WS3411 Datasheet PDF ( Pinout ) - Active PFC Non-isolated Buck LED Driver

WS3411 Datasheet PDF - WINSEMI

Part Number	*WS3411*
Description	Active PFC Non-isolated Buck LED Driver
Manufacturers	WINSEMI
Logo
There is a preview and WS3411 download ( pdf file ) link at the bottom of this page. Total 8 Pages

Preview 1 page

No Preview Available ! WS3411 datasheet, circuit

WS3411 Product Description

WS3411 Active PFC Non-isolated Buck LED Driver

Features

� High Power Factor Correction, Low Total

Harmonic Distortion

� Dynamic Temperature Compensation

� 500V Power MOSFET Integrated

� No Auxiliary Winding For Supplying

� SOP8 Package, Up To 260mA Output Current

� Valley Switching, High efficiency, Low EMI

� Automatic Compensate the Inductance Variation

� Automatic Adapt to the Change of Output Voltage

� LED Short Circuit Protection

� Over Voltage Protection

� Over Temperature Protection

� Open Circuit Protection

� Few External Components

Applications

� LED Driver Supply

General Description

The WS3411 is designed for active PFC non-isolated buck

LED driver. It operates at valley switching mode with high

efficiency, low EMI and High PF. The output current

automatically adapt to the variation of the inductance and the

output voltage. The truly constant current LED is realized.

The WS3411 integrates 500V power MOSFET, using SOP8

package, producing up to 260mA output current.

It can achieve excellent constant current performance with

very few external components.

The WS3411 offers rich protection functions, including over

voltage protection, LED short circuit protection, cycle by

cycle current limiting, dynamic temperature compensation,

over temperature protection and soft start.

WS3411 consumes very low start current and operation

current, driving LED efficiently under universal AC

input(85VAC~265VAC).

WS3411 is available in SOP8 package.

Typical Application Circuit

CS 7

3 VCC

FB 4

2 GND

COMP 1

LE D+

LE D-

WIN SEM I M ICROELECTRON ICS

W/T-D046-Rev.A/ 0 May.2014

WIN SEM I M ICROELECTRON ICS

0514

WS3411 Product Description

Function Description

The WS3411 is designed for active PFC non-isolated buck

LED driver, which integrates 500V power MOSFET and

using SOP8 package, producing up to 260mA output current.

It operates under valley switching mode, automatically

adapting to the variation of the inductance and the output

voltage. It can achieve excellent constant current

performance with very few external components.

Start up

The start current is very low, Typ. 70uA(Max. 100uA). Under

the design system of 85VAC, the startup resistor is:

R = 85 * 2 = 1.2M

100

Chip Supply

After startup, the output voltage should supply the chip,

rectifier diodes D6 need to use fast recovery diodes.Current

limiting resistor R4 is calculated as:

(1 −

)D * VLED − 9

400uA

Where, D is duty cycle, 400uA is the normal operation

current of the chip, Vled is output load voltage. The

consumption of R4 is:

PR 4

(VLED − 9)2

* (1 −

Sence Resistor

The WS3411 is designed for active PFC non-isolated buck

LED driver. It operates under valley switching mode and

can achieve high accuracy constant current performance

with very few external components. The peak current of

inductor is continuous detected. CS terminal is connected

internal of the chip, and compared with the internal 200mV.

Internal Amplifier’s output COMP adjust the on-time, making

the average value so CS equal to 200mV after the system is

stable. In addition, a 1V cycle-by-cycle over current

protection is set up inside CS pin.

LED output current:

I LED

0.2V

RCS

FB Voltage Detection

FB voltage determines the working status of the system,

when FB is greater then 1.6V(typ.), WS3411 will

automatically considered as output over voltage protection.

The system will enter extremely energy efficient hiccup

mode. Output over voltage protection voltage as follows:

VOVP

= 1.6 * R2 + R3

R2,R3,please refer to the typical application diagram, in

which R3=1k(no more than 2k). use 1.3 instead of constant

1.6 in the above formula in the design of system. Assuming

Vovp=90V, we got R2=56k from the above formula,

For example:

choosing 60k for R2 (larger as far as possible).

Requirements:180~260V input voltage, 36~80V output,

Because VFB2 is between 1.3 and 1.9, choose 1.9 to

240mA output current.

calculate the withstand voltage of C4,

The R4 design of above program should be met:

Vovp=1.9*(1+60)/1=116V

1. Supply Problem when Min. input AC voltage 180V and

The withstand voltage of C4 shoule larger than the above

Min. output voltage 36V(which is the weakest power supply):

value, 200V capacitor could be used.

D=36/180/1.414=0.141,R4=(1-0.141)*(36-9)/400uA=58k

The WS3411 uses the patent source driver structure. The

2.Power consumption problem of R4 when Max. input AC

typical operation current is as low as 200uA, the auxiliary

voltage 260V and Max. output voltage 80V(which is the

winding is not need. So the system design is simple and the

strongest power supply):

cost is low.

D=80/260/1.414=0.218

WS3411 will automatic detect the output voltage when

The power consumption of R4:

enters hiccup mode; and will re-enter the normal working

P=(80-9)*(80-9)/58*(1-0.218)=68mW

state when the output voltage is lower than Vovp.

WIN SEM I M ICROELECTRON ICS

www.winsemi.com Tel : +86-755-8250 6288 Fax : +86-755-8250 6299

WIN SEM I M ICROELECTRON ICS

5/8

Preview 5 Page

Part Details

On this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for WS3411 electronic component.

Information	Total 8 Pages
Link URL	[ Copy URL to Clipboard ]
Download	[ WS3411.PDF Datasheet ]

Share Link :

Electronic Components Distributor

An electronic components distributor is a company that sources, stocks, and sells electronic components to manufacturers, engineers, and hobbyists.

SparkFun Electronics	Allied Electronics	DigiKey Electronics	Arrow Electronics
Mouser Electronics	Adafruit	Newark	Chip One Stop

Featured Datasheets

Part Number	Description	MFRS
WS3410	The function is Active PFC Non-isolated Buck LED Driver. WINSEMI
WS3411	The function is Active PFC Non-isolated Buck LED Driver. WINSEMI
WS3411H	The function is Non-isolated Buck APFC Offline LED Driver. WINSEMI
Semiconductors commonly used in industry: 1N4148 \| BAW56 \| 1N5400 \| NE555 \| LM324 \| BC327 \| IRF840 \| 2N3904 \|
Quick jump to: WS34 1N4 2N2 2SA 2SC 74H BC HCF IRF KA LA LM MC NE ST STK TDA TL UA

What is WS3411?

WS3411 Datasheet PDF - WINSEMI

Part Details

Electronic Components Distributor

Featured Datasheets