Overview
The UC2843D8 is a current-mode PWM (Pulse Width Modulation) controller produced by Texas Instruments. It is part of the UCx84x series of control integrated circuits, designed to implement off-line or DC-to-DC fixed-frequency current-mode control schemes with a minimal number of external components. This device is optimized for use in off-line and DC-to-DC converters, offering high efficiency and a wide range of operating voltages.
Key Specifications
| Parameter | Value |
|---|---|
| Package | 8-SOIC (D) |
| Pins | 8 |
| Operating Temperature Range (°C) | -40 to 85 |
| Supply Voltage (V) | 7.6 V to 30 V |
| Switching Frequency | Up to 500 kHz |
| Maximum Duty Cycle | 100% (97% typical) |
| Output Current | 1 A |
| Undervoltage Lockout (UVLO) | 8.4 V / 7.6 V with hysteresis |
| Start-up Current | < 1 mA |
Key Features
- Optimized for off-line and DC-to-DC converters
- Low start-up current (< 1 mA)
- 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
- Error amplifier with low output resistance
Applications
The UC2843D8 is suitable for a variety of power supply applications, including off-line and DC-to-DC converters. It is particularly useful in boost, flyback, and forward converter topologies. The device's high efficiency, wide operating voltage range, and robust control features make it an ideal choice for designing power supplies in various industries such as consumer electronics, industrial power systems, and telecommunications.
Q & A
- What is the operating temperature range of the UC2843D8?
The UC2843D8 operates over a temperature range of -40°C to 85°C. - What is the maximum switching frequency of the UC2843D8?
The maximum switching frequency is up to 500 kHz. - What is the typical duty cycle of the UC2843D8?
The typical duty cycle is 97%, with a maximum of 100%. - What is the undervoltage lockout (UVLO) threshold of the UC2843D8?
The UVLO thresholds are 8.4 V and 7.6 V with hysteresis. - What is the start-up current of the UC2843D8?
The start-up current is less than 1 mA. - What are the supported topologies for the UC2843D8?
The device supports boost, flyback, and forward converter topologies. - What is the output current capability of the UC2843D8?
The output current capability is up to 1 A. - Does the UC2843D8 have pulse-by-pulse current limiting?
Yes, it does have pulse-by-pulse current limiting. - Is the UC2843D8 RoHS compliant?
Yes, the UC2843D8 is RoHS compliant. - What package type is the UC2843D8 available in?
The UC2843D8 is available in an 8-pin SOIC (D) package.
