UC3844BDG
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onsemi UC3844BDG

Manufacturer No:
UC3844BDG
Manufacturer:
onsemi
Package:
Bulk
Description:
IC REG CTRLR PWM CM 14-SOIC
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Payment:
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Product Introduction

Overview

The UC3844BDG is a high-performance fixed frequency current mode PWM 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 an oscillator, a temperature-compensated reference, a high gain error amplifier, a current sensing comparator, and a high current totem pole output ideal for driving a power MOSFET.

The device includes protective features such as input and reference undervoltage lockouts with hysteresis, cycle-by-cycle current limiting, and a latch for single pulse metering. It also allows output deadtimes to be programmed from 50% to 70% using a flip-flop that blanks the output off every other oscillator cycle.

Key Specifications

Parameter Value Unit
Supply Voltage (VCC) 30 V
Oscillator Frequency 250 kHz kHz
Output Switching Frequency Up to 500 kHz kHz
Output Deadtime Adjustable 50% to 70% %
UVLO Thresholds (On/Off) 16 V / 10 V V
Output Current ±1 A A
Package Type SOIC-14
Power Dissipation at TA≤25°C (SOIC-14) 680 mW mW
Storage Temperature Range -65 to +150 °C °C

Key Features

  • Trimmed Oscillator for Precise Frequency Control
  • Oscillator Frequency Guaranteed at 250 kHz
  • Current Mode Operation to 500 kHz Output Switching Frequency
  • Output Deadtime Adjustable from 50% to 70%
  • 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 are Available

Applications

The UC3844BDG is designed for off-line and DC-DC converter applications. It is particularly suitable for:

  • Off-line converters due to its UVLO thresholds of 16 V (on) and 10 V (off)
  • Boost, flyback, and other DC-DC converter topologies
  • Power supply systems requiring high efficiency and reliability
  • Automotive and industrial power management systems

Q & A

  1. What is the primary function of the UC3844BDG?

    The UC3844BDG is a high-performance fixed frequency current mode PWM controller designed for off-line and DC-DC converter applications.

  2. What are the UVLO thresholds for the UC3844BDG?

    The UVLO thresholds for the UC3844BDG are 16 V (on) and 10 V (off).

  3. What is the maximum output switching frequency of the UC3844BDG?

    The maximum output switching frequency is up to 500 kHz.

  4. What types of packages are available for the UC3844BDG?

    The UC3844BDG is available in 8-pin dual-in-line (DIP), 8-pin surface mount (SOIC-8), and 14-pin surface mount (SOIC-14) packages.

  5. Does the UC3844BDG have protective features?
  6. What is the typical oscillator frequency of the UC3844BDG?

    The oscillator frequency is guaranteed at 250 kHz.

  7. Can the output deadtime be adjusted on the UC3844BDG?
  8. Is the UC3844BDG Pb-free and RoHS compliant?
  9. What is the maximum supply voltage for the UC3844BDG?

    The maximum supply voltage is 30 V.

  10. What is the storage temperature range for the UC3844BDG?

    The storage temperature range is -65 to +150 °C.

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 ~ 36V
Frequency - Switching:Up to 500kHz
Duty Cycle (Max):48%
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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Similar Products

Part Number UC3844BDG UC3844BNG UC3845BDG UC3844BVDG UC3842BDG UC3843BDG UC3844BD UC3844BD1 UC3844BD1G
Manufacturer onsemi onsemi onsemi onsemi onsemi onsemi onsemi STMicroelectronics onsemi
Product Status Obsolete Active Obsolete Obsolete Obsolete Obsolete Obsolete Active Active
Output Type Transistor Driver Transistor Driver 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 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 Positive, Isolation Capable Positive, Isolation Capable
Topology Boost, Flyback Boost, Flyback Boost, Flyback Boost, Flyback Boost, Flyback Boost, Flyback Boost, Flyback Boost, Flyback Boost, Flyback
Number of Outputs 1 1 1 1 1 1 1 1 1
Output Phases 1 1 1 1 1 1 1 1 1
Voltage - Supply (Vcc/Vdd) 10V ~ 36V 10V ~ 36V 7.6V ~ 30V 10V ~ 36V 10V ~ 30V 7.6V ~ 30V 10V ~ 36V 10V ~ 30V 10V ~ 36V
Frequency - Switching Up to 500kHz Up to 500kHz Up to 500kHz Up to 500kHz Up to 500kHz Up to 500kHz Up to 500kHz Up to 500kHz Up to 500kHz
Duty Cycle (Max) 48% 48% 48% 48% 96% 96% 48% 48% 48%
Synchronous Rectifier No No No No No No No No No
Clock Sync No No 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 Frequency Control Frequency Control
Operating Temperature 0°C ~ 70°C (TA) 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 (TJ) 0°C ~ 70°C (TA)
Mounting Type Surface Mount Through Hole Surface Mount Surface Mount Surface Mount Surface Mount Surface Mount Surface Mount Surface Mount
Package / Case 14-SOIC (0.154", 3.90mm Width) 8-DIP (0.300", 7.62mm) 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) 14-SOIC (0.154", 3.90mm Width) 8-SOIC (0.154", 3.90mm Width) 8-SOIC (0.154", 3.90mm Width)
Supplier Device Package 14-SOIC 8-PDIP 14-SOIC 14-SOIC 14-SOIC 14-SOIC 14-SOIC 8-SOIC 8-SOIC

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