voltage regulators 1 an78xx/AN78XXF series 3-pin positive output voltage regulator (1 a type) overview the an78xx series and the AN78XXF series are 3- pin, fixed positive output type monolithic voltage regu- lators. stabilized fixed output voltage is obtained from unstable dc input voltage without using any external components. 11 types of fixed output voltage are avail- able; 5v, 6v, 7v, 8v, 9v, 10v, 12v, 15v, 18v, 20v, and 24v. they can be used widely in power circuits with cur- rent capacity of up to 1a. features ? no external components ? output voltage: 5v, 6v, 7v, 8v, 9v, 10v, 12v, 15v, 18v, 20v, 24v ? built-in overcurrent limit circuit ? built-in thermal overload protection circuit ? built-in aso (area of safe operation) protection circuit hsip003-p-0000 an78xx series unit: mm hsip003-p-0000a AN78XXF series unit: mm 1 3 2 input pass tr output common starter voltage reference current source error amp. + ? thermal protection q 1 r sc r 2 r 1 current limiter block diagram 2.54 2.54 0.8 (2.0) (2.5) 10.50.3 +0.15 ?0.05 1.4 +0.15 ?0.05 0.45 +0.2 ?0.0 (4.5) 8.70.2 15.40.2 12.50.2 17.00.2 26.10.2 29.00.3 (13.6) (10.35) 4.50.2 10.00.3 1.40.1 3.70.1 2.90.1 3.10 0.10 (0.40) (4.30) 5.30 10.50 0.30 16.70 0.30 4.50 0.25 13.60 0.25 2.54 2 13 0.80 0.20 1.40 0.20 (1.73) 2.77 0.30 3.80 0.25 17.00 0.25 8.70 0.30 2.00 0.25 2.50 0.25 0.40 +0.10 ? 0.05 4.50 0.30 4.20 0.25 1: input 2: common 3: output 1: input 2: common 3: output
an78xx/AN78XXF series voltage regulators 2 absolute maximum ratings at t a = 25 c v i p d t opr t stg v v w c c parameter symbol rating unit 35 * 1 40 * 2 15 * 3 10.25 * 3 ? 30 to + 80 ? 55 to + 150 input voltage power dissipation operating ambient temperature storage temperature an78xx series AN78XXF series * 1 an7805/f, an7806/f, an7807/f, an7808/f, an7809/f, an7810/f, an7812/f, an7815/f, an7818/f * 2 an7820/f, an7824/f * 3 follow the derating curve. when t j exceeds 150 c, the internal circuit cuts off the output. electrical characteristics at t a = 25 c ? an7805, an7805f (5v type) parameter symbol conditions min typ max output voltage v o 5.2 v 5 t j = 25 c output voltage tolerance v o v v i = 8 to 20v, i o = 5ma to 1a, t j = 0 to 125 c, p d * line regulation reg in 100 mv 3 v i = 7.5 to 25 v, t j = 25 c mv load regulation reg l mv 15 i o = 5ma to 1.5a, t j = 25 c mv i o = 250 to 750ma, t j = 25 c v i = 8 to 12v, t j = 25 c ma 3.9 t j = 25 c note 1) the specified condition t j = 25 c means that the test should be carried out within so short a test time (within 10ms) that the characteristic value drift due to the chip junction temperature rise can be ignored. note 2) unless otherwise specified, v i = 10v, i o = 500ma, c i = 0.33 f and c o = 0.1 f. * an78xx series: 15w, AN78XXF series: 10.25w 1 bias current i bias ma v i = 7.5 to 25v, t j = 25 c bias current fluctuation to input ? i bias(in) ma bias current fluctuation to load ? i bias(l) v 40 i o = 5ma to 1a, t j = 25 c output noise voltage v no db f = 10hz to 100khz 1.3 0.5 50 5.25 100 50 8 62 4.8 4.75 ripple rejection ratio rr v i = 8 to 18v, i o = 100ma, f = 120hz v 2 i o = 1a, t j = 25 c minimum input/output voltage difference v dif(min) m ? 17 output impedance z o ma 700 f = 1khz output short-circuit current i o(short) a 2 v i = 25v, t j = 25 c 5 peak output current i o(peak) t j = 25 c mv/ c ? 0.3 output voltage temperature coefficient ? v o /t a i o = 5ma, t j = 0 to 125 c unit
voltage regulators an78xx/AN78XXF series 3 electrical characteristics at t a = 25 c (continued) ? an7806, 7806f (6v type) ? an7807, 7807f (7v type) v o 6.25 v 6 t j = 25 c v o v v i = 9 to 21v, i o = 5ma to 1a, t j = 0 to 125 c, p d * reg in 120 mv 5 v i = 8.5 to 25v, t j = 25 c mv reg l mv 14 i o = 5ma to 1.5a, t j = 25 c mv i o = 250 to 750ma, t j = 25 c v i = 9 to 13v, t j = 25 c ma 3.9 t j = 25 c 1.5 i bias ma v i = 8.5 to 25v, t j = 25 c ? i bias(in) ma ? i bias(l) v 40 i o = 5ma to 1a, t j = 25 c v no db f = 10hz to 100khz 1.3 0.5 60 6.3 120 60 8 59 5.75 5.7 rr v i = 9 to 19v, i o = 100ma, f = 120hz v 2 i o = 1a, t j = 25 c v dif(min) m ? 17 z o ma 700 f = 1khz i o(short) a 2 v i = 25v, t j = 25 c 4 i o(peak) t j = 25 c mv/ c ? 0.4 ? v o /t a i o = 5ma, t j = 0 to 125 c parameter symbol conditions min typ max output voltage output voltage tolerance line regulation load regulation bias current bias current fluctuation to input bias current fluctuation to load output noise voltage ripple rejection ratio minimum input/output voltage difference output impedance output short-circuit current peak output current output voltage temperature coefficient unit note 1) the specified condition t j = 25 c means that the test should be carried out within so short a test time (within 10ms) that the characteristic value drift due to the chip junction temperature rise can be ignored. note 2) unless otherwise specified, v i = 11v, i o = 500ma, c i = 0.33 f and c o = 0.1 f. * an78xx series: 15w, AN78XXF series: 10.25w v o 7.3 v 7 t j = 25 c v o v v i = 10 to 22v, i o = 5ma to 1a, t j = 0 to 125 c, p d * reg in 140 mv 5 v i = 9.5 to 25v, t j = 25 c mv reg l mv 14 i o = 5ma to 1.5a, t j = 25 c mv i o = 250 to 750ma, t j = 25 c v i = 10 to 15v, t j = 25 c ma 3.9 t j = 25 c 1.5 i bias ma v i = 9.5 to 25v, t j = 25 c ? i bias(in) ma ? i bias(l) v 46 i o = 5ma to 1a, t j = 25 c v no db f = 10hz to 100khz 1 0.5 70 7.4 140 70 8 57 6.7 6.6 rr v i = 10 to 20v, i o = 100ma, f = 120hz v 2 i o = 1a, t j = 25 c v dif(min) m ? 16 z o ma 700 f = 1khz i o(short) a 2 v i = 25v, t j = 25 c 4 i o(peak) t j = 25 c mv/ c ? 0.5 ? v o /t a i o = 5ma, t j = 0 to 125 c parameter symbol conditions min typ max output voltage output voltage tolerance line regulation load regulation bias current bias current fluctuation to input bias current fluctuation to load output noise voltage ripple rejection ratio minimum input/output voltage difference output impedance output short-circuit current peak output current output voltage temperature coefficient unit note 1) the specified condition t j = 25 c means that the test should be carried out within so short a test time (within 10ms) that the characteristic value drift due to the chip junction temperature rise can be ignored. note 2) unless otherwise specified, v i = 12v, i o = 500ma, c i = 0.33 f and c o = 0.1 f. * an78xx series: 15w, AN78XXF series: 10.25w
an78xx/AN78XXF series voltage regulators 4 electrical characteristics at t a = 25 c (continued) ? an7808, 7808f (8v type) ? an7809, 7809f (9v type) v o 8.3 v 8 t j = 25 c v o v v i = 11 to 23v, i o = 5ma to 1a, t j = 0 to 125 c, p d * reg in 160 mv 6 v i = 10.5 to 25v, t j = 25 c mv reg l mv 12 i o = 5ma to 1.5a, t j = 25 c mv i o = 250 to 750ma, t j = 25 c v i = 11 to 17v, t j = 25 c ma 3.9 t j = 25 c 2 i bias ma v i = 10.5 to 25v, t j = 25 c ? i bias(in) ma ? i bias(l) v 52 i o = 5ma to 1a, t j = 25 c v no db f = 10hz to 100khz 1 0.5 80 8.4 160 80 8 56 7.7 7.6 rr v i = 11.5 to 21.5v, i o = 100ma, f = 120hz v 2 i o = 1a, t j = 25 c v dif(min) m ? 16 z o ma 700 f = 1khz i o(short) a 2 v i = 25v, t j = 25 c 4 i o(peak) t j = 25 c mv/ c ? 0.5 ? v o /t a i o = 5ma, t j = 0 to 125 c parameter symbol conditions min typ max output voltage output voltage tolerance line regulation load regulation bias current bias current fluctuation to input bias current fluctuation to load output noise voltage ripple rejection ratio minimum input/output voltage difference output impedance output short-circuit current peak output current output voltage temperature coefficient unit note 1) the specified condition t j = 25 c means that the test should be carried out within so short a test time (within 10ms) that the characteristic value drift due to the chip junction temperature rise can be ignored. note 2) unless otherwise specified, v i = 14v, i o = 500ma, c i = 0.33 f and c o = 0.1 f. * an78xx series: 15w, AN78XXF series: 10.25w v o v v o v reg in mv mv reg l mv mv ma i bias ma ? i bias(in) ma ? i bias(l) v v no db rr v v dif(min) m ? z o ma i o(short) a i o(peak) mv/ c ? v o /t a 9.35 9 t j = 25 c v i = 12 to 24v, i o = 5ma to 1a, t j = 0 to 125 c, p d * 180 7 v i = 11.5 to 26v, t j = 25 c 12 i o = 5ma to 1.5a, t j = 25 c i o = 250 to 750ma, t j = 25 c v i = 12 to 18v, t j = 25 c 3.9 t j = 25 c 2 v i = 11.5 to 26v, t j = 25 c 57 i o = 5ma to 1a, t j = 25 c f = 10hz to 100khz 1 0.5 90 9.45 180 90 8 56 8.65 8.55 v i = 12 to 22v, i o = 100ma, f = 120hz 2 i o = 1a, t j = 25 c 16 700 f = 1khz 2 v i = 26v, t j = 25 c 4 t j = 25 c ? 0.5 i o = 5ma, t j = 0 to 125 c parameter symbol conditions min typ max output voltage output voltage tolerance line regulation load regulation bias current bias current fluctuation to input bias current fluctuation to load output noise voltage ripple rejection ratio minimum input/output voltage difference output impedance output short-circuit current peak output current output voltage temperature coefficient unit note 1) the specified condition t j = 25 c means that the test should be carried out within so short a test time (within 10ms) that the characteristic value drift due to the chip junction temperature rise can be ignored. note 2) unless otherwise specified, v i = 15v, i o = 500ma, c i = 0.33 f and c o = 0.1 f. * an78xx series: 15w, AN78XXF series: 10.25w
voltage regulators an78xx/AN78XXF series 5 electrical characteristics at t a = 25 c (continued) ? an7810, 7810f (10v type) ? an7812, 7812f (12v type) v o v v o v reg in mv mv reg l mv mv ma i bias ma ? i bias(in) ma ? i bias(l) v v no db rr v v dif(min) m ? z o ma i o(short) a i o(peak) mv/ c ? v o /t a 10.4 10 t j = 25 c v i = 13 to 25v, i o = 5ma to 1a, t j = 0 to 125 c, p d * 200 8 v i = 12.5 to 27v, t j = 25 c 12 i o = 5ma to 1.5a, t j = 25 c i o = 250 to 750ma, t j = 25 c v i = 13 to 19v, t j = 25 c 3.9 t j = 25 c 2.5 v i = 12.5 to 27v, t j = 25 c 63 i o = 5ma to 1a, t j = 25 c f = 10hz to 100khz 1 0.5 100 10.5 200 100 8 56 9.6 9.5 v i = 13 to 23v, i o = 100ma, f = 120hz 2 i o = 1a, t j = 25 c 16 700 f = 1khz 2 v i = 27v, t j = 25 c 4 t j = 25 c ? 0.6 i o = 5ma, t j = 0 to 125 c parameter symbol conditions min typ max output voltage output voltage tolerance line regulation load regulation bias current bias current fluctuation to input bias current fluctuation to load output noise voltage ripple rejection ratio minimum input/output voltage difference output impedance output short-circuit current peak output current output voltage temperature coefficient unit note 1) the specified condition t j = 25 c means that the test should be carried out within so short a test time (within 10ms) that the characteristic value drift due to the chip junction temperature rise can be ignored. note 2) unless otherwise specified, v i = 16v, i o = 500ma, c i = 0.33 f and c o = 0.1 f. * an78xx series: 15w, AN78XXF series: 10.25w v o v v o v reg in mv mv reg l mv mv ma i bias ma ? i bias(in) ma ? i bias(l) v v no db rr v v dif(min) m ? z o ma i o(short) a i o(peak) mv/ c ? v o /t a 12.5 12 t j = 25 c v i = 15 to 27v, i o = 5ma to 1a, t j = 0 to 125 c, p d * 240 10 v i = 14.5 to 30v, t j = 25 c 12 i o = 5ma to 1.5a, t j = 25 c i o = 250 to 750ma, t j = 25 c v i = 16 to 22v, t j = 25 c 4 t j = 25 c 3 v i = 14.5 to 30v, t j = 25 c 75 i o = 5ma to 1a, t j = 25 c f = 10hz to 100khz 1 0.5 120 12.6 240 120 8 55 11.5 11.4 v i = 15 to 25v, i o = 100ma, f = 120hz 2 i o = 1a, t j = 25 c 18 700 f = 1khz 2 v i = 30v, t j = 25 c 4 t j = 25 c ? 0.8 i o = 5ma, t j = 0 to 125 c parameter symbol conditions min typ max output voltage output voltage tolerance line regulation load regulation bias current bias current fluctuation to input bias current fluctuation to load output noise voltage ripple rejection ratio minimum input/output voltage difference output impedance output short-circuit current peak output current output voltage temperature coefficient unit note 1) the specified condition t j = 25 c means that the test should be carried out within so short a test time (within 10ms) that the characteristic value drift due to the chip junction temperature rise can be ignored. note 2) unless otherwise specified, v i = 19v, i o = 500ma, c i = 0.33 f and c o = 0.1 f. * an78xx series: 15w, AN78XXF series: 10.25w
an78xx/AN78XXF series voltage regulators 6 electrical characteristics at t a = 25 c (continued) ? an7815, 7815f (15v type) v v mv mv mv mv ma ma ma v db v m ? ma a mv/ c 15.6 15 t j = 25 c v i = 18 to 30v, i o = 5ma to 1a, t j = 0 to 125 c, p d * 300 11 v i = 17.5 to 30v, t j = 25 c 12 i o = 5ma to 1.5a, t j = 25 c i o = 250 to 750ma, t j = 25 c v i = 20 to 26v, t j = 25 c 4 t j = 25 c 3 v i = 17.5 to 30v, t j = 25 c 90 i o = 5ma to 1a, t j = 25 c f = 10hz to 100khz 0.5 150 15.75 300 150 8 1 54 14.4 14.25 v i = 18.5 to 28.5v, f = 120hz 2 i o = 1a, t j = 25 c 19 700 f = 1khz 2 v i = 30v, t j = 25 c 4 t j = 25 c ? 1 i o = 5ma, t j = 0 to 125 c parameter symbol conditions min typ max output voltage output voltage tolerance line regulation load regulation bias current bias current fluctuation to input bias current fluctuation to load output noise voltage ripple rejection ratio minimum input/output voltage difference output impedance output short-circuit current peak output current output voltage temperature coefficient unit v o v o reg in reg l i bias ? i bias(in) ? i bias(l) v no rr v dif(min) z o i o(short) i o(peak) ? v o /t a note 1) the specified condition t j = 25 c means that the test should be carried out within so short a test time (within 10ms) that the characteristic value drift due to the chip junction temperature rise can be ignored. note 2) unless otherwise specified, v i = 23v, i o = 500ma, c i = 0.33 f and c o = 0.1 f. * an78xx series: 15w, AN78XXF series: 10.25w ? an7818, 7818f (18v type) v o v v o v reg in mv mv reg l mv mv ma i bias ma ? i bias(in) ma ? i bias(l) v v no db rr v v dif(min) m ? z o ma i o(short) a i o(peak) mv/ c ? v o /t a 18.7 18 t j = 25 c v i = 21 to 33v, i o = 5ma to 1a, t j = 0 to 125 c, p d * 360 14 v i = 21 to 33v, t j = 25 c 12 i o = 5ma to 1.5a, t j = 25 c i o = 250 to 750ma, t j = 25 c v i = 24 to 30v, t j = 25 c 4.1 t j = 25 c 4 v i = 21 to 33v, t j = 25 c 110 i o = 5ma to 1a, t j = 25 c f = 10hz to 100khz 1 0.5 180 18.9 360 180 8 53 17.3 17.1 v i = 22 to 32v, i o = 100ma, f = 120hz 2 i o = 1a, t j = 25 c 16 700 f = 1khz 2 v i = 35v, t j = 25 c 4 t j = 25 c ? 1.1 i o = 5ma, t j = 0 to 125 c parameter symbol conditions min typ max output voltage output voltage tolerance line regulation load regulation bias current bias current fluctuation to input bias current fluctuation to load output noise voltage ripple rejection ratio minimum input/output voltage difference output impedance output short-circuit current peak output current output voltage temperature coefficient unit note 1) the specified condition t j = 25 c means that the test should be carried out within so short a test time (within 10ms) that the characteristic value drift due to the chip junction temperature rise can be ignored. note 2) unless otherwise specified, v i = 27v, i o = 500ma, c i = 0.33 f and c o = 0.1 f. * an78xx series: 15w, AN78XXF series: 10.25w
voltage regulators an78xx/AN78XXF series 7 electrical characteristics at t a = 25 c (continued) ? an7820, 7820f (20v type) ? an7824, 7824f (24v type) v o v v o v reg in mv mv reg l mv mv ma i bias ma ? i bias(in) ma ? i bias(l) v v no db rr v v dif(min) m ? z o ma i o(short) a i o(peak) mv/ c ? v o /t a 20.8 20 t j = 25 c v i = 24 to 35v, i o = 5ma to 1a, t j = 0 to 125 c, p d * 400 15 v i = 23 to 35v, t j = 25 c 12 i o = 5ma to 1.5a, t j = 25 c i o = 250 to 750ma, t j = 25 c v i = 26 to 32v, t j = 25 c 4.1 t j = 25 c 5 v i = 23 to 35v, t j = 25 c 110 i o = 5ma to 1a, t j = 25 c f = 10hz to 100khz 1 0.5 200 21 400 200 8 53 19.2 19 v i = 24 to 34v, i o = 100ma, f = 120hz 2 i o = 1a, t j = 25 c 22 700 f = 1khz 2 v i = 35v, t j = 25 c 4 t j = 25 c ? 1.2 i o = 5ma, t j = 0 to 125 c parameter symbol conditions min typ max output voltage output voltage tolerance line regulation load regulation bias current bias current fluctuation to input bias current fluctuation to load output noise voltage ripple rejection ratio minimum input/output voltage difference output impedance output short-circuit current peak output current output voltage temperature coefficient unit note 1) the specified condition t j = 25 c means that the test should be carried out within so short a test time (within 10ms) that the characteristic value drift due to the chip junction temperature rise can be ignored. note 2) unless otherwise specified, v i = 29v, i o = 500ma, c i = 0.33 f and c o = 0.1 f. * an78xx series: 15w, AN78XXF series: 10.25w v o v v o v reg in mv mv reg l mv mv ma i bias ma ? i bias(in) ma ? i bias(l) v v no db rr v v dif(min) m ? z o ma i o(short) a i o(peak) mv/ c ? v o /t a 25 24 t j = 25 c v i = 28 to 38v, i o = 5ma to 1a, t j = 0 to 125 c, p d * 480 18 v i = 27 to 38v, t j = 25 c 12 i o = 5ma to 1.5a, t j = 25 c i o = 250 to 750ma, t j = 25 c v i = 30 to 36v, t j = 25 c 4.1 t j = 25 c 6 v i = 27 to 38v, t j = 25 c 170 i o = 5ma to 1a, t j = 25 c f = 10hz to 100khz 1 0.5 240 25.2 480 240 8 50 23 22.8 v i = 28 to 38v, i o = 100ma, f = 120hz 2 i o = 1a, t j = 25 c 28 700 f = 1khz 2 v i = 38v, t j = 25 c 4 t j = 25 c ? 1.4 i o = 5ma, t j = 0 to 125 c parameter symbol conditions min typ max output voltage output voltage tolerance line regulation load regulation bias current bias current fluctuation to input bias current fluctuation to load output noise voltage ripple rejection ratio minimum input/output voltage difference output impedance output short-circuit current peak output current output voltage temperature coefficient unit note 1) the specified condition t j = 25 c means that the test should be carried out within so short a test time (within 10ms) that the characteristic value drift due to the chip junction temperature rise can be ignored. note 2) unless otherwise specified, v i = 33v, i o = 500ma, c i = 0.33 f and c o = 0.1 f. * an78xx series: 15w, AN78XXF series: 10.25w
an78xx/AN78XXF series voltage regulators 8 main characteristic curve 7 6 5 4 3 2 1 0 0 0.6 1.2 1.8 2.4 output current i o (a) output voltage v o (v) current limiting characteristic 2.4 2.0 1.6 1.2 0.8 0.4 0 ? 40 0 40 80 120 160 junction temperature t j ( c) minimum input/output voltage difference v dif(min.) (v) v dif(min.) ? t j 16 14 12 10 8 6 4 2 0 0 40 80 120 160 ambient temperature t a ( c) power dissipation p d (w) p d ? t a (AN78XXF series) i o = 1a 500ma 200ma 20ma 0ma 024 an7805 6810 time t ( s) 10 0 ? 10 ? 20 20 15 10 5 output voltage fluctuation (mv) input voltage v i (v) input transient response 01020 an7805 30 40 50 time t ( s) 1 0 ? 1 ? 2 2 1 0 output voltage fluctuation (v) load current i o (a) load transient response v i = 10v t j = 25 c an7805 16 14 12 10 8 6 4 2 0 0 40 80 120 160 ambient temperature t a ( c) power dissipation p d (w) p d ? t a (an78xx series) (1) (2) (3) (4) (1) (2) (3) (4) thermal resistance value: r th(j-c) = 5 c/w (max.) r th(j-a) = 65 c/w (max.) installation condition to heat sink tightening torque 6kgcm heat radiation compound used (1) infinite heat sink: 15.0w (2) 5 c/w heat sink: 12.5w (3) 15 c/w heat sink: 6.3w (4) without heat sink: 1.923w thermal resistance value: r th(j-c) = 12.2 c/w (max.) r th(j-a) = 65 c/w (max.) installation condition to heat sink tightening torque 6kgcm heat radiation compound used (1) infinite heat sink: 10.25w (2) 5 c/w heat sink: 7.3w (3) 15 c/w heat sink: 4.5w (4) without heat sink: 1.923w
voltage regulators an78xx/AN78XXF series 9 usage notes 1. cautions for a basic circuit c i : when a wiring from a smoothing circuit to a three-pin regulator is long, it is likely to oscillate in output. a capacitor of 0.1 f to 0.47 f should be connected near an input pin. c o : when any sudden change of load current is likely to occur, connect an electrolytic capacitor of 10 f to 100 f to improve a transitional response of output voltage. d i : normally unnecessary. but add it in the case that there is a residual voltage at the output capacitor co even after switching off the supply power because a current is likely to flow into an output pin of the ic and damage the ic. 2. other caution items 1) short-circuit between the input pin and gnd pin if the input pin is short-circuitted to gnd or is cut off when a large capacitance capacitor has been con- nected to the ic's load, a voltage of a capacitor con- nected to an output pin is applied between input/out- put of the ic and this likely results in damage of the ic. it is necessary, therefore, to connect a diode, as shown in figure 2, to counter the reverse bias between input/output pins. 2) floating of gnd pin if a gnd pin is made floating in an operating mode, an unstabilized input voltage is outputted. in this case, a thermal protection circuit inside the ic does not normally operate. in this state, if the load is short-circuited or overloaded, it is likely to damage the ic. application circuit examples 1. current bootstrap circuit basic regulator circuit c i : c i is necessary when the input line is long. c o : c o improves the transient response. c o c i input output an78xx AN78XXF common 13 2 v o v o v o ' 0.33 f 0.1 f v i v i i o i bias v o = v o ' + i bias + r 1 r 2 v o ' 3 ? q 1 an78xx AN78XXF an78xx AN78XXF 13 2 1 3 2 r 2 r 1 note) v o varies due to sample to sample variation of i bias . never fail to adjust individually with r 1 . figure 1 c o v o c i v i d i 1 3 2 in gnd out output figure 2 c o 1 3 2 + ? 2. adjustable output regulator
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