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■BLOCK DIAGRAM

V

IN

AV

SS

V

OUT

L1

L

X

L2

CE

PV

SS

V

IN

AV

SS

V

OUT

L1

L

X

L2

CE

PV

SS

V

IN

AV

SS

FB

L1

L

X

L2

CE

PV

SS

1)XCL208A / XCL209A Type

2) XCL208B / XCL209B Type

3)XCL208F / XCL209F Type

NOTE:

The XCL208 offers a fixed PWM control, a signal from CE Control Logic to PWM/PFM Selector is fixed to "L" level inside. The XCL209 control

scheme is PWM/PFM automatic switching, a signal from CE Control Logic to PWM/PFM Selector is fixed to "H" level inside. The diodes placed

inside are ESD protection diodes and parasitic diodes.