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irs2983 spbf 1 www.irf.com ? 20 1 5 international rectifier january 15 , 201 5 led flyback control ic features ? flyback led driver ? critical - conduction / transition mode operation ? primary constant power control ? burst mode operation at light load ? over - current protection ? micropower startup (150 ? a) ? low quiescent current (2.5 ma) ? lat ch immunity and esd protection ? open load over voltage protection ? noise immunity typical applications ? led drivers product summary topology flyback i o+ & i o - (typical) 200 ma / 4 00 ma t r & t f (typical) 60 ns / 30 ns package 8 - lead soic irs2 983 spb f ordering information bas e part number package type standard pack complete part number form quantity irs2983 spbf s o8n tube/bulk 95 irs2983spbf tape and reel 2500 irs2983s trpbf
irs2983 spbf 2 www.irf.com ? 20 1 5 international rectifier january 15 , 201 5 table of contents page description 3 qualification information 4 absolute maximum ratings 5 recommended operating conditions 5 electrical characteristics 6 functional block diagram 8 state diagram 9 input/output pin equivalent circuit diagram 10 lead definitions 11 lead assignments 11 application information and additional details 12 package details 15 tape and reel details 16 part marking information 17
irs2983 spbf 3 www.irf.com ? 20 1 5 international rectifier january 15 , 201 5 description the irs2983 is a fully integrated, fully protected smps control ic designed to drive flyback converter led drivers. the irs2983 features include primary side power reg ulation, which allows a basic converter to be implemented without the need for an opto isolator in a flyback led driver with a fixed load enabling a low cost, high reliability isolated led driver design to be realized. the irs2983 may also be used in conve rters that do include secondary feedback through an opto isolator. other features of the irs2983 include a high voltage startup enabling vcc supply to be derived initially from the high voltage dc bus until the auxiliary inductor winding is able to take ov er. the irs2983 operates in critical conduction (crcm) or discontinuous (dcm) modes and is fully protected against open and short circuit as well as inductor saturation. the irs2983 may be used in single stage flyback led drivers with an unsmoothed dc bus to obtain high power factor and low thd . typical connection diagram d f b t 1 b r 1 c i n m 1 r g c v o u t r c s c f r f d v c c i c 1 r i n r d c r z x 1 a c l i n e i n p u t c d c c c o m p c s c o m o u t v c c c o m p v d c h v z x i r s 2 9 8 3 7 6 5 1 2 3 4 8 r z x 2 c v c c r o u t r a d j d s n r s n c s n c i d z r z q v c c c s
irs2983 spbf 4 www.irf.com ? 20 1 5 international rectifier january 15 , 201 5 qualification information ? ?? comments: this family of ics has passed jedecs industrial qualification. irs ??? ? qualification standards can be found at international rectifiers web site ?? ???
irs2983 spbf 5 www.irf.com ? 20 1 5 international rectifier january 15 , 201 5 absolute maximum ratings absolute maximum ratings indicate sustained limits beyond which damage to the device may occur. all voltage parameters are absolute voltages referenced to com, all currents are defined positive into any lead. the thermal resistance and power dissipation ratings are measured under board mounted and still air conditions. symbol definition min. max. units v cc ic low voltage supply ? q q ?
irs2983 spbf 6 www.irf.com ? 20 1 5 international rectifier january 15 , 201 5 electrical characteristics v cc =14v +/ - 0.25v, c out = 1000pf, v comp = v oc = v bus = v z x = 0v, t a =25 ?
irs2983 spbf 7 www.irf.com ? 20 1 5 international rectifier january 15 , 201 5 electrical characteristics (contd) ? ? ? C ?
irs2983 spbf 8 www.irf.com ? 20 1 5 international rectifier january 15 , 201 5 functional block diagram o u t c o m p z x v z x + / v z x - v c c c s 5 7 3 4 v o v t h v c l a m p v d c 2 h v s t a r t u p h v 1 v p r e f v c c 8 c o m 6 u v l o q s r q r e s t a r t t i m e r v c s t h q s r q s e t d o m i n a n t b l a n k t i m e r a v e r a g e r x k m u l t m i n i m u m o f f t i m e
irs2983 spbf 9 www.irf.com ? 20 1 5 international rectifier january 15 , 201 5 state diagram u v l o m o d e i c c = i q c c u v h v r e g = o n o u t = l o w c o m p = h e l d l o w p o w e r t u r n e d o n s t a r t u p m o d e o u t = s w i t c h i n g v c c > v c c u v + f a u l t m o d e o u t = l o w c o m p = h e l d l o w v z x > v o v t h c u r r e n t l i m i t o u t = l o w v c s > v c s t h w a t c h d o g t i m e o u t r e g u l a t i n g m o d e o u t = s w i t c h i n g h v r e g = o f f v m u l t > 1 v v c s < v c s t h - v o v h y s v c s > v c s t h v c s < v c s t h - v o v h y s v z x > v o v t h
irs2983 spbf 10 www.irf.com ? 20 1 5 international rectifier january 15 , 201 5 input/outpu t pin equivalent circuit diagrams v c c c o m c o m p , v d c , c s , z x , o u t e s d d i o d e e s d d i o d e v c l a m p
irs2983 spbf 11 www.irf.com ? 20 1 5 international rectifier january 15 , 201 5 lead definitions symbol description hv high voltage startup input vdc full wave voltage input comp compensation and averaging capacitor input zx pfc zero - crossing & over - voltag e detection cs pfc current sensing input com ic power & signal ground out gate driver output vcc logic & low - side gate driver supply lead assignments c s c o m o u t v c c c o m p v d c h v z x i r s 2 9 8 3 7 6 5 1 2 3 4 8
irs2983 spbf 12 www.irf.com ? 20 1 5 international rectifier january 15 , 201 5 application information and additi onal details the irs2983 is a switched mode controller ic designed for use in flyback or buck - boost led driver s . an internal high voltage regulator suppl ies the ic low voltage vcc supply during startup allowing operation directly from a dc input voltage up to 600v. internal high voltage regulator in order to begin operating the irs2983 requires the low voltage vcc supply to be raised above the under voltage lockout positive threshold (vccuv+) and to continue ope r ating vcc must be maintained above the un der voltage lockout negative threshold (vccuv - ). the hv regulator enables the irs2983 based led driver to start up very rapidly and deliver light within 0.5s of switch on over the range of line voltage input . when th e switching converter is running vcc is normally supplied through an auxiliary winding . when operating with primary regulation (see below) as steady state operation is reached the hv regulator is deactivated. the auxiliary winding from the flyback or buck - boost inductor /transformer provides out put voltage and zero - crossing (zx) i nformation as well as supplying vcc . in the event of a short circuit at the output the vcc supply from the auxiliary winding collapses below vccuv - causing the irs2983 to shut off. t he startup sequence begins again in a continuous power f. t t s v ( t ) v o u t ( t ) v c s ( t )
irs2983 spbf 13 www.irf.com ? 20 1 5 international rectifier january 15 , 201 5 primary current limiting at very low input voltages the power regulation loop would require a ve ry high peak current that may exceed t he maximum rating of the inductor. in order to prevent this from occurring , the irs2983 also includes cycle by cycle prima ry current limiting with a threshold vcsth at the cs pin input. under low line or fault conditio ns where the mosfet current is abnormally high the gate drive is switched off after the blanking time tblank. leading edge blanking is necessary to avoid false tripping due to the fast high current switch on transient that occurs at switch on of the mosfet resulting from the ci rcuit parasitics. this is also blanked from the averaging input that feeds the power regulation multiplie r in order to prevent inaccuracies. the irs2983 normally operates in critical conduction mode (crcm), also known as transition o r boundary mode. the transformer auxiliary winding provide s a signal to the irs2983 that indicates when all of the energy stored in the inductor has been transferred to the output. this triggers the start of the next switching cycle. the auxiliary winding voltage is divided down through rzx1 and rzx2 to provide the zx pin input signal . figure 2: cycle by cycle current limiting the pulse that appears at zx has an amplitude proportional to the secondary output voltage and there fore the dc output voltage: [1] where, n a = number of turns on the auxiliary winding n s = number of turns on the secondary winding vout = dc output voltage (led voltage) when the converter mosfet switches off the voltage vzx transitions high . the values of rzx1 and rzx2 must be selected so that this voltage always exceeds the vzx+ threshold. i f the irs2983 is used in a converter that is required to drive loads over a range of voltage an add itional feedback cir cuit is needed to control the output current. in this case the vzx voltage needs to exceed vzx+ at the minimum load voltage. if vzx does not exceed vzx+ the irs2983 cannot operate in crcm and remains pulsing and waiting for twd timeout for the next cycle. when vzx exceeds vzx+ the irs2983 waits until the vzx then drops below vzx - again to initiate the next switching cycle. a capacitor may be added in parallel with rzx2 to add some delay if needed to minimize switching loss by switching on in the minimum poi nt or valley of the drain voltage. t t s v ( t ) v o u t ( t ) v c s ( t ) v c s t h ) 2 1 ( 2 rzx rzx n vout rzx n vzx s a ? ? ? t t s v ( t ) v o u t ( t ) v z x ( t )
irs2983 spbf 14 www.irf.com ? 20 1 5 international rectifier january 15 , 201 5 over voltage protection the zx is a multi - function input also used for output over voltage limiting. in a flyback or buck - boost converter if the load becomes disconn e cted the output voltage can become very high causing damage to comp onents as well as present ing an electrical hazard. in order to protect against this the irs2983 senses the output voltage indirectly through the zx input , which is proportional t o the actual output voltage. if the zx input voltage exceeds vovth when the mo sfet switches off the gate drive remain s switched off for a twd period before starting the next cycle regardless of when the zx voltage transitions low. t he irs2983 also discharges the comp capacitor to zero so that the next cycle will begin at minimum du ty cycle and ramp up slowly . this protection scheme allows the led load to be hot connected and disconnected from the converter output without risk of damaging the circuit or of high voltages appearing at the output. care should be taken however to avoid l ed damage due to output capacitor discharge. an ntc thermistor at the output may be needed to limit the current surge. the overvoltage threshold is set by choosing the values of rzx1 and r zx2 appropriately, according to the formula: [2] the recommended over voltage threshold is 25% above the normal operating voltage of the led load. operating with a secondary feedback circuit in applications where accurate current regulation over a wide input voltage range or range of output voltages is required, the irs2983 can be used in conjunction with a secondary sensing and feedback circuit. figure 4: overvoltage protection the feedback circuit is usually fed through an opto isolator. this can be connecte d to the irs2983 in the following way: figure 5: secondary feedback circuit a simple output voltage feedback scheme is shown in figure 5 to illustrate how the opto isolator is connected to the irs2983 to create a feedback circuit. the vdc input is tied to com leaving the internal multiplier output at zero so that the comp output provides pull up . the opto isolator feedback pulls down on the comp voltage to reduce the on time as the opto diode current is increased driven by a secondary error amplifier circuit. the hv startup is not disabled in this operating mode but draws only micro current if vcc is biased above 17v. this is easily done by using a series pass transistor with the base biased with an 18v zener diode to supply vcc. 2 ) 2 1 ( rzx n rzx rzx n vovth vout a s ov ? ? ? t t w d v ( t ) v o u t ( t ) v z x ( t ) v c o m p ( t ) t 1 c i n m p f c r p f c r c s c f 2 r f d v c c i c 1 r z x 1 c s c o m o u t v c c c o m p v d c h v z x i r s 2 9 8 3 7 6 5 1 2 3 4 8 r z x 2 c v c c s e c o n d a r y e r r o r f e e d b a c k d z x q v c c r v c c
irs2983 spbf 15 www.irf.com ? 20 1 5 international rectifier january 15 , 201 5 package details
irs2983 spbf 16 www.irf.com ? 20 1 5 international rectifier january 15 , 201 5 tape and reel details e f a c d g a b h note : controlling dim ension in m m loaded tape feed direction a h f e g d b c carrier tape dimension for 8soicn code min max min max a 7.90 8.10 0.311 0.318 b 3.90 4.10 0.153 0.161 c 11.70 12.30 0.46 0.484 d 5.45 5.55 0.214 0.218 e 6.30 6.50 0.248 0.255 f 5.10 5.30 0.200 0.208 g 1.50 n/a 0.059 n/a h 1.50 1.60 0.059 0.062 metric imperial reel dimensions for 8soicn code min max min max a 329.60 330.25 12.976 13.001 b 20.95 21.45 0.824 0.844 c 12.80 13.20 0.503 0.519 d 1.95 2.45 0.767 0.096 e 98.00 102.00 3.858 4.015 f n/a 18.40 n/a 0.724 g 14.50 17.10 0.570 0.673 h 12.40 14.40 0.488 0.566 metric imperial
irs2983 spbf 17 www.irf.com ? 20 1 5 international rectifier january 15 , 201 5 part marking information the information provided in this document is believed to be accurate and reliable. however, internationa l rectifier assumes no responsibility for the consequences of the use of this information. international rectifier assumes no responsibility for an y infringement of patents or of other rights of third parties which may result from the use of this informat ion. no license is granted by implication or otherwise under any patent or patent rights of international rectifier. the specifications mentioned in this document are su bject to change without notice. this document supersedes and replaces all informatio n previously supplied. for technical support, please contact irs technical assistance center s 2 9 8 3 i r l o g o y w w ? p a r t n u m b e r d a t e c o d e p i n 1 i d e n t i f i e r l o t c o d e ( p r o d m o d e C a s s e m b l y s i t e c o d e p e r s c o p 2 0 0 - 0 0 2 ? x x x x m a r k i n g c o d e l e a d f r e e r e l e a s e d n o n - l e a d f r e e r e l e a s e d ? p

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