ctrl (high) 65khz auto - recoverable auto - recoverable latch auto - recoverable a p 3 1 0 5 d x x x - x x p a c k i n g p a c k a g e t r : t a p e & r e e l k : s o t - 2 3 - 6 g 1 : g r e e n p r o d u c t n a m e r o h s / g r e e n
ap3105 d document number: ds 36914 rev . 2 - 2 11 of 13 www.diodes.com february 2014 ? diodes incorporated ap3105 d a product line of diodes incorporated package outline dimensions (all d imensions in mm ( inch ) . ) (1) package t ype: sot - 23 - 6 2 . 8 2 0 ( 0 . 1 1 1 ) 3 . 1 0 0 ( 0 . 1 2 2 ) 2 . 6 5 0 ( 0 . 1 0 4 ) 3 . 0 0 0 ( 0 . 1 1 8 ) 1 . 5 0 0 ( 0 . 0 5 9 ) 1 . 7 0 0 ( 0 . 0 6 7 ) 0 . 9 5 0 ( 0 . 0 3 7 ) t y p 1 . 8 0 0 ( 0 . 0 7 1 ) 2 . 0 0 0 ( 0 . 0 7 9 ) 0 . 3 0 0 ( 0 . 0 1 2 ) 0 . 5 0 0 ( 0 . 0 2 0 ) 0 . 7 0 0 ( 0 . 0 2 8 ) r e f 0 . 1 0 0 ( 0 . 0 0 4 ) 0 . 2 0 0 ( 0 . 0 0 8 ) 0 8 0 . 2 0 0 ( 0 . 0 0 8 ) 0 . 3 0 0 ( 0 . 0 1 2 ) 0 . 6 0 0 ( 0 . 0 2 4 ) 0 . 0 0 0 ( 0 . 0 0 0 ) 0 . 1 5 0 ( 0 . 0 0 6 ) 0 . 9 0 0 ( 0 . 0 3 5 ) 1 . 3 0 0 ( 0 . 0 5 1 ) 1 . 4 5 0 ( 0 . 0 5 7 ) m a x 1 2 3 4 5 6 p i n 1 m a r k
ap3105 d document number: ds 36914 rev . 2 - 2 12 of 13 www.diodes.com february 2014 ? diodes incorporated ap3105 d a product line of diodes incorporated suggested pad layout (1) package type: sot - 23 - 6 dimensions z (mm)/(inch) g (mm)/(inch) x (mm)/(inch) y (mm)/(inch) e (mm)/(inch) value 3.600/0.142 1.600/0.063 0.700/0.028 1.000/0.039 0.950/0.037 e e g z y x
ap3105 d document number: ds 36914 rev . 2 - 2 13 of 13 www.diodes.com february 2014 ? diodes incorporated ap3105 d a product line of diodes incorporated 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 does 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 indem nify 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 applic ation. 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 d ocument is written in english but may be translated into multiple languages for reference. only the english version of this document is the final and determinative format released by diodes incorporated. life support diodes incorporated products are spe cifically 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 syst ems 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. custo mers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support device s or systems, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety - related requirements concerning 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, cu stomers 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 ? 2013 , diodes incorporated www.diodes .com

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