Overview
The UC3845ADWTRG4 is a single-ended current-mode PWM controller produced by Texas Instruments. This component is part of the UCx84x series, which is designed to implement off-line and DC-to-DC fixed-frequency current-mode control schemes with a minimal number of external components. The UC3845ADWTRG4 operates within a temperature range of 0°C to 70°C and is packaged in a 14-pin SOIC (D) package.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Operating Temperature Range | 0 to 70 | °C |
| Package Type | SOIC (D) | - |
| Number of Pins | 14 | - |
| Oscillator Frequency | 100 to 500 | kHz |
| Maximum Duty Cycle | 47% to 50% | % |
| UVLO Enable Threshold | 7.8 to 9 | V |
| UVLO Off Threshold | 7 to 8.2 | V |
| Start-up Current | < 1 | mA |
| Output Drive Current | ±1 | A |
| Reference Voltage | 4.9 to 5.1 | V |
Key Features
- Optimized for off-line and DC-to-DC converters
- Low start-up current (< 1mA)
- 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 500kHz operation
- Error amplifier with low output resistance
Applications
The UC3845ADWTRG4 is suitable for various power supply applications, including:
- Off-line power supplies
- DC-to-DC converters
- Switch-mode power supplies
- High-frequency switching applications
Q & A
- What is the operating temperature range of the UC3845ADWTRG4?
The UC3845ADWTRG4 operates within a temperature range of 0°C to 70°C.
- What is the package type and number of pins for the UC3845ADWTRG4?
The UC3845ADWTRG4 is packaged in a 14-pin SOIC (D) package.
- What is the oscillator frequency range of the UC3845ADWTRG4?
The oscillator frequency range is from 100 kHz to 500 kHz.
- What is the maximum duty cycle of the UC3845ADWTRG4?
The maximum duty cycle is between 47% and 50%.
- What are the UVLO enable and off thresholds for the UC3845ADWTRG4?
The UVLO enable threshold is between 7.8V and 9V, and the UVLO off threshold is between 7V and 8.2V.
- What is the start-up current of the UC3845ADWTRG4?
The start-up current is less than 1 mA.
- What is the output drive current capability of the UC3845ADWTRG4?
The output drive current is ±1 A.
- What is the reference voltage of the UC3845ADWTRG4?
The reference voltage is between 4.9V and 5.1V.
- What are some key features of the UC3845ADWTRG4?
Key features include low start-up current, automatic feedforward compensation, pulse-by-pulse current limiting, and an internally trimmed bandgap reference.
- In what types of applications is the UC3845ADWTRG4 commonly used?
The UC3845ADWTRG4 is commonly used in off-line power supplies, DC-to-DC converters, and other high-frequency switching applications.
