UC3842B

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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.

    Key Features

    • 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

Circuit Diagram

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UC3842BD1013TR

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DIGIKEY WORLDWIDE 2229 1 Order Now
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517

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1947

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1

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3850

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2500

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2500

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UC3842BD1

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0.2772 / 1k

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DIGIKEY WORLDWIDE 1436 1 Order Now
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Distributor reported inventory date: 2020-04-06

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1436

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1

Region

WORLDWIDE Order Now

ARROW

Stock

1232

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0

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EUROPE Order Now

Newark Element14

Stock

170

Min.Order

0

Region

AMERICA Order Now

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Stock

2070

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1

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WORLDWIDE Order Now

Farnell Element14

Stock

1687

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1

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EUROPE Order Now

Distributor reported inventory date: 2020-04-06

Marketing Status

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Budgetary Price (US$)* / Qty

0.2772 / 1k

ECCN (US)

EAR99

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MOROCCO

UC3842BN

Package

DIP-8

Packing Type

Tube

Budgetary Price (US$)*/Qty

0.2772 / 1k

Distributor availability ofUC3842BN

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2395 1 Order Now
COMPEL EUROPE 3970 1 Order Now
RS COMPONENTS EUROPE 1820 10 Order Now
ARROW EUROPE 420 0 Order Now
Newark Element14 AMERICA 10 0 Order Now
ARROW AMERICA 850 2000 Order Now
MOUSER WORLDWIDE 4249 1 Order Now
Farnell Element14 EUROPE 1045 1 Order Now
RUTRONIK EUROPE 6050 50 Order Now

Distributor reported inventory date: 2020-04-06

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DIGIKEY

Stock

2395

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1

Region

WORLDWIDE Order Now

COMPEL

Stock

3970

Min.Order

1

Region

EUROPE Order Now

RS COMPONENTS

Stock

1820

Min.Order

10

Region

EUROPE Order Now

ARROW

Stock

420

Min.Order

0

Region

EUROPE Order Now

Newark Element14

Stock

10

Min.Order

0

Region

AMERICA Order Now

ARROW

Stock

850

Min.Order

2000

Region

AMERICA Order Now

MOUSER

Stock

4249

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1

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Stock

1045

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1

Region

EUROPE Order Now

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Stock

6050

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50

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EUROPE Order Now

Distributor reported inventory date: 2020-04-06

Marketing Status

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Budgetary Price (US$)* / Qty

0.2772 / 1k

ECCN (US)

EAR99

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-

(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office  or our Distributors

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Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
UC3842BD1
Active
SO-8 Industrial Ecopack2
UC3842BD1013TR
Active
SO-8 Industrial Ecopack2
UC3842BN
Active
DIP-8 Industrial Ecopack2

UC3842BD1

Package:

SO-8

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SO-8

Grade

Industrial

RoHS Compliance Grade

Ecopack2

UC3842BD1013TR

Package:

SO-8

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SO-8

Grade

Industrial

RoHS Compliance Grade

Ecopack2

UC3842BN

Package:

DIP-8

Material Declaration**:

PDF XML

Marketing Status

Active

Package

DIP-8

Grade

Industrial

RoHS Compliance Grade

Ecopack2

(**) The Material Declaration forms available on st.com may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.

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