1 shantou huashan electronic devices co.,ltd . ? description the h7818 a series of three terminal positive regulators are available in the to - 220 package and with several fixed output voltages, making them useful in a wide range of applications . each type employs internal current limiting, thermal shut down and safe operating area protection, making it essentially indestructible. if adequate heat sinking is provided, they can deliver over 1a output current. although designed primarily as fixed v oltage regulator, these devices can be used with external components to obtain adjustable voltages and currents. ? features ? absolute maximum ratings ? t a =25 ?? ? v i ?a?a input voltage ( for v o =5 v to 18v) ?-?-?-?-?-?- 35v r | jc ?a?a thermal resistance junction - cases ?-?-?-?- 5 ?? /w r | j a ?a?a thermal resistance junction - air ?-?-?-?- 65 ?? /w t opr ?a?a operating temperature range ?-?-?-?-?- 0~125 ?? t stg ?a?a storage temperature r ange ?-?-?-?-?- - 65~150 ?? 1 d input 2 d gnd 3 d output l output current up to 1a l output voltages of 18v l thermal overload protection l short circuit prot ection l output transistor safe operating area protection to - 2 20 3 - terminal fixed voltage regulator h 7818a
2 shantou huashan electronic devices co.,ltd . ? refer to test circuit, unless otherwise specified ? 0 ??? t j ? 125 ?? ,i o =500ma, v i = 27 v ,c i =0.33 | f ,c o =0.1 | f ? symbol parameter min. typ. max. unit cond itions 17.3 18 18.7 t j = 25 ?? v o output voltage 17.1 18 18.9 v 5 .o ma ? i o ? 1. 0a, p d ? 15w, 21v ? v i ? 33v 15 180 t j = 25 ?? , 20.6 v ? v i ? 33v | v o line regulation (note1) 5 90 m v t j = 25 ?? , 24v ? v i ? 30v 15 10 0 t j = 25 ?? , 5.0 ma ? i o ? 1 .5 a | v o load regulation (note1) 7 50 m v t j = 25 ?? , 250 ma ? i o ? 750 ma i q quiescent current 5.2 8 ma t j = 25 ?? 0.5 5 ma ? i o ? 1 .0 a | i q quiescent current change 0.8 m a 21v ? v i ? 33v | v o / | t output voltage drift - 1 m v/ ?? i o =5ma v n output noise voltage 110 | v t a = 25 ?? , 10hz ? f ? 10 0 khz r r ripple rej ection 53 69 db f=120hz , 22v ? v i ? 32v v d dropout voltage 2 v i o =1a, t j = 25 ?? r o output resistance 22 m |? f=1 k hz i sc short circuit current 250 ma v i = 35v , t a = 25 ?? i pk peak current 2.2 a t j = 25 ?? h 7818a
3 shantou huashan electronic devices co.,ltd . ? ? 1 ? 4 ? 2 ? 3 ? 5 ? 6 ? h 7818a
4 shantou huashan electronic devices co.,ltd . 7 ? 8 ? 9 ? 10 ? 11 ? 13 ? 12 ? h 7818a
5 shantou huashan electronic devices co.,ltd . h 7818a
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