WS3441 - Non-isolated Buck Offline LED Driver

부품번호

WS3441 기능

기능

Non-isolated Buck Offline LED Driver

제조업체

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WS3441 ProductDescription

Features

 Critical Conduction Mode Operation

 Internal 500V Power MOSFET

 No Auxiliary Winding

 Ultra Low Operating Current

 ±3% LED Output Current Accuracy

 Efficiency up to 93%

 LED Open Protection

 LED Short Protection

 Current Sensing Resistor Short Protection

 Thermal Regulation Function

 Available in SOP-8 Package and DIP-7 Package

Applications

 LED Candle Light

 LED Bulb, Spot Light

 T8/T10 LED String

 Other LED Lighting

Typical Application(SOP-8 Package)

Non-isolated Buck Offline LED Driver

Description

The WS3441 is a high precision buck constant current

LED driver. The device operates in critical conduction mode

and is suitable for 85Vac~265Vac universal input offline LED

lighting.

The WS3441 integrates a 500V power MOSFET. The

operating current of the IC is very low. So it doesn’t need the

auxiliary winding for supplying the chip. It can achieve

excellent constant current performance with very few external

components, so the system cost and size are minimized.

The WS3441 utilizes patent pending current control

method. It can achieve precise output current and excellent

line regulation. The driver operates in critical conduction

mode, the output current does not change with the inductance

and LED output voltage.

The WS3441 offers rich protection functions to improve

the system reliability, including LED open circuit protection,

LED short circuit protection, VCC under voltage protection,

CS resistor short circuit protection and thermal regulation

function.

The WS3441 is available in SOP-8 Package and DIP-7

Package.

Attention：A 22pF capacitor can be parallel with Rovp and a resistor can be parallel with the Vcc capacitor.

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WS3441 ProductDescription

Absolute Maximum Ratings

symbol

paramete

Range

unit

VDS

Internal HV MOSFET drain voltage

-0.3~500

ICC_MAX

VCC pin maximum sink current

2.5 mA

VROVP

Over-voltage setting pin voltage

-0.3~7

VSOURCE

Internal HV MOSFET source voltage

-0.3~8

VCS

Current sense pin input voltage

-0.3~7

PDMAX

Power dissipation SOP8

0.6 W

PDMAX

Power dissipation DIP7

0.9 W

Operating junction temperature

165 ℃

TSTG

Storage temperature range

-55~165

℃

Note : Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device.

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WS3441 ProductDescription

And then the Rovp resistor value can be calculated by

the equation:

Rovp  3.3*Tovp *106 （kohm）

Protection Function

The WS3441 offers rich protection functions to improve

the system reliability, including LED open/short protection,

CS resistor short protection, VCC under voltage protection,

thermal regulation. When the LED is open circuit, the

system will trigger the over voltage protection and stop

switching.

When the LED short circuit is detected, the system

works at low frequency (5kHz), and the CS pin turn off

threshold is reduced to 200mV. So the system power

consumption is very low. At some catastrophic fault

condition, such as CS resistor shorted or inductor saturated,

the internal fast fault detection circuit will be triggered, the

system stops switching immediately.

After the system enters into fault condition, the VCC

voltage will decrease until it reaches the UVLO threshold,

then the system will re-start again. If the fault condition is

removed, the system will recover to normal operation.

Thermal Regulation

The WS3441 integrates thermal regulation function.

When the system is over temperature, the output current is

gradually reduced; the output power and thermal dissipation

are also reduced. The system temperature is regulated and

the system reliability is improved. The thermal regulation

temperature is set to 150℃ internally.

PCB Layouts

The following rules should be followed in WS3441 PCB

layout:

Vcc Capacitor

The bypass capacitor on VCC pin should be as close as

possible to the VCC Pin and GND pin.

ROVP Pin

The ROVP resistor should be as close as possible to

the ROVP Pin.

Ground Path

The power ground path for current sense should be

short, and the power ground path should be separated from

small signal ground path before connecting to the negative

node of the bulk capacitor.

The Area of Power Loop

The area of main current loop should be as small as

possible to reduce EMI radiation, such as the inductor, the

power MOSFET, the output diode and the bus capacitor

loop.

NC pin

The NC pin should be connected to GND (pin1).

Drain Pin

To increase the copper area of DRAIN pin for better

thermal dissipation. However too large copper area may

compromise EMI performance.

The material of PCB

Avoid choosing the material that is easy to absorb the

moisture, just like paper copper-clad laminates.

www.wWiInNSsEeMmI iM.cICoROmELECTTReOlN:IC+S86-7W5I5N-S8EM2I50M6IC2R8O8ELECTROFNaICxS:

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사이트 맺음말

부품번호	상세설명 및 기능	제조사
WS3440	Constant Current Controller	WINSEMI
WS3441	Non-isolated Buck Offline LED Driver	WINSEMI