UC2844B

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Current Mode PWM

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  • 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.

    主要特性

    • 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

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UC2844BD1 SO-8 Tube
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UC2844BD1013TR SO-8 Tape And Reel
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UC2844BD1

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SO-8

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UC2844BD1013TR

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SO-8

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Tape And Reel

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0.3312*

Distributor availability ofUC2844BD1013TR

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346

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2500

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2500

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Newark Element14

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EAR99

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MOROCCO

UC2844BN

封装

DIP-8

包装类型

Tube

单价(US$)

0.3312*

Distributor availability ofUC2844BN

代理商名称
地区 库存 最小订购量 Third party link
DIGIKEY WORLDWIDE 1890 1 Order Now
RS COMPONENTS EUROPE 190 10 Order Now
AVNET AMERICA 1000 0 Order Now
ARROW EUROPE 18753 0 Order Now
Newark Element14 AMERICA 277 0 Order Now
ARROW AMERICA 1896 2000 Order Now
MOUSER WORLDWIDE 2161 1 Order Now
Farnell Element14 EUROPE 396 1 Order Now
RUTRONIK EUROPE 1850 50 Order Now

代理商库存报告日期: 2020-01-16

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库存

1890

Min.Order

1

地区

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RS COMPONENTS

库存

190

Min.Order

10

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EUROPE Order Now

AVNET

库存

1000

Min.Order

0

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18753

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0

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1896

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2000

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Farnell Element14

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396

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50

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单价(US$)

0.3312

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1000

ECCN (US)

EAR99

Country of Origin

MALAYSIA

(*) 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

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UC2844BD1
批量生产
SO-8 工业 Ecopack2
UC2844BD1013TR
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SO-8 工业 Ecopack2
UC2844BN
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UC2844BD1

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SO-8

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UC2844BN

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DIP-8

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