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1/12 www.rohm.com 2012.03 - rev.c ? 2012 rohm co., ltd. all rights reserved. 78 series regulators 1a output 78 series regulators 500ma output 78 series regulators ba78 series,ba78m series description ba78 , ba78m series are three-terminal regulators available with several fixed output voltages. it supplies the stable fixes voltage from unstable direct input voltage. the useful output voltage lineup is 5v, 6v, 7v, 8v, 9v, 10v, 12v, 15v, 18v, 20v, 24v with 0.5a / 1a current ability. they have nearly sa me electric characteristics as competitor products and cover a wide range of application. features 1) built-in over-current protection circuit and thermal shutdown circuit 2) high ripple rejection 3) available to220cp-3, to252-3 package to a wide range application 4) compatible replacement to competitor products 5) various voltage lineup (5v, 6v, 7v, 8v, 9v, 10v, 12v, 15v, 18v, 20v, 24v) applications fixed voltage power supply for tv, audio components, etc line up 1a ba78 series part number 5v 6v 7v 8v 9v 10v 12v 15v 18v 20v 24v package ba78 cp to220cp-3 ba78 fp to252-3 0.5a ba78m series part number 5v 6v 7v 8v 9v 10v 12v 15v 18v 20v 24v package ba78m cp to220cp-3 ba78m fp to252-3 output voltage and marking part number ba78 (1a) part number ba78m (0.5a) symbol assignment of output voltage symbol assignment of output voltage a output voltage(v) output voltage(v) a output voltage(v) output voltage(v) 05 5.0v typ. 12 12v typ. 05 5.0v typ. 12 12v typ. 06 6.0v typ. 15 15v typ. 06 6.0v typ. 15 15v typ. 07 7.0v typ. 18 18v typ. 07 7.0v typ. 18 18v typ. 08 8.0v typ. 20 20v typ. 08 8.0v typ. 20 20v typ. 09 9.0v typ. 24 24v typ. 09 9.0v typ. 24 24v typ. 10 10.0v typ. 10 10.0v typ. b package b package cp to220cp-3 cp to220cp-3 fp to252-3 fp to252-3 no.12019ect01 b a b a
ba78 series,ba78m series technical note 2/12 www.rohm.com 2012.03 - rev.c ? 2012 rohm co., ltd. all rights reserved. absolute maxi mum rating (ta=25 ) ba78 cp/fp, ba78m cp/fp parameter symbol limits unit power supply voltage vin 35 v power dissipation 1 to220cp-3 pd1 2 * 1 w to252-3 1 * 1 power dissipation 2 to220cp-3 pd2 22 * 2 w to252-3 10 * 2 output current ba78 io 1 * 3 a ba78 m 0.5 * 3 operating temperature range topr -40 +85 storage temperature range tstg -55 +150 operating junction temperature range tj -40 +150 *1 derating in done 16mw/ (to220cp-3), 8mw/ (to252-3) for temperatures above ta=25 *2 derating in done 176mw/ (to220cp-3), 80mw/ (to252-3) for temperatures above ta=25 , mounted on infinity alminium heat sink. *3 pd,aso and tjmax(150 ) should not be exceeded. operating conditions (ta=25 , pd should not be exceeded) ba78 cp/fp ba78m cp/fp parameter symbol min. max. unit. parameter symbol min. max. unit. input voltage ba7805 vin 7.5 25 v input voltage ba78m05 vin 7.5 25 v ba7806 8.5 21 ba78m06 8.5 21 ba7807 9.5 22 ba78m07 9.5 22 ba7808 10.5 23 ba78m08 10.5 23 ba7809 11.5 26 ba78m09 11.5 26 ba7810 12.5 25 ba78m10 12.5 25 ba7812 14.5 27 ba78m12 14.5 27 ba7815 17.5 30 ba78m15 17.5 30 ba7818 21 33 ba78m18 21 33 ba7820 23 33 ba78m20 23 33 ba7824 27 33 ba78m24 27 33 output current io - 1 a output current io - 0.5 a
ba78 series,ba78m series technical note 3/12 www.rohm.com 2012.03 - rev.c ? 2012 rohm co., ltd. all rights reserved. electrical characteristics ba78m cp/fp (ta=25 ,vin=10v(05),11v(06),13v(07),14v(08),15v(09),16v(10),19v(12),23v(15),27v(18),29v(20),33v(24), io 350ma unless otherwise specified) parameter symbol type limit unit condition min typ max output voltage 1 vo1 05 4.8 5.0 5.2 v io=350ma 06 5.75 6.0 6.25 07 6.7 7.0 7.3 08 7.7 8.0 8.3 09 8.6 9.0 9.4 10 9.6 10.0 10.4 12 11.5 12.0 12.5 15 14.4 15.0 15.6 18 17.3 18.0 18.7 20 19.2 20.0 20.8 24 23.0 24.0 25.0 output voltage 2 vo2 05 4.75 - 5.25 v vin=7.5 20v, io=5ma 350ma 06 5.7 - 6.3 vin=8.5 21v, io=5ma 350ma 07 6.65 - 7.35 vin=9.5 22v, io=5ma 350ma 08 7.6 - 8.4 vin=10.5 23v, io=5ma 350ma 09 8.55 - 9.45 vin=11.5 24v, io=5ma 350ma 10 9.5 - 10.5 vin=12.5 25v, io=5ma 350ma 12 11.4 - 12.6 vin=15 27v, io=5ma 350ma 15 14.25 - 15.75 vin=17.5 30v, io=5ma 350ma 18 17.1 - 18.9 vin=21 33v, io=5ma 350ma 20 19.0 - 21.0 vin=23 33v, io=5ma 350ma 24 22.8 - 25.2 vin=27 33v, io=5ma 350ma line regulation 1 reg.i1 05 - 3 100 mv vin=7 25v, io=200ma 06 - 3 100 vin=8 25v, io=200ma 07 - 4 100 vin=9 25v, io=200ma 08 - 4 100 vin=10.5 25v, io=200ma 09 - 4 100 vin=11.5 26v, io=200ma 10 - 5 100 vin=12.5 28v, io=200ma 12 - 5 100 vin=14.5 30v, io=200ma 15 - 6 100 vin=17.5 30v, io=200ma 18 - 7 100 vin=21 33v, io=200ma 20 - 8 100 vin=23 33v, io=200ma 24 - 10 100 vin=27 33v, io=200ma line regulation 2 reg.i2 05 - 1 50 mv vin=8 12v, io=200ma 06 - 1 50 vin=9 25v, io=200ma 07 - 1 50 vin=10 25v, io=200ma 08 - 1 50 vin=11 25v, io=200ma 09 - 2 50 vin=12 25v, io=200ma 10 - 2 50 vin=14 26v, io=200ma 12 - 3 50 vin=16 30v, io=200ma 15 - 3 50 vin=20 30v, io=200ma 18 - 3 50 vin=24 33v, io=200ma 20 - 4 50 vin=24 33v, io=200ma 24 - 5 50 vin=28 33v, io=200ma ripple rejection r.r. 05 62 78 - db ein=1vrms, f=120hz, io=100ma 06 60 74 - 07 57 71 - 08 56 69 - 09 56 67 - 10 56 66 - 12 55 63 - 15 54 60 - 18 53 58 - 20 53 58 - 24 50 55 - temperature coefficient of output voltage tcvo 05 - -1.0 - mv/ io=5ma, tj=0 125 06/07/08/09/10/12 - -0.5 - 15/18 - -0.6 - 20/24 - -0.7 - peak output current io-p common - 875 - ma tj=25 dropout voltage vd common - 2.0 - v io=500ma
ba78 series,ba78m series technical note 4/12 www.rohm.com 2012.03 - rev.c ? 2012 rohm co., ltd. all rights reserved. electrical characteristics ba78m cp/fp (ta=25 ,vin=10v(05),11v(06),13v(07),14v(08),15v(09),16v (10),19v(12),23v(15),27v(18),29v(20),33v(24),io 350ma unless otherwise specified) parameter symbol type limit unit condition min typ max load regulation 1 reg.l1 05 - 20 100 mv io=5ma 500ma 06 - 20 120 07 - 20 140 08 - 20 160 09 - 20 180 10 - 20 200 12 - 20 240 15 - 20 300 18 - 20 360 20 - 20 400 24 - 20 480 load regulation 2 reg.l2 05 - 10 50 mv io=5ma 200ma 06 - 10 60 07 - 10 70 08 - 10 80 09 - 10 90 10 - 10 100 12 - 10 120 15 - 10 150 18 - 10 180 20 - 10 200 24 - 10 240 output noise voltage vn 05 - 40 - v f=10hz 100khz 06 - 60 - 07 - 70 - 08 - 80 - 09 - 90 - 10 - 100 - 12 - 110 - 15 - 130 - 18 - 140 - 20 - 150 - 24 - 170 - bias current ib common - 4.5 6.0 ma io=0ma bias current change1 ib1 common - - 0.5 ma io=5ma 350ma bias current change 2 ib2 05 - - 0.8 ma vin:8 25v, io=200ma 06 - - 0.8 vin:9 25v, io=200ma 07 - - 0.8 vin:10 25v, io=200ma 08 - - 0.8 vin:10.5 25v, io=200ma 09 - - 0.8 vin:12 25v, io=200ma 10 - - 0.8 vin:13 25v, io=200ma 12 - - 0.8 vin:14.5 30v, io=200ma 15 - - 0.8 vin:17.5 30v, io=200ma 18 - - 0.8 vin:21 33v, io=200ma 20 - - 0.8 vin:23 33v, io=200ma 24 - - 0.8 vin:27 33v, io=200ma short-circuit output current ios 05/06/07/08 - 0.4 - a vin=25v 09/10/12/15/18/20/24 - 0.17 - vin=30v output resistance ro 05 - 9 - m ? f=1khz 06 - 10 - 07 - 11 - 08 - 12 - 09 - 13 - 10 - 14 - 12 - 16 - 15 - 19 - 18 - 22 - 20 - 25 - 24 - 37 -
ba78 series,ba78m series technical note 5/12 www.rohm.com 2012.03 - rev.c ? 2012 rohm co., ltd. all rights reserved. electrical characteristics ba78 cp/fp (ta=25 ,vin=10v(05),11v(06),13v(07),14v(08),15v(09),16v(10),19v(12),23v (15),27v(18),29v(20),33v(24),io=500ma unless otherwise specifie d) parameter symbol type limit unit condition min typ max output voltage 1 vo1 05 4.8 5.0 5.2 v io=500ma 06 5.75 6.0 6.25 07 6.7 7.0 7.3 08 7.7 8.0 8.3 09 8.6 9.0 9.4 10 9.6 10.0 10.4 12 11.5 12.0 12.5 15 14.4 15.0 15.6 18 17.3 18.0 18.7 20 19.2 20.0 20.8 24 23.0 24.0 25.0 output voltage 2 vo2 05 4.75 - 5.25 v vin=7.5 20v, io=5ma 1a 06 5.7 - 6.3 vin=8.5 21v, io=5ma 1a 07 6.65 - 7.35 vin=9.5 22v, io=5ma 1a 08 7.6 - 8.4 vin=10.5 23v, io=5ma 1a 09 8.55 - 9.45 vin=11.5 26v, io=5ma 1a 10 9.5 - 10.5 vin=12.5 25v, io=5ma 1a 12 11.4 - 12.6 vin=15 27v, io=5ma 1a 15 14.25 - 15.75 vin=17.5 30v, io=5ma 1a 18 17.1 - 18.9 vin=21 33v, io=5ma 1a 20 19.0 - 21.0 vin=23 33v, io=5ma 1a 24 22.8 - 25.2 vin=27 33v, io=5ma 1a line regulation 1 reg.i1 05 - 3 100 mv vin=7 25v, io=500ma 06 - 4 120 vin=8 25v, io=500ma 07 - 5 140 vin=9 25v, io=500ma 08 - 5 160 vin=10.5 25v, io=500ma 09 - 6 180 vin=11.5 26v, io=500ma 10 - 7 200 vin=12.5 27v, io=500ma 12 - 8 240 vin=14.5 30v, io=500ma 15 - 9 300 vin=17.5 30v, io=500ma 18 - 10 360 vin=21 33v, io=500ma 20 - 12 400 vin=23 33v, io=500ma 24 - 15 480 vin=27 33v, io=500ma line regulation 2 reg.i2 05 - 1 50 mv vin=8 12v, io=500ma 06 - 2 60 vin=9 13v, io=500ma 07 - 2 70 vin=10 15v, io=500ma 08 - 3 80 vin=11 17v, io=500ma 09 - 4 90 vin=13 19v, io=500ma 10 - 4 100 vin=14 20v, io=500ma 12 - 5 120 vin=16 22v, io=500ma 15 - 5 150 vin=20 26v, io=500ma 18 - 5 180 vin=24 30v, io=500ma 20 - 7 200 vin=26 32v, io=500ma 24 - 10 240 vin=30 33v, io=500ma ripple rejection r.r. 05 62 78 - db ein=1vrms, f=120hz, io=100ma 06 59 73 - 07 57 69 - 08 56 65 - 09 56 64 - 10 55 64 - 12 55 63 - 15 54 62 - 18 53 61 - 20 53 60 - 24 50 58 - temperature coefficient of output voltage tcvo 05 - -1.0 - mv/ io=5ma, tj=0 125 06/07/08/09/10/12 - -0.5 - 15/18 - -0.6 - 20/24 - -0.7 - peak output current io-p common - 1.7 - a tj=25 dropout voltage vd common - 2.0 - v io=1a
ba78 series,ba78m series technical note 6/12 www.rohm.com 2012.03 - rev.c ? 2012 rohm co., ltd. all rights reserved. electrical characteristics ba78 cp/fp (ta=25 ,vin=10v(05),11v(06),13v(07),14v(08),15v(09),16v(10),19v(12),23v (15),27v(18),29v(20),33v(24),io=500ma unless otherwise specifi ed) parameter symbol type limit unit condition min typ max load regulation 1 reg.l1 05 - 15 100 mv io=5ma 1a 06 - 16 120 07 - 17 140 08 - 19 160 09 - 20 180 10 - 21 200 12 - 23 200 15 - 27 300 18 - 30 360 20 - 32 400 24 - 37 480 load regulation 2 reg.l2 05 - 5 50 mv io=250ma 750ma 06 - 6 60 07 - 6 70 08 - 7 80 09 - 8 90 10 - 8 90 12 - 10 100 15 - 10 150 18 - 12 180 20 - 14 200 24 - 15 240 output noise voltage vn 05 - 40 - v f=10hz 100khz 06 - 60 - 07 - 70 - 08 - 80 - 09 - 90 - 10 - 100 - 12 - 110 - 15 - 125 - 18 - 140 - 20 - 150 - 24 - 180 - bias current ib common - 4.5 8.0 ma io=0ma bias current change 1 ib1 common - - 0.5 ma io=5ma 1a bias current change 2 ib2 05 - - 0.8 ma vin:8 25v, io=500ma 06 - - 0.8 vin:8.5 25v, io=500ma 07 - - 0.8 vin:9.5 25v, io=500ma 08 - - 0.8 vin:10.5 25v, io=500ma 09 - - 0.8 vin:11.5 26v, io=500ma 10 - - 0.8 vin:12.5 27v, io=500ma 12 - - 0.8 vin:14.5 30v, io=500ma 15 - - 0.8 vin:17.5 30v, io=500ma 18 - - 0.8 vin:21 33v, io=500ma 20 - - 0.8 vin:23 33v, io=500ma 24 - - 0.8 vin:27 33v, io=500ma short-circuit output current ios 05/06/07/08 - 0.6 - a vin=25v 09/10/12/15/18/20/24 - 0.3 - vin=30v output resistance ro 05 - 9 - m ? f=1khz 06 10 - 07 10 - 08 10 - 09 - 10 - 10 - 11 - 12 - 12 - 15 - 14 - 18 - 17 - 20 - 19 - 24 - 27 -
ba78 series,ba78m series technical note 7/12 www.rohm.com 2012.03 - rev.c ? 2012 rohm co., ltd. all rights reserved. ba78m characteristics data (ta=25 , vin=10v(05), 14v(08), 23v(15) unless otherwise specified) ta = 2 5 io=0ma ba78m05 ba78m08 ba78m15 fig.4 vin - ib 0.0 0.5 1.0 1.5 2.0 0 5 10 15 20 25 30 vin [v] io-p [a] ta = 2 5 ba78m15 ba78m08 ba78m05 fig.6 peak output current 0 1 2 3 4 5 6 0 0.1 0.2 0.3 0.4 0.5 io [a] ib [ma] ta = 2 5 ba78m05 ba78m08 ba78m15 fi g .12 io - ib -1.5 -1.0 -0.5 0.0 0.5 1.0 1.5 -40-20 0 20406080100 ta [ ] S vo/vo [%] io=5ma ba78m15 ba78m08 ba78m05 fig.10 ta - vo ba78m05 ba78m08 ba78m15 fig.11 ta - ib 0 1 2 3 4 5 6 -40 -20 0 20 40 60 80 100 ta[ ] ib[ma] io=0ma ba78m05 ba78m08 ba78m15 0 5 10 15 20 0.0 0.5 1.0 1.5 2.0 io [a] vo [v] fig.5 load regulation ta = 2 5 ba78m05 ba78m08 ba78m15 0.0 0.2 0.4 0.6 0.8 1.0 0 5 10 15 20 25 30 vin [v] ios [a] ta = 2 5 ba78m05 ba78m08 ba78m15 fig.8 short ? circuit output current 0 5 10 15 20 0 5 10 15 20 25 30 vin [v] vo [v] ta = 2 5 io=350ma fig.2 line regulation (io=350ma) ba78m15 ba78m08 ba78m05 ta = 2 5 io=500ma 0 5 10 15 20 0 5 10 15 20 25 30 vin [v] vo [v] ba78m15 ba78m08 ba78m05 fig.3 line regulation(io=500ma) 0.0 0.5 1.0 1.5 2.0 0 0.1 0.2 0.3 0.4 0.5 io [a] vd [v] ta = 2 5 ba78m05 ba78m08 ba78m15 fig.7 dropout voltage 0 20 40 60 80 100 10 100 1000 10000 100000 1000000 fre q uenc y [ hz ] r.r. [db] ta = 2 5 io=100ma ba78m05 ba78m15 ba78m08 0 fig.9 ripple rejection ratio frequency hz ta = 2 5 io=500ma fig.1 line regulation (io=0ma) 0 5 10 15 20 0 5 10 15 20 25 30 vin [v] vo [v] ta = 2 5 io=0ma ba78m05 ba78m08 ba78m15 10 100 1k 10k 100k 1m 0 1 2 3 4 5 6 0 5 10 15 20 25 30 vi n [v] ib [ma] ta = 2 5 io=0ma ba78m05 ba78m08 ba78m15 fig.4 v in - io
ba78 series,ba78m series technical note 8/12 www.rohm.com 2012.03 - rev.c ? 2012 rohm co., ltd. all rights reserved. ba78 characteristics data (ta=25 , vin=10v(05), 14v(08), 23v(15) unless otherwise specified) io=0ma ba7805 ba7808 ba7815 fig.23 ta - ib 0 1 2 3 4 5 6 -40 -20 0 20 40 60 80 100 ta [ ] ib [ma] io=0ma ba7805 ba7808 ba7815 0 1 2 3 4 5 6 0 5 10 15 20 25 30 vin [v] ib [ma] ta = 2 5 io=0ma ba7805 ba7808 ba7815 fig.16 vin - ib 0 5 10 15 20 0.0 0.5 1.0 1.5 2.0 io [a] vo [v] ta = 2 5 ba7815 ba7808 ba7805 fig.17 load regulation 0.0 0.5 1.0 1.5 2.0 0 5 10 15 20 25 30 vin [v] io-p [a] fig.18 peak output current ta = 2 5 ba7815 ba7808 ba7805 0.0 0.5 1.0 1.5 2.0 0 0.2 0.4 0.6 0.8 1 io [a] vd [v] ta = 2 5 ba7805 ba7808 ba7815 fig.19 dropout voltage 0 0.5 1 1.5 2 0 5 10 15 20 25 30 vin [v] ios [a] ta = 2 5 ba7805 ba7808 ba7815 fig.20 short ? circuit output current 0 1 2 3 4 5 6 0 0.2 0.4 0.6 0.8 1 io [a] ib [ma] ta = 2 5 ba7815 ba7808 ba7805 fig.24 io - ib -1.5 -1.0 -0.5 0.0 0.5 1.0 1.5 -40-20 0 20406080100 ta [ ] vo/vo [%] io=5ma ba7815 ba7808 ba7805 fig.22 ta - vo fig.13 line regulation (io=0ma) 0 5 10 15 20 0 5 10 15 20 25 30 vin [v] vo [v] ta = 2 5 io=0ma ba7805 ba7808 ba7815 fig.14 line regulation (io=500ma) 0 5 10 15 20 0 5 10 15 20 25 30 vin [v] vo [v] ta = 2 5 io=500ma ba7805 ba7808 ba7815 fig15. line regulation (io=1a) 0 5 10 15 20 0 5 10 15 20 25 30 vin [v] vo [v] ta = 2 5 io=1a ba7815 ba7805 ba7808 0 20 40 60 80 100 10 100 1000 10000 100000 1000000 frequency [hz] r.r. [db] ta = 2 5 io=100ma ba7805 ba7815 ba7808 1 0 1 00 1k 1 0 k 1 00 k 1m fig.21 ripple rejection ratio 0
ba78 series,ba78m series technical note 9/12 www.rohm.com 2012.03 - rev.c ? 2012 rohm co., ltd. all rights reserved. internal circuit structural diagram to220cp-3 to252-3 pin no. symbol function pin no. symbol function 1 input input terminal 1 input input terminal 2 common ground terminal 2 n.c. non connection terminal 3 output output terminal 3 output output terminal fin common ground terminal protection circuit (1)over-current protection circuit (2) thermal shutdown circuit (3) safety operation area control circuit q5 r4 r10 r5 r6 r7 r8 q8 r9 q9 r13 q17 q16 q15 q13 q10 q6 q18 q14 q1 q7 q2 r21 r17 r20 r12 r19 q11 q3 r14 r3 r18 r1 r15 r11 c1 d2 d1 q12 r2 d3 input output common r22 q4 r16 fin 12 3 when the chip temperature of ic exceeds the setting temperature, the ic goes off, and it controls the ic not to be destroyed by the heat generation. it can be restored by being lowered the chip temperature of ic below the setting temperature. it controls the output current in inverse proportion ratio to voltage difference (input-output). when voltage difference becomes bigger, the ic will be destroyed in rush current. it protects the ic by controlling the curr ent ability according to the voltage level. when the maximum rating current or mo re is rushed, it controls the current ability and protects the ic from destruction. 6 chip junction temperature : tj [ ] 175 50 25 vin=10v ba7805cp output voltage : vo [v] 75 100 125 150 200 5 4 3 2 1 0 2 1 vin=10v ba7805cp output voltage : vo [v] 6 5 4 3 2 1 0 output current : i o [a] input-output voltage difference: vin-vo [v] 30 20 maximum output current : i o-p [a] 40 2 0 10 1.5 1 0.5 tj=25 ba7805cp
ba78 series,ba78m series technical note 10/12 www.rohm.com 2012.03 - rev.c ? 2012 rohm co., ltd. all rights reserved. thermal design refer to the following thermal derating curves (f ig. 25, 26), when using in the status of ta=25 or more. the characteristic of ic is greatly related to the operating temperature. when it is used in over maximum junction temperature, t he elements inside ic might become weaker and be destroyed. it is recommended to take into consideration thermal of ic. note that the temperatures ar e in the allowed temperature limits and operated within pd. it is necessary to operate it at junction temperature tjma x or less to prevent ic from the thermal destruction. please operate ic within permissible loss pd because the junction temperature tj might become considerably a high temperature even if ambient temperat ure ta is normal temperature (25 ). power consumption pc(w) may be expressed by the equation shown below: pc=(vin-vo) io+ vin i permissible loss pd Rpc maximum output current io max can be calculated in thermal design. ? calculation example ex.1) ta = 8 5 , vin =7.5v, vo=5.0v io Q400a be sure to use this ic within a power dissi pation at the range of operating temperature. fig.25 thermal derating curve (to220cp-3) fig.26 thermal derating curve (to252-3) terminal setting and cautions ? input it is recommended that a capacitor (about 0.33uf) be inserted between input and common. the value of capacitor is designed su itable for the actual application. ? output it is recommended that a capacitor (about 0. 1uf) be inserted between output and common. a tantalum capacitor can also be used for this pin because in sufficient capacitors may cause oscillation by a temperature change. ?common keep the no voltage drop between ground level of set board and ic. when there is the voltage difference, setting voltage becomes inaccuracy and unstable. it is recommended to connect by wide, short pattern, and lower the inpedance. vovin ibvinpd io ? ?? Q 5.07.5 4.5m7.51.04 io ? ?? Q vin : input voltage vo : output voltage io : output current ib : bias current using to220cp-3 alone ba78 series,ba78m series technical note 11/12 www.rohm.com 2012.03 - rev.c ? 2012 rohm co., ltd. all rights reserved. notes for use (1) absolute maximum ratings while utmost care is taken to quality control of this product, any application that may exceed some of the absolute maximum ratings including the voltage applied and the operating temperature range may result in breakage. if broken, short-mode or open-mode may not be identified. so if it is expected to encounter with special mode that may exceed the absolute maximum ratings, it is requested to take necessary sa fety measures physically including insertion of fuses. (2) ground voltage make setting of the potential of the gnd terminal so that it will be maintained at the minimum in any operating state. furthermore, check to be sure no terminals are at a potential lower than the gnd voltage including an actual electric transient . (3) thermal design when you do the kind of use which exceeds pd, it may be happened to deteriorating ic original quality such as decrease of electric current ability with chip temperature rise. do not exceed the power dissipation (p d) of the package specification rating under actual operation, and please design enough temperature margins. (4) short-circuiting between terminals, and mismounting when mounting to pc board, care must be taken to avoid mistake in its orientation and alignment. failure to do so may result in ic breakdown. short-circuiting due to foreign matters entered between output terminals, or between output and power supply or gnd may also cause breakdown. (5) operation in strong electromagnetic field be noted that using the ic in the strong electromagnetic radiation can cause operation failures. (6) inspection with the ic set to a pc board if a capacitor must be connected to the pin of lower impedance during inspection with the ic set to a pc board, the capacitor must be discharged after each process to avoid stress to the ic. for electrostatic protection, provide proper grounding to assembling processes with special care taken in handling and storage. when connecting to jigs in the inspection process, be sure to turn off the power supply before it is connected and removed. (7) input to ic terminals this is a monolithic ic with p + isolation between p-substrate and each element as illustrated below. this p-layer and the n-layer of each element form a p-n junction, and various parasitic element are formed. if a resistor is joined to a transistor terminal as shown in fig 28. p-n junction works as a parasitic diode if the following relationship is satisfied; gnd>terminal a (at resistor side), or g nd>terminal b (at transistor side); and if gnd>terminal b (at npn transistor side), a parasitic npn transistor is activated by n-layer of other element adjacent to the above-mentioned parasitic diode. the structure of the ic inevitably forms parasitic elements, the activation of which may cause interference among circuits, and/or malfunctions contributing to breakdown. it is therefore requested to take care not to use the device in such manner that the voltage lower than gnd (at p-substrate) may be applied to the input terminal, which may result in activation of parasitic elements. (8) ground wiring pattern if small-signal gnd and large-current g nd are provided, it will be recommended to separate the large-current gnd pattern from the small-signal gnd pattern and establish a si ngle ground at the reference point of the set pcb so that resistance to the wiring pattern and voltage fluctuations due to a large current will cause no fluctuations in voltages of the small-signal gnd. pay attention not to cause fluctuations in the gnd wiring pattern of external parts as well. (9) thermal shutdown circuit a temperature control circuit is built in the ic to prevent the damage due to overheat.therefore, the output is turned off when the thermal circuit works and is turned on when the temperature goes down to the specified level. but, built-in the ic a temperature control circuit to protect itself, and avoid the design used the thermal protection. (10) over current protection circuit the over-current protection circuits are built in at output, a ccording to their respective current outputs and prevent the ic from being damaged when the load is short-circuited or ove r-current. but, these protection circuits are effective for preventing destruction by unexpected accident. when it?s in continuous protection circuit moving period don?t use please. and for ability, because this chip has minus characteristic, be careful for heat plan. (11) there is a possibility to damage an internal circuit or the element when vin and the voltage of each terminal reverse in t he application. for instance, vin is short-circuited to gnd etc. with the charge charged to an external capacitor. please use the capacitor of the output terminal with 1000 f or less. moreover, the vin series is recommended to insert the diode of the by-pass the diode of the backflow prevention or between each terminal and vin. fig.27 bypass diode fig.28 simplified structure of monorisic ic vcc output terminal bypass diode backflow prevention diode p substrate pin a p aras iti c element resistor n n n p + p + p gnd parasitic element pin a p substrate transistor (npn) n n p + p + p gnd parasitic element pin b c b e n gnd pin b other adjacent elements e b c gnd p aras iti c element
ba78 series,ba78m series technical note 12/12 www.rohm.com 2012.03 - rev.c ? 2012 rohm co., ltd. all rights reserved. ordering part number b a 7 8 m 0 5 f p - e 2 part no part no output current none 1a m 0.5a output voltage 05 : 5v 24 : 24v package cp :to220cp-3 fp :to252-3 packaging and forming specification e2: embossed tape and reel (to220cp-3, to252-3) (unit : mm) to220cp-3 12 3 10.0 +0.3 - 0.1 3.20.1 0.820.1 (0.585) 1.3 2.54 2.46 2.8 +0.2 - 0.1 +0.4 - 0.2 15.2 5.610.2 12.00.2 1.00.2 8.00.2 4.50.1 2.85 0.420.1 23 1 direction of feed 1pin reel ? order quantity needs to be multiple of the minimum quantity. embossed carrier tape tape quantity direction of feed the direction is the 1pin of product is at the lower left when you hold reel on the left hand and you pull out the tape on the right hand 500pcs e2 () (unit : mm) to252-3 21 3 0.8 0.65 0.65 1.5 2.5 0.75 fin 6.50.2 2.30.2 2.30.2 0.50.1 1.00.2 2.30.2 9.50.5 0.50.1 5.5 0.2 1.50.2 5.1 +0.2 - 0.1 c0.5 direction of feed 1pin reel ? order quantity needs to be multiple of the minimum quantity. embossed carrier tape tape quantity direction of feed the direction is the 1pin of product is at the lower left when you hold reel on the left hand and you pull out the tape on the right hand 2000pcs e2 ( )
r1120 a www.rohm.com ? 2012 rohm co., ltd. all rights reserved. notice rohm customer support system http://www.rohm.com/contact/ thank you for your accessing to rohm product informations. more detail product informations and catalogs are available, please contact us. notes no copying or reproduction of this document, in part or in whole, is permitted without the consent of rohm co.,ltd. the content specified herein is subject to change for improvement without notice. the content specified herein is for the purpose of introducing rohm's products (hereinafter "products"). if you wish to use any such product, please be sure to refer to the specifications, which can be obtained from rohm upon request. examples of application circuits, circuit constants and any other information contained herein illustrate the standard usage and operations of the products. the peripheral conditions must be taken into account when designing circuits for mass production. great care was taken in ensuring the accuracy of the information specified in this document. however, should you incur any damage arising from any inaccuracy or misprint of such information, rohm shall bear no responsibility for such damage. the technical information specified herein is intended only to show the typical functions of and examples of application circuits for the produc ts. rohm does not grant you, explicitly or implicitly, any license to use or exercise intellectual property or other rights held by rohm and other parties. rohm shall bear no responsibility whatsoever for any dispute arising from the use of such technical information. the products specified in this document are intended to be used with general-use electronic equipment or devices (such as audio visual equipment, office-automation equipment, commu- nication devices, electronic appliances and amusement devices). the products specified in this document are not designed to be radiation tolerant. while rohm always makes efforts to enhance the quality and reliability of its products, a product may fail or malfunction for a variety of reasons. please be sure to implement in your equipment using the products safety measures to guard against the possibility of physical injury, fire or any other damage caused in the event of the failure of any product, such as derating, redundancy, fire control and fail-safe designs. rohm shall bear no responsibility whatsoever for your use of any product outside of the prescribed scope or not in accordance with the instruction manual. the products are not designed or manufactured to be used with any equipment, device or system which requires an extremely high level of reliability the failure or malfunction of which may result in a direct threat to human life or create a risk of human injury (such as a medical instrument, transportation equipment, aerospace machinery, nuclear-reactor controller, fuel- controller or other safety device). rohm shall bear no responsibility in any way for use of any of the products for the above special purposes. if a product is intended to be used for any such special purpose, please contact a rohm sales representative before purchasing. if you intend to export or ship overseas any product or technology specified herein that may be controlled under the foreign exchange and the foreign trade law, you will be required to obtain a license or permit under the law.

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