Datasheet > UC2548J

UC2548J

更新时间： 2024-11-04 23:38:51

品牌	Logo	应用领域
其他 - ETC		开关控制器
页数	文件大小	规格书
9页	377K
描述
Current-Mode SMPS Controller

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中文翻译

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数据手册

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UC2548J 数据手册

UC1548

UC2548

UC3548

Primary Side PWM Controller

FEATURES

BLOCK DIAGRAM

•

Primary Side Voltage Feed-

forward Control of Isolated Power

Supplies

•

Accurate DC Control of

Secondary Side Short Circuit

Current using Primary Side

Average Current Mode Control

•

Accurate Programmable

Maximum Duty Cycle Clamp

Maximum Volt-Second Product

Clamp to Prevent Core Saturation

•

Practical Operation Up to 1MHz

High Current (2A Pk) Totem Pole

Output Driver

•

Wide Bandwidth (8MHz) Current

Error Amplifier

Undervoltage Lockout Monitors

VCC, VIN and VREF

•

Output Active Low During UVLO

Low Startup Current (500µA)

UDG-95037

Pin numbers refer to 16-pin DIL and SOIC packages only.

DESCRIPTION

The UC3548 family of PWM control ICs uses voltage feed- driver. The current error amplifier easily interfaces with an

forward control to regulate the output voltage of isolated optoisolator from a secondary side voltage sensing circuit.

power supplies. The UC3548 resides on the primary side

A full featured undervoltage lockout (UVLO) circuit is con-

and has the necessary features to accurately control sec-

tained in the UC3548. UVLO monitors the supply voltage

ondary side short circuit current with average current

to the controller (VCC), the reference voltage (VREF), and

mode control techniques. The UC3548 can be used to

the input line voltage (VIN). All three must be good before

control a wide variety of converter topologies.

soft start commences. If either VCC or VIN is low, the sup-

In addition to the basic functions required for pulse width

modulation, the UC3548 implements a patented technique

of sensing secondary current from the primary side in an

isolated buck derived converter. A current waveform syn-

thesizer monitors switch current and simulates the inductor

current downslope so that the complete current waveform

can be constructed on the primary side without actual sec-

ondary side measurement. This information on the primary

side is used by an average current mode control circuit to

accurately limit maximum output current.

ply current required by the chip is only 500µA and the

output is actively held low.

Two on board protection features set controlled limits to

prevent transformer core saturation. Input voltage is moni-

tored and pulse width is constrained to limit the maximum

volt-second product applied to the transformer. A unique

patented technique limits maximum duty cycle within 3%

of a user programmed value.

These two features allow for more optimal use of trans-

formers and switches, resulting in reduced system size

and cost.

The UC3548 circuitry includes a precision reference, a

wide bandwidth error amplifier for average current control,

an oscillator to generate the system clock, latching PWM

comparator and logic circuits, and a high current output

Both patents embodied in the UC3548 belong to Lambda

Electronics Incorporated and are licensed for use in appli-

cations employing these devices.

4/97

12 3 4 5 6 7...9

中文翻译

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与UC2548J相关器件

型号	品牌	获取价格	描述	数据表
UC2548L	ETC	获取价格	Current-Mode SMPS Controller
UC2548N	ETC	获取价格	Current-Mode SMPS Controller
UC2548Q	ETC	获取价格	Current-Mode SMPS Controller
UC2548QTR	ETC	获取价格	Current-Mode SMPS Controller
UC2572	TI	获取价格	Negative Output Flyback Pulse Width Modulator
UC2572_08	TI	获取价格	Negative Output Flyback Pulse Width Modulator
UC2572D	TI	获取价格	Negative Output Flyback Pulse Width Modulator
UC2572DG4	TI	获取价格	Negative Output Flyback Pulse Width Modulator
UC2572DTR	TI	获取价格	Negative Output Flyback Pulse Width Modulator
UC2572DTRG4	TI	获取价格	Negative Output Flyback Pulse Width Modulator 8-SOIC -40 to 85

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