SS6639 데이터 시트보기 (PDF) - Silicon Standard Corp.

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SS6639

1-Cell, 3-Pin, Step-Up DC/DC Controller

Silicon Standard Corp. 

diode such as the 1N5819. Motorola makes the

MBR0530 for surface mount. For lower output power a

1N4148 can be used although efficiency and start-up

voltage will suffer substantially.

COMPONENT POWER DISSIPATION

Operating in discontinuous mode, the power loss in

the winding resistance of the inductor is approximately

equal to

PDL

=

2 *  TON  * (RS) *  VOUT + VD  * (POUT )

3 L

 VOUT 

SS6639

where POUT=VOUT * IOUT ; RS=Inductor DC R;

VD = Diode drop.

The power dissipated in switching losses is

PDsw = 2 *  TON  * (RON ) * ( ) IOUT * (POUT )

3 L

The power dissipated in the rectifier diode is

PDD =  VD  * (POUT )

 VOUT 

Rev.2.01 6/26/2003

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