Datasheet > LNK4323D-TL

LNK4323D-TL

更新时间： 2022-09-29 19:29:14

品牌	Logo	应用领域
帕沃英蒂格盛 - POWERINT		/
页数	文件大小	规格书
22页	1423K
描述
IC OFF-LINE CNTRLR 10W 8SO

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数据手册

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LNK4323D-TL 数据手册

LinkSwitch-4

If the output does not reach V_OUT(UVP)during this time then the

controller will shutdown and restart.

This allows the BJT emitter voltage to rise until the Schottky diode

conducts. Emitter current then charges the C_VCCuntil the BJT is

turned off by the BASE DRIVE pin being pulled low.

V_OUT(UVP)value depends on the set output voltage (V_OUT(CV)) and the

feedback UVP ratio:

If the supply voltage is above V_VCC(ES), then Easy Start has no effect

on the operation of the controller.

V_{OUT UVP}= V

# G

OUT CV

FB UVP

Note V_VCC(ES)= 6 V for LNK4114D and LNK4214D, V_VCC(ES)= 10 V for

LNK43x3S, LNK43x3D, LNK4115D and LNK4215D during N_STARTUPcycles,

after which it reduces to 6 V.

Easy Start (LNK4114D, LNK4214D, LNK4115D, LNK4215D)

The Easy Start feature guarantees start-up into large output

capacitances and allows the output voltage to work down the CC

chimney close to OV.

Over-Temperature Protection

Temperature protection is internal to LinkSwitch-4. The sensor

measures the junction temperature T_J, which is the hottest part of

LinkSwitch-4.

The Easy Start feature uses the BJT emitter current (equal to the

primary current) to charge the supply capacitor C_VCCvia an additional

Schottky diode.

At temperatures T_J~ 140 °C, LinkSwitch-4 will shutdown and remain

in this state until a temperature of T_J~ 70 °C is reached. Whereby

LinkSwitch-4 will power-up in the normal sequence.

This only occurs when the supply voltage has fallen below V_VCCESand

is achieved by altering the sequencing of EMITTER DRIVE pin switching.

If the supply voltage is below V_VCC(ES), and when the base has received

enough charge, the EMITTER DRIVE pin is released at the same time

as the BASE DRIVE pin.

ꢍ_Fꢇꢈ

ꢁ_Fꢇꢈ

ꢁ_ꢉꢊ

ꢁ_{ꢉꢊꢋRꢌ}

ꢎꢏꢐꢑꢒ ꢉꢊ

ꢎꢏꢐꢑꢒ ꢓꢊ

ꢉꢊ ꢔꢕꢏꢖꢗꢘ

ꢀꢁꢂꢃꢄ5ꢅꢂ0ꢅ0ꢆ15

Figure 9. Base Drive Waveforms.

ꢎ_ꢍꢍ

ꢜ_Fꢈꢉ

ꢁ_Fꢈꢉ

ꢁ_ꢊꢋ

ꢁ_{ꢊꢋꢌRꢍ}

ꢏꢐꢑꢒꢓ ꢊꢋ

ꢏꢐꢑꢒꢓ ꢔꢋ

ꢊꢋ ꢕꢖꢐꢗꢘꢙ

ꢍ_ꢎꢍꢍReꢓꢚꢛꢖꢑe ꢍꢗꢖꢖeꢘꢜ

ꢀꢁꢂꢃꢄꢃꢅꢂ0ꢆ0ꢇ15

Figure 9b. Base Drive Waveforms – Easy Start mode of Operation.

Rev. F 05/18

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