Cirrus-logic CS1680 Manuel d'utilisateur

Copyright  Cirrus Logic, Inc. 2014(All Rights Reserved)Cirrus Logic, Inc.http://www.cirrus.comCS1680Dimmable LED Driver ICfor Low-voltage LightingFea

CS168010 DS1055F1boost output voltage continues to fall and reaches thelowest threshold set by constant KDEC(on), the LEDoutput current is decreased a

CS1680DS1055F1 11page 11). If the boost output voltage exceeds theovervoltage protection threshold, a BOP fault signal isgenerated. Boost overvoltage

CS168012 DS1055F1period T2BUCK. The controller then uses thetime TTBUCK to determine gate turn-on time.5.4.2 Current Sense Resistor ModelThe digital a

CS1680DS1055F1 13When exiting reset, the chip enters startup and the ADCquickly (<15ms) tracks the external temperature to checkif it is below 120°

CS168014 DS1055F16. PACKAGE DRAWING mm inchDimension MIN NOM MAX MIN NOM MAXA -- -- 1.1 -- -- 0.043A1 0.05 -- 0.15 0.002 -- 0.006A2 0.85 -- 0.95 0.03

CS1680DS1055F1 15Notes:1. Controlling dimensions are in millimeters.2. Dimensions and tolerances per ASME Y14.5M.3. This drawing conforms to JEDEC out

CS168016 DS1055F1REVISION HISTORYContacting Cirrus Logic SupportFor all product questions and inquiries contact a Cirrus Logic Sales Representative. T

CS16802 DS1055F11. INTRODUCTIONA typical schematic using the CS1680 for boost-buckapplications is shown on the previous page.A startup circuit provide

CS1680DS1055F1 32. PIN DESCRIPTIONPin NamePin # I/ODescriptionCTRL21INPeak Current — Connect a resistor to this pin to set the comparator threshold to

CS16804 DS1055F13. CHARACTERISTICS AND SPECIFICATIONS3.1 Electrical CharacteristicsTypical characteristics conditions: - TA=25°C, VDD= 12V, GND = 0 V-

CS1680DS1055F1 5Boost Gate DriverOutput Source Resistance ZBST(Source)- 19.9 - Output Sink Resistance ZBST(Sink)- 10.5 - Rise TimeCL=0.25nF-11-nsFal

CS16806 DS1055F1Notes: 1. Threshold is characterized as a percentage of the full-scale boost output voltage, VBST(full)2. The CS1680 has an internal s

CS1680DS1055F1 74. TYPICAL PERFORMANCE PLOTSFigure 3. UVLO CharacteristicsFigure 4. Supply Current vs. VoltageFigure 5. Turn On/Off Threshold Volta

CS16808 DS1055F15. GENERAL DESCRIPTION5.1 OverviewThe CS1680 is a cascade boost-buck dimmable LEDdriver for the 12V halogen lamp-replacement market.Th

CS1680DS1055F1 9voltage to reach the regulation target set byconstant KMode1(target). If boost output voltage VBST isbelow the target regulation point