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KA3846 Datasheet, PDF (1/10 Pages) Fairchild Semiconductor – SMPS Controller | |||
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KA3846
SMPS Controller
www.fairchildsemi.com
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 âpower
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
©2000 Fairchild Semiconductor International
Rev. 5.0
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