FSL518APG datasheet(19/27 Pages) ONSEMI

19 / 27 page

FSL518H, FSL538H, FSL518A, FSL538A

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Figure 42. Timing Chart of AOCP

LEB+ tAOCP

VCC

Stop

switching

IDRAIN

CC− HVREG

Stop

switching

Protection

ILIM

VCC−STOP

tAR

FSL5x8H: 1 pulse

FSL5x8A: 2 pulses

Brown−in, Brown−out (BI/BO) and Line Over-Voltage

Protection (LOVP)

When a voltage divider is connected between LINE pin

and input bulk capacitor, line-detection function is enabled

and VLINE reflects peak of AC input voltage. If VLINE is

below VLINE-BI after initial setting, switching operation will

not be initiated until VLINE reaches VLINE-BI. If VLINE is

lower than VLINE-BO for tBO during normal operation,

brown-out will be triggered and the controller will go into

protection mode. If VLINE is higher than VLINE-OVP,

switching operation is halted until VLINE drops down below

VLINE-OVP-RECOVER. Both recovering from LOVP or after

BI, the controller performs a soft start sequence.

Figure 43. LOVP, Brown-out and Brown-in Behavior

VLINE

IDRAIN

VBULK

VCC

tSS

VLINE−BO

VLINE−OVP

tLINE−OVP

VCC HVREG

tSS

tBO

tAR

tSET

VLINE−BI

VLINE−OVP−RECOVER

tBO

tSET

−

Thermal Shutdown (TSD)

Since SENSEFET and controller are integrated in the

same package, it is easier for the controller to detect

temperature inside the package. When junction temperature

exceeds shut-down temperature, TSD, thermal shutdown is

activated. The controller will go into protection mode after

thermal shutdown. If temperature is not lower than

TRECOVER, switching operation will not be resumed.

FSL518APG Datasheet(PDF) 19 Page - ON Semiconductor

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