This occurs when the IC is operated in PFM mode. When it automatically transitions to PWM mode at higher loads, the device must still check for PFM mode in order to keep the efficiency high. It needs to know when to leave PWM mode so it must check. This…
Other Parts Discussed in Thread: TINA-TI Update of TINA9-TI Spice Model Libraries and Example Circuits
This note describes the step-by-step process for updating the TINA9-TI Spice Macro Libraries and Example circuits. The update is initiated by selecting…
Other Parts Discussed in Thread: TPS62097 In theory, feedforward capacitor will introduce a zero and a pole, therefore can boost both the bandwidth and phase margin. However, in this paper, bandwidth narrows with increasing Cff, how to understand this…
Hello,
The UCC3806 is a dual output controller though it can be used in a flyback where only one of the outputs are used to drive the switch it might be better to choose a single output controller. Look at page 46 of the attached under General Purpose…
Siyu,
I think the toggle flip-flop in the block diagram on page one of the spec should have let you know that the max you will get with this device is 50% duty.
Go to page 43 and 44 of the attached and select a more suitable part.
Peter,
i am enclosing the Power Management Guide for 2011. The section you will be interested in starts on page 43 and actual devices listed on page 46, With the minimum information you have given me I would expect that you will want something like…
Hi,
I've attached the 2013 User's Guide for power products. Starting on page 53 you will find a selection of PWM controllers. many of these teh frequency can be varied according to external criteria.
As an example if you use a UC3842 it is a simple…
Gary,
Most any of our power controllers with dual output capability will provide the control. See attached document starting at page 50 with the dual output controllers on page 53 and 54 and choose what features you want.
Regards,
John
