Datasheet > LNK456DG-TL

LNK456DG-TL

更新时间： 2022-11-14 09:20:43

品牌	Logo	应用领域
帕沃英蒂格盛 - POWERINT		驱动器三端双向交流开关功率因数校正
页数	文件大小	规格书
20页	1798K
描述
LED Driver IC with TRIAC Dimming, Single-Stage PFC and Constant Current Control for Non-Isolated Applications

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数据手册

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LNK456DG-TL 数据手册

LNK454/456-458/460

D_ES

DZ_OV

R_OV

R_ES

LinkSwitch-PL

CONTROL

C_F

R_F

R_SENSE

PI-5837-060710

Figure 4. Typical Application Schematic.

Functional Description

Auto-restart protection is triggered by a FEEDBACK pin voltage

in excess of 2 V. This feature can be used to provide output

overvoltage protection (via DZ_OVand R_OV, in Figure 4), which

triggers the IC to enter auto-restart.

The LinkSwitch-PL combines a high-voltage power MOSFET

switch with a power supply controller in one device. The IC

provides a single stage power factor correction plus LED

current control. The LinkSwitch-PL controller consists of an

oscillator, feedback (sense and logic) circuit, 5.85 V regulator,

hysteretic over-temperature protection, frequency jittering,

cycle-by-cycle current limit, loop compensation circuitry, auto-

restart, switching on-time extension, power factor and constant

current control.

Auto-Restart

In a direct LED current sensing conﬁguration, the average

FEEDBACK pin voltage is a replica of the LED current, scaled

by the sense resistor (R_SENSEin Figure 4). A small low-pass ﬁlter

(R_Fand C_Fin Figure 4) reduces high frequency noise at the

FEEDBACK pin.

2 V

Cycle Skipping

Mode

Figure 5 illustrates the operating regions of the FEEDBACK pin

voltage. The LinkSwitch-PL sets its operating point such that

the average FEEDBACK pin voltage in steady-state operation is

290 mV. This threshold is set low to minimize the sensing

resistor dissipation. The internal MOSFET switching frequency

and on-time are updated once every input AC half-cycle to

regulate the output current and maintain high power factor.

520 mV

Normal Operation

If the FEEDBACK pin peak voltage exceeds 520 mV, cycle

skipping mode is triggered and the power processed by the

integrated power MOSFET is clamped on a cycle-by-cycle

basis. Switching frequency may vary during an input voltage

half-cycle to reduce thermal stress on the output LEDs.

290 mV

PI-5838-091010

Figure 5. FEEDBACK Pin Operational Voltage Thresholds.

www.powerint.com

Rev. A 11/01/10

1 234 5 6 7...20

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