WS2268SP datasheet(7/8 Pages) WINSEMI

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WS2268

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Toffs

Tons

The relationship between the output constant-current Iout

and secondary peak current Ipks is given by:

Toffs

Tons

Ipks

Iout

At the instant of D1 turn-on, the primary current transfers to

the secondary at an amplitude of:

Ipk

Ipks

Thus the output constant-current is given by:

Ipk

Toffs

Tons

Ipk

Iout

5. Leading Edge Blanking

When the power switch is turned on, a turn-on spike will

occur on the sense-resistor. To avoid false-termination of the

switching pulse, a 430ns leading-edge blanking is built in.

During this blanking period, the current sense comparator is

disabled and the gate driver can not be switched off.

6. CCM Protection

The WS2268 is designed to operate in discontinuous

conduction mode (DCM) in both CV and CC modes. To

avoid operating in continuous conduction mode (CCM),

the WS2268 detects the falling edge of the U input

voltage on each cycle. If a 0.1V falling edge of U is not

detected, the WS2268 will stop switching.

7. OVP & OCkP

WS2268 include output over-voltage protection (OVP)

and open circuit protection (OckP) circuitry. If the voltage

at U pin exceeds 8V, 100% above the normal detection

voltage, or the -1V falling edge of U input can not be

monitored, the WS2268 will immediately shut off and

enter hiccup mode. The WS2268 sends out a fault

detection pulse every 19ms in hiccup mode until the fault

has been removed.

WS2268SP датащи(PDF) 7 Page - Shenzhen Winsemi Microelectronics Co., Ltd

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