Electronic Components Datasheet Search |
|
LR1117C Datasheet(PDF) 6 Page - Leshan Radio Company |
|
LR1117C Datasheet(HTML) 6 Page - Leshan Radio Company |
6 / 10 page 1) To meet the minimum load current (>10mA) requirement, R1 is recommended to be 125ohm or lower. As LR1117C-ADJ can keep itself stable at load current about 2mA, R1 is not allowed to be higher than 625ohm. 2) Using a bypass capacitor (CADJ) between the ADJ pin and ground can improve ripple rejection. This bypass capacitor prevents ripple from being amplified as the output voltage is increased. The impedance of CADJ should be less than R1 to prevent ripple from being amplified. As R1 is normally in the range of 100Ω~500Ω, the value of CADJ should satisfy this equation: 1/(2frippleCADJ)<R1. THERMAL CONSIDERATIONS We have to take heat dissipation into great consideration when output current or differential voltage of input and output voltage is large. Because in such cases, the power dissipation consumed by LR1117 is very large. LR1117 series uses SOT-223 package type and its thermal resistance is about 20°C/W. And the copper area of application board can affect the total thermal resistance. If copper area is 5cm*5cm (two sides), the resistance is about 30°C/W. So the total thermal resistance is about 20°C/W + 30°C/W. We can decrease total thermal resistance by increasing copper area in application board. When there is no good heat dissipation copper are in PCB, the total thermal resistance will be as high as 120°C/W, then the power dissipation of LR1117 could allow on itself is less than 1W. And furthermore, LR1117 will work at junction temperature higher than 125°C under such condition and no lifetime is guaranteed. TYPICAL PERFORMANCE CHARACTERISTICS T=25°C unless specified. Line Regulation Load Regulation 0 0.3 0.6 0.9 1.2 1.5 0 2 4 6 8 10 12 14 Vin (V) LC1117-ADJ Vout Vs. Vin 0 0.3 0.6 0.9 1.2 1.5 0 0.2 0.4 0.6 0.8 1 1.2 Iout (A) LC1117-ADJ Vout Vs. Iout Dropout Voltage Thermal performance with OTP 0 0.3 0.6 0.9 1.2 1.5 0 0.2 0.4 0.6 0.8 1 1.2 Iout (A) LC1117-ADJ Dropout Vs. Iout 0 0.3 0.6 0.9 1.2 1.5 -50 0 50 100 150 200 Temperature (C) LC1117-ADJ Vout Vs. Temp LESHAN RADIO COMPANY, LTD. Feb 2011 Ver1.2 6/10 |
Similar Part No. - LR1117C |
|
Similar Description - LR1117C |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.NET |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | 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 |