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UCC3585 Datasheet(PDF) 10 Page - Texas Instruments

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Part # UCC3585
Description  LOW-VOLTAGE SYNCHRONOUS BUCK CONTROLLER
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

UCC3585 Datasheet(HTML) 10 Page - Texas Instruments

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UCC2585
UCC3585
SLUS304F − JULY 1999 − REVISED JANUARY 2005
10
www.ti.com
APPLICATION INFORMATION
A solution to this minimum on-time is a counter and time-out circuit. As described in the SD pin description, a
capacitor on SD enables the time-out circuit. An internal digital counter is used to count the overcurrent events
at the current-sense comparator output. When seven overcurrent conditions are reached, both MOSFET
switches are turned off, the SS capacitor is discharged, and an 11
µA (typical) internal current sink discharges
the SD capacitor. During this discharge time, both MOSFETs are held off, and the inductor current decays to
zero. When the SD capacitor voltage reaches 0.55 V (typical), a softstart cycle restarts the converter. During
softstart, the 7-cycle counter is disabled. However, the peak current limit comparator is enabled. When the SS
voltage reaches the threshold equal to (VIN − 0.5 V), the 7-cycle counter is enabled. By sizing the SS capacitor
relative to the SD capacitor, the amount of time spent switching the MOSFETs can be reduced when the output
is overloaded. If the timeout mode is used, the relative capacitance values for CSS and CSD must fall into the
following relationship:
C
SD v
20
C
SS
This equation also states that, if the time-out mode is used, a softstart capacitor must be used. Figure 4 shows
the waveforms when the converter is operated into a short circuit.
V(PDRV)
V(SD)
0.55 V
VIN−0.5 V
VIN
V(SS)
time
0 V
VIN
t
SHUT
Figure 4. Converter Operated Into Short Circuit
UCC3585 Not Recommended for New Designs


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