Overview
The UC3845AD, produced by Texas Instruments, is a current-mode PWM (Pulse Width Modulation) controller designed for use in off-line and DC-DC converters. This device is part of the UCx84xA family, which offers improved features over its predecessors. It is optimized for controlling current-mode or switched-mode power supplies, making it a versatile component in power management systems.
Key Specifications
| Parameter | Value |
|---|---|
| Operating Voltage | 30V |
| Output Current | 1A |
| Switching Frequency | Up to 500kHz |
| Undervoltage Lockout (UVLO) | 8.4V/7.6V |
| Duty Cycle | 50% |
| Operating Temperature Range | 0°C to 70°C |
| Package Type | SOIC (D) - 14 pins |
Key Features
- Optimized for Off-Line and DC-DC Converters
- Low Start-Up Current (< 0.5mA)
- 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 500kHz Operation
Applications
The UC3845AD is suitable for a variety of power management applications, including:
- Off-Line Power Supplies
- DC-DC Converters
- Switched-Mode Power Supplies
- High-Frequency Power Conversion Systems
Q & A
- What is the operating voltage range of the UC3845AD?
The UC3845AD operates within a voltage range of up to 30V.
- What is the maximum switching frequency of the UC3845AD?
The UC3845AD can operate up to a switching frequency of 500kHz.
- What is the undervoltage lockout (UVLO) threshold for the UC3845AD?
The UVLO thresholds are 8.4V and 7.6V.
- What is the duty cycle of the UC3845AD?
The duty cycle is 50%.
- What is the operating temperature range of the UC3845AD?
The operating temperature range is from 0°C to 70°C.
- What package type is the UC3845AD available in?
The UC3845AD is available in a SOIC (D) package with 14 pins.
- What are some key features of the UC3845AD?
Key features include low start-up current, trimmed oscillator discharge current, automatic feedforward compensation, and high-current totem pole output.
- Is the UC3845AD suitable for high-frequency power conversion?
Yes, it is suitable for high-frequency power conversion systems.
- Does the UC3845AD have undervoltage lockout with hysteresis?
Yes, it includes undervoltage lockout with hysteresis.
- Can the UC3845AD be used in DC-DC converters?
Yes, it is optimized for use in DC-DC converters.
