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  • UC3845BDT(3845B)
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UC3845BDT(3845B)

Current Mode PWM

Manufacturer : STMicroelectronics, Inc
Package/Case : SOP8
Product Categories : Power Management ; AC-DC Converters ; PWM Controllers
Datasheet: UC3845BDT(3845B) Datasheet (PDF)
RoHs Status: Lead free/RoHS Compliant
In-stock: 10

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UC3845BDT(3845B) Product Details

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.

Feature

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

UC3845BDT(3845B) Block Diagram
(Picture: Diagram)

Technical Parameters

  • 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
  • 50
  • Topology
  • Current Mode
  • Synchronize Frequency
  • false
  • Current Limiting Mode
  • pulse
  • Disable Pin
  • false
  • Stand by Pin
  • false

UC3845BDT(3845B) Datasheet

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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 UC3845BDT(3845B) devices; we pay more attention to the channels and quality of UC3845BDT(3845B) products than any other customer. We strictly implement supplier audits, so you can purchase with confidence.
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(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 UC3845BDT(3845B).
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