82 unit v a c features ? integrated switching ic and coil construction ? requires 2 external components only ? low switching noise ? heatsink not required ? built-in overcurrent and thermal protection circuits ? built-in soft start circuit (output on/off control)...si-8500l series applications ? telephone power supplies ? onboard local power supplies lineup separate excitation switching type with coil symbol v in p d t j t stg si-8400l/8500l series recommended operating conditions absolute maximum ratings unit v a c unit v w c c symbol v in i o t op symbol v in i o t op ratings si-8400l si-8500l 35 1.25 3 +100 C 25 to +85 part number si-8401l si-8402l si-8403l si-8405l si-8501l si-8502l si-8503l si-8504l si-8505l v o (v) 5.0 12.0 3.3 15.0 5.0 12.0 3.3 9.0 15.0 i o (a) 0.5 0.4 0.5 0.4 1.0 parameter dc input voltage range output current range operating temperature range parameter dc input voltage range output current range operating temperature range parameter dc input voltage power dissipation junction temperature storage temperature ratings si-8401l si-8402l si-8403l si-8405l 7 to 33 15 to 33 5.3 to 33 18 to 33 0 to 0.5 0 to 0.4 0 to 0.5 0 to 0.4 C 20 to +85 ratings si-8501l si-8502l si-8503l si-8504l si-8505l 7 to 33 15 to 33 5.3 to 33 12 to 33 18 to 33 0 to 1.0 C 20 to +85 si-8400l/8500l series
83 (t a =25 c) unit v % kh z mv mv mv/ c mv p-p a electrical characteristics (t a =25 c) unit v % kh z mv mv mv/ c mv p-p a symbol v o conditions conditions f conditions ? v oline conditions ? v oload conditions ? v o / ? t a ? v r conditions i s1 conditions parameter output voltage efficiency switching frequency line regulation load regulation temperature coefficient of output voltage switching ripple voltage (c 2 =470 f) overcurrent protection starting current parameter output voltage efficiency switching frequency line regulation load regulation temperature coefficient of output voltage switching ripple voltage (c 2 =470 f) overcurrent protection starting current symbol v o conditions conditions f conditions ? v oline conditions ? v oload conditions ? v o / ? t a ? v r conditions i s1 conditions ratings si-8401l si-8402l si-8403l si-8405l min. typ. max. min. typ. max. min. typ. max. min. typ. max. 4.80 5.00 5.20 11.40 12.00 12.60 3.17 3.30 3.43 14.25 15.00 15.75 v in =20v, i o =0.3a v in =24v, i o =0.3a v in =15v, i o =0.3a v in =27v, i o =0.3a 80 88 75 89 v in =20v, i o =0.3a v in =24v, i o =0.3a v in =15v, i o =0.3a v in =27v, i o =0.3a 60 60 60 60 v in =20v, i o =0.3a v in =24v, i o =0.3a v in =15v, i o =0.3a v in =27v, i o =0.3a 80 100 100 130 60 80 100 130 v in =10 to 30v, i o =0.3a v in =18 to 30v, i o =0.3a v in =8 to 30v, i o =0.3a v in =21 to 30v, i o =0.3a 30 40 70 95 20 30 90 120 v in =20v, i o =0.1 to 0.4a v in =24v, i o =0.1 to 0.4a v in =15v, i o =0.1 to 0.4a v in =27v, i o =0.1 to 0.4a 0.5 1.5 0.5 1.5 20 40 35 70 15 30 40 80 v in =20v, i o =0.3a v in =24v, i o =0.3a v in =15v, i o =0.3a v in =27v, i o =0.3a 0.55 0.45 0.55 0.45 v in =10v v in =18v v in =8v v in =21v ratings si-8501l si-8502l si-8503l si-8504l si-8505l min. typ. max. min. typ. max. min. typ. max. min. typ. max. min. typ. max. 4.80 5.00 5.20 11.40 12.00 12.60 3.17 3.30 3.43 8.55 9.00 9.45 14.25 15.00 15.75 v in =20v, i o =0.5a v in =24v, i o =0.5a v in =15v, i o =0.5a v in =21v, i o =0.5a v in =25v, i o =0.5a 83 89 79 87 90 v in =20v, i o =0.5a v in =24v, i o =0.5a v in =15v, i o =0.5a v in =21v, i o =0.5a v in =25v, i o =0.5a 60 60 60 60 60 v in =20v, i o =0.5a v in =24v, i o =0.5a v in =15v, i o =0.5a v in =21v, i o =0.5a v in =25v, i o =0.5a 70 130 70 130 50 80 70 130 70 130 v in =10 to 30v, i o =0.5a v in =18 to 30v, i o =0.5a v in =8 to 30v, i o =0.5a v in =15 to 30v, i o =0.5a v in =21 to 30v, i o =0.5a 30 55 30 55 20 45 30 55 30 55 v in =20v, i o =0.2 to 0.8a v in =24v, i o =0.2 to 0.8a v in =15v, i o =0.2 to 0.8a v in =21v, i o =0.2 to 0.8a v in =25v, i o =0.2 to 0.8a 0.5 1.5 0.5 1.0 1.5 45 30 15 25 30 v in =20v, i o =0.5a v in =24v, i o =0.5a v in =15v, i o =0.5a v in =21v, i o =0.5a v in =25v, i o =0.5a 1.1 1.1 1.1 1.1 1.1 v in =18v v in =24v v in =12v v in =21v v in =25v si-8400l/8500l series
84 external dimensions a. part number b. lot number open air type weight: approx. 5.1g si-8400l si-8500l a. part number b. lot number open air type weight: approx. 14.5g si-8400l si-8500l block diagram standard external circuit q e w r v in vo 0.8max. l in gnd (10.16) (7.62) (2.19) (2.17) 14.5 0.5 12 0.5 13.2 0.6 10 0.2 4.7 0.6 a b terminal 1 marking y qwe r sk v in v out ss gnd l in 18 3.7 26 0.1 26 0.1 0.6 418 2 a b terminal 1 marking reg. ocp osc reset amp. tsd v ref comp. latch & drive 2 v in v o l in l 1 di 1 mic 1 gnd 41 3 v o v in gnd gnd c 1 c 2 220 f 470 f ++ 1 4 3 n.c 2 v out l in gnd si-8400l v in v o v in gnd gnd c 1 c 2 c 3 470 f 470 f ++ 1 6 34 n.c 2 v out l in gnd s.s si-8500l v in pin compatible with si-8200l c 3 is necessary only for using soft start function. pin compatible with si-8300l 3 2 di 1 mic 1 gnd s.s. 61 4 l 1 reg. ocp osc reset amp. tsd v ref comp. latch & drive v in v o l in si-8400l/8500l series (unit:mm)
85 t a -p d characteristics si-8500l application circuit terminal no.2 is for soft start. connecting a capacitor to the terminal enables the soft start function. see page 77 for the formulas to calcu- late delay time and rise time. output can be turned on and off by using the soft start terminal. to stop output, set the soft start terminal voltage to v ssl (0.2v typ.) or less. to switch the potential of the soft start terminal, drive the open collector of the transistor. since the discharge current from c 3 flows to the on/off control transistor, limit the current for protection. the ss terminal is pulled up to the power supply in the ic and no external voltage can be applied. caution 1. allocation of components for the best operating environment, the ground should be a single ground line at the gnd terminal (terminal 2 on the si-8400l, terminal 3 on the si-8500l), and the wiring from c 1 and c 2 to ground should be as short as possible. 2. capacitors c 1 and c 2 1) they must satisfy the breakdown voltage and allowable ripple current. exceeding the ratings of these capacitors or using them without derating shortens their service lives and may also cause abnorm al oscillation of the ic. 2) c 2 must be a low-impedance type capacitor to ensure minimum ripple voltage and stable switching operation. 3) c 3 (si-8500l only) is a capacitor for soft start. when not using soft start, leave terminal 2 open. it is pulled up inside the ic . 3. terminals l in and nc in the connection diagram must be left unconnected to other circuits. 4. the ic's metalic heatsink is electrically floating. do not connect it to gnd or any other circuit. 5. since the si-8400l and 8500l series have an open-package construction, they can only be operated in specific environments. v erify the operating environment and use the conditions indicated in the reliability data. 1.5 1.0 0.5 0 02550 ambient temperature t a ( c) power dissipation p d (w) 75 100 si-8400l 3.0 2.0 1.0 0 0 25 50 75 100 si-8500l ambient temperature t a ( c) power dissipation p d (w) si-8500l si-8500l s.s. 2 s.s. 2 s.s. c 3 c 3 2 v o. on/off soft start soft start +v o on/off si-8500l si-8400l/8500l series v o :output voltage i o :output current ? :efficiency (%) the efficiency depends on the input voltage and the output current. thus, obtain the value from the efficiency graphs on p.86, 87 and substitute the percentage in the formula above. p d =v o ? i o 100 C 1 ?
86 typical characteristics (si-8400l series) output voltage(si-8401l) efficiency characteristics(si-8401l) load regulation(si-8401l) temperature characteristics(si-8401l) overcurrent protection characteristics(si-8401l) thermal protection characteristics(si-8401l) output voltage(si-8402l) efficiency characteristics(si-8402l) load regulation(si-8402l) 0 6 5 4 3 2 1 0 246 input voltage v in (v) output voltage v o (v) 810 t a =25 c i o =0a 0.5a 0.3a 0.1a output current i o (a) efficiency (%) 0 100 90 80 70 60 50 0 0.1 0.2 0.3 0.4 0.5 t a =25 c v in 7v 10v 20v 25v 33v 20v 25v 33v 10v 7v output voltage v o (v) output current i o (a) 0 5.3 5.2 5.1 5.0 4.9 4.8 0 0.1 0.2 0.3 0.4 0.5 t a =25 c v in =33v 20v 10v 7v v in =20v, i o =0.3a output voltage v o (v) C 40 00 100 90 80 70 60 50 40 5.3 5.2 5.1 5.0 4.9 4.8 4.7 C 20 0 20 ambient temperature t a ( c) efficiency (%) frequency f (khz) 40 60 80 100 v o f output voltage v o (v) output current i o (a) 0 6 5 4 3 2 1 0 0.5 1.0 1.5 2.0 t a =25 c 20v 33v v in =7v output voltage v o (v) 0 6 5 4 3 2 1 0 50 100 case temperature t c ( c) 150 200 v in =20v, i o =20ma 0 14 12 10 6 8 2 0 4 510 input voltage v in (v) output voltage v o (v) 15 20 t a =25 c 0.4a 0.2a i o =0a 0 100 90 80 70 60 50 0 0.1 0.2 0.3 0.4 v in = 15v 2 4 v 33v output current i o (a) efficiency (%) t a =25 c output voltage v o (v) 0 12.3 12.2 12.1 12.0 11.9 11.8 0 0.1 0.2 0.3 0.4 v in =33v 24v 20v 15v output current i o (a) t a =25 c si-8400l/8500l series note on thermal protection: the thermal protection circuit is intended for protection against heat during instantaneous short-circuiting. its operation is not guaran- teed for continuous heating condition such as short-circuiting over extended periods of time.
87 typical characteristics (si-8500l series) output voltage(si-8501l) efficiency characteristics(si-8501l) load regulation(si-8501l) temperature characteristics(si-8401l) overcurrent protection characteristics(si-8401l) thermal protection characteristics(si-8401l) output voltage(si-8502l) efficiency characteristics(si-8502l) load regulation(si-8502l) 0 7 6 5 4 3 2 1 0 5101520 t a =25 c i o =0a 1a 0.5a input voltage v in (v) output voltage v o (v) 0 100 90 80 70 60 50 40 0 0.25 0.5 0.75 1 t a =25 c v in =7v 20v 3 3 v output current i o (a) efficiency (%) 0 5.15 5.10 5.05 5.00 4.95 4.90 4.85 0 0.25 0.5 0.75 1 t a =25 c 20v 15v v in =33v 7v output voltage v o (v) output current i o (a) C 40 0 5.15 5.10 5.05 5.00 4.95 4.90 4.85 0 40 80 120 v o f v in =20v, i o =0.5a output voltage v o (v) 0 100 90 80 70 60 50 40 ambient temperature t a ( c) efficiency (%) frequency f (khz) 0 7 6 5 4 3 2 1 0 1234 v in =7v 20v t a =25 c 33v output voltage v o (v) output current i o (a) 0 7 6 5 4 3 2 1 0 40 80 120 160 output voltage v o (v) ambient temperature t a ( c) v in =20v, i o =0a 0 14 12 10 6 8 2 0 4 5101520 input voltage v in (v) output voltage v o (v) t a =25 c i o =0a 1a 0.5a 0 100 90 80 60 70 40 0 50 0.25 0.5 0.75 1.0 v in =15v 24v 33v output current i o (a) efficiency (%) t a =25 c 0 12.3 12.2 12.1 11.9 12.0 11.7 0 11.8 0.25 0.5 0.75 1 output voltage v o (v) v in =33v 24v 18v 15v output current i o (a) t a =25 c si-8400l/8500l series note on thermal protection: the thermal protection circuit is intended for protection against heat during instantaneous short-circuiting. its operation is not guaran- teed for continuous heating condition such as short-circuiting over extended periods of time.
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