Overview
The UC2843D is a high-performance current-mode PWM controller produced by Texas Instruments. It is part of the UCx84x series, which is designed for implementing off-line and DC-to-DC fixed-frequency current-mode control schemes with a minimal number of external components. This device is optimized for various power conversion applications, including switching regulators and transformer-coupled DC-DC converters.
Key Specifications
| Parameter | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| VCC Voltage | VCC | - | - | 30 | V |
| Output Current (Source or Sink) | IO | - | - | 1.0 | A |
| Output Energy (Capacitive Load per Cycle) | - | - | - | 5.0 | µJ |
| Operating Junction Temperature | TJ | -40 | - | 85 | °C |
| Storage Temperature Range | Tstg | -65 | - | 150 | °C |
| Reference Output Voltage (IO = 1.0 mA, TJ = 25°C) | Vref | 4.95 | 5.0 | 5.05 | V |
| Oscillator Frequency (TJ = 25°C) | fOSC | 49 | 52 | 57 | kHz |
| Error Amplifier Output Sink Current | IO | - | - | 10 | 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
- Up to 500-kHz operation
- Error amplifier with low output resistance
Applications
- Switching regulators of any polarity
- Transformer-coupled DC-DC converters
Q & A
- What is the operating temperature range for the UC2843D?
The UC2843D operates from –40°C to 85°C.
- What is the maximum output current of the UC2843D?
The maximum output current is 1.0 A.
- What is the reference output voltage of the UC2843D?
The reference output voltage is 4.95 V to 5.05 V at IO = 1.0 mA and TJ = 25°C.
- What is the oscillator frequency range of the UC2843D?
The oscillator frequency range is 49 kHz to 57 kHz at TJ = 25°C.
- Does the UC2843D have undervoltage lockout (UVLO) protection?
- What is the maximum power dissipation of the UC2843D at 25°C?
The maximum power dissipation varies by package, but for the SOIC-14 case, it is specified in the thermal characteristics section.
- Is the UC2843D ESD protected?
- What are the key applications of the UC2843D?
The UC2843D is used in switching regulators of any polarity and transformer-coupled DC-DC converters.
- What is the error amplifier output sink current of the UC2843D?
The error amplifier output sink current is up to 10 mA).
- Does the UC2843D have a high-current totem-pole output?
