LM2735XMFSLASHNOPB datasheet(45/59 Pages) TI

部件名	LM2735XMF/NOPB

功能描述	LM2735-xx 520-kHz and 1.6-MHz Space-Efficient Boost and SEPIC DC-DC Regulator

PDF	59 Pages

Scroll/Zoom	100%

制造商	TI [Texas Instruments]

网页	http://www.ti.com

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45 / 59 page

LM2735, LM2735-Q1

www.ti.com

SNVS485G – JUNE 2007 – REVISED AUGUST 2015

10.3.4.1 Example Efficiency Calculation

Table 3. Operating Conditions

PARAMETER

VALUE

VIN

5 V

VOUT

12 V

IOUT

500 mA

0.4 V

FSW

1.60 MHz

4 mA

TRISE

6 nS

TFALL

5 nS

RDSon

250 m

Ω

RDCR

50 m

Ω

0.64

IIN

1.4 A

ΣPCOND + PSW + PDIODE + PIND + PQ = PLOSS

(48)

Quiescent Power Losses:

PQ = IQ × VIN = 20 mW

(49)

Switching Power Losses:

PSWR = 1/2(VOUT × IIN × FSW × TRISE) ≊ 6 ns ≊ 80 mW

(50)

PSWF = 1/2(VOUT × IIN × FSW × TFALL) ≊ 5 ns ≊ 70 mW

(51)

PSW = PSWR + PSWF = 150 mW

(52)

Internal NFET Power Losses:

RDSON = 250 mΩ

(53)

PCONDUCTION = IIN

2 × D × R

DSON × 305 mW

(54)

Diode Losses:

VD = 0.45 V

(55)

PDIODE = VD × IIN(1–D) = 236 mW

(56)

Inductor Power Losses:

RDCR = 75 mΩ

(57)

PIND = IIN

2 × R

DCR = 145 mW

(58)

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