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SLUSBL6 – FEBRUARY 2015 UCC24650 200-V Wake-Up Monitor for Fast Transient PSR
1 Features 3 Description The UCC24650 is an easy-to-use secondary-side
voltage monitor that periodically measures its own
VDD voltage. A relative droop of 3% from the
previous reading triggers a wake-up alert signal to a
receiving primary-side regulation (PSR) controller. Its
low-power consumption helps achieve tPCD(min) tDM < tPCD(min) PCD VOUT
(ripple) 0.97VS&H
A. Not to scale Figure 11. Timing Diagram of Internal PCD Signal 10 Submit Documentation Feedback Copyright В© 2015, Texas Instruments Incorporated Product Folder Links: UCC24650 UCC24650
www.ti.com SLUSBL6 – FEBRUARY 2015 Feature Description (continued) VNOM VOUT
0.97 VNOM IOUT IWAKE
Wake-up pulse generated by
sinking current out of VSEC VSEC VAUX Wake-up signal detected by primary
controller; switching initiated
A. Not to scale Figure 12. Simplified Timing Diagram of System Behavior
7.3.3 Sample, Hold, and Transient Detector
The sample-and-hold function (S&H) monitors the VDD voltage, samples that voltage during a PCD pulse, and …