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february 2007 rev. 8 1/25 25 lnbk20 lnb supply and control voltage regulator (parallel interface) feature summary complete interface for two lnbs remote supply and control lnb selection and stand-by function built-in tone oscillator factory trimmed at 22khz fast oscillator start-up facilitates diseqc tm encoding two supply inputs for lowest dissipation bypass function for slave operation lnb short circuit protection and diagnostic auxiliary modulation input extends flexibility cable length compensation internal over temperature protection backward current protection description intended for analog and digital satellite receivers, the lnbk is a monolithic linear voltage regulator, assembled in powerso-20 and so-20, specifically designed to provide the powering voltages and the interfacing signals to the lnb downconverter situated in the antenna via the coaxial cable. it has the same functionality of the lnbp1x and lnbp20 series, at a reduced output current capability. since most satellite receivers have two antenna ports, the output voltage of the regulator is available at one of two logic-selectable output pins (lnba, lnbb). when the ic is powered and put in stand-by (en pin low), both regulator outputs are disabled to allow the antenna downconverters to be supplied/controlled by others satellite receivers sharing the same coaxial lines. in this occurrence the device will limit at 3 ma (max) the backward current that could flow from lnba and lnbb output pins to gnd. (see continuous description). powerso-20 so-20 www.st.com order code part number packages packaging powerso-20 so-20 lnbk20 LNBK20PD-TR lnbk20d2-tr tape & reel
lnbk20 2/25 contents 1 description (continued) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 4 block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 5 electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 6 typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 7 typical application schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 8 package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 9 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
lnbk20 description (continued) 3/25 1 description (continued) for slave operation in single dish, dual receiver systems, the bypass function is implemented by an electronic switch between the master input pin (mi) and the lnba pin, thus leaving all lnb powering and control functions to the master receiver. this electronic switch is closed when the device is powered and en pin is low. the regulator outputs can be logic controlled to be 13 or 18 v (typ.) by mean of the vsel pin for remote controlling of lnbs. additionally, it is possible to increment by 1v (typ.) the selected voltage value to compensate the excess voltage drop along the coaxial cable (llc pin high). in order to reduce the power dissipation of the device when the lowest output voltage is selected, the regulator has two supply input pins v cc1 and v cc2 . they must be powered respectively at 16v (min) and 23v (min), and an internal switch automatically will select the suitable supply pin according to the selected output voltage. if adequate heatsink is provided and higher power losses are acceptable, both supply pins can be powered by the same 23v source without affecting any other circuit performance. the ent (tone enable) pin activates the internal oscillator so that the dc output is modulated by a 0.3 v, 22khz (typ.) square wave. this internal oscillator is factory trimmed within a tolerance of 2khz, thus no further adjustments neither external components are required. a burst coding of the 22khz tone can be accomplished thanks to the fast response of the ent input and the prompt oscillator start-up. this helps designers who want to implement the diseqc tm protocols (a) . in order to improve design flexibility and to allow implementation of newcoming lnb remote control standards, an analogic modulation input pin is available (extm). an appropriate dc blocking capacitor must be used to couple the modulating signal source to the extm pin. when external modulation is not used, the relevant pin can be left open. two pins are dedicated to the overcurrent protection/monitoring: cext and olf. the overcurrent protection circuit works dynamically: as soon as an overload is detected in either lnb output, the output is shut-down for a time t off determined by the capacitor connected between cext and gnd. simultaneously the olf pin, that is an open collector diagnostic output flag, from high impedance state goes low. after the time has elapsed, the output is resumed for a time t on =1/15t off (typ.) and olf goes in high impedance. if the overload is still present, the protection circuit will cycle again through t off and t on until the overload is removed. typical t on +t off value is 1200ms when a 4.7f external capacitor is used. this dynamic operation can greatly reduce the power dissipation in short circuit condition, still ensuring excellent power-on start up even with highly capacitive loads on lnb outputs. the device is packaged in powerso-20 for surface mounting. when a limited functionality in a smaller package matches design needs, a range of cost-effective powerso-10 solutions is also offered. all versions have built-in thermal protection against overheating damage. a. external components are needed to comply to level 2.x and above (bidirectional) diseqc tm bus hardware requirements. diseqc tm is a trademark or eutelsat.
pin configuration lnbk20 4/25 2 pin configuration figure 1. pin connections (top view) so-20 powerso-20 table 1. pin description for powerso-20 symbol name function pin number vs sales type (lnbp) 20cr 20pd 10sp 11sp 12sp 13sp 14sp 15sp 16sp v cc1 supply input 1 15v to 27v supply. it is automatically selected when v out = 13 or 14v 1 2111 111 v cc2 supply input 2 22v to 27v supply. it is automatically selected when v out = 18 or 19v 2 32222222 lnba output port see truth table voltage and port selection. in stand-by mode this port is powered by the mi pin via the internal bypass switch 3 43333333 v sel output voltage selection:13 or 18v (typ) logic control input: see truth table 4 54444444 en port enable logic control input: see truth table 5 65555555 osel port selection logic control input: see truth table 7 7 9 nananananana gnd ground circuit ground. it is internally connected to the die frame 8 1 10 11 20 6666666
lnbk20 pin configuration 5/25 ent 22khz tone enable logic control input: see truth table 9137777777 cext external capacitor timing capacitor used by the dynamic overload protection. typical application is 4.7 f for a 1200ms cycle 10148888888 extm external modulator external modulation input. needs dc decoupling to the ac source. if not used, can be left open. 11 15 na na na 9 na 9 9 llc line length compens. (1v typ) logic control input: see truth table 12 16 na na 9 na 9 na 10 olf over load flag logic output (open collector). normally in high impedance, goes low when current or thermal overload occurs 13 17 na 9 na na 10 10 na mi master input in stand-by mode, the voltage on mi is routed to lnba pin. can be left open if bypass function is not needed 14 18 na 10 10 10 na na na lnbb output port see truth tables for voltage and port selection 15 19 10 na na na na na na table 1. pin description for powerso-20 symbol name function pin number vs sales type (lnbp) 20cr 20pd 10sp 11sp 12sp 13sp 14sp 15sp 16sp
pin configuration lnbk20 6/25 table 2. pin description for so-20 pin n symbol name function 1 llc line length compens. (1v typ) logic control input: see truth table 2 olf over load flag logic output (open collector). normally in high impedance, goes low when current or thermal overload occurs 3 mi master input in stand-by mode, the voltage on mi is routed to lnba pin. can be left open if bypass function is not needed 4 lnbb output port see truth tables for voltage and port selection 5, 6, 15, 16 gnd ground circuit ground. it is internally connected to the die frame 7, 13 n.c. not connected 8v cc1 supply input 1 15v to 27v supply. it is automatically selected when v out = 13 or 14v 9v cc2 supply input 2 22v to 27v supply. it is automatically selected when v out = 18 or 19v 10 lnba output port see truth table voltage and port selection. in stand-by mode this port is powered by the mi pin via the internal bypass switch 11 v sel output voltage selection: 13 or 18v (typ) logic control input: see truth table 12 en port enable logic control input: see truth table 14 osel port selection logic control input: see truth table 18 ent 22khz tone enable logic control input: see truth table 19 cext external capacitor timing capacitor used by the dynamic overload protection. typical application is 4.7 f for a 1200ms cycle 20 extm external modulator external modulation input. needs dc decoupling to the ac source. if not used, can be left open.
lnbk20 maximum ratings 7/25 3 maximum ratings note: absolute maximum ratings are those values beyond which damage to the device may occur. functional operation under these condition is not implied note: all logic input pins have internal pull-down resistor (typ. = 250k ? ) table 3. absolute maximum ratings symbol parameter value unit v i dc input voltage (v cc1 , v cc2 , mi) 28 v v o output voltage -0.3 to 28 v i o output current (lnba, lnbb) internally limited ma v i logic input voltage (ent, en osel, vsel, llc) -0.5 to 7 v i sw bypass switch current 900 ma p d power dissipation at t case < 85c 14 w t stg storage temperature range -40 to +150 c t op operating junction temperature range -40 to +125 c table 4. thermal data symbol parameter powerso-20 so-20 unit r thjc thermal resistance junction-case 2 15 c/w table 5. logic controls truth table control i/o pin name l h out olf i out > i omax or t j > 150c i out < i omax in ent 22khz tone off 22khz tone on in en see table below see table below in osel see table below see table below in vsel see table below see table below in llc see table below see table below en osel vsel llco v lnba v lnbb lxxxv mi - 0.4v (typ.) disabled h l l l 13v (typ.) disabled hlhl 18v (typ.) disabled h l l h 14v (typ.) disabled h l h h 19v (typ.) disabled h h l l disabled 13v (typ.) h h h l disabled 18v (typ.) h h l h disabled 14v (typ.) h h h h disabled 19v (typ.)
block diagram lnbk20 8/25 4 block diagram figure 2. block diagram
lnbk20 electrical characteristics 9/25 5 electrical characteristics table 6. electrical characteristics for lnbk series (t j = 0 to 85c, c i = 0.22f, c o = 0.1f, en=h, ent=l, llc=l, v in1 =16v, v in2 =23v i out =50ma, unless otherwise specified.) symbol parameter test conditions min. typ. max. unit v in1 v cc1 supply voltage i o = 400 ma, ent=h, vsel=l, llc=l 15 27 v i o = 400 ma, ent=h, vsel=l, llc=h 16 27 v v in2 v cc2 supply voltage i o = 400 ma, ent=h, vsel=l, llc=l 22 27 v i o = 400 ma, vsel=l, llc=h 23 27 v v o1 output voltage i o = 400 ma, vsel=l, llc=l 17.3 18 18.7 v i o = 400 ma, ent=h, vsel=l, llc=h 19 v v o2 output voltage i o = 400 ma, vsel=l, llc=l 12.5 13 13.5 v i o = 400 ma, ent=h, vsel=l, llc=h 14 v ? v o line regulation v in1 =15 to 18v, v out =13v 5 50 mv v in2 =22 to 25v, v out =18v 5 50 mv ? v o load regulation v in1 =v in2 =22v, v out =13 or 18v i o = 0 to 3a 65 150 mv svr supply voltage rejection v in1 = v in2 = 23 0.5v ac , f ac = 120 hz, 45 db i max output current limiting 400 500 600 ma t off dynamic overload protection off time output shorted, c ext = 4.7f 1100 ms t on dynamic overload protection on time output shorted, c ext = 4.7f t off /15 ms f tone tone frequency ent=h 20 22 24 khz a tone tone amplitude ent=h 0.55 0.72 0.9 v pp d tone tone duty cycle ent=h 40 50 60 % t r , t f tone rise and fall time ent=h 5 10 15 s g extm external modulation gain ? v out / ? v extm , f = 10hz to 40khz 5 v extm external modulation input voltage ac coupling 400 mv pp z extm external modulation impedance f = 10hz to 40khz 400 ? v sw bypass switch voltage drop (mi to lnba) en=l, i sw =300ma, v cc2 -v mi =4v 0.35 0.6 v v ol overload flag pin logic low i ol =8ma 0.28 0.5 v i oz overload flag pin off state leakage current v oh = 6v 10 a v il control input pin logic low 0.8 v
electrical characteristics lnbk20 10/25 v ih control input pin logic high 2.5 v i ih control pins input current v ih = 5v 20 a i cc supply current output disabled (en=l) 0.3 1 ma ent=h, i out =500ma 3.1 6 ma i obk output backward current en=l, v lnba = v lnbb = 18v v in1 = v in2 = 22v or floating 0.2 3 ma t shdn temperature shutdown threshold 150 c table 6. electrical characteristics for lnbk series (t j = 0 to 85c, c i = 0.22f, c o = 0.1f, en=h, ent=l, llc=l, v in1 =16v, v in2 =23v i out =50ma, unless otherwise specified.) symbol parameter test conditions min. typ. max. unit
lnbk20 typical characteristics 11/25 6 typical characteristics (unless otherwise specified t j = 25c) figure 3. output voltage vs output current figure 4. tone duty cycle vs temperature figure 5. tone fall time vs temperature figure 6. tone frequency vs temperature figure 7. tone rise time vs temperature figure 8. tone amplitude vs temperature
typical characteristics lnbk20 12/25 figure 9. s.v.r. vs frequency figure 10. external modulation vs temperature figure 11. bypass switch drop vs output current figure 12. lnba external modulation gain vs frequency figure 13. bypass switch drop vs output current figure 14. overload flag pin logic low vs flag current
lnbk20 typical characteristics 13/25 figure 15. supply current vs temperature figure 16. supply current vs temperature figure 17. dynamic overload protection (i sc vs time) figure 18. tone enable figure 19. tone disable figure 20. 22khz tone
typical characteristics lnbk20 14/25 figure 21. enable time figure 22. disable time figure 23. 18v to 13v change figure 24. 18v to 13v change
lnbk20 typical application schematics 15/25 7 typical application schematics figure 25. two antenna ports receiver ja jb ant connectors 17v 24v mcu+v vcc1 1 vcc2 2 lnba 3 lnbb 15 gnd 8 llc 12 extm 11 osel 7 en 5 ent 9 vsel 4 olf 13 mi 14 cext 10 lnbp20cr c2 10uf r1 47k aux data c3 2x 0.1f c1 4.7f c4 c6 c5 2x 47nf tuner i/os mcu i/os vcc + figure 26. single antenna receiver with master receiver port 24v 17v mcu+v vcc1 1 vcc2 2 lnba 3 lnbb 15 gnd 8 llc 12 extm 11 osel 7 en 5 ent 9 vsel 4 olf 13 mi 14 cext 10 lnbp20cr c2 10uf aux data r1 47k tuner ant master c4 c5 47nf c3 2x 0.1f c1 4.7f i/os vcc mcu i/os +
typical application schematics lnbk20 16/25 figure 27. using serial bus to save mpu i/os vcc1 1 vcc2 2 lnba 3 lnbb 15 gnd 8 llc 12 extm 11 osel 7 en 5 ent 9 vsel 4 olf 13 mi 14 cext 10 lnbp20cr c2 10uf mcu+v r1 47k aux data str 1 d 2 clk 3 oe 15 q1 4 q2 5 q3 6 q4 7 q5 14 q6 13 q7 12 q8 11 qs 9 qs 10 4094 tuner ja jb ant connectors c4 c6 c5 2x 47nf c3 2x 0.1f c1 4.7f mcu+v serial bus mcu i/os vcc + 17v 24v figure 28. two antenna ports receiver - low cost solution ja jb ant connectors 17v 24v vcc1 1 vcc2 2 lnba 3 lnbb 10 gnd 6 cext 8 osel 9 en 5 ent 7 vsel 4 lnbp10sp c3 2x 0.1f c1 4.7f c4 c6 c5 2x 47nf tuner i/os mcu mcu+v i/os vcc +
lnbk20 typical application schematics 17/25 figure 29. connecting together v cc1 and v cc2 ja jb ant connectors 24v vcc1 1 vcc2 2 lnba 3 lnbb 10 gnd 6 cext 8 osel 9 en 5 ent 7 vsel 4 lnbp10sp c1 4.7f c6 c5 2x 47nf c4 0.1f tuner i/os mcu mcu+v i/os vcc + figure 30. single antenna receiver with master receiver port - low cost solution 24v 17v vcc1 1 vcc2 2 lnba 3 mi 10 gnd 6 cext 8 extm 9 en 5 ent 7 vsel 4 lnbp13sp c2 10f aux data tuner ant master c4 c5 47nf c3 2x 0.1f c1 4.7f mcu+v i/os vcc mcu i/os +
typical application schematics lnbk20 18/25 figure 31. single antenna receiver with overload diagnostic 24v 17v mcu+v c2 10f vcc1 1 vcc2 2 lnba 3 gnd 6 cext 8 extm 9 en 5 ent 7 vsel 4 olf 10 lnbp15sp aux data r1 47k tuner ant c4 c5 47nf c3 2x 0.1f c1 4.7f vcc i/os mcu i/os +
lnbk20 package mechanical data 19/25 8 package mechanical data in order to meet environmental requirements, st offers these devices in ecopack ? packages. these packages have a lead-free second level interconnect. the category of second level interconnect is marked on the package and on the inner box label, in compliance with jedec standard jesd97. the maximum ratings related to soldering conditions are also marked on the inner box label. ecopack is an st trademark. ecopack specifications are available at: www.st.com.
package mechanical data lnbk20 20/25 dim. mm. inch min. typ max. min. typ. max. a 3.60 0.1417 a1 0.10 0.30 0.0039 0.0118 a2 3.30 0.1299 a3 0 0.10 0 0.0039 b 0.40 0.53 0.0157 0.0209 c 0.23 0.32 0.0090 0.0013 d (1) 15.80 16.00 0.6220 0.630 e 13.90 14.50 0.5472 0.5710 e 1.27 0.0500 e3 11.43 0.4500 e1 (1) 10.90 11.10 0.4291 0.4370 e2 2.90 0.1141 e3 5.8 6.2 0.2283 0.2441 g 0 0.10 0.0000 0.0039 h 15.5 15.9 0.6102 0.6260 h 1.10 0.0433 l 0.80 1.10 0.0314 0.0433 n1010 s0 80 8 t 10.0 0.3937 powerso-20 mechanical data 0056635/i (1) ?d and e1? do not include mold flash or protusions - mold flash or protusions shall not exceed 0.15mm (0.006?)
lnbk20 package mechanical data 21/25 dim. mm. inch min. typ max. min. typ. max. a 2.35 2.65 0.093 0.104 a1 0.1 0.30 0.004 0.012 b 0.33 0.51 0.013 0.020 c 0.23 0.32 0.009 0.013 d 12.60 13.00 0.496 0.512 e 7.4 7.6 0.291 0.299 e 1.27 0.050 h 10.00 10.65 0.394 0.419 h 0.25 0.75 0.010 0.030 l 0.4 1.27 0.016 0.050 k0 80 8 ddd 0.100 0.004 so-20 mechanical data 0016022d
package mechanical data lnbk20 22/25 dim. mm. inch min. typ max. min. typ. max. a 330 12.992 c 12.8 13.2 0.504 0.519 d 20.2 0.795 n 60 2.362 t 30.4 1.197 ao 15.1 15.3 0.594 0.602 bo 16.5 16.7 0.650 0.658 ko 3.8 4.0 0.149 0.157 po 3.9 4.1 0.153 0.161 p 23.9 24.1 0.941 0.949 w 23.7 24.3 0.933 0.957 tape & reel powerso-20 mechanical data
lnbk20 package mechanical data 23/25 dim. mm. inch min. typ max. min. typ. max. a 330 12.992 c 12.8 13.2 0.504 0.519 d 20.2 0.795 n 60 2.362 t 30.4 1.197 ao 10.8 11 0.425 0.433 bo 13.2 13.4 0.520 0.528 ko 3.1 3.3 0.122 0.130 po 3.9 4.1 0.153 0.161 p 11.9 12.1 0.468 0.476 tape & reel so-20 mechanical data
revision history lnbk20 24/25 9 revision history table 7. revision history date revision changes 20-sep-2006 7 order codes has been updated and new template. 14-feb-2007 8 order codes has been updated.
lnbk20 25/25 please read carefully: information in this document is provided solely in connection with st products. stmicroelectronics nv and its subsidiaries (?st ?) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described he rein at any time, without notice. all st products are sold pursuant to st?s terms and conditions of sale. purchasers are solely responsible for the choice, selection and use of the st products and services described herein, and st as sumes no liability whatsoever relating to the choice, selection or use of the st products and services described herein. no license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. i f any part of this document refers to any third party products or services it shall not be deemed a license grant by st for the use of such third party products or services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoev er of such third party products or services or any intellectual property contained therein. unless otherwise set forth in st?s terms and conditions of sale st disclaims any express or implied warranty with respect to the use and/or sale of st products including without limitation implied warranties of merchantability, fitness for a particular purpose (and their equivalents under the laws of any jurisdiction), or infringement of any patent, copyright or other intellectual property right. unless expressly approved in writing by an authorized st representative, st products are not recommended, authorized or warranted for use in military, air craft, space, life saving, or life sustaining applications, nor in products or systems where failure or malfunction may result in personal injury, death, or severe property or environmental damage. st products which are not specified as "automotive grade" may only be used in automotive applications at user?s own risk. resale of st products with provisions different from the statements and/or technical features set forth in this document shall immediately void any warranty granted by st for the st product or service described herein and shall not create or extend in any manner whatsoev er, any liability of st. st and the st logo are trademarks or register ed trademarks of st in various countries. information in this document supersedes and replaces all information previously supplied. the st logo is a registered trademark of stmicroelectronics. all other names are the property of their respective owners. ? 2007 stmicroelectronics - all rights reserved stmicroelectronics group of companies australia - belgium - brazil - canada - china - czech republic - finland - france - germany - hong kong - india - israel - ital y - japan - malaysia - malta - morocco - singapore - spain - sweden - switzerland - united kingdom - united states of america www.st.com

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