Both parts are optimized for single-cell Li-ion battery handheld applications. The SC652 supports up to five LEDs with one PWM dimming input.  The SC656 supports up to seven LEDs with one or two independent PWM dimming inputs for end products that have multiple zones of lighting.   

Recently, PWM dimming has become more popular due to its flexibility, cross-platform firmware compatibility, and extensive use in advanced power saving schemes such as ambient light sensing (ALS) and content adaptive brightness control (CABC).   However, most competing PWM dimming solutions simply turn on and off the LED current in synchronization to the PWM signal, resulting in three distinct negative effects:  1) increased voltage ripple on the input and outputs of the LED driver, which can couple noise into nearby circuits, 2) decreased efficiency because the LED forward voltage remains high even when dimming, and 3) potential display flicker, banding, or herringbone pattern noise due to the LED light interfering with the LCD refresh rate. 

這兩種零件都進過了優化設計，適用于單節鋰離子電池便攜應用。SC652最多可支持5個LED，而只需一個PWM調光控制輸入裝置。SC656最多可支持7個LED ，而只通過一個或兩個獨立式PWM調光控制輸入裝置 。用於最終用戶的輸入裝置具有多個光區深圳翻译公司。   

近來，因其靈活性、跨平臺固件相容性以及在先進的省電方案，如環境光線感應（ALS）和內容自適應亮度控制（CABC）中的廣泛應用，PWM調光控制已經變得越來越流行。但是，多數其他PWM調光控制解決方案都僅僅是在與PWM信號同步的情況下打開或關閉LED 電流，這導致了三種顯著不足：  1） 增加了LED驅動器的輸入和輸入電壓脈動，給鄰近電路帶來噪音，2）降低了效率，這是因為LED 正向電壓即時在調光控制時依然維持在較高水準，3）因LED光干擾LCD刷新率導致潛在的顯示幕閃爍、條紋或魚骨形干擾圖形雜訊广州翻译公司。