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LM5022MM 데이터시트(PDF) 21 Page - Texas Instruments

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부품명 LM5022MM
상세설명  60V Low Side Controller for Boost and SEPIC
PDF  34 Pages
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제조업체  TI1 [Texas Instruments]
홈페이지  http://www.ti.com
Logo TI1 - Texas Instruments

LM5022MM 데이터시트(HTML) 21 Page - Texas Instruments

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100
1k
10k
100k
1M
FREQUENCY (Hz)
-30
-15
0
15
30
45
60
1
S
Qn =
-D + 0.5 + (1 - D)
Se
Sn
LM5022
www.ti.com
SNVS480E – JANUARY 2007 – REVISED OCTOBER 2011
(49)
The sampling double corner frequency is:
ωn = π x fSW
(50)
The natural inductor current slope is:
Sn = RSNS x VIN / L
(51)
The external ramp slope is:
Se = 45 µA x (2000 + RS1 + RS2)] x fSW
(52)
In the equation for APS, DC gain is highest when input voltage and output current are at the maximum. In this the
example those conditions are VIN = 16V and IO = 500 mA.
DC gain is 44 dB. The low frequency pole fP = 2πωP is at 423Hz, the ESR zero fZ = 2πωZ is at 5.6 MHz, and the
right-half plane zero fRHP = 2πωRHP is at 61 kHz. The sampling double-pole occurs at one-half of the switching
frequency. Proper selection of slope compensation (via RS2) is most evident the sampling double pole. A well-
selected RS2 value eliminates peaking in the gain and reduces the rate of change of the phase lag. Gain and
phase plots for the power stage are shown in Figure 9.
Figure 9. Power Stage Gain and Phase
Copyright © 2007–2011, Texas Instruments Incorporated
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