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SP6134EU Datasheet(PDF) 7 Page - Sipex Corporation |
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SP6134EU Datasheet(HTML) 7 Page - Sipex Corporation |
7 / 14 page 7 Date: 5/25/04 SP6134 Dual Supply, Synchronous Buck Controller © Copyright 2004 Sipex Corporation THEORY OF OPERATION: Continued zero response is required, then compensation can be a simple as an RC 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 compen- sation 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 can not 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. Gate Drivers The SP6134 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. 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 |
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