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UC3846N Datasheet

  • UC3846N

  • SMPS Controller

  • 10頁

  • FAIRCHILD

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www.fairchildsemi.com
UC3846
SMPS Controller
Features
鈥?Automatic Feed Forward Compensation
鈥?Programmable Pulse by Pulse Current Limiting
鈥?Automatic Symmetry Correction in Push-Pull
Configuration
鈥?Enhanced Load Response Characteristics
鈥?Parallel Operation Capability for Modulator Power
Systems
鈥?Differential Current Sense Amplifier with Common Mode
Range
鈥?Double Pulse Suppression
鈥?200mA Totem-Pole Outputs
鈥?/div>
鹵2%
Band gap Reference
鈥?Under-Voltage Lockout
鈥?Soft-Start Capability
鈥?Shutdown Terminal
鈥?500KHz Operation
Description
The UC3846 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 鈥減ower
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
鹵2% trimmed bandgap reference. The UC3846 features low
outputs in the OFF state.
16-DIP
1
Internal Block Diagram
10
Rev. 5.0
漏2000 Fairchild Semiconductor International

UC3846N 產(chǎn)品屬性

  • 25

  • 集成電路 (IC)

  • PMIC - 穩(wěn)壓器 - DC DC 切換控制器

  • -

  • 電流模式

  • 2

  • 500kHz

  • 50%

  • 8 V ~ 40 V

  • 是

  • 是

  • 是

  • 無

  • 無

  • 無

  • 無

  • 無

  • 0°C ~ 70°C

  • 16-DIP（0.300"，7.62mm）

  • 管件

  • 296-11301-5

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