Datasheet > LT1614

LT1614

更新时间： 2023-12-20 18:46:25

品牌	Logo	应用领域
亚德诺 - ADI		开关稳压器
页数	文件大小	规格书
16页	266K
描述
负输出 600kHz 开关稳压器

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LT1614 数据手册

LT1614

OPERATIO

When Q1 turns off during the second phase of switching,

theSWXnodevoltageabruptlyincreasesto(V_IN+|V_OUT|).

TheSWnodevoltageincreasestoV_D(about350mV).Now

current in the first loop, begining at C1, flows through L1,

C2, D1 and back to C1. Current in the second loop flows

from C3 through L2, D1 and back to C3. Load current

continues to be supplied by L2 and C3.

rents are dumped into the ground plane as drawn in

Figures 4, 5 and 6. This single layout technique can

virtually eliminate high frequency “spike” noise so often

present on switching regulator outputs.

Output ripple voltage appears as a triangular waveform

ridingonV_OUT. Ripplemagnitudeequalstheripplecurrent

of L2 multiplied by the equivalent series resistance (ESR)

of output capacitor C3. Increasing the inductance of L1

and L2 lowers the ripple current, which leads to lower

output voltage ripple. Decreasing the ESR of C3, by using

ceramic or other low ESR type capacitors, lowers output

ripple voltage. Output ripple voltage can be reduced to

arbitrarily low levels by using large value inductors and

low ESR, high value capacitors.

An important layout issue arises due to the chopped

natureofthecurrentsflowinginQ1andD1.Iftheyareboth

tied directly to the ground plane before being combined,

switching noise will be introduced into the ground plane.

Itisalmostimpossibletogetridofthisnoise,oncepresent

in the ground plane. The solution is to tie D1’s cathode to

the ground pin of the LT1614 before the combined cur-

–(V

OUT

)

CESAT

SWX

–V

OUT

LOAD

1614 F05

Figure 5. Switch-On Phase of Inverting Converter. L1 and L2 Current Have Positive dI/dt

+ V

OUT

SWX

–V

OUT

LOAD

1614 F06

Figure 6. Switch-Off Phase of Inverting Converter. L1 and L2 Current Have Negative dI/dt

1...4 5 678 9 10...16

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