UC3842BVD1R2G
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onsemi UC3842BVD1R2G

Manufacturer No:
UC3842BVD1R2G
Manufacturer:
onsemi
Package:
Tape & Reel (TR)
Description:
IC REG CTRLR BST FLYBK ISO 8SOIC
Delivery:
Payment:
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Product Introduction

Overview

The UC3842BVD1R2G 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. The device includes protective features such as input and reference undervoltage lockouts with hysteresis, cycle-by-cycle current limiting, programmable output deadtime, and a latch for single pulse metering.

Key Specifications

Parameter 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) - - 5.0 μJ
Reference Output Voltage (Vref) 4.95 5.0 5.05 V
Line Regulation (VCC = 12 V to 25 V) -2.0 - 20 mV
Load Regulation (IO = 1.0 mA to 20 mA) -3.0 - 25 mV
Temperature Stability -0.2 - - mV/°C
Oscillator Frequency - - 250 kHz
UVLO Startup Threshold 16 - - V
UVLO Turn-Off Threshold 10 - - V

Key Features

  • Trimmed Oscillator for Precise Frequency Control
  • Oscillator Frequency Guaranteed at 250 kHz
  • Current Mode Operation up to 500 kHz
  • Automatic Feed Forward Compensation
  • Latching PWM for Cycle-By-Cycle Current Limiting
  • Internally Trimmed Reference with Undervoltage Lockout
  • High Current Totem Pole Output
  • Undervoltage Lockout with Hysteresis
  • Low Startup and Operating Current
  • Pb-Free Packages Available

Applications

The UC3842BVD1R2G is designed for off-line and DC-DC converter applications. It is particularly suitable for:

  • Off-line power supplies
  • DC-DC converters, including flyback, forward, and boost converters
  • High-performance power management systems requiring precise control and protection features

Q & A

  1. What is the primary function of the UC3842BVD1R2G?

    The UC3842BVD1R2G 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 UC3842BVD1R2G?

    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 typical oscillator frequency of the UC3842BVD1R2G?

    The oscillator frequency is guaranteed at 250 kHz.

  4. What is the maximum output current of the UC3842BVD1R2G?

    The maximum output current is 1.0 A.

  5. What are the UVLO thresholds for the UC3842BVD1R2G?

    The UVLO startup threshold is 16 V, and the turn-off threshold is 10 V.

  6. What types of packages are available for the UC3842BVD1R2G?

    The device is available in 8-pin dual-in-line, SO-8, and 14-pin SO-14 packages.

  7. What is the purpose of the trimmed oscillator in the UC3842BVD1R2G?

    The trimmed oscillator provides precise duty cycle control and is temperature-compensated to minimize frequency variations.

  8. How does the current sensing comparator work in the UC3842BVD1R2G?

    The current sensing comparator monitors the inductor current and compares it to a level derived from the error amplifier output, controlling the peak inductor current on a cycle-by-cycle basis.

  9. What is the significance of the high current totem pole output in the UC3842BVD1R2G?

    The high current totem pole output is ideally suited for driving a power MOSFET, ensuring efficient and reliable operation.

  10. Is the UC3842BVD1R2G available in Pb-free packages?

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:-40°C ~ 105°C (TA)
Mounting Type:Surface Mount
Package / Case:8-SOIC (0.154", 3.90mm Width)
Supplier Device Package:8-SOIC
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Similar Products

Part Number UC3842BVD1R2G UC3842BVDR2G UC3844BVD1R2G UC3843BVD1R2G UC3842BD1R2G UC3842BVD1R2
Manufacturer onsemi onsemi onsemi onsemi onsemi onsemi
Product Status Active Last Time Buy Active Active Active Obsolete
Output Type 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
Output Configuration 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
Number of Outputs 1 1 1 1 1 1
Output Phases 1 1 1 1 1 1
Voltage - Supply (Vcc/Vdd) 10V ~ 30V 10V ~ 30V 10V ~ 36V 7.6V ~ 30V 10V ~ 30V 10V ~ 30V
Frequency - Switching Up to 500kHz Up to 500kHz Up to 500kHz Up to 500kHz Up to 500kHz Up to 500kHz
Duty Cycle (Max) 96% 96% 48% 96% 96% 96%
Synchronous Rectifier No No No No No No
Clock Sync No No No No No No
Serial Interfaces - - - - - -
Control Features Frequency Control Frequency Control Frequency Control Frequency Control Frequency Control Frequency Control
Operating Temperature -40°C ~ 105°C (TA) -40°C ~ 105°C (TA) -40°C ~ 105°C (TA) -40°C ~ 105°C (TA) 0°C ~ 70°C (TA) -40°C ~ 105°C (TA)
Mounting Type Surface Mount Surface Mount Surface Mount Surface Mount Surface Mount Surface Mount
Package / Case 8-SOIC (0.154", 3.90mm Width) 14-SOIC (0.154", 3.90mm Width) 8-SOIC (0.154", 3.90mm Width) 8-SOIC (0.154", 3.90mm Width) 8-SOIC (0.154", 3.90mm Width) 8-SOIC (0.154", 3.90mm Width)
Supplier Device Package 8-SOIC 14-SOIC 8-SOIC 8-SOIC 8-SOIC 8-SOIC

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