october 2015 docid028457 rev 1 1 / 5 for further information contact your local stmicroelectronics sales office www.st.com steval - isa176v1 altair05t - 800 5 w wide range cv - cc optoless adapter evaluation board data brief features ? universal input mains range: 90 - 264 v ac, frequency 45 - 65 hz ? output voltage: 5 v @ 1 a continuous operation ? optoless constant voltage - constant current output regulation ? standby mains consumption: < 100 mw @ 230 v ac ? average efficiency: >70% ? emi: in accordance with en55022 - class - b ? rohs compliant description the steval - isa176v1 evaluation board implements a 5 w (5 v / 1 a) wide - range mains battery charger with constant voltage/constant current, tailored for ac - dc chargers for mobile phones and adapters or other hand - held equipment. the core of the application is the altair05t - 800, the first all - primary sensing switching regulator of the altair family. the ic combines a high - performance, low - voltage pwm controller chip and an 800 v, avalanche - rugged power mosfet in the same package. the pwm chip is a quasi - resonant (qr) current mode controller ic specifically designed for qr zvs (zero voltage switching at switch turn - on) flyback converters. the device is capable of providing constant output voltage (cv) and constant output current (cc) regulation using primary - sensing feedback. this eliminates the need for the optocoupler, the secondary voltage reference and the current sensor, while still maintaining quite accurate regulation. in addition, it is possible to compensat e the voltage drop on the output cable to improve cv regulation on the externally accessible terminals. extremely low consumption under no load conditions is ensured thanks to controlled burst mode operation that, along with the built - in high voltage start up circuit and the low operating current of the device, helps minimize the residual input consumption. although an auxiliary winding is required in the transformer to correctly perform cv/cc regulation, the chip can be powered directly from the rectified m ains. this is useful particularly during cc regulation, where the flyback voltage is generated by the winding drops.
schematic diagram steval - isa176v1 2 / 5 docid028457 rev 1 1 schematic diagram figure 1 : evlaltair05t - 5w circuit schematic c 1 4 . 7u f 400 v n . c . r 5 2 . 5 v cd c c o m p s o urc e dr a i n v d d + - curr e n t c o n t r o l i r e f g n d f b / z c d a l t a i r 0 5 1 . 2 r 8 1n f c 3 d 7 s t t h 1 l0 6 120 k r 2 6 . 2 k r 6 10 0 n f c 9 c 4 10u f c 5 1n f t 1 b r m b6 s - r c 2 . 2n f - y c a p c 1 0 r 7 10 k r 4 0 30 k r 3 c 2 4 . 7u f 400 v l 1 47 0 u h r 1 2 2 1 w d 7 s t ps 3 l40 u f c 6 47 0 n f c 7 4 . 7n f r 9 1 . 3 k c 8 10 0 0u f lo w es r d 2 b a t 4 6 5v - 1 a g n d a c i n a c i n gspg0710151050sg
steval - isa176v1 schematic diagram docid028457 rev 1 3 / 5 figure 2 : output characteristics 0 . 0 0 . 1 0 . 2 0 . 3 0 . 4 0 . 5 0 . 6 0 . 7 0 . 8 0 . 9 1 . 0 1 . 1 0 1 2 3 4 5 6 115 v a c 230 v a c v o u t [ v ] i o u t [ a ] gspg071015 1 100sg
revision history steval - isa176v1 4 / 5 docid028457 rev 1 2 revision history table 1: document revision history date version changes 19 - oct - 2015 1 initial release.
steval - isa176v1 docid028457 rev 1 5 / 5 important notice C please read carefully stmicroelectronics nv and its subsidiaries (st) reserve the right to make changes, corrections, enhancements, modifications, and improvements to st products and/or to this document at any time without notice. purchasers should obtain the latest relevant information on st products before placing o rders. st products are sold pursuant to sts terms and conditions of sale in place at the time of order acknowledgement. purchasers are solely responsible for the choice, selection, and use of st products and st assumes no liability for applicati on assi stance or the design of purchasers products. no license, express or implied, to any intellectual property right is granted by st herein. resale of st products with provisions different from the information set forth herein shall void any warranty gran ted by st for such product. st and the st logo are trademarks of st. all other product or service names are the property of their respective owners. information in this document supersedes and replaces information previously supplied in any prior versions of this document. ? 2015 stmicroelectronics C all rights reserved
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