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LP5522 Datasheet(PDF) 11 Page - Texas Instruments |
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LP5522 Datasheet(HTML) 11 Page - Texas Instruments |
11 / 17 page tENTER + tBLANK CTRL LED To Standby T_TIMEOUT_L Run once command To Standby tENTER + tBLANK CTRL LED To Standby T_TIMEOUT_H T_TIMEOUT_L Run command LP5522 www.ti.com SNVS488 – JUNE 2007 LED OFF time counter can saturate also if Training end command is not given or no new ON time has been started. In this case saturated OFF time is recorded and chip goes to Standby. Recommended External Components INPUT CAPACITOR, CIN Although not required for normal operation, a capacitor can be added to VIN to reduce line noise. A surface- mount multi-layer ceramic capacitor (MLCC) is recommended. MLCCs with a X7R or X5R temperature characteristic are preferred. CURRENT SET RESISTOR, RISET If other than 5 mA current is required, RISET resistor can be used to adjust the current. For 20 mA current 24 kΩ resistor is required. Accuracy of the resistor directly effects to the accuracy of the LED current. 1% or better is recommended. LED Forward voltage of LED must be less than minimum input voltage minus minimum headroom voltage (VHR). For example with 2.7V input voltage and 20 mA LED current the maximum LED forward voltage is 2.7V - 100 mV = 2.6V. List of Recommended External Components Symbol Symbol Explanation Value Unit Type CIN VDD Bypass Capacitor 100 nF Ceramic, X7R or X5R RISET Current Set Resistor for 20 mA LED Current 24 k Ω 1% LED User defined Copyright © 2007, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: LP5522 |
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