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UCC1884 Datasheet

  • UCC1884

  • Frequency Foldback Current Mode PWM Controller

  • 8頁(yè)

  • TI

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application
INFO
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UCC1884
UCC2884
UCC3884
PRELIMINARY
Frequency Foldback Current Mode PWM Controller
FEATURES
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Frequency Foldback Reduces
Operating Frequency Under Fault
Conditions
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Accurate Programmable Volt-Second
Clamp
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Programmable Maximum Duty Cycle
Clamp
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Oscillator Synchronization
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Overcurrent Protection
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Shutdown with Full Soft Start
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Wide Gain Bandwidth Amplifier
(GBW > 2.5MHz)
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Current Mode Operation
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Precision 5V Reference
DESCRIPTION
The UCC3884 is a high performance current mode PWM controller in-
tended for single ended switch mode power supplies. The chip implements
a frequency foldback scheme that decreases the oscillator frequency as
the output voltage falls below a programmed value. This technique de-
creases the average output current sourced into a low impedance load
which can occur during an output short circuit or overload condition. Ex-
cessive short circuit current is more prevalent in high frequency converters
where the propagation delay and switch turn-off time forces a minimum at-
tainable duty cycle. An accurate volt-second clamp limits the duty cycle
during line or load transient conditions which could otherwise saturate the
transformer. The volt-second clamp may also be used with an external
overvoltage protection circuit to handle fault conditions such as current
sense disconnect or current transformer saturation. The frequency
foldback, volt-second clamp, cycle-by-cycle current limit, and overcurrent
shutdown provide a rich set of protection features for use in peak current
mode pulse width modulators.
BLOCK DIAGRAM
UDG-96026-1
SLUS160A - AUGUST 1999

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