 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
SP6132H Datasheet(PDF) 6 Page - Exar Corporation |
|
||||||||||||||||||||||||||||||
SP6132H Datasheet(HTML) 6 Page - Exar Corporation |
|
|
6 / 14 page  6 Date:2/14/06 SP6132H High Voltage, Synchronous PWM Controller © Copyright 2006 Sipex Corporation THEORY OF OPERATION: Continued Error Amplifier and Voltage Loop As stated before, the heart of the SP6132H voltage error loop is a high performance, wide bandwidth transconductance amplifier. Be- cause of the amplifier’s current limited (+150 µA) transconductance, there are many ways to com- pensate the voltage loop or to control the COMP pin externally. If a simple, single pole, single zero response is required, then compensation can be as simple as an RC circuit to ground. If a more complex compensation is required, then the amplifier has enough bandwidth (45 ° at 4 MHz) and enough gain (60dB) to run Type III compensation schemes with adequate gain and phase margins at cross over frequencies greater than 50kHz. The common mode output of the error amplifier is 0.9V to 2.2V. Therefore, the PWM voltage ramp has been set between 1.1V and 2.2V to ensure proper 0% to 100% duty cycle capability. The voltage loop also includes two other very important features. One is an asynchronous start up mode. Basically, the GL driver cannot turn on unless the GH driver has attempted to turn on or the SS pin has exceeded 1.7V. This feature prevents the controller from “dragging down” the output voltage during startup or in fault modes. The second feature is a 100% duty cycle timeout that ensures synchronized refreshing of the BST capacitor at very high duty ratios. In the event that the GH driver is on for 20 continuous clock cycles, a reset is given to the PWM flip flop half way through the 21st cycle. This forces GL to rise for the remainder of the cycle, in turn refreshing the BST capacitor. 90% 10% RISE TIME 2V NON-OVERLAP FALL TIME 2V 90% 10% GH(GL) GL(GH) GATE DRIVER TEST CONDITIONS V(BST) GH Voltage V(VCC) V(SWN) GL Voltage V(VIN) 0V -0V -V(Diode) V V(VIN)+V(VCC) BST Voltage V(VCC) TIME SWN Voltage Gate Drivers The SP6132H contains a pair of powerful 2 Ω SOURCE and 1.5 Ω SINK drivers. These state- of-the-art drivers are designed to drive external NFETs capable of handling up to 30A. Rise, fall, and non-overlap times have all been minized to achieve maximum efficiency. All drive pins GH, GL & SWN are monitored continuously to ensure that only one external NFET is ever on at any given time. |
Similar Part No. - SP6132H |
|
Similar Description - SP6132H |
|
|
|
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 |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
