RN5RY202C-TL datasheet(9/9 Pages) RICOH

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RN5RY202C-TL Datasheet(PDF) 9 Page - RICOH electronics devices division

Part #	RN5RY202C-TL

Description	VFM STEP-UP DC/DC CONVERTER CONTROLLER

Download	9 Pages

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Manufacturer	RICOH [RICOH electronics devices division]

Direct Link	http://www.ricoh.com

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NOTES ON OUTPUT VOLTAGE SETTINGS

RN5RY202

VOUT

RIC

GND

IIC

2.0V

VOUT

Output setting voltage is determined using the following formulas :

I2=IIC+I3 ..........................................................................................(1)

I3=2.0/R3 ........................................................................................(2)

From (1) and (2) above,

I2=IIC+2.0/R3..................................................................................(3)

VOUT=2.0+R2

× I2............................................................................(4)

By substituting (3) into the above formula

VOUT=2.0+R2

× (IIC+2.0/R3)

=2.0

× (1+R2/R3)+R2× IIC ....................................................(5)

The second term, R2

× IIC in the formula (5) above may cause a voltage setting error.

Here, consider the formula in terms of IIC,

IIC=2.0/RIC .....................................................................................(6)

then R2

× IIC that causes the error will be as shown below :

× IIC=R2× 2.0/RIC

=2.0

× R2/RIC......................................................................(7)

Thus, when R2<<RIC the error can be minimized.

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