UC3842AM
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Microchip Technology UC3842AM

Manufacturer No:
UC3842AM
Manufacturer:
Microchip Technology
Package:
Tube
Description:
IC REG CTRLR PWM CM 8-DIP
Delivery:
Payment:
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Product Introduction

Overview

The UC3842AM from Microchip Technology is a high-performance, fixed-frequency, current-mode PWM (Pulse Width Modulation) controller. This integrated circuit is specifically designed for off-line and DC-to-DC converter applications, requiring minimal external components. It features a trimmed oscillator for precise duty cycle control, a temperature-compensated reference, a high-gain error amplifier, and a current sensing comparator. The UC3842AM is part of the UC3842/UC3843/UC3844/UC3845 family, known for their robust and reliable performance in power management systems.

Key Specifications

Parameter Symbol Min. Typ. Max. Unit
Supply Voltage VCC - - 30 V
Output Current IO - - ±1 A
Analog Inputs (Pin 2, 3) V(ANA) -0.3 - 6.3 V
Error Amp Output Sink Current ISINK (E.A) - - 10 mA
Power Dissipation at TA≤25°C (8DIP) PD - - 1200 mW
Storage Temperature Range TSTG -65 - +150 °C
Reference Output Voltage VREF 4.90 5.00 5.10 V
Oscillation Frequency f 47 52 57 kHz
Maximum Duty Cycle D(Max) 95 97 100 %
Start-Up Current IST - - 0.45 mA
Operating Supply Current ICC(OPR) - - 17 mA

Key Features

  • Low Start-Up Current: The UC3842AM has a low start-up current, which is beneficial for power-saving applications.
  • Maximum Duty Clamp: It supports a maximum duty cycle of up to 100% for the UC3842 and UC3843 models.
  • UVLO With Hysteresis: The device features an under-voltage lockout (UVLO) with hysteresis, ensuring stable operation and preventing false starts.
  • Operating Frequency up to 500KHz: The oscillator can operate at frequencies up to 500 KHz, making it versatile for various applications.
  • Temperature Compensated Reference: A temperature-compensated reference voltage ensures stable operation over a wide temperature range.
  • High Gain Error Amplifier: The high-gain error amplifier provides precise control over the output voltage.
  • Current Sensing Comparator: The integrated current sensing comparator allows for accurate current monitoring and control.
  • High Current Totem-Pole Output: The output stage is capable of driving power MOSFETs directly.

Applications

The UC3842AM is designed for use in various power management applications, including:

  • Off-Line and DC-to-DC Converters: Suitable for both off-line and DC-to-DC converter designs, it is ideal for power supplies, adapters, and other power conversion systems.
  • Boost, Buck, Flyback, and Forward Regulators: It can be used in different topologies such as boost, buck, flyback, and forward regulators.
  • Isolation Capable Output: The device supports isolation capable output configurations, making it suitable for applications requiring electrical isolation.
  • Step-Up and Step-Down Regulators: It is versatile enough to be used in both step-up and step-down regulator designs.

Q & A

  1. What is the maximum supply voltage for the UC3842AM?

    The maximum supply voltage (VCC) for the UC3842AM is 30V.

  2. What is the typical oscillation frequency of the UC3842AM?

    The typical oscillation frequency is around 52 kHz.

  3. What is the maximum duty cycle for the UC3842AM?

    The maximum duty cycle for the UC3842AM is up to 100%.

  4. What is the start-up current for the UC3842AM?

    The start-up current (IST) is typically 0.45 mA.

  5. What are the UVLO thresholds for the UC3842AM?

    The UVLO thresholds for the UC3842AM are 16V (on) and 10V (off) for UC3842 and 8.5V (on) and 7.9V (off) for UC3843.

  6. What is the power dissipation at TA≤25°C for the 8DIP package?

    The power dissipation at TA≤25°C for the 8DIP package is 1200 mW.

  7. What is the reference output voltage for the UC3842AM?

    The reference output voltage (VREF) is typically 5.00 V.

  8. How does the UC3842AM handle under-voltage lockout?

    The device features an under-voltage lockout (UVLO) with hysteresis, which ensures stable operation and prevents false starts by biasing the output driver to a high impedance state during UVLO.

  9. What are the typical operating supply current and start-up current for the UC3842AM?

    The typical operating supply current (ICC(OPR)) is 14 mA, and the start-up current (IST) is typically 0.45 mA.

  10. What are some common applications of the UC3842AM?

    The UC3842AM is commonly used in off-line and DC-to-DC converters, boost, buck, flyback, and forward regulators, as well as in step-up and step-down regulator designs.

Product Attributes

Output Type:Transistor Driver
Function:Step-Up, Step-Down
Output Configuration:Positive, Isolation Capable
Topology:Boost, Buck, Flyback, Forward
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:Through Hole
Package / Case:8-DIP (0.300", 7.62mm)
Supplier Device Package:8-DIP
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Similar Products

Part Number UC3842AM UC3844AM UC3843AM UC3842AN UC3842AD UC3842ADM
Manufacturer Microchip Technology Microchip Technology Microchip Technology Texas Instruments Fairchild Semiconductor Microsemi Corporation
Product Status Discontinued at Digi-Key Discontinued at Digi-Key Discontinued at Digi-Key Active Obsolete Discontinued at Digi-Key
Output Type Transistor Driver Transistor Driver Transistor Driver Transistor Driver Transistor Driver Transistor Driver
Function Step-Up, Step-Down Step-Up, Step-Down Step-Up, Step-Down Step-Up, Step-Down, Step-Up/Step-Down Step-Up, Step-Down, Step-Up/Step-Down 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, Buck, Flyback, Forward Boost, Buck, Flyback, Forward Boost, Buck, Flyback, Forward Boost, Buck, Flyback, Forward Boost, Buck, Flyback, Forward Boost, Buck, Flyback, Forward
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 7.6V ~ 30V 10V ~ 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% 48% 96% 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 0°C ~ 70°C (TA) 0°C ~ 70°C (TA) 0°C ~ 70°C (TA) 0°C ~ 70°C (TA) 0°C ~ 70°C (TA) 0°C ~ 70°C (TA)
Mounting Type Through Hole Through Hole Through Hole Through Hole Surface Mount Surface Mount
Package / Case 8-DIP (0.300", 7.62mm) 8-DIP (0.300", 7.62mm) 8-DIP (0.300", 7.62mm) 8-DIP (0.300", 7.62mm) 14-SOIC (0.154", 3.90mm Width) 8-SOIC (0.154", 3.90mm Width)
Supplier Device Package 8-DIP 8-DIP 8-DIP 8-PDIP 14-SOIC 8-SOIC

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