Products > Integrated Circuits (ICs) > Power Management ICs > UC3844N

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UC3844N

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CURRENT MODE PWM CONTROLLER, 25V, Input Voltage:25V, Output Voltage:13.5V, Output Current:1A, Supply Voltage Min:12V, Supply Voltage Max:25V,Frequency:450kHz

  • Manufacturer :
  • TI/FAIRCHILD/ON/MOTOROLA
  • Package/Case :
  • DIP-8
  • Product Categories :
  • Current Mode PWM Controllers
  • RoHs Status:
  • Lead free / RoHS Compliant
  • Marking Code:
  • UC3844N
  • In-stock:
  • 691

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UC3844N Product Details

The UCx84x series of control integrated circuits provide the features that are necessary to implement off-line or DC-to-DC fixed-frequency current-mode control schemes, with a minimum number of external components. The internally implemented circuits include an undervoltage lockout (UVLO), featuring a start-up current of less than 1 mA, and a precision reference trimmed for accuracy at the error amplifier input. Other internal circuits include logic to ensure latched operation, a pulse-width modulation (PWM) comparator that also provides current-limit control, and a totem-pole output stage that is designed to source or sink high-peak current. The output stage, suitable for driving N-channel MOSFETs, is low when it is in the off state.

The UCx84x family offers a variety of package options, temperature range options, choice of maximum duty cycle, and choice of turnon and turnoff thresholds and hysteresis ranges. Devices with higher turnon or turnoff hysteresis are ideal choices for off-line power supplies, while the devices with a narrower hysteresis range are suited for DC-DC applications. The UC184x devices are specified for operation from –55°C to 125°C, the UC284x series is specified for operation from –40°C to 85°C, and the UC384x series is specified for operation from 0°C to 70°C.

UC3844N

Feature

  • Optimized for Off-Line and DC-to-DC Converters
  • Low Start-Up Current (< 1 mA)
  • Automatic Feedforward Compensation
  • Pulse-by-Pulse Current Limiting
  • Enhanced Load-Response Characteristics
  • Undervoltage Lockout With Hysteresis
  • Double-Pulse Suppression
  • High-Current Totem-Pole Output
  • Internally Trimmed Bandgap Reference
  • Up to 500-kHz Operation
  • Error Amplifier With Low Output Resistance
Description

The UCx84x series of control integrated circuits provide the features that are necessary to implement off-line or DC-to-DC fixed-frequency current-mode control schemes, with a minimum number of external components. The internally implemented circuits include an undervoltage lockout (UVLO), featuring a start-up current of less than 1 mA, and a precision reference trimmed for accuracy at the error amplifier input. Other internal circuits include logic to ensure latched operation, a pulse-width modulation (PWM) comparator that also provides current-limit control, and a totem-pole output stage that is designed to source or sink high-peak current. The output stage, suitable for driving N-channel MOSFETs, is low when it is in the off state.

The UCx84x family offers a variety of package options, temperature range options, choice of maximum duty cycle, and choice of turnon and turnoff thresholds and hysteresis ranges. Devices with higher turnon or turnoff hysteresis are ideal choices for off-line power supplies, while the devices with a narrower hysteresis range are suited for DC-DC applications. The UC184x devices are specified for operation from –55°C to 125°C, the UC284x series is specified for operation from –40°C to 85°C, and the UC384x series is specified for operation from 0°C to 70°C.

UC3844N Products

Technical Parameters

  • Switching Frequency
  • 500 kHz
  • Rise Time
  • 50 ns
  • Fall Time
  • 50 ns
  • Number of Outputs
  • 1
  • Maximum Operating Temperature
  • + 70 C
  • Mounting Style
  • Through Hole
  • Package / Case
  • PDIP-8
  • Minimum Operating Temperature
  • 0 C
  • Output Current
  • 1000 mA
  • Packaging
  • Tube
  • Factory Pack Quantity
  • 50
  • Topology
  • Boost, Buck, Flyback, Forward

UC3844N Documents

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FAQ:

Q: How does Jotrin guarantee that UC3844N is the original manufacturer or agent of TI/FAIRCHILD/ON/MOTOROLA?
We have a professional business development department to strictly test and verify the qualifications of TI/FAIRCHILD/ON/MOTOROLA original manufacturers and agents. All TI/FAIRCHILD/ON/MOTOROLA suppliers must pass the qualification review before they can publish their UC3844N devices; we pay more attention to the channels and quality of UC3844N products than any other customer. We strictly implement supplier audits, so you can purchase with confidence.
Q: How to find the detailed information of UC3844N chips? Including TI/FAIRCHILD/ON/MOTOROLA original factory information, Current Mode PWM Controllers application, UC3844N pictures?
You can use Jotrin's intelligent search engine, or filter by Semiconductors ; Power management ; Offline & isolated DC/DC controllers & converters category, or find it through TI/FAIRCHILD/ON/MOTOROLA brand manufacturer page.
Q: Are the TI/FAIRCHILD/ON/MOTOROLA's UC3844N price and stock displayed on the platform accurate?
The TI/FAIRCHILD/ON/MOTOROLA's inventory fluctuates greatly and cannot be updated in time, it will be updated periodically within 24 hours. After submitting an order for UC3844N, it is recommended to confirm the order with Jotrin salesperson or online customer service before payment.
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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 UC3844N we delivered, we will accept the replacement or return of the UC3844N 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 UC3844N.
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More details about return electronic components please see our Return & Change Policy.
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