Products > Integrated Circuits (ICs) > Power Management ICs > UC2844BD1013TR

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UC2844BD1013TR

High performance current mode PWM controller,Current Mode PWM Controllers 0.5mA Current Mode

Manufacturer : STMicroelectronics, Inc
Package/Case : SO-8
Product Categories : Current Mode PWM Controllers
Datasheet: UC2844BD1013TR Datasheet (PDF)
RoHs Status: Rohs
In-stock: 1775

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UC2844BD1013TR Product Details

DESCRIPTION

The UC384xB 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 offstate.

Differences between members of this family are the under-voltage lockout thresholds and maximum duty cycle ranges. The UC3842B and UC3844B have UVLO thresholds of 16V (on) and 10V (off), ideally suited off-line applications The corresponding thresholds for the UC3843B and UC3845B are 8.5 V and 7.9 V. The UC3842B and UC3843B can operate to duty cycles approaching 100%. A range of the zero to < 50 % is obtained by the UC3844B and UC3845B by the addition of an internal toggle flip flop which blanks the output off every other clock cycle.

FEATURES 

  • TRIMMED OSCILLATOR FOR PRECISE FREQUENCY CONTROL 
  • OSCILLATOR FREQUENCY GUARANTEED AT 250kHz 
  • CURRENT MODE OPERATION TO 500kHz 
  • AUTOMATIC FEED FORWARD COMPENSATION 
  • LATCHING PWM FOR CYCLE-BY-CYCLE CURRENT LIMITING 
  • INTERNALLY TRIMMED REFERENCE WITH UNDERVOLTAGE LOCKOUT 
  • HIGH CURRENT TOTEM POLE OUTPUT 
  • UNDERVOLTAGE LOCKOUT WITH HYSTERESIS 
  • LOW START-UP AND OPERATING CURRENT

UC2844BD1013TR

Feature

  • LOWSTART-UPANDOPERATINGCURRENT
  • UNDERVOLTAGELOCKOUTWITHHYSTERESIS
  • INTERNALLYTRIMMEDREFERENCEWITHUNDERVOLTAGELOCKOUT
  • CURRENTLIMITING
  • TRIMMEDOSCILLATORFORPRECISEFREQUENCYCONTROL
  • CURRENTMODEOPERATIONTO500kHz
  • OSCILLATORFREQUENCYGUARANTEEDAT250kHz
  • LATCHINGPWMFORCYCLE-BY-CYCLE
  • HIGHCURRENTTOTEMPOLEOUTPUT
  • AUTOMATICFEEDFORWARDCOMPENSATION

UC2844BD1013TR Pinout
(Picture: Pinout)

UC2844BD1013TR Block Diagram
(Picture: Diagram)

Technical Parameters

  • Switching Frequency
  • 500 kHz
  • Rise Time
  • 50 ns
  • Fall Time
  • 50 ns
  • Operating Supply Voltage
  • 30 V
  • Number of Outputs
  • 1
  • Maximum Operating Temperature
  • + 150 C
  • Mounting Style
  • SMD/SMT
  • Package / Case
  • SO-8
  • Minimum Operating Temperature
  • - 40 C
  • Output Current
  • 1000 mA
  • Output Voltage
  • 4.95 V to 5.05 V
  • Packaging
  • Reel
  • Factory Pack Quantity
  • 2500
  • Topology
  • Boost, Flyback

UC2844BD1013TR Datasheet

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STMicroelectronics, Inc

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ST Microelectronics is a global independent semiconductor company and a leader in developing and delivering semiconductor solutions across the spectrum of microelectronics applications, and that designs, develops, manufactures and markets a broad spectrum of products....
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