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LM3524DM 数据表(PDF) 19 Page - Texas Instruments

部件名 LM3524DM
功能描述  Regulating Pulse Width Modulator
PDF  29 Pages
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制造商  TI [Texas Instruments]
网页  http://www.ti.com
标志 TI - Texas Instruments

LM3524DM 数据表(HTML) 19 Page - Texas Instruments

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LM2524D, LM3524D
www.ti.com
SNVS766E – JUNE 2009 – REVISED MAY 2013
Figure 28. Basic Step-Up Switching Regulator
Figure 29. Relation of Switch Timing to Inductor Current in Step-Up Regulator
(16)
Since
ΔIL+ = ΔIL−, VINtON = VotOFF − VINtOFF,
and neglecting VSAT and VD1
(17)
The above equation shows the relationship between VIN, Vo and duty cycle.
In calculating input current IIN(DC), which equals the inductor's DC current, assume first 100% efficiency:
(18)
for
η = 100%, POUT = PIN
(19)
This equation shows that the input, or inductor, current is larger than the output current by the factor (1 +
tON/tOFF). Since this factor is the same as the relation between Vo and VIN, IIN(DC) can also be expressed as:
(20)
Copyright © 2009–2013, Texas Instruments Incorporated
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Product Folder Links: LM2524D LM3524D



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