Electronic Components Datasheet Search |
|
S-812C26AY-X Datasheet(PDF) 9 Page - Seiko Instruments Inc |
|
S-812C26AY-X Datasheet(HTML) 9 Page - Seiko Instruments Inc |
9 / 26 page Rev.1.0 HIGH OPERATING VOLTAGE CMOS VOLTAGE REGULATOR S-812C Series Seiko Instruments Inc. 9 Application Circuits 1. Output Current Boost Circuit As shown in Figure 11, the output current can be boosted by externally attaching a PNP transistor. The S-812C controls the base current of the PNP transistor so that the output voltage VOUT becomes the voltage specified in the S-812C if the sufficient base- emitter voltage VBE to turn on the PNP transistor is obtained between input voltage VIN and S-812C power source pin VIN. • As the transient response characteristics of the circuit shown in figure 11 is not enough in some applications, evaluation for output variation due to power-on, power line variation and load variation in actual condition is needed before massproduction. • Note that the short-circuit protection incorporated in the S-812C series does not work as a short-circuit protection for the boost circuit. 2. Constant Current Circuit The S-812C series can be served in a constant current circuit as shown in the figure 12. Constant current IO is calculated from the following equation: IO = (VOUT(E) ÷ RL) +ISS, where V OUT(E) is the effective output voltage. Please note that in case of the circuit shown in the figure 12 (1) the magnitude of the constant current IO is limited by the driving ability of the S-812C. The circuit shown in the figure 12 (2) can, however, provide the current beyond the driving ability of the S-812C by combining a constant current circuit with a current boost circuit. The maximum input voltage for the constant current circuit is the sum of the voltage VO of the device and 16 V. It is not recommended to attach a capacitor between the S-812C power source VIN and VSS pins or between output VOUT and VSS pins because rush current flows at power-on. 3. Output Voltage Adjustment Circuit The output voltage can be increased using the configuration shown in the figure 13. The output Voltage VOUT1 can be calculated using the following equation; VOUT1 = VOUT(E) x (R1 + R2) ÷ R1 + R2 x I SS, where VOUT(E) is the effective output voltage. Value of R1 and R2 should be determined so as not to be affected by the current consumption ISS. R1 Tr1 GND VOUT ON/OFF VIN VSS VIN VOUT CL Figure 11 Output Current Boost Circuit S-812C Series CIN I (2) Constant Current Boost Circuit Figure 12 Constant Current Circuits R1 GND Device RL VIN VOUT VIN V0 VSS S-812C Series Tr1 VO GND Device RL VOUT VIN VIN V0 VO IO CIN CIN VSS (1) Constant Current Circuit S-812C Series o ON/OFF ON/OFF |
Similar Part No. - S-812C26AY-X |
|
Similar Description - S-812C26AY-X |
|
|
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 |