Electronic Components Datasheet Search |
|
PQ1PF1 Datasheet(PDF) 8 Page - Sharp Corporation |
|
PQ1PF1 Datasheet(HTML) 8 Page - Sharp Corporation |
8 / 14 page Primary Regulators CA PC1 4 35 1 2 PQ1PF1 PQ1PF1 Output current VFB VFB (OCP) 2.8V VCA 3.6V VCA (OVP) 7.7V DMAX DMIN 0 Overcurrent detection Overload shut-down 3-2 Overcurrent protection function Overcurrent protection circuit is shown in Fig.2. Fig.3 shows timing chart of OFF control process after detecting overcurrent. First, drain current of MOS-FET (which is built-in device) is getting high due to overcurrent. When it comes up to overcurrent detection level ID(OCP)=2.5A, overcurrent protection circuit will operate and minimize output pulse width to minimum duty by pulse- by-pulse. Minimizing output pulse width makes output voltage lower. As output voltage is lowered, collector-emitter voltage of PC1 will be turned OFF and FB voltage VFB will be high. When VFB comes up to threshold voltage of overload shut-down VFB(OCP) 2.8V, CA voltage VCA will be released from clamped voltage 3.6V and the capacitor CA which is connected to CA terminal will be charged again by 10 µA of charge current. When VCA increases to CA threshold voltageVCA (OVP) 7.7V, internal constant voltage supply of IC becomes OFF-state and maintain shut-down state. To maintain output shut-down condition, 0.3mA (Vcc=11V) TYP. is required. To restart, Vcc needs to be lowered less then operation stopping voltageVCC(OFF) 9.3V by applying input voltage again. Fig.2 Overcurrent Protection Circuit Fig.3 Timing Chart Overcurrent Protection |
Similar Part No. - PQ1PF1 |
|
Similar Description - PQ1PF1 |
|
|
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 |