Overview
The UC3844DTR is a current-mode PWM controller integrated circuit produced by Texas Instruments. It is part of the UCx84x family, which is optimized for off-line and DC-to-DC converters. This IC provides the necessary features to implement fixed-frequency current-mode control schemes with a minimal number of external components. Key features include low start-up current, automatic feedforward compensation, pulse-by-pulse current limiting, and enhanced load-response characteristics.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Operating Temperature (TA) | 0 | - | 70 | °C |
| Supply Voltage (VCC) | 10 | - | 30 | V |
| Start-up Current | 0.5 | 1 | - | mA |
| Operating Supply Current (IVCC) | - | 11 | 17 | mA |
| Oscillator Frequency (fOSC) | - | - | Up to 500 | kHz |
| Maximum Duty Cycle | - | - | 48% | - |
| Output Current (IOUTPUT) | - | - | 200 | mA |
| Reference Voltage (VREF) | 4.9 | 5 | 5.1 | V |
| Package Type | - | - | 14-SOIC | - |
Key Features
- 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
- Up to 500-kHz operation
Applications
- Switching regulators of any polarity
- Transformer-coupled DC-DC converters
- Off-line power supplies
- DC-DC converters
Q & A
- What is the operating temperature range of the UC3844DTR?
The operating temperature range is from 0°C to 70°C.
- What is the typical start-up current of the UC3844DTR?
The typical start-up current is 1 mA.
- What is the maximum oscillator frequency of the UC3844DTR?
The maximum oscillator frequency is up to 500 kHz.
- What is the maximum duty cycle of the UC3844DTR?
The maximum duty cycle is 48%.
- What type of package does the UC3844DTR come in?
The UC3844DTR comes in a 14-SOIC package.
- What are the key applications of the UC3844DTR?
The key applications include switching regulators, transformer-coupled DC-DC converters, off-line power supplies, and DC-DC converters.
- Does the UC3844DTR have undervoltage lockout?
- What is the reference voltage of the UC3844DTR?
The reference voltage is typically 5 V, with a range of 4.9 V to 5.1 V.
- Does the UC3844DTR have pulse-by-pulse current limiting?
- What is the output current capability of the UC3844DTR?
The output current capability is up to 200 mA.
