Datasheet > UCC2839N

UCC2839N

更新时间： 2024-11-23 23:39:03

品牌	Logo	应用领域
其他 - ETC		开关控制器
页数	文件大小	规格书
6页	235K
描述
Current/Voltage-Mode SMPS Controller

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UCC2839N 数据手册

UCC2839

UCC3839

Secondary Side Average Current Mode Controller

FEATURES

DESCRIPTION

• Practical Secondary Side Control of

The UCC3839 provides the control functions for secondary side average

current mode control in isolated power supplies. Start up, pulse width mod-

ulation and MOSFET drive must be accomplished independently on the

primary side. Communication from secondary to primary side is antici-

pated through an opto-isolator.

Isolated Power Supplies

• Provides a Self Regulating Bias

Supply From a High Input Voltage

Using an External N-Channel

Depletion Mode FET

Accordingly, the UCC3839 contains a fixed gain current sense amplifier,

voltage and current error amplifiers, and a Gm type buffer/driver amplifier

for the opto-isolator. Additional housekeeping functions include a precision

5V reference and a bias supply regulator.

• Onboard Precision, Fixed Gain,

Differential Current Sense Amplifier

• Wide Bandwidth Current Error

Amplifier

Power for the UCC3839 can be generated by peak rectifying the voltage of

the secondary winding of the isolation transformer. From this unregulated

voltage, the UCC3839’s bias supply regulator will generate its own 7.5V

bias supply using an external, N-channel, depletion mode FET.

• 5V Reference

• High Current, Programmable Gm

Amplifier Optimized to Drive

Opto-couplers

The UCC3839 can be configured for traditional average current mode con-

trol where the output of the voltage error amplifier commands the current

error amplifier. It can also be configured for output voltage regulation with

average current mode short circuit current limiting, employing two parallel

control loops regulating the output voltage and output current independ-

ently.

BLOCK DIAGRAM

UDG-97011

SLUS179A - APRIL 1999 - REVISED NOVEMBER 2001

12 3 4 5 6

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