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UC1847 Scheda tecnica(PDF) 1 Page - Texas Instruments

Il numero della parte UC1847
Spiegazioni elettronici  Current Mode PWM Controller
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Produttore elettronici  TI [Texas Instruments]
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UC1847 Scheda tecnica(HTML) 1 Page - Texas Instruments

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Automatic Feed Forward Compensation
Programmable Pulse-by-Pulse Current
Limiting
Automatic Symmetry Correction in Push-pull
Configuration
Enhanced Load Response Characteristics
Parallel Operation Capability for Modular
Power Systems
Differential Current Sense Amplifier with
Wide Common Mode Range
Double Pulse Suppression
500mA (Peak) Totem-pole Outputs
•±1% Bandgap Reference
Under-voltage Lockout
Soft Start Capability
Shutdown Terminal
500kHZ Operation
Current Mode PWM Controller
The UC1846/7 family of control ICs provides all of the necessary
features to implement fixed frequency, current mode control
schemes while maintaining a minimum external parts count. The su-
perior performance of this technique can be measured in improved
line regulation, enhanced load response characteristics, and a sim-
pler, easier-to-design control loop. Topological advantages include
inherent pulse-by-pulse current limiting capability, automatic sym-
metry correction for push-pull converters, and the ability to parallel
“power modules" while maintaining equal current sharing.
Protection circuitry includes built-in under-voltage lockout and pro-
grammable current limit in addition to soft start capability. A shut-
down function is also available which can initiate either a complete
shutdown with automatic restart or latch the supply off.
Other features include fully latched operation, double pulse sup-
pression, deadline adjust capability, and a
±1% trimmed bandgap
reference.
The UC1846 features low outputs in the OFF state, while the
UC1847 features high outputs in the OFF state.
UC1846/7
UC2846/7
UC3846/7
BLOCK DIAGRAM
FEATURES
DESCRIPTION


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