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12.5 Special Operation Modes
12.5.1
Light Load Operation
At light load, the burst operation enables when the switching duty cycle is small. The significant benefit of
this operation is the reduction of power loss. The associated disadvantage is higher output voltage-ripple
and larger output voltage-dip when the load has a sudden demand. But the higher ripple and the larger dip
disadvantages are corrected by the convenience and flexibility of the digital control. For example, non-
linear control from digital control solves the large dip during load transient. The higher ripple is also
reduced by narrowed duty cycle on and off-limit for burst operation control.
operation timing diagram.
NOTE: The burst operation mode is still in development for this EVM. Please contact TI for the latest
development information.
SLUUAK4 – August 2013
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Description of the Digital Phase-Shifted Full-Bridge Converter
Figure 37. Burst Operation Timing Diagram
Copyright © 2013, Texas Instruments Incorporated
Figure 37
shows the burst
Using the UCD3138PSFBEVM-027
39
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