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UC2847 Datasheet(PDF) 1 Page - Texas Instruments |
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UC2847 Datasheet(HTML) 1 Page - Texas Instruments |
1 / 10 page UC1846/7 UC2846/7 UC3846/7 SLUS352A - JANUARY 1997 - REVISED MARCH 2002 • 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 superior performance of this technique can be measured in im- proved line regulation, enhanced load response characteristics, and a simpler, easier-to-design control loop. Topological advantages in- clude inherent pulse-by-pulse current limiting capability, automatic symmetry correction for push-pull converters, and the ability to par- allel “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. BLOCK DIAGRAM 15 10 9 8 OSC 3 4 X3 + 5 6 E/A 7 COMP INV NI C/S+ C/S- CT RT SYNC VIN 5.1 V REFERENCE REGULATOR UVLO LOCKOUT 2VREF 13 11 VC AOUT 14 12 BOUT GND Q Q T S S R Q 1 16 6k 0.5 mA 350 mV 0.5 V F/F CURRENT LIMIT ADJUST SHUTDOWN UC1846 Output Stage UC1847 Output Inverted COMP FEATURES DESCRIPTION application INFO available UDG-02057 |
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