Part Number: UCC14241-Q1
Hello TI E2E Experts,
My team is currently in the component selection phase for a new project, and we are strongly considering the UCC14241-Q1 for our application.
Our use case is a bipolar amplifier power supply, where low output voltage ripple on both the positive and negative rails is critical for maintaining signal integrity. While reviewing the device specifications to ensure it matches our system requirements, I noticed that the COM-VEE regulator utilizes two different hysteresis windows — one wide (±20 mV) and one narrow (~1.25 mV) — as shown in the datasheet (Figure 8-2, SLUSF09).
I have the following technical questions:
1. What is the design intent behind using two distinct hysteresis windows for the charge and discharge paths? How does this dual-window approach solve practical problems in the application?
2. Is the wide window (±20 mV) primarily intended for startup and large-signal transient response, while the narrow window (~1.25 mV) handles fine regulation during steady-state operation? Or do they serve a different purpose?
3. For our bipolar amplifier application, where ripple minimization is the top priority, would it be possible to configure the device to use only the narrow hysteresis window (~1.25 mV) for both charge and discharge? If so, what external configuration (e.g., RLIM/RDR network values, capacitor selection, or other pin settings) would be required to achieve this?
4. If the dual-window architecture is fixed and cannot be altered, what practical measures can we take to minimize the COM-VEE output ripple in steady-state operation? For example, would increasing COUT3, optimizing the FBVEE divider, or adjusting RLIM values help reduce the ripple amplitude?
Any technical insights or application guidance would be greatly appreciated.
Best regards,
Luo Jiang
