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UCC24636DBVT Datasheet(PDF) 9 Page - Texas Instruments |
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UCC24636DBVT Datasheet(HTML) 9 Page - Texas Instruments |
9 / 35 page S&H VPC Thresh Ramp Enable S Q Q R VPC TBLK VDD + VVPCEN SR_On Detect SRon DRV Enable VVSCEN DRV GND VSC Min tOFF UVLO 4.0/3.6 V SR Control Bias Fsw Detect Stand By Thermal SD VPC Bias Stand By VPC Blanking Timer tVPC-BLK VPC Ramp VSC Ramp One Shot Min tON + + + + + 9 UCC24636 www.ti.com SLUSCG2A – MARCH 2016 – REVISED MARCH 2016 Product Folder Links: UCC24636 Submit Documentation Feedback Copyright © 2016, Texas Instruments Incorporated 8 Detailed Description 8.1 Overview The UCC24636 SR controller is targeted for flyback converters operating in DCM and TM modes of operation. The control method to determine SR on time is based on the volt-second balance principle of primary and secondary conduction volt-second product. In converters operating in DCM and TM, the secondary current always returns to zero in each cycle. The inductor charge voltage and time product is equal to the discharge voltage and time product. The device uses internal current ramp emulators to predict the proper SR on time based on voltage and time information on the VPC and VSC pins. To achieve very low standby power in the converter, the UCC24636 has a standby mode of operation that disables the SR MOSFET drive and reduces the device bias current to ISTBY. The device monitors the average switching frequency of the converter to enter and exit the standby mode of operation, and is compatible with converters operating in burst mode or constant frequency in light-load mode. 8.2 Functional Block Diagram |
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