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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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LM3444MA 데이터시트(PDF) 11 Page - Texas Instruments |
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LM3444MA 데이터시트(HTML) 11 Page - Texas Instruments |
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11 / 30 page  = D = tON tON + tOFF = tON x fSW VO VIN L2 R3 C11 Q2 Q3 D10 ICOLL 4 6 7 8 R4 PGN D ISNS GAT E COFF LM3444 VBUCK C12 LM3444 www.ti.com SNVS682C – NOVEMBER 2010 – REVISED MAY 2013 Figure 15. LM3444 Buck Regulation Circuit OVERVIEW OF CONSTANT OFF-TIME CONTROL A buck converter’s conversion ratio is defined as: (3) Constant off-time control architecture operates by simply defining the off-time and allowing the on-time, and therefore the switching frequency, to vary as either VIN or VO changes. The output voltage is equal to the LED string voltage (VLED), and should not change significantly for a given application. The input voltage or VBUCK in this analysis will vary as the input line varies. The length of the on-time is determined by the sensed inductor current through a resistor to a voltage reference at a comparator. During the on-time, denoted by tON, MOSFET switch Q2 is on causing the inductor current to increase. During the on-time, current flows from VBUCK, through the LEDs, through L2, Q2, and finally through R3 to ground. At some point in time, the inductor current reaches a maximum (IL2-PK) determined by the voltage sensed at R3 and the ISNS pin. This sensed voltage across R3 is compared against the voltage of FILTER, at which point Q2 is turned off by the controller. Copyright © 2010–2013, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: LM3444 |
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