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Reference design PR791 utilizes another configuration of the multi transformer solution. It is actually the preferred method as it allows two strings to be regulated per transformer, further reducing system cost. The DC blocking cap in the lower leg of the secondary side of the transformer balances the circuit for the minor differences in the string characteristics and also prevents the transformer from saturating if an LED shorts. Two filter caps are also added to provide clean, low ripple DC current to the strings.
PTM Published on: 2011-11-02
