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UC3844AN +BOM

30-V, 1A, 500KHz current mode PWM controller with 16V/10V UVLO 50% duty cycle, 0°C to 70°C

UC3844AN Information

Description

The UC3844AN is a PWM controller IC from Texas Instruments, designed for use in power supply circuits such as offline and DC-DC converters, battery chargers, and LED drivers. It features optimized performance for these applications, including low start-up current, trimmed oscillator discharge current, automatic feedforward compensation, and pulse-by-pulse current limiting. The device also offers enhanced load response characteristics, undervoltage lockout with hysteresis, double pulse suppression, and a high-current totem pole output. With its internally-trimmed bandgap reference and ability to operate up to 500 kHz, the UC3844AN is suitable for various power management applications in industrial, automotive, and consumer electronics.

Features

The UC3844AN features include:

  • Optimized for Off-Line and DC-DC Converters
  • Low Start-Up Current (< 0.5 mA)
  • Trimmed Oscillator Discharge Current
  • Automatic Feedforward Compensation
  • Pulse-by-Pulse Current Limiting
  • Enhanced Load Response Characteristics
  • Undervoltage Lockout With Hysteresis
  • Double Pulse Suppression
  • High-Current Totem Pole Output
  • Internally-Trimmed Bandgap Reference
  • Up to 500-kHz Operation

These features make it suitable for various power supply applications, including offline and DC-DC converters, battery chargers, and LED drivers.

Package

The package type of UC3844AN is DIP8 (Dual In-Line Package, 8 pins).

Pinout

The UC3844AN has a DIP8 package with the following pins: 1. VCC: Positive supply voltage 2. GND: Ground 3. OUT: Output pin for the PWM signal 4. COMP: Compensation pin for the error amplifier 5. FB: Feedback input pin for the error amplifier 6. TRIM: Trim pin for the oscillator discharge current 7. DIS: Discharge pin for the oscillator 8. NC: No connect (not connected) The UC3844AN is a PWM controller IC designed to regulate voltage and current in power supply circuits. It has an internally trimmed bandgap reference, automatic feedforward compensation, and pulse-by-pulse current limiting, making it suitable for various power management applications.

Manufacturer

The manufacturer of the UC3844AN is Texas Instruments (TI), a leading American technology company that designs, manufactures, and sells semiconductors and other electronic components. TI is a global leader in the development and manufacturing of analog and embedded processing technologies. The company was founded in 1930 and is headquartered in Dallas, Texas.

Applications

According to the product description, the application areas of UC3844AN include:

  • Offline and DC-DC converters
  • Battery chargers
  • LED drivers

Additionally, its versatile design makes it suitable for various power supply needs in industrial, automotive, and consumer electronics.

Equivalent

Based on the features and applications of UC3844A, some equivalent products could be:

  • STP16CVA5 from STMicroelectronics
  • LT1070 from Linear Technology (now part of Analog Devices)
  • UCC3804 from Texas Instruments (same manufacturer as the original product)

These ICs are also PWM controllers, optimized for off-line and DC-DC converters, with similar features like low start-up current, oscillator discharge current, and undervoltage lockout.

Specifications

Category Integrated Circuits (ICs)Power Management (PMIC)DC DC Switching Controllers Output Type Transistor Driver
Function Step-Up, Step-Down, 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) 48%
Synchronous Rectifier No Clock Sync No
Serial Interfaces - Control Features Frequency Control
Operating Temperature 0°C ~ 70°C (TA) Mounting Type Through Hole
Base Product Number UC3844 Package/Case DIP8

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Ratings and Reviews

More
E
E**n 01/01/2023

Everyone in their bags. There are no rosin nozzles.

15
L
L**y 11/18/2022

The goods came after 6 days. Delivery is very long. The product corresponds to the description.

8
M
M**n 11/19/2021

Great value for resistors. Especially for when you don't need high power.

1
N
N**j 11/09/2021

Sent and delivered quickly. The board as in the photo, the description corresponds.

19

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In Stock: 4,789

Minimum Order: 1

Qty. Unit Price Ext. Price
1000+ $0.555 $555.00
500+ $0.573 $286.50
100+ $0.617 $61.70
30+ $0.803 $24.09
10+ $0.890 $8.90
1+ $1.047 $1.05

The prices above are for reference only.

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