Electronic Components Datasheet Search |
|
L6926013TR Datasheet(PDF) 4 Page - STMicroelectronics |
|
L6926013TR Datasheet(HTML) 4 Page - STMicroelectronics |
4 / 11 page L6926 4/11 (*) Guaranteed by design 4 OPERATION DESCRIPTION The main loop uses slope compensated PWM current mode architecture. Each cycle the high side MOSFET is turned on, triggered by the oscillator, so that the current flowing through it (the same as the inductor current) increases. When this current reaches the threshold (set by the output of the error amplifier E/A), the peak current limit comparator PEAK_CL turns off the high side MOSFET and turns on the low side one until the next clock cycle begins or the current flowing through it goes down to zero (ZERO CROSSING comparator). The peak in- ductor current required to trigger PEAK_CL depends on the slope compensation signal and on the output of the error amplifier. In particular, the error amplifier output depends on the VFB pin voltage. When the output current increases, the output capacitor is discharged and so the VFB pin decreases. This produces increase of the error amplifier out- put, so allowing a higher value for the peak inductor current. For the same reason, when due to a load transient the output current decreases, the error amplifier output goes low, so reducing the peak inductor current to meet the new load requirements. The slope compensation signal allows the loop stability also in high duty cycle conditions (see related section) Figure 4. Device Block Diagram 4.1 Modes of Operation Depending on the SYNC pin value the device can operate in low consumption or low noise mode. If the SYNC pin is high (higher than 1.3V) the low consumption mode is selected while the low noise mode is selected if the SYNC pin is low (lower than 0.5V). 4.1.1 Low Consumption Mode VPGOOD Power Good Threshold VOUT = Vfb 90 %Vout ∆VPGOOD Power Good Hysteresis VOUT = Vfb 4 %Vout VPgood(low) Power Good Low Voltage Run to GND 0.4 V ILK-PGOOD Power Good Leakage Current (*) VPGOOD = 3.6V 50 nA PROTECTIONS HOVP Hard overvoltage threshold VOUT = Vfb 10 %Vout VCC SYNC COMP PGOOD GND DRIVER GND GND GND PEAK CL VALLEY CL Vcc ZERO CROSSING LOOP CONTROL OSCILLATOR LOW NOISE/ CONSUMPTION LX OVP VREF FB E/A P GOOD POWER PMOS POWER NMOS SENSE PMOS SENSE NMOS Vcc 0.6V VREF 0.9V SLOPE RUN VCC SYNC COMP PGOOD GND DRIVER GND GND GND PEAK CL VALLEY CL Vcc ZERO CROSSING LOOP CONTROL OSCILLATOR LOW NOISE/ CONSUMPTION LX OVP VREF FB E/A P GOOD POWER PMOS POWER NMOS SENSE PMOS SENSE NMOS Vcc 0.6V VREF 0.9V SLOPE RUN |
Similar Part No. - L6926013TR |
|
Similar Description - L6926013TR |
|
|
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 |