Datasheet > UC3848Q

UC3848Q

更新时间： 2024-11-23 20:04:31

品牌	Logo	应用领域
德州仪器 - TI		开关
页数	文件大小	规格书
17页	997K
描述
2A SWITCHING CONTROLLER, 1000kHz SWITCHING FREQ-MAX, PQCC20, PLASTIC, LCC-20

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UC3848Q 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：	5.81	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：	12 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 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：	PUSH-PULL	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

UC3848Q 数据手册

application

INFO

UC1848

UC2848

UC3848

available

Average Current Mode PWM Controller

BLOCK DIAGRAM

FEATURES

• Practical Primary Side Control of

Isolated Power Supplies with DC

Control of Secondary Side Current

• 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

• Under Voltage Lockout Monitors VCC,

VIN and VREF

• Output Active Low During UVLO

• Low Startup Current (500µA)

• Precision 5V Reference (1%)

UDG-93003-1

DESCRIPTION

The UC3848 family of PWM control ICs makes primary output driver. The current error amplifier easily interfaces

side average current mode control practical for isolated with an optoisolator from a secondary side voltage sens-

switching converters. Average current mode control in- ing circuit.

sures that both cycle by cycle peak switch current and

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

maximum average inductor current are well defined and

tained in the UC3848. UVLO monitors the supply voltage

will not run away in a short circuit situation. The UC3848

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

can be used to control a wide variety of converter topolo-

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

before soft start commences. If either VCC or VIN is low,

gies.

In addition to the basic functions required for pulse width

modulation, the UC3848 implements a patented tech-

nique of sensing secondary current in an isolated buck

derived converter from the primary side. A current wave-

form synthesizer monitors switch current and simulates

the inductor current down slope so that the complete cur-

rent waveform can be constructed on the primary side

without actual secondary side measurement. This infor-

mation on the primary side allows for full DC control of

output current.

the supply 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 mon-

itored and pulse width is constrained to limit the maxi-

mum 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 UC3848 circuitry includes a precision reference, a

wide bandwidth error amplifier for average current con-

trol, an oscillator to generate the system clock, latching

PWM comparator and logic circuits, and a high current

Patents embodied in the UC3848 belong to Lambda

Electronics Incorporated and are licensed for use in ap-

plications employing these devices.

SLUS225A - April 1996 - REVISED MARCH 2004

12 3 4 5 6 7...17

中文翻译

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与UC3848Q相关器件

型号	品牌	获取价格	描述	数据表
UC3848QTR	TI	获取价格	2.2A SWITCHING CONTROLLER, 1000kHz SWITCHING FREQ-MAX, PQCC20
UC3848-S08-R	UTC	获取价格	Switching Regulator/Controller
UC3848-S08-T	UTC	获取价格	Switching Regulator/Controller
UC3849	TI	获取价格	Secondary Side Average Current Mode Controller
UC3849	UTC	获取价格	current mode pwm controller
UC3849B	UTC	获取价格	LOW COST POWER-SAVING MODE PWM CONTROLLER
UC3849BG-D08-T	UTC	获取价格	LOW COST POWER-SAVING MODE PWM CONTROLLER
UC3849BG-S08-R	UTC	获取价格	LOW COST POWER-SAVING MODE PWM CONTROLLER
UC3849BL-D08-T	UTC	获取价格	LOW COST POWER-SAVING MODE PWM CONTROLLER
UC3849BL-S08-R	UTC	获取价格	LOW COST POWER-SAVING MODE PWM CONTROLLER

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