Datasheet > LNK362-364

LNK362-364

更新时间： 2022-04-23 23:00:11

品牌	Logo	应用领域
帕沃英蒂格盛 - POWERINT		开关
页数	文件大小	规格书
16页	913K
描述
Energy Efficient, Low Power Off-Line Switcher IC

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LNK362-364 数据手册

LNK362-364

Optocoupler

2. Maximumdraincurrent–Atmaximumambienttemperature,

maximum input voltage and peak output (overload) power,

verify drain current waveforms for any signs of transformer

saturation and excessive leading-edge current spikes at

startup. Repeat under steady state conditions and verify that

theleading-edgecurrentspikeeventisbelowI_LIMIT(MIN)atthe

endofthet_LEB(MIN). Underallconditions, themaximumdrain

current should be below the speciﬁed absolute maximum

ratings.

3. Thermal Check – At speciﬁed maximum output power,

minimuminputvoltageandmaximumambienttemperature,

verify that the temperature speciﬁcations are not exceeded

for LinkSwitch-XT, transformer, output diode and output

capacitors. Enough thermal margin should be allowed for

part-to-part variation of the R_DS(ON)of LinkSwitch-XT as

speciﬁedinthedatasheet.Underlowline,maximumpower,

a maximum LinkSwitch-XT SOURCE pin temperature of

105 °C is recommended to allow for these variations.

Place the optocoupler physically close to the LinkSwitch-XT to

minimize the primary-side trace lengths. Keep the high current,

high voltage drain and clamp traces away from the optocoupler

to prevent noise pick up.

Output Diode

For best performance, the area of the loop connecting the

secondary winding, the output diode and the output ﬁlter

capacitor should be minimized. In addition, sufﬁcient copper

area should be provided at the anode and cathode terminals

of the diode for heat sinking. A larger area is preferred at the

quiet cathode terminal. A large anode area can increase high

frequency radiated EMI.

Quick Design Checklist

As with any power supply design, all LinkSwitch-XT designs

should be veriﬁed on the bench to make sure that component

speciﬁcationsarenotexceededunderworst-caseconditions.The

following minimum set of tests is strongly recommended:

Design Tools

Up-to-date information on design tools can be found at the

Power Integrations web site: www.powerint.com.

1. Maximum drain voltage – Verify that V_DSdoes not exceed

650Vatthehighestinputvoltageandpeak(overload)output

power. The 50 V margin to the 700 V BV_DSSspeciﬁcation

gives margin for design variation, especially in Clampless

designs.

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