UM10468
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© NXP B.V. 2011. All rights reserved.
User manual
Rev. 1 — 30 August 2011
14 of 27
NXP Semiconductors
UM10468
SSL2108X buck evaluation board
7.1 Active
bypass
An increased value for the inrush current resistor causes the board to operate with the
most phase cut dimmers, but also lowers the efficiency. If a higher power factor is not
required, but leading-edge dimmer compatibility and high efficiency are important, the
active bypass option is available. In this circuit, the inrush current resistor is bypassed
using an SCR (see
).
Fig 13. Active bypass
019aac538
56 Ω
1 MΩ
MCR22-6
22 nF
