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KA3846 Datasheet(PDF) 1 Page - Fairchild Semiconductor

Part No. KA3846
Description  SMPS Controller
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Manufacturer  FAIRCHILD [Fairchild Semiconductor]
Direct Link  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

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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