XC6216 datasheet(21/43 Pages) TOREX

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XC6216/XE6216

Series

The output voltage can be set externally by the following equation:

I21=IFB+I22

………………………………………………………………………

(1)

I22=2.0V/R22

………………………………………………………………………

(2)

I21=IFB+2.0V/R22

………………………………………………………………………

If the equation (3) is assigned to the equation (2), the equation becomes as below:

VOUT=2.0V+R21・I21

………………………………………………………………………

(3)

For this, the following equation can be used for setting output voltage externally:

VOUT=2.0V+R21・I21

………………………………………………………………………

(4)

And the equation (4) will be;

VOUT=2.0V+R21 ・(IFB+2.0V/R22)

………………………………………………………………………

=2.0V・(R21 + R22) / R22 + R21・IFB

………………………………………………………………………

(5)

The second term of the equation (6), R21・IFB, is the cause of the output accuracy error.

The IFB can be calculated by the following equation:

IFB=2.0V / RFB

………………………………………………………………………

(6)

The cause of the output accuracy error, R21・IFB can be calculated by the equation below;

R21･IFB=R21・2.0V/ RFB

=2.0V・R21 / RFB

………………………………………………………………………

(7)

Accordingly, if R21<< RFB, the output voltage error becomes minute.

1． Please use this IC within the stated absolute maximum ratings. The IC is liable to malfunction should the ratings be

exceeded.

2． Where wiring impedance is high, operations may become unstable due to the noise and/or phase lag depending on output

current. Please strengthen VIN and VSS wiring in particular.

3. Phase compensation inside the IC is performed in the XC6216/XE6216 series. Therefore, an abnormal oscillation does not

occur even if there is no output capacitor CL. An input capacitor CIN around 0.1uF~1.0uF between the VIN pin and the

VSS pin is required for input stability. Also, the output voltage fluctuation such as under shoot or over shoot, which occurs

because of the load change can be controlled by placing the output capacitor CL around 0.1uF~1.0uF between the VOUT

pin and VSS pin. The input capacitor (CIN) and the output capacitor (CL) should be placed to the IC as close as possible

with a shorter wiring.

4. Notes on Setting Output Voltage Externally (C type) Ta=25℃

■

NOTES ON USE

●

Setting Resistance-Dependant of XC6216 Series’ Output Voltage

XC6216 Datasheet(PDF) 21 Page - Torex Semiconductor

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