UC3655

CMOS IC

UNISONICTECHNOLOGIESCO.,LTD

6 of 9

www.unisonic.com.tw

QW-R502-280.F



OPERATIONAL EXPLANATION

CE / MODE Pin Function

When a low level signal is input to the CE/MODE pin the operation of the UC3655 series will enter into the shut down

mode. In this mode, the current consumption occurs only in the detector and is 0 μA (TYP.), with a state of high

impedance at the Lx pin and VOUT pin. By inputting a high level signal to the CE/MODE pin the IC starts its

operation. The input of the CE/MODE pin is a CMOS input and its sink current is 0 μA (TYP.).

UC3655

series - Examples of how to use CE/MODE pin

R1

CE/MODE

SW_CE

SW_CE

STATUS

ON

Stand-by

OFF

Operation

SW_CE

STATUS

ON

Operation

OFF

Stand-by

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FUNCTIONS

CE/MODE

VOLTAGE LEVEL

OPERATION

H Level

Synchronous PWM/PFM Automatic Switching Control

M Level

L Level

0V≦L Level≦0.3V

Stand-by