Product overview

Description

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.

  • All 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

EDA Symbols, Footprints and 3D Models

STMicroelectronics - UC2842B

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3D models

Quality and Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
UC2842BD1
Active
SO-8 Industrial Ecopack2
UC2842BD1013TR
Active
SO-8 Industrial Ecopack2
UC2842BN
Active
DIP-8 Industrial Ecopack2

UC2842BD1

Package:

SO-8

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SO-8

Grade

Industrial

RoHS Compliance Grade

Ecopack2

UC2842BD1013TR

Package:

SO-8

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SO-8

Grade

Industrial

RoHS Compliance Grade

Ecopack2

UC2842BN

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.

Sample & Buy

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Part Number
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Budgetary Price (US$)*/Qty
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Packing Type
RoHS
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ECCN (US)
ECCN (EU)
Temperature (°C)
Operating Temperature (°C) (min)
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UC2842BN
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Distributor availability of UC2842BN

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DIP-8 Tube CHINA EAR99 NEC - -

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UC2842BD1
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SO-8 Tube MOROCCO EAR99 NEC - -

-

UC2842BD1013TR
Available at distributors

Distributor availability of UC2842BD1013TR

Distributor Name
Region Stock Min. Order Third party link

Distributor reported inventory date:

No availability of distributors reported, please contact our sales office
SO-8 Tape and Reel MOROCCO EAR99 NEC - -

-

UC2842BN Active

Budgetary Price (US$)*/Qty:
-
Package:
DIP-8
Packing Type:
Tube
RoHS:
-
Country of Origin:
CHINA
ECCN (US):
EAR99
ECCN (EU):
NEC

Part Number:

UC2842BN

Operating Temperature (°C)

Min:

-

Max:

-

Distributor Name

Distributor reported inventory date:

UC2842BD1 Active

Budgetary Price (US$)*/Qty:
-
Package:
SO-8
Packing Type:
Tube
RoHS:
-
Country of Origin:
MOROCCO
ECCN (US):
EAR99
ECCN (EU):
NEC

Part Number:

UC2842BD1

Operating Temperature (°C)

Min:

-

Max:

-

Distributor Name

Distributor reported inventory date:

UC2842BD1013TR Active

Budgetary Price (US$)*/Qty:
-
Package:
SO-8
Packing Type:
Tape and Reel
RoHS:
-
Country of Origin:
MOROCCO
ECCN (US):
EAR99
ECCN (EU):
NEC

Part Number:

UC2842BD1013TR

Operating Temperature (°C)

Min:

-

Max:

-

Distributor Name

Distributor reported inventory date:

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