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PDF KA3846 Data sheet ( Hoja de datos )

Número de pieza KA3846
Descripción SMPS Controller
Fabricantes Fairchild 
Logotipo Fairchild Logotipo



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No Preview Available ! KA3846 Hoja de datos, Descripción, Manual

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 “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
Internal Block Diagram
1
10
©2000 Fairchild Semiconductor International
Rev. 5.0

1 page




KA3846 pdf
KA3846
Td
OUTPUT DEADTIME(Td)
Figure 1. KA3846 Oscillator Circuit

Output deadtime is determined by the external capacitor, CT, according to the formula:
For large values of RT: Td (us) = l45CT (uF) Oscillator frequency is approximately
Td(us)=
145
CT(
µF
)
-1---2-----–-----R--1-------2T----3--(----.--K--6----------------)
by
the formula:
fT(KHz)=
-----------------2----.-2-------------------
RT(KΩ)CTF)
Figure 2. Error Amplifier Output Configuration
5

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