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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LNK4323D-TL 数据手册

LinkSwitch-4

into Sleep mode, reducing its current consumption to I_VCC(SLEEP). The

control circuitry will re-initialize if the input voltage is restored and

Functional Description

Power-Up/Power-Down Sequences

V_VCCreaches V_VCC(RUN)

Refer to Figure 10 and Figure 7. When mains input voltage (V_IN) is

applied, current ﬂows through the start-up resistors (R_HT) and BJT.

Some of this current ﬂows into the LinkSwitch-4 internal circuits,

ꢀ_{ꢀꢁꢁꢂRꢃꢄꢅ}

which are in Sleep mode; the remainder charges capacitor C_VCC

As soon as the VOLTAGE SUPPLY pin voltage rises to V_VCC(RUN), the

LinkSwitch-4 changes to Initialise mode. Current consumption

increases to I_VCC(RUN)while internal circuits are enabled. The emitter

switch is held at low impedance to ground (GND) and a short drive

pulse is output on the BASE DRIVE pin, during which time the voltage

at feedback is held at GND potential by current sourced from the

FEEDBACK pin. This enables the LinkSwitch-4 control circuit to

compare the rectiﬁed mains input voltage with thresholds for allowing

or preventing the next stage of power-up. If the input voltage is too

low (I_FB<I_FBHT(START)), the LinkSwitch-4 will not issue further drive

pulses, the VCC voltage will discharge to V_VCC(SLEEP), and the power-up

sequence will repeat. If the mains input voltage is high enough (I_FB>

I_FBHT(START)), the LinkSwitch-4 will enter Run mode and drive pulses will

be output on the BASE DRIVE pin. To achieve smooth power-up

(monotonic rise in V_OUT), C_VCCmust be large enough to power the

control circuitry during Initialize mode and the ﬁrst few cycles of Run

mode, until sufﬁcient power is provided by the transformer voltage

supply winding.

ꢀ_ꢀꢁꢁ

ꢀ_{ꢀꢁꢁꢂꢆꢇꢈꢈꢉꢅ}

ꢊꢋꢋ

ꢆꢌeeꢍ

ꢎꢏꢐꢑꢐꢒꢌꢐꢓe

Rꢔꢏ

ꢆꢌeeꢍ ꢊꢋꢋ

ꢉꢎꢕꢖꢗ5ꢖꢕ010815

Figure 7. VCC Waveforms.

If the input voltage falls below V_MAINS(LO)(see Input Undervoltage

Protection), V_VCCwill fall below V_VCC(SLEEP)and the LinkSwitch-4 will go

Mode

Description

From initial application of input power or from Run mode, if V_VCCfalls below V_VCC(SLEEP), the LinkSwitch-4 goes to Sleep mode.

Non-essential circuits are turned off. Base and Emitter drives are turned off so BASE DRIVE and EMITTER DRIVE pins

become high impedance, allowing the bootstrap resistor (R_HT) and BJT to start the circuit. Sleep mode is exited when V_VCC

rises to V_VCC(RUN)and the control circuitry goes to Initialize mode.

Sleep

Internal circuits are enabled and the LinkSwitch-4 issues one switching cycle to sample the input voltage via the FEEDBACK

pin. If V_IN(hence V_HT) is high enough, the LinkSwitch-4 changes to Run mode. If V_INis not high enough, no further base drive

Initialize

pulses are issued and the LinkSwitch-4 returns to Sleep mode when V_VCCfalls below V_VCC(SLEEP)

Power conversion: The control circuitry is powered from the VCC rail and the internal V_DDis regulated. If V_VCCfalls below

V_VCC(SLEEP), the IC ceases power conversion and goes to Sleep mode.

Run

Table 2.

Summary of LinkSwitch-4 Operating Modes.

Rev. F 05/18

www.power.com

1 2 345 6 7...22

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