Overview
The UC2845AN is a current-mode PWM (Pulse Width Modulation) controller produced by Texas Instruments. It is part of the UCx84xA family, which is a pin-for-pin compatible improved version of the UCx84x family. This device is optimized for off-line and DC-DC converters, offering several enhanced features such as low start-up current, trimmed oscillator discharge current, and automatic feedforward compensation. The UC2845AN operates within a temperature range of 40°C to 85°C and is available in an 8-pin PDIP (P) package.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| VCC Voltage | 30 | V |
| Output Current | ±1 | A |
| Operating Temperature Range | 40 to 85 | °C |
| Maximum Duty Cycle | <50% | % |
| UVLO (Undervoltage Lockout) On/Off | 8.4V / 7.6V | V |
| Oscillator Frequency | Up to 500kHz | kHz |
| Package Type | PDIP (P) 8-pin | |
| Start-Up Current | <0.5mA | mA |
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
- 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 UC2845AN?
The UC2845AN operates within a temperature range of 40°C to 85°C.
- What is the maximum duty cycle of the UC2845AN?
The maximum duty cycle of the UC2845AN is less than 50%.
- What is the start-up current of the UC2845AN?
The start-up current of the UC2845AN is less than 0.5mA.
- What is the UVLO (Undervoltage Lockout) threshold for the UC2845AN?
The UVLO on and off thresholds for the UC2845AN are 8.4V and 7.6V, respectively.
- What is the maximum oscillator frequency of the UC2845AN?
The UC2845AN can operate up to 500kHz.
- What type of package is the UC2845AN available in?
The UC2845AN is available in an 8-pin PDIP (P) package.
- What are some key applications of the UC2845AN?
The UC2845AN is used in switch mode power supplies (SMPS), DC-DC converters, power modules, industrial power supplies, and battery-operated power supplies.
- Does the UC2845AN have automatic feedforward compensation?
Yes, the UC2845AN features automatic feedforward compensation.
- What is the output current capability of the UC2845AN?
The UC2845AN can source and sink up to 1 A of gate driver current.
- Does the UC2845AN have pulse-by-pulse current limiting?
Yes, the UC2845AN includes pulse-by-pulse current limiting.
