Overview
The UC3845AD8 from Texas Instruments is a current-mode PWM controller optimized for 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, making it suitable for applications where power efficiency is crucial. The UC3845AD8 is available in an 8-pin SOIC (D) package and operates within a temperature range of 0°C to 70°C.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package | SOIC (D) | - |
| Pins | 8 | - |
| Operating Temperature Range | 0 to 70 | °C |
| Maximum Duty Cycle | < 50% | - |
| UVLO (Undervoltage Lockout) | 8.4 V / 7.6 V | V |
| Oscillator Frequency | Up to 500 kHz | Hz |
| Output Current | High-Current Totem Pole Output | - |
| Bandgap Reference | Internally-Trimmed | - |
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
- Switch Mode Power Supplies (SMPS)
- DC-DC Converters
- Power Modules
- Industrial Power Supplies (PSU)
- Battery Operated Power Supplies (PSU)
Q & A
- What is the operating temperature range of the UC3845AD8?
The UC3845AD8 operates within a temperature range of 0°C to 70°C.
- What is the maximum duty cycle of the UC3845AD8?
The maximum duty cycle of the UC3845AD8 is less than 50%.
- What are the UVLO thresholds for the UC3845AD8?
The UVLO thresholds for the UC3845AD8 are 8.4 V and 7.6 V.
- What is the oscillator frequency range of the UC3845AD8?
The oscillator frequency range of the UC3845AD8 is up to 500 kHz.
- What is the start-up current of the UC3845AD8?
The start-up current of the UC3845AD8 is less than 0.5 mA.
- Does the UC3845AD8 have an internally-trimmed bandgap reference?
Yes, the UC3845AD8 has an internally-trimmed bandgap reference.
- What are some common applications of the UC3845AD8?
Common applications include switch mode power supplies (SMPS), DC-DC converters, power modules, industrial power supplies, and battery-operated power supplies.
- What package type is the UC3845AD8 available in?
The UC3845AD8 is available in an 8-pin SOIC (D) package.
- Does the UC3845AD8 support pulse-by-pulse current limiting?
Yes, the UC3845AD8 supports pulse-by-pulse current limiting.
- Can the UC3845AD8 be used with the WEBENCH Power Designer?
Yes, the UC3845AD8 can be used to create custom designs with the WEBENCH Power Designer.
