KA3846 ,SMPS ControllerFeatures Description• Automatic Feed Forward Compensation The KA3846 control IC provides all of the ..
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KA3846
SMPS Controller
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
DescriptionThe 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.
