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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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UC2845BD1013TR SO-8 Tape And Reel
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UC2845BN DIP-8 Tube
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UC2845BD1 SO-8 Tube
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UC2845BD1013TR

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SO-8

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Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 1470 1 Order Now
FUTURE WORLDWIDE 2500 2500 Order Now
Newark Element14 AMERICA 5 0 Order Now
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Distributor reported inventory date: 2019-09-18

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DIGIKEY

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1470

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1

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WORLDWIDE Order Now

FUTURE

Stock

2500

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2500

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Newark Element14

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5

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0

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AMERICA Order Now

ARROW

Stock

22533

Min.Order

1

Region

AMERICA Order Now

MOUSER

Stock

2003

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1

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Stock

2500

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2500

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Distributor reported inventory date: 2019-09-18

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Unit Price (US$)

0.3312

Quantity

1000

ECCN (US)

EAR99

Country of Origin

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UC2845BN

Package

DIP-8

Packing Type

Tube

Unit Price (US$)

0.3312*

Distributor availability ofUC2845BN

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Region Stock Min. Order Third party link
RS COMPONENTS EUROPE 380 10 Order Now
AVNET AMERICA 2000 0 Order Now
FUTURE WORLDWIDE 2000 50 Order Now
ARROW EUROPE 100 0 Order Now
Newark Element14 AMERICA 139 0 Order Now
ARROW AMERICA 65 2000 Order Now
MOUSER WORLDWIDE 5117 1 Order Now
Farnell Element14 EUROPE 2257 1 Order Now
RUTRONIK EUROPE 4000 50 Order Now

Distributor reported inventory date: 2019-09-18

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RS COMPONENTS

Stock

380

Min.Order

10

Region

EUROPE Order Now

AVNET

Stock

2000

Min.Order

0

Region

AMERICA Order Now

FUTURE

Stock

2000

Min.Order

50

Region

WORLDWIDE Order Now

ARROW

Stock

100

Min.Order

0

Region

EUROPE Order Now

Newark Element14

Stock

139

Min.Order

0

Region

AMERICA Order Now

ARROW

Stock

65

Min.Order

2000

Region

AMERICA Order Now

MOUSER

Stock

5117

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

2257

Min.Order

1

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Stock

4000

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50

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Distributor reported inventory date: 2019-09-18

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Unit Price (US$)

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Quantity

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ECCN (US)

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Country of Origin

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UC2845BD1

Package

SO-8

Packing Type

Tube

Unit Price (US$)

0.3312*

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Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 3620 1 Order Now
RS COMPONENTS EUROPE 1570 10 Order Now
ARROW EUROPE 598 0 Order Now
MOUSER WORLDWIDE 3294 1 Order Now

Distributor reported inventory date: 2019-09-18

Distributor Name

DIGIKEY

Stock

3620

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

1570

Min.Order

10

Region

EUROPE Order Now

ARROW

Stock

598

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

3294

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2019-09-18

Marketing Status

Active

Unit Price (US$)

0.3312

Quantity

1000

ECCN (US)

EAR99

Country of Origin

MOROCCO

(*) 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**
UC2845BD1
Active
SO-8 Industrial Ecopack2
UC2845BD1013TR
Active
SO-8 Industrial Ecopack2
UC2845BN
Active
DIP-8 Industrial Ecopack2

UC2845BD1

Package:

SO-8

Material Declaration**:

Marketing Status

Active

Package

SO-8

Grade

Industrial

RoHS Compliance Grade

Ecopack2

UC2845BD1013TR

Package:

SO-8

Material Declaration**:

Marketing Status

Active

Package

SO-8

Grade

Industrial

RoHS Compliance Grade

Ecopack2

UC2845BN

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.