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al3022 document number: ds36514 rev. 3 - 2 1 of 12 www.diodes.com september 2014 ? diodes incorporated al3022 3043 a product line of diodes incorporated new product pwm boost controller description the al3022 is a constant 140 k hz, voltage mode, external compensation boost controller. the al3022 has low feedback voltage and make s it ideal for low cost led backlight supplies. the al3022 can support external pwm dimming and a nalog dimming. the al3022 offer s complete system protection with integrate d under voltage lockout, over voltage p rotection, over current protection, output voltage ( v out ) s hort to gnd protection and over temperature protection circuitry . to satisfy the limited pcb mounting space requirements , this ic is avai lable in so - 8 package to save space. features ? voltage mode pwm controller ? low 0.2v r eference voltage ? fixed 140 k hz frequency ? exte r nal pwm dimming and analog d imming ? low shutdown c urrent (0.1 a) ? external c ompensation ? built - in uvlo function ? built - in ovp ? b uilt - in otp ? built - in ocp ? built - in v out s hort to gnd p rotection ? totally lead - free & fully rohs compliant (notes 1 & 2) ? halogen and antimony free. green device (note 3) pin assignments (top view) so - 8 applications ? led tv ? led monitor ? led dis play module 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 antimon y - 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 vin out gnd cs en ovp comp fb c 5 1 0 0 p f u 1 a l 3 0 2 2 e n 8 v i n 1 c o m p 6 c s 4 g n d 3 o u t 2 f b 5 o v p 7 c 6 2 2 0 n f r 2 2 0 k ? r 7 1 . 1 ? c 1 2 2 f / 2 5 v r 1 1 0 k ? v o u t r 5 1 5 0 k ? r 4 1 0 k ? r 6 5 . 1 k ? d 1 l 1 2 2 h / 2 a r 3 2 . 2 ? q 1 3 1 2 v i n e n c 4 1 f r 8 1 . 2 ? c 2 1 0 f / 5 0 v c 3 1 0 f / 5 0 v
al3022 document number: ds36514 rev. 3 - 2 2 of 12 www.diodes.com september 2014 ? diodes incorporated al3022 3043 a product line of diodes incorporated new product pin description s pin number p in name function 1 v in supply input pin. a capacitor should be connected between the vin pin and gnd pin to keep the dc input voltage constant. 2 out gate driver pin . t his pin is connected to external mosfet gate to turn it on/off. 3 gnd ground pin 4 cs over c urrent protection pin 5 fb feedback pin. this pin is connected to an external resistor divider to program the system output voltage. 6 comp compensation pin. this pin is the output of the inter nal error amplifier. c o mp is force d to low when v in <3.6v. 7 ovp overvoltage detection pin 8 en enable and dimming p in. when en input voltage is lower than 0.3v, disable the ic. when en input voltage is higher than 2.6v, enable the ic . pwm dimming can be provide d by an external control signal greater t han 100hz, duty cycle from 1% to 9 0% . in addition, a nalog dimming can be provid ed by a dc signal rang ed from 0. 8 v to 2.4v. functional block diagram e a o s c i l l a t o r o v p & u v p e n f b g n d o v p c o n t r o l l o g i c o v e r t e m p e r a t u r e p r o t e c t i o n v i n 0 t o 2 0 0 m v r e f b a n d g a p v c c r e g u l a t o r 1 . 2 5 v v c c c o m p c o m p s a w p u l s e o u t d r i v e r 1 8 6 5 7 4 3 2 o c p c s
al3022 document number: ds36514 rev. 3 - 2 3 of 12 www.diodes.com september 2014 ? diodes incorporated al3022 3043 a product line of diodes incorporated new product absolute maximum ratings ( note 4 ) symbol parameter rating unit v in input voltage - 0.3 to 20 v v en en pin voltage - 0.3 to v in +0.3 v v gate out pin voltage 20 v v ovp ovp pin voltage 7 v v fb f b pin voltage - 0.3 to + 5.5 v t j operating junction temperature + 150 c t stg storage temperature range - 65 to + 150 c t lead lead temperature (soldering, 10sec) + 260 c ja thermal resistance (junction to ambient) 105 c /w C C 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 indi cated under recommended 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 in input voltage 4 18 v t a opera ting ambient temperature - 40 + 85 c
al3022 document number: ds36514 rev. 3 - 2 4 of 12 www.diodes.com september 2014 ? diodes incorporated al3022 3043 a product line of diodes incorporated new product electrical characteristics (@ v in = 5 v, t a = + 25 c, unless otherwise specified . ) symbol parameter conditions min typ max unit supply voltage ( vin p in ) v in input v oltage C 4.0 C 18 v i q quiescent current test a t v fb = 0 .3v C 5 C ma i shdn shutdown supply current v en = 0 v C 0.1 C a under voltage lockout v uvlo input uvlo threshold v in rising 3.6 3.8 4.0 v v hys input uvlo hysteresis C 100 200 300 mv over voltage protection C over v oltage t hreshold C 1.45 1.55 1.65 v C under v oltage t hreshold C C 0.1 C v over c urrent protection v cs over current t hreshold duty = 90% C 0.33 C v over temperature protection t otsd thermal shutdown temperature C C + 160 C c C thermal shutdown hysteresis C C + 20 C c e rror ampl ifier g m error amplifier transconductance C C 400 C a/v enable (en pin) v en - off en pin threshold C C C 0.3 v v en - on C 2.6 C C v v en - dim en pin dimming threshold C C 0.8 C v C C 2.4 C v voltage refe ren ce (fb pin) v fb feedback voltage C 0.194 0.2 0.206 v i fb feedback bias current C C 35 100 na ? v fb line r egulation v in = 4.5v to 1 8v C 2 20 mv gate driver (out pin) f osc oscillator frequency C 110 140 170 k hz d max max. duty cycle C 90 95 99 % v gate out pin voltage (note 5 ) i out = 10 m a C v in - 1 C v t rise rising t ime v in = 5v, o ut pin load = 1 nf C 65.5 C ns t fall falling t ime C 88.5 C ns note 5 : guaranteed by design .
al3022 document number: ds36514 rev. 3 - 2 5 of 12 www.diodes.com september 2014 ? diodes incorporated al3022 3043 a product line of diodes incorporated new product performance characteristic ( @t a = +25c, v dd = 5 v, unless otherwise specified ) quiescent current vs. input voltage shutdown supply current vs. input voltage feedback voltage vs. inp ut voltage oscillator frequency vs. input voltage over v oltage protection voltage vs. input voltage over current protection voltage vs. input voltage 4 6 8 10 12 14 16 18 20 22 24 130 135 140 145 150 oscillator frequency (khz) input voltage (v) 2 4 6 8 10 12 14 16 18 20 22 24 1.20 1.25 1.30 1.35 1.40 1.45 1.50 1.55 1.60 over voltge protection voltage (v) input voltage (v) 2 4 6 8 10 12 14 16 18 20 22 24 5.2 5.4 5.6 5.8 6.0 quiescent current (ma) input voltage (v) 4 6 8 10 12 14 16 18 20 22 24 0.0 0.2 0.4 shutdown supply current ( ? a) input voltage (v) 2 4 6 8 10 12 14 16 18 20 22 24 0.300 0.305 0.310 0.315 0.320 0.325 0.330 0.335 0.340 over current protection voltage (v) input voltage (v) 2 4 6 8 10 12 14 16 18 20 22 24 0.00 0.05 0.10 0.15 0.20 0.25 0.30 feedback voltage (v) input voltage (v)
al3022 document number: ds36514 rev. 3 - 2 6 of 12 www.diodes.com september 2014 ? diodes incorporated al3022 3043 a product line of diodes incorporated new product performance ch aracteristic ( cont. @t a = +25c, v dd = 5v, unless otherwise specified ) fb voltage vs. en voltage quiescent current vs. temperature shut d own supply current vs. temperature feedback voltage vs. temperature oscillator frequency vs. temperature -50 -25 0 25 50 75 100 125 -1 0 1 2 shutdown supply current ( ? a) temperature ( o c) -50 -25 0 25 50 75 100 125 0.16 0.17 0.18 0.19 0.20 0.21 0.22 feedback voltage (v) temperature ( o c) 0.5 1.0 1.5 2.0 2.5 3.0 3.5 0 20 40 60 80 100 120 140 160 180 200 220 fb voltage (mv) en voltage (v) -50 -25 0 25 50 75 100 125 4.0 4.5 5.0 5.5 6.0 quiescent current (ma) temperature ( o c) -50 -25 0 25 50 75 100 125 130 135 140 145 150 oscillator frequency (khz) temperature ( o c)
al3022 document number: ds36514 rev. 3 - 2 7 of 12 www.diodes.com september 2014 ? diodes incorporated al3022 3043 a product line of diodes incorporated new product application information general operation the al3022 uses a constant frequency, voltage mode control scheme to provid e excellent line and load regulation. to drive led load, the al3022 can be connect ed as shown in the typical applications circuit on page 1 . the maximum duty cycle of the pwm controller is limited to 90%. pwm dimming input can be provid ed by an exter nal control signal greater than 100hz, duty ratio of 1% to 9 0% . in addition, a nalog dimming can be provid ed by a dc signal ranged from 0.8 v to 2.4v. the al3022 offers comprehensive protection features such as uvlo, ocp, ovp, otp, led open a nd v out s hort to gnd. enable/ dimming c ontrol the al3022 uses en pin to turn on and off the controller and also perform digital ( pwm ) dimming. when en input voltage is lower than 0.3v, the controller turn s off and the shut down current ca n be limited below 0.1 a. when en input voltage is higher than 2.6v, the controller turn s on and the reference voltage is set to 0.2v. the al3022 has an internal 8015% k ? pull low resistor on the en pin, thus the device is normally in the off state or shutdown mode operation. when a pwm s ignal was presented into the en pin of the al3022 shown in figure 1 below. 1). when the en pin is high er than 2.6v , the device will turn on and the output current is at the programmed maximum level . 2). when the en pin is low er than 0.3v , the device will turn off a nd the output current goes to 0 ma. if the frequency of the pwm signal is greater th an 100hz, the human eye cannot detect the on and off state of the led s . the human eye can only see a dimmed diode rather than a pulsed brightness. this dimming method provides a controlled inrush current at turn - on. the pwm duty cycle from 0% to 1 0 0% controls the output current from 0ma to the maximum programmed level . figure 1 . digital dimming control using a pwm signal in en pin analog dimming control the analog dimming is to inject a constant dc voltage to en pin shown in figure 2 below . the feedback voltage is indirectly adjusted when the en pin voltage is from 0.8 v to 2.4v, which can be used as dimming control. the output led current can be adjusted from min imum to max imum level by apply ing the dc voltage level from 0.8 v to 2.4v . comparing with all kinds of dimming control, this method features a best output voltage and leds current. a l 3 0 2 2 f b e n r p w m
al3022 document number: ds36514 rev. 3 - 2 8 of 12 www.diodes.com september 2014 ? diodes incorporated al3022 3043 a product line of diodes incorporated new product application information ( c ont.) figure 2 . analog dimming control using a dc voltage signal in en pin soft start control the al3022 external compens ation circuit can clamp the output waveform to soft start smoothly. o peration protection 1. under voltage lockout the al3022 provides an under voltage lockout circuit to prevent it from undefined status when startup. the under voltage lock o ut circu it turns the driver off when supplying voltage drops below 3.6v. the uvlo circuit has 200mv hysteresis, which means the device starts up a gain when v in rise s to 3.8v. 2. over voltage protection / led open protection the controller has an internal ovp circuit. the controller output voltage will boost too high when leds are disconnected from the circuit or fail to open. the al3022 will latch off the output if the ovp pin senses a voltage that is larger than 1.55v, and the power switching will be turned off. the latched off status can be reset by reducing the supply voltage to lower than 3.6v or en lower than 0.3v. 3. under voltage protection / v out short t o g nd protection the al3022 monitors the ovp pin, if the ovp pin voltage is less than 0.1v, mos fet drive output will turn off. when ovp is higher than 0.1v, system can auto recover. this protects the converter if v out is shorted to ground. 4. over current protection the al3022 integrates an ocp circuit. the cs pin is connected to the voltage - se nsor (rcs) that placed between the drain of mos and gnd. if the voltage on cs pin exceeds 0.33 v, it is turned off immediately and will not turn on until the next cycle begins. 5. o ver temperature protection the al3022 monitors the temperature of itsel f. the al3022 shuts itself off if the temperature exceeds the threshold value (typically + 160 o c). this is a no - latched protection. the device recovers once the temperature has decreased approximately + 20 o c. a l 3 0 2 2 f b e n r d c v o l t a g e 0 . 8 v t o 2 . 4 v
al3022 document number: ds36514 rev. 3 - 2 9 of 12 www.diodes.com september 2014 ? diodes incorporated al3022 3043 a product line of diodes incorporated new product ordering information package temperature range part number marking id packing so - 8 - 40c to +85 c al3022mtr - g1 l3022m - g1 3000/13tape & reel mark ing informatio n (top view) 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 . l3022 m - g1 ywwaxx - a l 3 0 2 2 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
al3022 document number: ds36514 rev. 3 - 2 10 of 12 www.diodes.com september 2014 ? diodes incorporated al3022 3043 a product line of diodes incorporated new product package outline dimensions (all d imensions in mm (i nch) . ) (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 ~
al3022 document number: ds36514 rev. 3 - 2 11 of 12 www.diodes.com september 2014 ? diodes incorporated al3022 3043 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) val ue 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
al3022 document number: ds36514 rev. 3 - 2 12 of 12 www.diodes.com september 2014 ? diodes incorporated al3022 3043 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 warr anties 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 changes without further notice to this document and any product described herein. diodes incorporated does not assume any liability a rising out of the application or use of this document or any product described herein; neither does diodes incorporated co nvey any license under its patent or trademark rights, nor the rights of others. any customer or user of this document or products described herein in such appli cations shall assume all risks of such use and will agree to hold diodes incorporated and all the companies whose products are represented on diodes incorporated website, harmless against all damages. diodes incorporated does not warrant or accept any liability whatsoever in respect of any products purchased through unauthor ized sales channel. s hould customers purchase or use diodes incorporated products for any unintended or unauthorized application, customers shall indemnify and hold diodes incorporated and its representatives harmless against all claims, damages, expenses, and attorney fees ar ising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized application. products described herein may be covered by one or more united states, international or foreign patents pending. prod uct names and markings noted herein may also be covered by one or more united states, international or foreign trademarks. this document is written in english but may be translated into multiple languages for reference. only the english version of this d ocument is the final and determinative format released by diodes incorporated. life support diodes incorporated products are specifically not authorized for use as critical components in life support devices or system s without the express written approva l of the chief executive officer of diodes incorporated. as used herein: a. life support devices or systems are devices or systems which: 1. are intended to implant into the body, or 2. support or sustain life and whose failure to perform when proper ly used in accordance with instructions for use provided in 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 c an be reasonably expected to cause the failure of the life support device or to affect its safety or effectiveness. customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support d evices 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, customers must fully indemnify diodes incorpora ted 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

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