UC3842BDR2
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onsemi UC3842BDR2

Manufacturer No:
UC3842BDR2
Manufacturer:
onsemi
Package:
Tape & Reel (TR)
Description:
IC REG CTRLR PWM CM 14-SOIC
Delivery:
Payment:
iso14001
iso45001
iso9001
iso13485

Product Introduction

Overview

The UC3842BDR2 is a high-performance fixed frequency current mode controller produced by onsemi. It is specifically designed for off-line and DC-DC converter applications, offering a cost-effective solution with minimal external components. This integrated circuit features a trimmed oscillator for precise duty cycle control, a temperature-compensated reference, a high-gain error amplifier, a current sensing comparator, and a high-current totem pole output suitable for driving a power MOSFET.

Key Specifications

Characteristic Symbol Min Typ Max Unit
Bias and Driver Voltages VCC, VC - - 30 V
Total Power Supply and Zener Current ICC + IZ - - 30 mA
Output Current, Source or Sink IO - - 1.0 A
Output Energy (Capacitive Load per Cycle) W - - 5.0 μJ
Reference Output Voltage (IO = 1.0 mA, TJ = 25°C) Vref 4.95 5.0 5.05 V
Line Regulation (VCC = 12 V to 25 V) Regline - - 2.0 mV
Load Regulation (IO = 1.0 mA to 20 mA) Regload - - 3.0 mV
Temperature Stability TS - - 0.2 mV/°C
Output Voltage Low State (ISink = 20 mA) VOL - - 1.1 V
Output Voltage High State (ISource = 20 mA) VOH - - 6.2 V

Key Features

  • Trimmed oscillator for precise duty cycle control
  • Temperature-compensated reference
  • High-gain error amplifier
  • Current sensing comparator
  • High-current totem pole output for driving power MOSFETs
  • Protective features including input and reference undervoltage lockouts with hysteresis, cycle-by-cycle current limiting, programmable output deadtime, and a latch for single pulse metering
  • Available in 8-pin dual-in-line and surface mount (SOIC-8) packages, as well as 14-pin surface mount (SOIC-14) package with separate power and ground connections

Applications

  • Off-line converters
  • DC-DC converters
  • Power supply systems requiring high efficiency and reliability
  • Switch-mode power supplies
  • High-performance power management systems

Q & A

  1. What is the primary function of the UC3842BDR2?

    The UC3842BDR2 is a high-performance fixed frequency current mode controller designed for off-line and DC-DC converter applications.

  2. What are the key protective features of the UC3842BDR2?

    The device includes input and reference undervoltage lockouts with hysteresis, cycle-by-cycle current limiting, programmable output deadtime, and a latch for single pulse metering.

  3. What is the maximum output current of the UC3842BDR2?

    The maximum output current is 1.0 A.

  4. What is the reference output voltage of the UC3842BDR2?

    The reference output voltage is typically 5.0 V, with a range of 4.95 V to 5.05 V.

  5. What are the available package options for the UC3842BDR2?

    The device is available in 8-pin dual-in-line and surface mount (SOIC-8) packages, as well as a 14-pin surface mount (SOIC-14) package.

  6. What is the purpose of the trimmed oscillator in the UC3842BDR2?

    The trimmed oscillator provides precise duty cycle control.

  7. How is the oscillator frequency programmed in the UC3842BDR2?

    The oscillator frequency is programmed by the values chosen for the timing components RT and CT.

  8. What is the maximum power dissipation of the UC3842BDR2 at TA = 25°C?

    The maximum power dissipation varies by package, but for the SOIC-14 package, it is specified in the datasheet.

  9. What is the temperature stability of the reference output voltage?

    The temperature stability is typically 0.2 mV/°C.

  10. Can the UC3842BDR2 be used in high-temperature environments?

    Yes, the device operates over a temperature range that includes up to +105°C for some versions.

Product Attributes

Output Type:Transistor Driver
Function:Step-Up, Step-Up/Step-Down
Output Configuration:Positive, Isolation Capable
Topology:Boost, Flyback
Number of Outputs:1
Output Phases:1
Voltage - Supply (Vcc/Vdd):10V ~ 30V
Frequency - Switching:Up to 500kHz
Duty Cycle (Max):96%
Synchronous Rectifier:No
Clock Sync:No
Serial Interfaces:- 
Control Features:Frequency Control
Operating Temperature:0°C ~ 70°C (TA)
Mounting Type:Surface Mount
Package / Case:14-SOIC (0.154", 3.90mm Width)
Supplier Device Package:14-SOIC
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$0.24
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Similar Products

Part Number UC3842BDR2 UC3842BDR2G UC3842BVDR2 UC3843BDR2 UC3844BDR2 UC3842ADR2 UC3842BD1R2
Manufacturer onsemi onsemi onsemi onsemi onsemi onsemi onsemi
Product Status Obsolete Active Obsolete Obsolete Obsolete Obsolete Obsolete
Output Type Transistor Driver Transistor Driver Transistor Driver Transistor Driver Transistor Driver Transistor Driver Transistor Driver
Function Step-Up, Step-Up/Step-Down Step-Up, Step-Up/Step-Down Step-Up, Step-Up/Step-Down Step-Up, Step-Up/Step-Down Step-Up, Step-Up/Step-Down Step-Up, Step-Up/Step-Down Step-Up, Step-Up/Step-Down
Output Configuration Positive, Isolation Capable Positive, Isolation Capable Positive, Isolation Capable Positive, Isolation Capable Positive, Isolation Capable Positive, Isolation Capable Positive, Isolation Capable
Topology Boost, Flyback Boost, Flyback Boost, Flyback Boost, Flyback Boost, Flyback Boost, Flyback Boost, Flyback
Number of Outputs 1 1 1 1 1 1 1
Output Phases 1 1 1 1 1 1 1
Voltage - Supply (Vcc/Vdd) 10V ~ 30V 10V ~ 30V 10V ~ 30V 7.6V ~ 30V 10V ~ 36V 10V ~ 30V 10V ~ 30V
Frequency - Switching Up to 500kHz Up to 500kHz Up to 500kHz Up to 500kHz Up to 500kHz Up to 500kHz Up to 500kHz
Duty Cycle (Max) 96% 96% 96% 96% 48% 96% 96%
Synchronous Rectifier No No No No No No No
Clock Sync No No No No No No No
Serial Interfaces - - - - - - -
Control Features Frequency Control Frequency Control Frequency Control Frequency Control Frequency Control Frequency Control Frequency Control
Operating Temperature 0°C ~ 70°C (TA) 0°C ~ 70°C (TA) -40°C ~ 105°C (TA) 0°C ~ 70°C (TA) 0°C ~ 70°C (TA) 0°C ~ 70°C (TA) 0°C ~ 70°C (TA)
Mounting Type Surface Mount Surface Mount Surface Mount Surface Mount Surface Mount Surface Mount Surface Mount
Package / Case 14-SOIC (0.154", 3.90mm Width) 14-SOIC (0.154", 3.90mm Width) 14-SOIC (0.154", 3.90mm Width) 14-SOIC (0.154", 3.90mm Width) 8-SOIC (0.154", 3.90mm Width) 14-SOIC (0.154", 3.90mm Width) 8-SOIC (0.154", 3.90mm Width)
Supplier Device Package 14-SOIC 14-SOIC 14-SOIC 14-SOIC 8-SOIC 14-SOIC 8-SOIC

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