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Utsource certified used parts
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1. Utsource will inspect the goods, including appearance inspection (no serious damage to the appearance), select qualified and honest suppliers, and ensure 98% qualification rate.
2. Some parts are tested by machine.
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Description
HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER
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● TRIMMED OSCILLATOR FOR PRECISE FREQUENCY CONTROL
● OSCILLATOR FREQUENCYGUARANTEED AT 250kHz
● CURRENT MODE OPERATION TO 500kHz
● AUTOMATIC FEED FORWARD COMPENSATION
● LATCHINGPWM 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 OPERATINGCURRENT
DESCRIPTION
The UC384xB family of control lCs 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 than0.5mA, 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 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 8.5V and 7.9V. The UC3842B and UC3843B can operate to duty cycles approaching 100%. A range of the zero to < 50 % is obtained by the UC3844Band UC3845Bby the addition of an internal toggle flip flop which blanks the output off every other clock cycle.
Preview of the first 3 pages of the data sheet
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241 buyer reviews from United Kingdom
Jamie
Length of registration:3 years
All working fine, great quality! Fast shipment and great price! Totally recommended!
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12/07/2022
FOUNDRY ARIENTE SA
Length of registration:15 years
Thank you very much to the seller all delivered on time and the goods correspond to the description. Measured some, and are within the standard.
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11/11/2022
Paul
Length of registration:13 years
The things I bought are very satisfactory and practical
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10/17/2022
phil simmons
Length of registration:9 years
nice components
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10/17/2017
John Connolly
Length of registration:9 years
High quality components and excellent fast service.
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01/09/2017
Lance Welsh
Length of registration:11 years
Excellent service
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12/29/2016
Neil Walkley
Length of registration:8 years
Received in good condition
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11/30/2016
C.B.Ashmore
Length of registration:7 years
Excellent service, may thanks
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11/24/2016
Gary Beddows
Length of registration:7 years
Fantastic
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09/19/2016
Robert
Length of registration:7 years
Excellent really pleased i have now repaired my Pioneer av receiver. Many Thanks You guys. Don,t listen to the lies on the net. great service and people. Robert
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09/13/2016
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UC3845BN
UC3845BN has several brands around the world that may have alternate names for UC3845BN due to regional differences or acquisition. UC3845BN may also be known as the following names:
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Stop production experts, we can provide a large number of electronic components that have been stopped production and are difficult to find, to facilitate the maintenance company
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