Electronic Components Datasheet Search |
|
XC9301 Datasheet(PDF) 6 Page - Torex Semiconductor |
|
XC9301 Datasheet(HTML) 6 Page - Torex Semiconductor |
6 / 12 page XC9301/9302 Series 602 6 ■Operational Explanation Ramp Wave OSC Error Amp. Comparator Buffer, Driver PWM/PFM Controller Compensation VOUT CE Vref with Soft Start, + - + - Generator, PWM Phase CE GND EXT/ VDD <Block Diagram> CE CL SD1 L VOUT VIN CIN SD2 PSW NSW VOUT GND EXT VIN CE <Circuit Connection Example> The XC9301/9302 series are PWM (PWM/PFM switching) step-up/down DC/DC converter controller ICs. The XC9302 series switches to PFM operations during light loads and is very efficient over a wide range in relation to load. Further, the efficiency can be maintained over a wide input voltage range as both step-up & step-down operations are PWM controlled. Output voltage settings are laser trimmed. [ON TIME] P-Ch MOSFET (PSW) = ON, N-Ch MOSFET (NSW) = ON : Current flows from VIN via PSW, L, NSW, to GND : L is charged. [OFF TIME] P-Ch MOSFET (PSW) = OFF, N-Ch MOSFET (NSW) = OFF : Current flows from GND via SD1, L, SD2, to VOUT : VOUT rises due to the charge stored at L. By comparing VOUT with the internal reference voltage, the ON TIME vs OFF TIME ratio can be regulated & output stability can be protected. ■Block Diagram Explanation <Error Amp.> The error amplifier is used as an output voltage monitor. It compares the reference voltage with the feedback from the voltage divided by the internal resistor. Should a voltage higher than the reference voltage be fedback, the output of the error amp will increase. <PWM Comparator> The PWM comparator compares the output of the error amp with the ramp wave. When the voltage at the output of the error amp is low, the EXT/ pin will be LOW level (Switching ON time). <Ramp Wave Generator> The ramp wave generator, as the name suggests, generates the switching frequency's ramp wave. <PWM / PFM Controller> With the XC9302 series, control is automatically switched between PWM and PFM according to the size of the load. <Vref with Soft Start, CE> The start up of the Vref voltage at the error amp's input is gradual due to the internal capacitor and low current circuit. Because of this soft-start function, the operations of the error amp's 2 inputs are balanced and the EXT/ pin's ON time can be manipulated to produce longer ON times. Further, with the UVLO function, the signal will be such so as not to turn the MOS switch ON until any instability in the internal circuit stabilizes during soft-start time. Even in cases where input voltage is so low as to produce instability in the IC, the UVLO function will operate and the MOS switch will be turned OFF. 06S_15XC9301/02新規 02.9.12 3:28 PM ページ 602 |
Similar Part No. - XC9301 |
|
Similar Description - XC9301 |
|
|
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 |