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LM5085MMX/NOPB Datasheet(PDF) 21 Page - Texas Instruments

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Part # LM5085MMX/NOPB
Description  75V Constant On-Time PFET Buck Switching Controller
PDF  33 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

LM5085MMX/NOPB Datasheet(HTML) 21 Page - Texas Instruments

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FB
LM5085
PGATE
GND
Q1
L1
COUT
RFB2
RFB1
VOUT
GND
D1
R4
R4 =
VRIP(min)
IOR(min)
FB
LM5085
PGATE
GND
Q1
L1
Cff
COUT
RFB2
RFB1
VOUT
GND
D1
R4
Cff =
3 x tON(max)
(RFB1//RFB2)
LM5085, LM5085-Q1
www.ti.com
SNVS565I – NOVEMBER 2008 – REVISED AUGUST 2015
Typical Application (continued)
(34)
where tON(max) is the maximum on-time, which occurs at minimum VIN. The next larger standard value capacitor
should be used for Cff.
Figure 27. Reduced Ripple Configuration
b) Lowest cost configuration: This configuration, shown in Figure 28, is the same as Figure 27 except Cff is
removed. Since the ripple voltage at VOUT is attenuated by RFB2 and RFB1, the minimum ripple required at VOUT is
equal to:
VRIP(min) = 25mV x (RFB2 + RFB1)/RFB1
(35)
The minimum value for R4 is calculated from:
(36)
where IOR(min) is the minimum ripple current, which occurs at minimum input voltage.
Figure 28. Lowest Cost Ripple Generating Configuration
Copyright © 2008–2015, Texas Instruments Incorporated
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Product Folder Links: LM5085 LM5085-Q1



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