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UC2845ADM vs UC3845ADM vs UC3843ADM Comparison

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    UC2845ADM
    UC2845ADM
    UC3845ADM
    UC3845ADM
    UC3843ADM
    UC3843ADM
  • Part No.
    UC2845ADM
    UC3845ADM
    UC3843ADM
  • Description
    AC to DC Switching Converter Flyback 500kHz 8Pin SOIC
    AC to DC Switching Converter Flyback 500kHz 8Pin SOIC
    AC to DC Switching Converter Flyback 500kHz 8Pin SOIC
  • Manufacturer
    Microsemi
    Microsemi
    Microsemi
  • Classification
    Voltage Regulators
    Voltage Regulators
    AC-DC Converters
  • Reference Price(USD)
    $2.299
    $1.776
    $1.234
  • Inventory(pcs)
    2.9k
    5.1k
    0
  • Case/Package
    SOIC-8
    SOIC-8
    SOIC-8
  • Number of Pins
    8
    8
    8
  • Rise Time
    50 ns
    -
    50 ns
  • Output Voltage
    5 V
    -
    5 V
  • Switching Frequency
    500 kHz
    500 kHz
    500 kHz
  • Supply Voltage (DC)
    30.0 V
    30.0 V
    30.0 V
  • Threshold Voltage
    -
    -
    17.5 V
  • Duty Cycle
    -
    50 %
    -
  • Number of Outputs
    1
    1
    1
  • Quiescent Current
    11.0 mA
    11.0 mA
    11.0 mA
  • Operating Temperature
    -40℃ ~ 85℃ (TA)
    0℃ ~ 70℃ (TA)
    0℃ ~ 70℃ (TA)
  • Size-Height
    -
    1.75 mm
    -
  • Mounting Style
    Surface Mount
    Surface Mount
    Surface Mount
  • Packaging
    Tube
    Tube
    Tube
  • Lead-Free Status
    Lead Free
    Lead Free
    Lead Free
  • RoHS
    RoHS Compliant
    RoHS Compliant
    RoHS Compliant
  • Product Lifecycle Status
    Active
    Active
    Active
  • Operating Temperature (Max)
    85 ℃
    -
    70 ℃
  • Operating Temperature (Min)
    -40 ℃
    -
    0 ℃
  • Power Dissipation (Max)
    1000 mW
    -
    1000 mW
  • Maximum Duty Cycle
    0.48
    0.48
    96 %
  • Supply Voltage
    -
    8.2V ~ 25V
    30 V
  • Fall Time
    50 ns
    -
    50 ns
  • Overview
    UC2845ADM Product overview

    DESCRIPTION The UC184xA family of control ICs provides all the necessary features to implement off-line fixed-frequency, current-mode switching power supplies with a minimum of external components. The current mode architecture demonstrates improved load regulation, pulse-by-pulse current limiting and inherent protection of the power supply output switch. The IC includes: A bandgap reference trimmed to ±1% accuracy, an error amplifier, a current sense comparator with internal clamp to 1V, a high current totem pole output stage for fast switching of power MOSFET"s, and an externally programmable oscillator to set frequency and maximum duty cycle. The undervoltage lock-out is designed to operate with 250µA typ. start-up current, allowing an efficient bootstrap supply voltage design. KEY FEATURES ■ LOW START-UP CURRENT. (0.5mA max.) ■ TRIMMED OSCILLATOR DISCHARGE CURRENT. (See Product Highlight) ■ OPTIMIZED FOR OFF-LINE AND DC-TO-DC CONVERTERS. ■ AUTOMATIC FEED FORWARD COMPENSATION. ■ PULSE-BY-PULSE CURRENT LIMITING. ■ ENHANCED LOAD RESPONSE CHARACTERISTICS. ■ UNDER-VOLTAGE LOCKOUT WITH HYSTERESIS. ■ DOUBLE PULSE SUPPRESSION. ■ HIGH-CURRENT TOTEM POLE OUTPUT. ■ INTERNALLY TRIMMED BANDGAP REFERENCE. ■ 500KHz OPERATION. ■ LOW RO ERROR AMPLIFIER. APPLICATIONS ■ ECONOMICAL OFF-LINE FLYBACK OR FORWARD CONVERTERS. ■ DC-DC BUCK OR BOOST CONVERTERS. ■ LOW COST DC MOTOR CONTROL.

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    UC3845ADM Product overview

    DESCRIPTION The UC184xA family of control ICs provides all the necessary features to implement off-line fixed-frequency, current-mode switching power supplies with a minimum of external components. The current mode architecture demonstrates improved load regulation, pulse-by-pulse current limiting and inherent protection of the power supply output switch. The IC includes: A bandgap reference trimmed to ±1% accuracy, an error amplifier, a current sense comparator with internal clamp to 1V, a high current totem pole output stage for fast switching of power MOSFET"s, and an externally programmable oscillator to set frequency and maximum duty cycle. The undervoltage lock-out is designed to operate with 250µA typ. start-up current, allowing an efficient bootstrap supply voltage design. KEY FEATURES ■ LOW START-UP CURRENT. (0.5mA max.) ■ TRIMMED OSCILLATOR DISCHARGE CURRENT. (See Product Highlight) ■ OPTIMIZED FOR OFF-LINE AND DC-TO-DC CONVERTERS. ■ AUTOMATIC FEED FORWARD COMPENSATION. ■ PULSE-BY-PULSE CURRENT LIMITING. ■ ENHANCED LOAD RESPONSE CHARACTERISTICS. ■ UNDER-VOLTAGE LOCKOUT WITH HYSTERESIS. ■ DOUBLE PULSE SUPPRESSION. ■ HIGH-CURRENT TOTEM POLE OUTPUT. ■ INTERNALLY TRIMMED BANDGAP REFERENCE. ■ 500KHz OPERATION. ■ LOW RO ERROR AMPLIFIER. APPLICATIONS ■ ECONOMICAL OFF-LINE FLYBACK OR FORWARD CONVERTERS. ■ DC-DC BUCK OR BOOST CONVERTERS. ■ LOW COST DC MOTOR CONTROL.

    View all
    UC3843ADM Product overview

    DESCRIPTION The UC184xA family of control ICs provides all the necessary features to implement off-line fixed-frequency, current-mode switching power supplies with a minimum of external components. The current mode architecture demonstrates improved load regulation, pulse-by-pulse current limiting and inherent protection of the power supply output switch. The IC includes: A bandgap reference trimmed to ±1% accuracy, an error amplifier, a current sense comparator with internal clamp to 1V, a high current totem pole output stage for fast switching of power MOSFET"s, and an externally programmable oscillator to set frequency and maximum duty cycle. The undervoltage lock-out is designed to operate with 250µA typ. start-up current, allowing an efficient bootstrap supply voltage design. KEY FEATURES ■ LOW START-UP CURRENT. (0.5mA max.) ■ TRIMMED OSCILLATOR DISCHARGE CURRENT. (See Product Highlight) ■ OPTIMIZED FOR OFF-LINE AND DC-TO-DC CONVERTERS. ■ AUTOMATIC FEED FORWARD COMPENSATION. ■ PULSE-BY-PULSE CURRENT LIMITING. ■ ENHANCED LOAD RESPONSE CHARACTERISTICS. ■ UNDER-VOLTAGE LOCKOUT WITH HYSTERESIS. ■ DOUBLE PULSE SUPPRESSION. ■ HIGH-CURRENT TOTEM POLE OUTPUT. ■ INTERNALLY TRIMMED BANDGAP REFERENCE. ■ 500KHz OPERATION. ■ LOW RO ERROR AMPLIFIER. APPLICATIONS ■ ECONOMICAL OFF-LINE FLYBACK OR FORWARD CONVERTERS. ■ DC-DC BUCK OR BOOST CONVERTERS. ■ LOW COST DC MOTOR CONTROL.

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