UC3844BVDR2G
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onsemi UC3844BVDR2G

Manufacturer No:
UC3844BVDR2G
Manufacturer:
onsemi
Package:
Tape & Reel (TR)
Description:
IC REG CTRLR PWM CM 14-SOIC
Delivery:
Payment:
iso14001
iso45001
iso9001
iso13485

Product Introduction

Overview

The UC3844BVDR2G is a high-performance fixed frequency current mode controller produced by onsemi. This integrated circuit is specifically designed for off-line and DC-DC converter applications, offering a cost-effective solution with minimal external components. It features an oscillator, a temperature-compensated reference, a high-gain error amplifier, a current sensing comparator, and a high-current totem pole output suitable for driving power MOSFETs. The device includes protective features such as input and reference undervoltage lockouts with hysteresis, cycle-by-cycle current limiting, and adjustable output deadtimes.

Key Specifications

CharacteristicSymbolMinTypMaxUnit
Reference Output VoltageVref4.955.05.05V
Oscillator FrequencyfOSC-250 kHz-kHz
Oscillator Voltage Swing (Peak-to-Peak)VOSC-1.6-V
Output Voltage High StateVOH-5.06.2V
Output Voltage Low StateVOL0.8-1.1V
Output Current - SinkISink-1.0 A-A
Output Current - SourceISource-1.0 A-A
Undervoltage Lockout (VCC)-16 V (on), 10 V (off)--V
Operating Temperature Range--40°C to +105°C--°C

Key Features

  • Trimmed Oscillator for Precise Frequency Control
  • Current Mode Operation up to 500 kHz Output Switching Frequency
  • Adjustable Output Deadtime 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 and RoHS Compliant

Applications

The UC3844BVDR2G is suitable for various power conversion applications, including off-line and DC-DC converters. It is particularly useful in designs requiring high efficiency, reliability, and minimal external components. Common applications include power supplies, switch-mode power converters, and other high-performance power management systems.

Q & A

  1. What is the primary function of the UC3844BVDR2G? The UC3844BVDR2G is a high-performance fixed frequency current mode controller designed for off-line and DC-DC converter applications.
  2. What is the typical oscillator frequency of the UC3844BVDR2G? The oscillator frequency is typically 250 kHz.
  3. What are the undervoltage lockout thresholds for the UC3844BVDR2G? The VCC comparator thresholds are 16 V (on) and 10 V (off), and the Vref comparator thresholds are 3.6 V (on) and 3.4 V (off).
  4. What is the output current capability of the UC3844BVDR2G? The output can source and sink up to 1.0 A.
  5. Is the UC3844BVDR2G Pb-Free and RoHS Compliant? Yes, the UC3844BVDR2G is Pb-Free and RoHS Compliant.
  6. What are the common applications of the UC3844BVDR2G? Common applications include off-line and DC-DC converters, power supplies, and other high-performance power management systems.
  7. How is the output deadtime adjustable in the UC3844BVDR2G? The output deadtime is adjustable from 50% to 70% using the timing components RT and CT.
  8. What is the operating temperature range of the UC3844BVDR2G? The operating temperature range is -40°C to +105°C.
  9. Does the UC3844BVDR2G have built-in protective features? Yes, it includes protective features such as input and reference undervoltage lockouts with hysteresis and cycle-by-cycle current limiting.
  10. Can the UC3844BVDR2G be synchronized with an external clock signal? Yes, it can be frequency-locked to an external system clock by applying a clock signal to the oscillator circuit.

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:-40°C ~ 105°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 UC3844BVDR2G UC3845BVDR2G UC3842BVDR2G UC3843BVDR2G UC3844BDR2G UC3844BVD1R2G UC3844BVDR2
Manufacturer onsemi onsemi onsemi onsemi onsemi onsemi onsemi
Product Status Active Active Last Time Buy Active Active Active 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 ~ 36V 7.6V ~ 30V 10V ~ 30V 7.6V ~ 30V 10V ~ 36V 10V ~ 36V 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
Duty Cycle (Max) 48% 48% 96% 96% 48% 48% 48%
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 -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) -40°C ~ 105°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) 14-SOIC (0.154", 3.90mm Width) 8-SOIC (0.154", 3.90mm Width) 14-SOIC (0.154", 3.90mm Width)
Supplier Device Package 14-SOIC 14-SOIC 14-SOIC 14-SOIC 14-SOIC 8-SOIC 14-SOIC

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