Part Number: UC3844BD1013TR

Manufacturer: STMicroelectronics


Shipped from: Shenzhen/HK Warehouse

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Technical Specifications of UC3844BD1013TR

Datasheet  UC3844BD1013TR datasheet
Category Integrated Circuits (ICs)
Family PMIC – AC DC Converters, Offline Switchers
Manufacturer STMicroelectronics
Packaging Tape & Reel (TR)
Part Status Active
Output Isolation Isolated
Internal Switch(s) No
Voltage – Breakdown
Topology Forward
Voltage – Start Up 16V
Voltage – Supply (Vcc/Vdd) 10 V ~ 30 V
Duty Cycle 48%
Frequency – Switching Up to 500kHz
Power (Watts)
Fault Protection Current Limiting
Control Features Frequency Control
Operating Temperature -40°C ~ 150°C (TJ)
Package / Case 8-SOIC (0.154″, 3.90mm Width)
Supplier Device Package 8-SO
Mounting Type Surface Mount

UC3844BD1013TR Introduction

The UC3844BD1013TR is an integrated circuit for power management that finds widespread use in various applications. These applications include battery chargers, voltage regulators, and switch-mode power supply. This multifunctional device is designed to deliver great efficiency and reliable performance. It is a popular choice among designers and makers of electronic products because it offers both of these benefits.

In this piece, we will present a comprehensive overview to the UC3844BD1013TR, covering its characteristics, specifications, applications, and some helpful hints for creating with it.

UC3844BD1013TR Description

The UC384xB series of control ICs has all the functionality required to construct off-line or DC-to-DC constant frequency current mode control schemes using minimal external components. Using such control methods, one can govern the current flow throughout the system. The UC3844BD1013TR is made up of several parts, comprising an accurately trimmed precision reference at the error amp input, logic circuits that guarantee latched operation, a PWM comparator that enables current limit control, and a totem pole output stage that can source or sink high peak current while operating in voltage lockout mode. The UC3844BD1013TR also has a very low startup current of 0.5mA. These components are trimmed for a start-up current of less than the output stage’s low off-state voltage, making it ideal for driving N-channel MOSFETs.

The components of this family are distinct in several important areas, such as the maximum duty cycle ranges they support and the under-voltage lockout thresholds they adhere to. The UC3842B and UC3844B are suited for off-line use because to their UVLO thresholds, which are set at 16V (on) and 10V (off). On the other hand, the UC3843B and UC3845B have reduced working voltage needs of 8.5 V and 7.9 V, respectively. The UC3842B and the UC3843B can operate at over 100 percent duty cycles. The UC3844B and UC45B can generate a range from 0 to 50 percent since they have an integrated toggle flip flop. This flip-flop will turn off the output at specific points in the clock cycle that have been previously specified.

UC3844BD1013TR Features

  • Oscillator trimmed for exact frequency control
  • 250khz oscillator frequency is guaranteed.
  • Operation in the current mode at 500 khz.
  • Compensation for forward feed automatic.
  • Cycle-by-cycle current limiting using latching pwm.
  • Reference was internal trimmed with undervoltage lockout.
  • Very high totem pole output.
  • Hysteresis and undervoltage lockout
  • High operating current and low start-up.

Detailed features of UC3844BD1013TR

One of the most well-liked options for power electronics applications is the UC3844BD1013TR, which boasts several useful characteristics. The following is a list of some of the primary characteristics of this controller IC:

Error Amplifier The precision adjustment of the output voltage is made possible by the error amplifier found in the UC3844BD1013TR. The duty cycle of the PWM signal is adjusted based on the results of a comparison that this amplifier performs between the output voltage and a reference value.

The UC3844BD1013TR has a PWM comparator responsible for generating the PWM signal that controls the output voltage. This signal is responsible for regulating the output voltage. This signal is produced in response to the output of the error amplifier, and the signal’s duty cycle is modified to control the output voltage.

Oscillator: The oscillator of the UC3844BD1013TR is responsible for producing a consistent frequency that is then utilized to control the PWM signal. To tailor the oscillator’s frequency to the application’s specific needs, other components can be used to make frequency adjustments.

High-Current Output Driver The high-current output driver of the UC3844BD1013TR can generate up to 1A of current at its maximum capacity. Because of this, it is suited for use in contexts requiring high levels of power.

Soft-Start: The UC3844BD1013TR has a soft-start feature that restricts the current flow during the startup process. This eliminates the risk of excessive inrush currents, which have the potential to cause damage to the power supply’s components.

UC3844BD1013TR Applications

Power electronics applications come in a wide variety, and the UC3844BD1013TR is versatile enough to be employed in all of them. The following are some of the more frequent applications:

Voltage Regulators: The UC3844BD1013TR can be utilized in the process of regulating the voltage that is delivered by a power source. It is suitable for use in linear voltage regulators as well as switching voltage regulators.

DC-DC Converters: The UC3844BD1013TR is a component that can be utilized in DC-DC converters, which convert high and lower voltages. Chargers for portable electronic devices like laptops, cell phones, and other handheld gadgets typically incorporate this component.

Battery Chargers: You can use the UC3844BD1013TR to adjust the charging current and voltage in battery chargers by inserting it into one of those. It is suitable for use with lead-acid batteries as well as lithium-ion batteries.

The UC3844BD1013TR can also be utilized to convert direct current (DC) power to alternating current (AC) power in power inverters. This is a common component in solar and other renewable energy systems.


PWM controllers can be used in various power electronics applications, and the UC3844BD1013TR is a potent model that excels in both versatility and dependability in these contexts. Because of its programmable dead time, soft start, and current limiting characteristics, the controller is a well-liked option for engineers and designers who are attempting to optimize their circuits to achieve the highest possible levels of efficiency and performance, as detailed in this article. The information provided in this tutorial will assist you in getting the most out of the UC3844BD1013TR and elevate the caliber of your projects, regardless of whether you are a novice to the field of electronics or an experienced professional.

Why then stop there? Contact ICRFQ immediately for more information about the UC3844BD1013TR and other best electronic components. You can rely on our team of professionals to give you the direction and assistance you need to advance your concepts. To learn more about the UC3844BD1013TR and other electronic parts that can aid you in achieving your objectives, get in touch with us right away. Let ICRFQ be your dependable ally while you seek out cutting-edge, high-performance power electronics.

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