RN5RY202A Просмотр технического описания (PDF) - RICOH Co.,Ltd.

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RN5RY202A

VFM STEP-UP DC/DC CONVERTER CONTROLLER

RICOH Co.,Ltd. 

NOTES ON OUTPUT VOLTAGE SETTINGS

R2

I2

VOUT

IIC

RIC

R3

I3

GND

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 :

R2 × IIC=R2 × 2.0/RIC

=2.0 × R2/RIC......................................................................(7)

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

RN5RY202

9

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