Datasheet > 电源电路 > 开关式稳压器或控制器> UCC28251PW

UCC28251PW

更新时间： 2024-11-28 11:06:59

品牌	Logo	应用领域
德州仪器 - TI		开关控制器开关式稳压器开关式控制器光电二极管电源电路开关式稳压器或控制器
页数	文件大小	规格书
54页	902K
描述
支持预偏置模式、适用于离线应用的高级半桥/全桥 PWM 控制器 \| PW \| 20 \| -40 to 125

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UCC28251PW 技术参数

是否无铅：	不含铅	是否Rohs认证：	符合
生命周期：	Active	包装说明：	TSSOP-20
Reach Compliance Code：	compliant	ECCN代码：	EAR99
HTS代码：	8542.39.00.01	Factory Lead Time：	6 weeks
风险等级：	1.54	Samacsys Description：	Advanced PWM Controller with Pre-Bias Operation
模拟集成电路 - 其他类型：	SWITCHING CONTROLLER	控制模式：	CURRENT/VOLTAGE-MODE
控制技术：	PULSE WIDTH MODULATION	最大输入电压：	17 V
最小输入电压：	4.7 V	标称输入电压：	12 V
JESD-30 代码：	R-PDSO-G20	JESD-609代码：	e4
长度：	6.5 mm	湿度敏感等级：	1
功能数量：	1	端子数量：	20
最高工作温度：	125 °C	最低工作温度：	-40 °C
最大输出电压：	3.33 V	最小输出电压：	3.17 V
标称输出电压：	3.3 V	封装主体材料：	PLASTIC/EPOXY
封装代码：	TSSOP	封装等效代码：	TSSOP20,.25
封装形状：	RECTANGULAR	封装形式：	SMALL OUTLINE, THIN PROFILE, SHRINK PITCH
峰值回流温度（摄氏度）：	260	座面最大高度：	1.2 mm
最大供电电流 (Isup)：	2.5 mA	标称供电电压 (Vsup)：	12 V
表面贴装：	YES	切换器配置：	PUSH-PULL
最大切换频率：	945 kHz	温度等级：	AUTOMOTIVE
端子面层：	Nickel/Palladium/Gold (Ni/Pd/Au)	端子形式：	GULL WING
端子节距：	0.65 mm	端子位置：	DUAL
处于峰值回流温度下的最长时间：	NOT SPECIFIED	宽度：	4.4 mm
Base Number Matches：	1

UCC28251PW 数据手册

UCC28251

www.ti.com

SLUSBD8D –FEBRUARY 2013–REVISED APRIL 2013

Advanced PWM Controller With Pre-Bias Operation

Check for Samples: UCC28251

FEATURES

DESCRIPTION

The UCC28251 PWM controller is designed for high

power density applications that may have stringent

pre-biased startup requirements. The UCC28251’s

integrated synchronous rectifier control outputs target

high efficiency and high performance topologies such

as half-bridge, full-bridge, interleaved forward, and

push-pull. The UCC27210 half bridge drivers and

UCC2752x MOSFET drivers used in conjunction with

the UCC28251 provide a complete power converter

solution.

•

Pre-biased Startup

Synchronous Rectifier Control Outputs with

Programmable Delays (Including Zero Delay

Support)

•

Voltage Mode Control with Input Voltage Feed-

Forward or Current Mode Control

•

Primary or Secondary-Side Control

3.3-V, 1.5% Accurate Reference Output

Lower Minimum Operating Frequency

The UCC28251 is

a functional variant of the

1% Accurate Cycle-by-Cycle Over Current

Protection with Matched Duty Cycle Outputs

UCC28250 PWM Controller. While the same basic

functionality of the UCC28250 is largely maintained,

the UCC28251 is designed to enhance performance

in both offline, 400-V input DC-to-DC applications and

48-V input full-bridge or half-bridge applications.

•

Programmable Soft-Start and Hiccup Restart

Timer

Thermally Enhanced 4-mm x 4-mm QFN-20

Package and 20-pin TSSOP Package

Externally

programmable

soft-start,

used

conjunction with an internal pre-biased startup circuit,

allows the controller to gradually reach a steady-state

operating point under all output conditions. The

UCC28251 can be configured for primary or

secondary-side control and either voltage or current

mode control can be implemented.

APPLICATIONS

•

Half-Bridge, Full-Bridge, Interleaved Forward,

and Push-Pull Isolated Converters

•

Telecom and Data-com Power

Wireless Base Station Power

Server Power

The oscillator operates at frequencies up to 1.8 MHz,

and can be synchronized to an external clock. Input

voltage feedforward, cycle-by-cycle current limit, and

a programmable hiccup timer allow the system to

stay within a safe operation range. Input voltage,

output voltage and temperature protection can be

implemented. Dead time between primary-side switch

and secondary-side synchronous rectifiers can be

independently programmed.

Industrial Power Systems

Simple Application Diagram (400-V_INDC-to-DC Converter)

Secondary

Primary

400

Secondary

700-V Driver

UCC28251

OUTA

V_OUT

VREF

RAMP

Isolation

OUTB

Secondary

SRA

SRB

UCC2752x

VSENSE

GND

Not Shown : PS, SP, HICC, VDD, EA+, EN AND ILIM

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

12 3 4 5 6 7...54

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UCC28251PW 替代型号

型号	品牌	替代类型	描述	数据表
UCC28251PWR	TI	完全替代	Advanced PWM Controller With Pre-Bias Operation

与UCC28251PW相关器件

型号	品牌	获取价格	描述	数据表
UCC28251PWR	TI	获取价格	Advanced PWM Controller With Pre-Bias Operation
UCC28251PWT	TI	获取价格	Advanced PWM Controller With Pre-Bias Operation
UCC28251RGPR	TI	获取价格	Advanced PWM Controller With Pre-Bias Operation
UCC28251RGPT	TI	获取价格	Advanced PWM Controller With Pre-Bias Operation
UCC2825AL	TI	获取价格	2A SWITCHING CONTROLLER, 1000kHz SWITCHING FREQ-MAX, CQCC20, CERAMIC, LCC-20
UCC2825AN	TI	获取价格	2A SWITCHING CONTROLLER, 1000kHz SWITCHING FREQ-MAX, PDIP16, PLASTIC, DIP-16
UCC2825AQ	TI	获取价格	2A SWITCHING CONTROLLER, 1000kHz SWITCHING FREQ-MAX, PQCC20, PLASTIC, LCC-20
UCC2825BN	TI	获取价格	2A SWITCHING CONTROLLER, 1000kHz SWITCHING FREQ-MAX, PDIP16, PLASTIC, DIP-16
UCC2829DW-1	ROCHESTER	获取价格	2.2 A SWITCHING CONTROLLER, 4000 kHz SWITCHING FREQ-MAX, PDSO20, SOIC-20
UCC283	TI	获取价格	Low Dropout 3 Ampere Linear Regulator Family

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