Overview
The UC3845ADTR is a high-performance current-mode PWM (Pulse Width Modulation) controller designed and manufactured by Texas Instruments. This device is part of the UCx84xA family, which is an improved version of the UCx84x family. It is optimized for use in off-line and DC-DC converter applications, offering a range of features that enhance its performance and reliability.
The UC3845ADTR is particularly suited for low-voltage applications, with undervoltage lockout (UVLO) thresholds of 8.4V (on) and 7.6V (off). It operates within a temperature range of 0°C to 70°C and is available in a 14-pin SOIC (Small Outline Integrated Circuit) package.
Key Specifications
| Parameter | Value |
|---|---|
| Package | 14-pin SOIC (D) |
| Operating Temperature Range | 0°C to 70°C |
| Supply Voltage (Vcc/Vdd) | 7.6 V to 30 V |
| Switching Frequency | Up to 500 kHz |
| Output Current | Up to 1 A |
| UVLO Thresholds | 8.4 V (on), 7.6 V (off) |
| Duty Cycle (Max) | 48% |
| Topology | Buck, Boost, Flyback, Forward Converter |
Key Features
- Current-mode operation up to 500 kHz switching frequency
- 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
- Output deadtime adjustable from 50% to 70%
- Pb-free packages available
Applications
The UC3845ADTR is designed for use in various power supply applications, including:
- Off-line converters
- DC-DC converters
- Buck, Boost, Flyback, and Forward converters
- Low-voltage power supplies
Q & A
- What is the UC3845ADTR used for?
The UC3845ADTR is a current-mode PWM controller used in off-line and DC-DC converter applications.
- What is the operating temperature range of the UC3845ADTR?
The operating temperature range is 0°C to 70°C.
- What are the UVLO thresholds for the UC3845ADTR?
The UVLO thresholds are 8.4 V (on) and 7.6 V (off).
- What is the maximum switching frequency of the UC3845ADTR?
The maximum switching frequency is up to 500 kHz.
- What is the maximum output current of the UC3845ADTR?
The maximum output current is up to 1 A.
- What package type is the UC3845ADTR available in?
The UC3845ADTR is available in a 14-pin SOIC (D) package.
- Does the UC3845ADTR have undervoltage lockout with hysteresis?
- Can the output deadtime be adjusted on the UC3845ADTR?
- Is the UC3845ADTR Pb-free?
- What are some common applications of the UC3845ADTR?
