LM5085MMXSLASHNOPB datasheet(21/33 Pages) TI

tên linh kiện	LM5085MMX/NOPB

Giải thích chi tiết về linh kiện	75V Constant On-Time PFET Buck Switching Controller

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LM5085

PGATE

GND

COUT

RFB2

RFB1

VOUT

GND

R4 =

VRIP(min)

IOR(min)

LM5085

PGATE

GND

Cff

COUT

RFB2

RFB1

VOUT

GND

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

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