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## RT8525 Datasheet(PDF) 8 Page - Richco, Inc.

 Part # RT8525 Description Boost Controller with Dimming Control Download 10 Pages Scroll/Zoom 100% Manufacturer RICHCO [Richco, Inc.] Direct Link http://www.richco-inc.com Logo

## RT8525 Datasheet(HTML) 8 Page - Richco, Inc.

 8 / 10 page8RT8525www.richtek.comDS8525-01 March 2012©Copyright 2012 Richtek Technology Corporation. All rights reserved.is a registered trademark of Richtek Technology Corporation.Thermal ConsiderationsFor continuous operation, do not exceed absolutemaximum junction temperature. The maximum powerdissipation depends on the thermal resistance of the ICpackage, PCB layout, rate of surrounding airflow, anddifference between junction and ambient temperature. Themaximum power dissipation can be calculated by thefollowing formula :PD(MAX) = (TJ(MAX)− TA) / θJAwhere TJ(MAX) is the maximum junction temperature, TAisthe ambient temperature, andθJAis the junction to ambientthermal resistance.For recommended operating condition specifications, themaximum junction temperature is 125°C. The junction toambient thermal resistance,θJA, is layout dependent. ForSOP-14 packages, the thermal resistance,θJA, is 100°C/W on a standard JEDEC 51-3 single-layer thermal testboard. The maximum power dissipation at TA = 25°C canbe calculated by the following formula :PD(MAX) = (125°C − 25°C) / (100°C/W) = 1.000W forSOP-14 packageThe maximum power dissipation depends on the operatingambient temperature for fixed TJ(MAX) and thermalresistance,θJA. The derating curve in Figure 4 allows thedesigner to see the effect of rising ambient temperatureon the maximum power dissipation.×××+××ηOUTOUTLPKINVIVIN D TI=V2 Lwhereη is the efficiency of the power converter.⎡⎤⎛⎞ ⎛⎞×+ Δ−+− Δ−×⎜⎟ ⎜⎟⎢⎥⎝⎠ ⎝⎠⎣⎦×× ΔININLOUTINLOUTOUTOUTOUT1SWV111Q =IIIIII222V1 = CVfwhere fSW is the switching frequency, andΔIL is theinductor ripple current. Move COUT to the left side toestimate the value ofΔVOUT1 as the following equation :×Δ××ηOUTOUT1OUTSWDIV=CfFinally, by taking ESR into consideration, the overall outputripple voltage can be determined as the followingequation :×Δ×+××OUTOUTINOUTSWDIV= IESRη CfFigure 3. The Output Ripple Voltage without theContribution of ESRDiode SelectionSchottky diodes are recommended for most applicationsbecause of their fast recovery time and low forward voltage.The power dissipation, reverse voltage rating and pulsatingpeak current are the important parameters for Schottkydiode selection. Make sure that the diode's peak currentrating exceeds ILPK, and reverse voltage rating exceedsthe maximum output voltage.Capacitor SelectionOutput ripple voltage is an important index for estimatingthe performance. This portion consists of two parts, oneis the product of input current and ESR of output capacitor,another part is formed by charging and dischargingprocess of output capacitor. Refer to figure 3, evaluateΔVOUT1 by ideal energy equalization. According to thedefinition of Q, the Q value can be calculated as followingequation :TimeTimeInductor CurrentOutput CurrentOutput RippleVoltage (ac)(1-D)TSΔVOUT1ΔILInput Currentselected with a saturated current rating greater than thepeak current provided by the following equation :

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