Overview
The UC3843AD8TR is a current-mode PWM controller from Texas Instruments, designed to optimize performance in off-line and DC-DC converters. This device is part of the UCx84xA family, which is a pin-for-pin compatible improved version of the UCx84x family. It features a low start-up current of less than 0.5 mA, trimmed oscillator discharge current, and enhanced load response characteristics. The UC3843AD8TR operates within a temperature range of 0°C to 70°C and is packaged in an 8-pin SOIC (D) package.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package Type | SOIC (D) | - |
| Pins | 8 | - |
| Operating Temperature Range | 0 to 70 | °C |
| Switching Frequency | Up to 500 kHz | - |
| Output Voltage | 4.9 to 5.1 | V |
| UVLO Start Threshold | 7.8 to 8.4 V | V |
| UVLO Minimum Operation Voltage | 7.6 to 8.2 V | V |
| Maximum Duty Cycle | 94% | - |
| Output Current Capability | Up to 1 A | A |
Key Features
- 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
- Create a Custom Design Using the UCx84xA With the WEBENCH Power Designer
Applications
The UC3843AD8TR is suitable for a variety of power supply applications, including off-line and DC-DC converters. It can be used in both isolated and non-isolated power supply designs. Typical applications include:
- Off-line flyback converters
- Forward converters
- Half-bridge and full-bridge converters
- Isolated and non-isolated DC-DC converters
Q & A
- What is the operating temperature range of the UC3843AD8TR?
The operating temperature range is 0°C to 70°C.
- What is the maximum switching frequency of the UC3843AD8TR?
The maximum switching frequency is up to 500 kHz.
- What is the UVLO start threshold for the UC3843AD8TR?
The UVLO start threshold is between 7.8 V and 8.4 V.
- What is the maximum duty cycle of the UC3843AD8TR?
The maximum duty cycle is 94%.
- What is the output current capability of the UC3843AD8TR?
The output current capability is up to 1 A.
- What type of package does the UC3843AD8TR come in?
The UC3843AD8TR comes in an 8-pin SOIC (D) package.
- What are some typical applications for the UC3843AD8TR?
Typical applications include off-line flyback converters, forward converters, half-bridge and full-bridge converters, and isolated and non-isolated DC-DC converters.
- Does the UC3843AD8TR have any environmental certifications?
Yes, it is RoHS compliant and free of Sb/Br.
- How can I design a custom power supply using the UC3843AD8TR?
You can use the WEBENCH Power Designer to create a custom design using the UCx84xA family.
- What is the start-up current of the UC3843AD8TR?
The start-up current is less than 0.5 mA..
