data brief for further information contact your local stmicroelectronics sales office. may 2009 doc id 15674 rev 1 1/4 4 STEVAL-ISA010V1 ultra wide range dual output back converter demonstration board based on the viper16 features input voltage vin: 85 - 500 vac (f: 45 - 66 hz) output voltages: ? v1= 12 v 10% ? v2= 5 v 4% output current: 150 ma total (5 v and 12 v output) output current for full input voltage range standby: 96 mw at 230 vac short-circuit protection pcb type and size: ? fr4, single side 70 m ? dim.: 27 x 45 mm isolation: non isolated - n connected to output gnd emi: in accordance with en55022 - class b emc: surge - iec 61000-4-5 - 2 kv emc: burst - iec 61000-4-4 - 8 kv rohs compliant description this demonstration board based on viper16 is designed as an example of a simple non-isolated auxiliary power supply for a range of input voltages from 85 vac to 500 vac. there is an ever-increasing demand for small power supplies capable of working without voltage range limitations, even at nominal levels of 400 vac and 415 vac, respectively. the real voltage level can reach 500 vac (415 v + 20%). the major markets for this type of smps are home appliances and metering. the viper16 device includes an 800 v rugged power switch, a pwm controller, programmable overcurrent, overvoltage, overload, a hysteretic thermal protection, soft-start and safe auto-restart after any fault condition removal. burst mode operation at light load combined with the very low consumption of the device helps to meet standby energy-saving regulations. the significant benefit of this new chip derives from the jitter of the switching frequency and the possibility to supply the ch ip directly from the dc hv bus, so auxiliary supply is not mandatory. the viper16 is suitable for flyback or buck topologies and thanks to an internal self-supply circuit it does not require an auxiliary supply. STEVAL-ISA010V1 www.st.com
circuit schematic and pcb layout STEVAL-ISA010V1 2/4 doc id 15674 rev 1 1 circuit schematic and pcb layout figure 1. schematic diagram figure 2. pcb layout of the buck converter (top, bottom, bottom layout) r 9 1 k ? c 7 1.8 nf r 2 750 k ? r 5 750 k ? r 6 750 k ? r 8 750 k ? c 1 150 nf / x2 d 3 1n4007 l 1 2.2 mh d 5 stth108 d 6 15 v d 2 stth108 c 3 10 f / 450 v c 9 10 f / 35v c 5 220 f / 25 v l 2 1 mh r 1 22 ? r 4 9.1 k ? r 3 24 k ? 1 2 j 1 85 - 500 vac c 2 150 nf / x2 c 6 10 f / 35 v 1 2 3 j 2 output c 8 100 nf d 1 1n4148 3 1 2 v out v in gnd u 2 l78l05 d 4 1n4007 drain 7 drain 8 s 1 v dd 2 fb 4 comp 5 lim 3 u 1 viper16 c 4 10 f / 450 v r 7 n.a. am00361
STEVAL-ISA010V1 revision history doc id 15674 rev 1 3/4 2 revision history table 1. document revision history date revision changes 06-may-2009 1 initial release.
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