WS3241 datasheet(6/8 Pages) ETC2

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WS3241 ProductDescription

voltage spike on the current sense resistor at initial

MOSFET on state. The typical value of lead edge blanking is

500ns. The current limit comparator is disabled and thus

cannot turn off the internal MOSFET.

PFM Control improves the EMI performance

WS3241 uses the PFM control method, which can

improve the system performance. Because PFM belongs to

frequency conversion control, built-in spread spectrum

function.

Over Voltage Protection

WS3241 has a built-in over voltage protection circuit.

When the LED open, the output voltage increased cycle by

cycle, secondary demagnetization time induced. When the

secondary demagnetization time is less than 5us, the over

voltage protection will be triggered.

Minimum off time

WS3241 integrates the minimum off time control, the

typical value is 3.6us. It prevents the interference on the chip

operation voltage caused by the burrs of the switch off,

especially when

larger

leakage

inductance

the

transformer and lower output voltage.

Pin Floating Protection

In WS3241, pin floating phenomenon will not cause

damage to the system.

Automatic restart protection

In WS3241, protection is locked when a certain

protection is triggered, while the switching stops, intering

restart delay mode. Here the VDD voltage is oscillates

between 5.3V and 5.8V, and entering into normal start mode

after 64 cycles. After start up, it works and confirms whether

the protection is removed. If the protection is not removed,

the chip will enter into protection latch state, and repeat

delay to restart, until the protection is released.

Soft Driver of Internal Power MOSFET

WS3241 has a built-in soft driver, improving the EMI

performance, realizing a balance between the efficiency, the

reliability and the EMI.

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