Electronic Components Datasheet Search |
|
L6919CD Datasheet(PDF) 10 Page - STMicroelectronics |
|
L6919CD Datasheet(HTML) 10 Page - STMicroelectronics |
10 / 32 page L6919C 10/32 Figure 3. Soft Start Figure 4. Drivers peak current: High Side (left) and Low Side (right) DRIVER SECTION The integrated high-current drivers allow using different types of power MOS (also multiple MOS to reduce the RdsON), maintaining fast switching transition. The drivers for the high-side mosfets use BOOTx pins for supply and PHASEx pins for return. The drivers for the low-side mosfets use VCCDRV pin for supply and PGND pin for return. A minimum voltage of 4.6V at VC- CDRV pin is required to start operations of the device. The controller embodies a sophisticated anti-shoot-through system to minimize low side body diode conduction time maintaining good efficiency saving the use of Schottky diodes. The dead time is reduced to few nanosec- onds assuring that high-side and low-side mosfets are never switched on simultaneously: when the high-side mosfet turns off, the voltage on its source begins to fall; when the voltage reaches 2V, the low-side mosfet gate drive is applied with 30ns delay. When the low-side mosfet turns off, the voltage at LGATEx pin is sensed. When it drops below 1V, the high-side mosfet gate drive is applied with a delay of 30ns. If the current flowing in the inductor is negative, the source of high-side mosfet will never drop. To allow the turning on of the low-side mos- fet even in this case, a watchdog controller is enabled: if the source of the high-side mosfet don't drop for more than 240ns, the low side mosfet is switched on so allowing the negative current of the inductor to recirculate. This mechanism allows the system to regulate even if the current is negative. VIN=VCCDR VLGATEx PGOOD VOUT t t t t 2V Turn ON threshold 2048 Clock Cycles Timing Diagram Acquisition: CH1 = PGOOD; CH2 = VOUT; CH4 = LGATEx CH3 = HGATE1; CH4 = HGATE2 CH3 = LGATE1; CH4 = LGATE2 |
Similar Part No. - L6919CD |
|
Similar Description - L6919CD |
|
|
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 |