UC3844B

批量生产
Design Win

电流模式PWM

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产品概述

描述

The UC284xB family of control ICs provides the necessary features to implement off-line or DC to DC fixed frequency current mode control schemes with a minimal external parts count. Internally implemented circuits include a trimmed oscillator for precise DUTY CYCLE CONTROL under voltage lockout featuring start-up current less than 0.5mA, a precision reference trimmed for accuracy at the error amp input, logic to insure latched operation, a PWM comparator which also provides current limit control, and a totem pole output stage designed to source or sink high peak current. The output stage, suitable for driving N-Channel MOSFETs, is low in the off-state.

Differences between members of this family are the under-voltage lockout thresholds and maximum duty cycle ranges. The UC2842B and UC2844B have UVLO thresholds of 16V (on) and 10V (off), ideally suited off-line applications The corresponding thresholds for the UC2843B and UC2845B are 8.5V and 7.9V. The UC2842B and UC2843B can operate to duty cycles approaching 100%. A range of the zero to < 50 % is obtained by the UC2844B and UC2845B by the addition of an internal toggle flip flop which blanks the output off every other clock cycle.

  • 所有功能

    • LOW START-UP AND OPERATING CURRENT
    • UNDERVOLTAGE LOCKOUT WITH HYSTERESIS
    • INTERNALLY TRIMMED REFERENCE WITH UNDERVOLTAGE LOCKOUT
    • CURRENT LIMITING
    • TRIMMED OSCILLATOR FOR PRECISE FREQUENCY CONTROL
    • CURRENT MODE OPERATION TO 500kHz
    • OSCILLATOR FREQUENCY GUARANTEED AT 250kHz
    • LATCHING PWM FOR CYCLE-BY-CYCLE
    • HIGH CURRENT TOTEM POLE OUTPUT
    • AUTOMATIC FEED FORWARD COMPENSATION

电路原理图

EDA符号、封装和3D模型

STMicroelectronics - UC3844B

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3D模型

质量与可靠性

产品型号 Marketing Status 封装 等级规格 符合RoHS级别 材料声明**
UC3844BD1
批量生产
SO-8 工业 Ecopack2
UC3844BD1013TR
批量生产
SO-8 工业 Ecopack2
UC3844BN
批量生产
DIP-8 工业 Ecopack2

UC3844BD1

Package:

SO-8

Material Declaration**:

Marketing Status

批量生产

Package

SO-8

Grade

Industrial

RoHS Compliance Grade

Ecopack2

UC3844BD1013TR

Package:

SO-8

Material Declaration**:

Marketing Status

批量生产

Package

SO-8

Grade

Industrial

RoHS Compliance Grade

Ecopack2

UC3844BN

Package:

DIP-8

Material Declaration**:

Marketing Status

批量生产

Package

DIP-8

Grade

Industrial

RoHS Compliance Grade

Ecopack2

(**) st.com上提供的材料声明表单可能是基于包装系列中最常用的封装的通用文档。因此,它们可能不是100%适用于特定的设备。有关特定设备的信息,请联系 销售支持

样片和购买

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产品型号
Order from distributors
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供货状态
ECCN (US)
ECCN (EU)
包装类型
封装
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最小值
最大值
UC3844BD1 Available at distributors

经销商的可用性 UC3844BD1

代理商名称
地区 库存 最小订购量 第三方链接

代理商库存报告日期:

无法联系到经销商,请联系我们的销售办事处
批量生产
EAR99 NEC Tube SO-8 - - MOROCCO
UC3844BD1013TR Available at distributors

经销商的可用性 UC3844BD1013TR

代理商名称
地区 库存 最小订购量 第三方链接

代理商库存报告日期:

无法联系到经销商,请联系我们的销售办事处
批量生产
EAR99 NEC Tape and Reel SO-8 - - MOROCCO
UC3844BN Available at distributors

经销商的可用性 UC3844BN

代理商名称
地区 库存 最小订购量 第三方链接

代理商库存报告日期:

无法联系到经销商,请联系我们的销售办事处
批量生产
EAR99 NEC Tube DIP-8 - - CHINA

UC3844BD1 批量生产

封装:
SO-8
ECCN (US):
EAR99
Budgetary Price (US$)*/Qty:
-

产品型号:

UC3844BD1

ECCN (EU):

NEC

包装类型:

Tube

Operating Temperature (°C)

Min:

-

Max:

-

Country of Origin:

MOROCCO

代理商名称

代理商库存报告日期:

UC3844BD1013TR 批量生产

封装:
SO-8
ECCN (US):
EAR99
Budgetary Price (US$)*/Qty:
-

产品型号:

UC3844BD1013TR

ECCN (EU):

NEC

包装类型:

Tape and Reel

Operating Temperature (°C)

Min:

-

Max:

-

Country of Origin:

MOROCCO

代理商名称

代理商库存报告日期:

UC3844BN 批量生产

封装:
DIP-8
ECCN (US):
EAR99
Budgetary Price (US$)*/Qty:
-

产品型号:

UC3844BN

ECCN (EU):

NEC

包装类型:

Tube

Operating Temperature (°C)

Min:

-

Max:

-

Country of Origin:

CHINA

代理商名称

代理商库存报告日期:

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(*) 建议转售单价(美元)仅用于预算用途。如需以当地货币计价的报价,请联系您当地的 ST销售办事处 或我们的 经销商