Overview
The UC3843D8 is a single-ended 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 and DC-to-DC fixed-frequency current-mode control schemes with a minimum number of external components. This device is optimized for use in power supply applications, offering features such as low start-up current, automatic feedforward compensation, and high-current totem-pole output. The UC3843D8 operates within a temperature range of 0°C to 70°C and is available in an 8-pin SOIC (D) package.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package | SOIC (D) | - |
| Pins | 8 | - |
| Operating Temperature Range | 0 to 70 | °C |
| Supply Voltage | Up to 30 | V |
| Output Current | ±1 | A |
| Maximum Duty Cycle | 100% | - |
| Oscillation Frequency | Up to 500 kHz | - |
| Start-Up Current | < 1 mA | - |
| UVLO Thresholds | 8.4V (on), 7.6V (off) | V |
| Power Dissipation at TA≤25°C (8SOP) | 460 mW | - |
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 UC3843D8 is specifically designed for use in off-line and DC-to-DC converter applications. It is suitable for a variety of power supply designs, including switch-mode power supplies, DC-DC converters, and other high-efficiency power conversion systems. The device's features make it particularly useful in applications requiring precise current-mode control and high reliability.
Q & A
- What is the operating temperature range of the UC3843D8?
The UC3843D8 operates within a temperature range of 0°C to 70°C. - What is the maximum duty cycle of the UC3843D8?
The maximum duty cycle of the UC3843D8 is 100%. - What is the typical start-up current of the UC3843D8?
The start-up current of the UC3843D8 is less than 1 mA. - What are the UVLO thresholds for the UC3843D8?
The UVLO thresholds for the UC3843D8 are 8.4V (on) and 7.6V (off). - What is the maximum oscillation frequency of the UC3843D8?
The UC3843D8 can operate up to 500 kHz. - What type of output stage does the UC3843D8 have?
The UC3843D8 has a high-current totem-pole output stage designed for driving N-channel MOSFETs. - What is the power dissipation of the UC3843D8 in an 8SOP package at TA≤25°C?
The power dissipation of the UC3843D8 in an 8SOP package at TA≤25°C is 460 mW. - Is the UC3843D8 suitable for DC-DC converter applications?
Yes, the UC3843D8 is specifically designed for DC-DC converter applications. - What type of compensation does the UC3843D8 offer?
The UC3843D8 offers automatic feedforward compensation. - How many pins does the UC3843D8 have?
The UC3843D8 has 8 pins in a SOIC (D) package.
