Datasheet > UC3548Q

UC3548Q

更新时间： 2024-01-29 17:40:21

品牌	Logo	应用领域
德州仪器 - TI		开关
页数	文件大小	规格书
10页	362K
描述
2.2A SWITCHING CONTROLLER, 1000kHz SWITCHING FREQ-MAX, PQCC20, PLASTIC, LCC-20

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UC3548Q 技术参数

是否Rohs认证：	不符合	生命周期：	Obsolete
零件包装代码：	QLCC	包装说明：	QCCJ, LDCC20,.4SQ
针数：	20	Reach Compliance Code：	not_compliant
ECCN代码：	EAR99	HTS代码：	8542.39.00.01
风险等级：	5.91	模拟集成电路 - 其他类型：	SWITCHING CONTROLLER
控制模式：	CURRENT-MODE	控制技术：	PULSE WIDTH MODULATION
最大输入电压：	20 V	最小输入电压：	11 V
标称输入电压：	12 V	JESD-30 代码：	S-PQCC-J20
长度：	8.965 mm	功能数量：	1
端子数量：	20	最高工作温度：	70 °C
最低工作温度：		最大输出电流：	2.2 A
封装主体材料：	PLASTIC/EPOXY	封装代码：	QCCJ
封装等效代码：	LDCC20,.4SQ	封装形状：	SQUARE
封装形式：	CHIP CARRIER	峰值回流温度（摄氏度）：	NOT SPECIFIED
认证状态：	Not Qualified	座面最大高度：	4.57 mm
子类别：	Switching Regulator or Controllers	表面贴装：	YES
切换器配置：	SINGLE	最大切换频率：	1000 kHz
技术：	BIPOLAR	温度等级：	COMMERCIAL
端子形式：	J BEND	端子节距：	1.27 mm
端子位置：	QUAD	处于峰值回流温度下的最长时间：	NOT SPECIFIED
宽度：	8.965 mm	Base Number Matches：	1

UC3548Q 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...10

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与UC3548Q相关器件

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UC3548QTR	TI	获取价格	2.2A SWITCHING CONTROLLER, 1000kHz SWITCHING FREQ-MAX, PQCC20, PLASTIC, LCC-20
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UC3550-33-AF5-R	UTC	获取价格	PWM CONTROLLED，PWM/PFM SWITCHABLE STEP-UP DC-
UC3550-50-AF5-R	UTC	获取价格	PWM CONTROLLED，PWM/PFM SWITCHABLE STEP-UP DC-
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