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R1173H421B Datasheet(PDF) 8 Page - RICOH electronics devices division |
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R1173H421B Datasheet(HTML) 8 Page - RICOH electronics devices division |
8 / 33 page R1173x 8 Technical Notes on Output Voltage Setting of Adjustable Output type (R1173x001x) GND ADJ RIC R3 IIC I2 I3 R2 1.0V VOUT VOUT The Output Voltage may be adjustable for any output voltage between its 1.0V reference and its VDD setting level. An external pair of resistors is required, as shown above. The complete equation for the output voltage is described step by step as follows; I2 =IIC+I3 .....................................................................................................................................(1) I3 =1.0/R3...................................................................................................................................(2) Thus, I2 =IIC+1.0/R3..............................................................................................................................(3) Therefore, VOUT =1.0+R2×I2.........................................................................................................................(4) Put Equation (3) into Equation (4), then VOUT =1.0+R2(IIC+1.0/R3) =1.0(1+R2/R3)+R2×IIC........................................................................................................(5) In 2nd term, or R2 ×IIC will produce an error in VOUT. In Equation (5), IIC =1.0/RIC ..................................................................................................................................(6) R2 ×IIC=R2×1.0/RIC =1.0×R2/RIC .....................................................................................................................(7) For better accuracy, choosing R2 (<<RIC) reduces this error. R1173x001x 0.8 1.4 1.2 1.0 2.0 1.8 1.6 -50 -25 25 75 50 0 100 Temperature Topt ( °C) ∗) The graph is a typical characteristic , please evaluate the circuit with an actual condition. |
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