代理產線

SC445

 2016-07-13

【基本資料】

【產品特性】

Input voltage — 4.75V to 27V
Output voltage—up to 42V
Drives up to 40 WLEDs in 4 strings
Programmable LED current for up to 150mA per string
+/- 2% string-to-string current matching
Up to 90% efficiency
Wide 0.2% to 100% PWM dimming range
Enable analog dimming
Integrated 3.0A power switch
700KHz switching frequency for small size
Adjustable OVP for cost-effective output cap selection
Open/short LED protection
Short LED protection enable/disable
Thermal protection with auto-recovery
Thermally enhanced TSSOP-20 EDP package
Drives up to 40 WLEDs in 4 strings
Programmable LED current for up to 150mA per string
+/- 2% string-to-string current matching
Up to 90% efficiency
Wide 0.2% to 100% PWM dimming range
Enable analog dimming
Integrated 3.0A power switch
700KHz switching frequency for small size
Adjustable OVP for cost-effective output cap selection
Open/short LED protection
Short LED protection enable/disable
Thermal protection with auto-recovery

【產品應用】

Medium-sized LCD panel
Notebook Display
Automotive Car Navigation Display
Sub-Notebook and Tablet Computer Displays
Portable Media Players

【文字介紹】

SC445是一個高效率的多串WLED驅動器,具有集成升壓轉換器。它工作在寬輸入電壓範圍為4.5V至27V,並可以保持快速的瞬態輸入電壓高達5V /μs的。它可以驅動多達40個WLED4串電流高達每串150毫安。該stringto串電流匹配度為2%。
整體效率大於90%的電流檢測電壓和一個低阻抗的內部電源開關。寬PWM調光範圍500:1。
在700kHz的開關頻率允許用戶優化外部元件尺寸以提高效率。當每串不到10個LED,用戶可以調整輸出電壓保護和電壓額定值輸出電容器以減少的相關成本。
SC445還提供全面的開路和短路LED保護功能。可關閉LED開路或短路LED串的條件同時保持其他的正常操作中,未受影響的LED串。此功能可讓液晶面板保持可見即使在LED故障,電線斷路或短路條件。內部熱關斷保護在IC從在異常情況過熱。