Produkte > Integrierte Schaltungen (ICs) > UC2843B

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UC2843B

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High Performance Current Mode Controllers

Hersteller : STMicroelectronics, Inc
Verpackung/Behälter : SOP-8
Produkt der Kategorien : Power Management ; AC-DC Converters ; PWM Controllers
Datasheet: UC2843B Datasheet (PDF)
RoHs Status: Lead free / RoHS Compliant
Lagerbestand: 188

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UC2843B Beschreibung

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.

UC2843B

Feature

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

UC2843B Block Diagram
(Bild: Diagram)

Technische Parameter

  • Grade
  • Industrial
  • Input duty cycle voltage (V) min
  • 8.2
  • Input duty cycle voltage (V) max
  • 30
  • Output Current Max (A) nom
  • 1
  • Regulated Output Voltage (V) min
  • -
  • Regulated Output Voltage (V) max
  • -
  • Regulator Switching frequency max
  • 500
  • Max Duty Cycle (%) typ
  • 100
  • Topology
  • Current Mode
  • Synchronize Frequency
  • false
  • Current Limiting Mode
  • pulse
  • Disable Pin
  • false
  • Stand by Pin
  • false

UC2843B Datasheet

UC2843B Äquivalente Teile

Für die UC2843B-Komponente können Sie diese Ersatz- und Alternativteile in Betracht ziehen.

Models Hersteller Verpackung/Behälter Beschreibung
UC3843 ON DIP8

UC2843B Verwandte besondere

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  • 7-30 days

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We will inspect all the goods before shipment,ensure all the products at good condition and ensure the parts are new originalmatch datasheet.

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1.The electronic components you purchase include 365 Days Warranty, We guarantee product quality.

2.If some of the items you received aren't of perfect quality, we would resiponsibly arrange your refund or replacement. But the items must remain their orginal condition.

FAQ:

Q: How does Jotrin guarantee that UC2843B is the original manufacturer or agent of ST?
We have a professional business development department to strictly test and verify the qualifications of ST original manufacturers and agents. All ST suppliers must pass the qualification review before they can publish their UC2843B devices; we pay more attention to the channels and quality of UC2843B products than any other customer. We strictly implement supplier audits, so you can purchase with confidence.
Q: How to find the detailed information of UC2843B chips? Including ST original factory information, Power Management ; AC-DC Converters ; PWM Controllers application, UC2843B pictures?
You can use Jotrin's intelligent search engine, or filter by Power Management ; AC-DC Converters ; PWM Controllers category, or find it through STMicroelectronics, Inc Information page.
Q: Are the ST's UC2843B price and stock displayed on the platform accurate?
The ST's inventory fluctuates greatly and cannot be updated in time, it will be updated periodically within 24 hours. After submitting an order for UC2843B, it is recommended to confirm the order with Jotrin salesperson or online customer service before payment.
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Note: It may take up to 24 hours before carriers will display tracking information. In normal conditions, Express delivery needs 3-5 days, Registered Mail needs 25-60 days.
Q: What is the process for returns or replacement of UC2843B?
All goods will implement Pre-Shipment Inspection (PSI), selected at random from all batches of your order to do a systematic inspection before arranging the shipment. If there is something wrong with the UC2843B we delivered, we will accept the replacement or return of the UC2843B only when all of the below conditions are fulfilled:
(1)Such as a deficiency in quantity, delivery of wrong items, and apparent external defects (breakage and rust, etc.), and we acknowledge such problems.
(2)We are informed of the defect described above within 90 days after the delivery of UC2843B.
(3)The UC2843B is unused and only in the original unpacked packaging.
Two processes to return the products:
(1)Inform us within 90 days
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More details about return electronic components please see our Return & Change Policy.
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STMicroelectronics, Inc

ST
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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