Electronic Components Datasheet Search |
|
R1155H075B-TR-FE Datasheet(PDF) 11 Page - RICOH electronics devices division |
|
R1155H075B-TR-FE Datasheet(HTML) 11 Page - RICOH electronics devices division |
11 / 26 page R1155x NO.EA-270-150702 11 Adjustable Output Voltage Type Setting (R1155x001C) The output voltage of the R1155x001C can be adjusted up to 23 V by using the external divider resistors (R1, R2). The resistance value for R2 should be set to 24 MΩ or less. By using the following equations, the output voltage can be determined. VFB voltage which is fixed inside the IC is described as setVFB. setVFB is 2.5 V. When using the R1155x001C with 2.5 V, please connect the VOUT pin to the VFB pin. GND VOUT VFB RIC R2 IIC I1 I2 R1 setVFB VOUT Output Voltage Adjustment Using External Divider Resistors I1 = IIC + I2.......................................................................................................................................(1) I2 = setVFB / R2................................................................................................................................(2) Thus, I1 = IIC + setVFB / R2......................................................................................................................... (3) Therefore, VOUT = setVFB + R1 x I1.................................................................................................................... (4) Insert Equation (3) into Equation (4), so VOUT = setVFB + R1 x (IIC + setVFB / R2) = setVFB x (1+ R1 / R2) + R1 x IIC ............................................................................................ (5) In Equation (5), R1xIIC is the error-causing factor in VOUT. As for IIC, IIC = setVFB / RIC…………………………………………………………………………………………………………………………………………………(6) Therefore, the error-causing factor R1x IIC can be described as follows. R1 x IIC = R1 x setVFB / RIC = setVFB R1 / RIC .............................................................................................................. (7) For better accuracy, choosing R1 (<<RIC) reduces this error. Without the error-causing factor R1x IIC, the output voltage can be calculated by the following equation. VOUT = setVFB ((R1 + R2) / R2) ..................................................................................................... (8) RIC of the R1155x001C is approximately Typ.8.4 MΩ (Ta = 25 °C, guaranteed by Design Engineering). RIC could be affected by the temperature, therefore evaluate the circuit taking the actual conditions of use into account when deciding the resistance values for R1 and R2. |
Similar Part No. - R1155H075B-TR-FE |
|
Similar Description - R1155H075B-TR-FE |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.COM |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |