Electronic Components Datasheet Search |
|
XC9509D033AL Datasheet(PDF) 8 Page - Torex Semiconductor |
|
XC9509D033AL Datasheet(HTML) 8 Page - Torex Semiconductor |
8 / 41 page 8/41 XC9509 Series FOSC L 1.2MHz 4.7μH (CDRH4D28C, SUMIDA) 600kHz 10μH (CDRH5D28, SUMIDA) 300kHz 22μH (CDRH6D28, SUMIDA) CIN CL1 CL2 (*2) VROUT<2.0V 4.7μF (ceramic, TAIYO YUDEN) Vdif>1.0V 1.0μF (ceramic, TAIYO YUDEN) 4.7μF (ceramic, TAIYO YUDEN) 10μF (ceramic, TAIYO YUDEN) VROUT>2.0V Vdif<1.0V 4.7μF (ceramic, TAIYO YUDEN) ■ TYPICAL APPLICATION CIRCUIT MSOP-10 (TOP VIEW) SD *1 : XB0ASB03A1BR (TOREX) *1 The DC/DC converter of the XC9508 series automatically switches between synchronous / non-synchronous. The Schottky diode is not normally needed. However, in cases where high efficiency is required when using the DC/DC converter during in the light load while in non-synchronous operation, please connect a Schottky diode externally. *2 Please be noted that the recommend value above of the CL2 may be changed depending on the input voltage value and setting voltage value. ■ OPERATIONAL EXPLANATION The XC9509 series consists of a synchronous step-down DC/DC converter, a high speed LDO voltage regulator, and a voltage detector. ● DC/DC Converter The series consists of a reference voltage source, ramp wave circuit, error amplifier, PWM comparator, phase compensation circuit, output voltage adjustment resistors, driver transistor, synchronous switch, current limiter circuit, U.V.L.O. circuit and others. The series ICs compare, using the error amplifier, the voltage of the internal voltage reference source with the feedback voltage from the VOUT pin through split resistors. Phase compensation is performed on the resulting error amplifier output, to input a signal to the PWM comparator to determine the turn-on time during PWM operation. The PWM comparator compares, in terms of voltage level, the signal from the error amplifier with the ramp wave from the ramp wave circuit, and delivers the resulting output to the buffer driver circuit to cause the Lx pin to output a switching duty cycle. This process is continuously performed to ensure stable output voltage. The current feedback circuit monitors the P-channel MOS driver transistor current for each switching operation, and modulates the error amplifier output signal to provide multiple feedback signals. This enables a stable feedback loop even when a low ESR capacitor, such as a ceramic capacitor, is used, ensuring stable output voltage. <Reference Voltage Source> The reference voltage source provides the reference voltage to ensure stable output voltage of the DC/DC converter. <Ramp Wave Circuit> The ramp wave circuit determines switching frequency. The frequency is fixed internally and can be selected from 300kHz, 600 kHz and 1.2 MHz. Clock pulses generated in this circuit are used to produce ramp waveforms needed for PWM operation, and to synchronize all the internal circuits. <Error Amplifier> The error amplifier is designed to monitor output voltage. The amplifier compares the reference voltage with the feedback voltage divided by the internal split resistors. When a voltage lower than the reference voltage is fed back, the output voltage of the error amplifier increases. The gain and frequency characteristics of the error amplifier output are fixed internally to deliver an optimized signal to the mixer. |
Similar Part No. - XC9509D033AL |
|
Similar Description - XC9509D033AL |
|
|
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 |