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UC2846J Datasheet

  • UC2846J

  • Current Mode PWM Controller

  • 465.88KB

  • 8頁

  • TI

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UC1846/7
UC2846/7
UC3846/7
Current Mode PWM Controller
FEATURES
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Automatic Feed Forward Compensation
DESCRIPTION
The UC1846/7 family of control ICs provides all of the necessary
features to implement fixed frequency, current mode control
Programmable Pulse-by-Pulse Current
schemes while maintaining a minimum external parts count. The su-
Limiting
perior performance of this technique can be measured in improved
Automatic Symmetry Correction in Push-pull line regulation, enhanced load response characteristics, and a sim-
Configuration
pler, easier-to-design control loop. Topological advantages include
inherent pulse-by-pulse current limiting capability, automatic sym-
Enhanced Load Response Characteristics
metry correction for push-pull converters, and the ability to parallel
Parallel Operation Capability for Modular
鈥減ower modules" while maintaining equal current sharing.
Power Systems
Protection circuitry includes built-in under-voltage lockout and pro-
Differential Current Sense Amplifier with
grammable current limit in addition to soft start capability. A shut-
Wide Common Mode Range
down function is also available which can initiate either a complete
shutdown with automatic restart or latch the supply off.
Double Pulse Suppression
500mA (Peak) Totem-pole Outputs
鹵1%
Bandgap Reference
Under-voltage Lockout
Soft Start Capability
Shutdown Terminal
500kHZ Operation
Other features include fully latched operation, double pulse sup-
pression, deadline adjust capability, and a
鹵1%
trimmed bandgap
reference.
The UC1846 features low outputs in the OFF state, while the
UC1847 features high outputs in the OFF state.
BLOCK DIAGRAM
1/97

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