The KA3846 control IC provides all the necessary features to achieve a fixed frequency, current mode control scheme while maintaining a minimum number of external parts. The superior performance of this technology can be measured by improved line regulation, enhanced load response characteristics, and simpler, easier to design control loops.
Topological advantages include the inherent pulse-by-pulse current limiting capability, automatic symmetry correction for push-pull converters, and the ability to parallel "power modules" while maintaining equal current sharing. Protection circuits include built-in undervoltage locking and programmable current limiting, in addition to soft start capability. The shutdown feature is also available and can be activated with a full shutdown with an automatic restart or a power lock.
Other features include full latching operation, double pulse suppression, dead zone adjustment capability, and ±2% pruning band gap reference. The output of KA3846 is low in OFF state
KA3846 Internal block diagram
KA3846 Oscillator Circuit
Features
● Automatic feedforward compensation
● Programmable pulse current limit
● Automatic symmetry correction push-pull configuration
● Enhanced load response features
● Parallel operation capability of modulator power supply system
● Differential current detection amplifier and common mode range
● Double pulse suppression
● 200mA Totem pole output
● ±2% band gap reference
● Undervoltage lock
● Soft boot capability
● Shutdown terminal
● 500KHz operation
Mechanical Dimensions
