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KA3846 Datasheet(PDF) 1 Page - Fairchild Semiconductor |
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KA3846 Datasheet(HTML) 1 Page - Fairchild Semiconductor |
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©2000 Fairchild Semiconductor International www.fairchildsemi.com Rev. 5.0 Features • 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 Modulator Power Systems • Differential Current Sense Amplifier with Common Mode Range • Double Pulse Suppression • 200mA Totem-Pole Outputs • ±2% Band gap Reference • Under-Voltage Lockout • Soft-Start Capability • Shutdown Terminal • 500KHz Operation Description The KA3846 control IC provides all of the necessary fea- tures 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 improved line regulation, enhanced load response char- acteristics, and a simpler, easier-to-design control loop. Topological advantages include inherent pulse-by-pulse cur- rent limiting capability, automatic symmetry correction for push-pull converters, and the ability to parallel “power module,, 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 shutdown 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 suppression, deadtime adjust capability, and ±2% trimmed bandgap reference. The KA3846 features low outputs in the OFF state. 16-DIP 1 Internal Block Diagram 10 KA3846 SMPS Controller |
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