Moteur de recherche de fiches techniques de composants électroniques |
|
AN8028 Fiches technique(PDF) 5 Page - Panasonic Semiconductor |
|
AN8028 Fiches technique(HTML) 5 Page - Panasonic Semiconductor |
5 / 13 page 5 Voltage Regulators AN8028 Pin No. Equivalent circuit Description I/O 8 TIM/OVP: I Terminal for use both OVP (overvoltage protec- tion circuit) and timer latch. [OVP] When overvoltage signal of the power supply is detected and high is inputted to the terminal, it turns off the internal circuit. At the same time, it holds that condition (latch). To reset the OVP latch, the VCC should be decreased to a voltage lower than the release voltage. [Timer latch] It detects the output voltage fall due to the overcurrent condition of the power supply out- put through the current level inputted to IFB. When the IIFB decreases under the current of certain value, the charge current flows in the capacitor which is connected to this terminal. Then, when the capacitor is charged up to the threshold voltage of the OVP, the OVP works so that the IC could keep the operation stop condi- tion. 9 FB: I Terminal for connecting the photocoupler for error voltage feedback of the power supply out- put. It is possible to cancel about 180 µA of the dark current of photocoupler. s Terminal Equivalent Circuits (continued) 5 µA 7.3 V Comp. 8 VCC TON 9 VCC s Application Notes [1] Operation descriptions 1. Start/stop circuit block • Start mechanism When AC voltage is applied and the supply voltage reaches the start voltage through the current from start resistor, the IC starts opera- tion. Then the power MOSFET driving starts. Thereby, bias is generated in the transformer and the supply voltage is given from the bias coil to the IC. (This is point a in figure 1 ) During the period from the time when the start voltage is reached and the voltage is gen- erated in the bias coil to the time when the IC is provided with a sufficient supply voltage, the supply voltage of the IC is supplied by the capacitor (C8) connected to VCC . Start voltage Stop voltage a b Start condition Start failure c Voltage supplied from bias coil Before start Start VCC VOUT GND After AC rectification Figure 1 Start resistance R1 C8 |
Numéro de pièce similaire - AN8028 |
|
Description similaire - AN8028 |
|
|
Lien URL |
Politique de confidentialité |
ALLDATASHEET.FR |
ALLDATASHEET vous a-t-il été utile ? [ DONATE ] |
À propos de Alldatasheet | Publicité | Contactez-nous | Politique de confidentialité | Echange de liens | Fabricants 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 |