UC2843B

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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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UC2843BD1013TR SO-8 Tape And Reel
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UC2843BD1013TR

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0.3312*

Distributor availability ofUC2843BD1013TR

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1000

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MOROCCO

UC2843BN

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DIP-8

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Tube

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0.3312*

Distributor availability ofUC2843BN

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DIGIKEY WORLDWIDE 481 1 Order Now
AVNET AMERICA 2000 0 Order Now
FUTURE WORLDWIDE 20 1 Order Now
ARROW EUROPE 3520 0 Order Now
Newark Element14 AMERICA 430 0 Order Now
MOUSER WORLDWIDE 1992 1 Order Now
Farnell Element14 EUROPE 2022 1 Order Now
ANGLIA Live EUROPE 850 1 Order Now
RUTRONIK EUROPE 12000 50 Order Now

代理商库存报告日期: 2020-01-16

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DIGIKEY

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481

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1

地区

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AVNET

库存

2000

Min.Order

0

地区

AMERICA Order Now

FUTURE

库存

20

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1

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ARROW

库存

3520

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1992

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Farnell Element14

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2022

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ANGLIA Live

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850

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UC2843BD1

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SO-8

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Tube

单价(US$)

0.3312*

Distributor availability ofUC2843BD1

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DIGIKEY WORLDWIDE 1989 1 Order Now
COMPEL EUROPE 505 1 Order Now
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MOUSER WORLDWIDE 2651 1 Order Now
Farnell Element14 EUROPE 1482 1 Order Now
ANGLIA Live EUROPE 960 1 Order Now

代理商库存报告日期: 2020-01-16

代理商名称

DIGIKEY

库存

1989

Min.Order

1

地区

WORLDWIDE Order Now

COMPEL

库存

505

Min.Order

1

地区

EUROPE Order Now

RS COMPONENTS

库存

1430

Min.Order

10

地区

EUROPE Order Now

ARROW

库存

4001

Min.Order

0

地区

EUROPE Order Now

MOUSER

库存

2651

Min.Order

1

地区

WORLDWIDE Order Now

Farnell Element14

库存

1482

Min.Order

1

地区

EUROPE Order Now

ANGLIA Live

库存

960

Min.Order

1

地区

EUROPE Order Now

代理商库存报告日期: 2020-01-16

供货状态

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单价(US$)

0.3312

数量

1000

ECCN (US)

EAR99

Country of Origin

MOROCCO

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UC2843BD1
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SO-8 工业 Ecopack2
UC2843BD1013TR
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