Overview
The UC3845ADTRG4 is a current-mode PWM (Pulse Width Modulation) controller produced by Texas Instruments. This integrated circuit is part of the UCx84x family, which is designed to implement off-line and DC-to-DC fixed-frequency current-mode control schemes with a minimal number of external components. The UC3845ADTRG4 is optimized for use in power supply applications, offering a range of features that enhance its performance and reliability.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package | SOIC (D) 14-pin | - |
| Operating Temperature Range | 0°C to 70°C | °C |
| Supply Voltage (Vcc) | 7.6 V to 30 V | V |
| Switching Frequency | Up to 500 kHz | kHz |
| Maximum Duty Cycle | 48% | % |
| Undervoltage Lockout (UVLO) | 8.4 V / 7.6 V | V |
| Output Drive Current | ±1 A | A |
| Start-up Current | < 1 mA | mA |
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
- Error amplifier with low output resistance
Applications
The UC3845ADTRG4 is suitable for a variety of power supply applications, including:
- Off-line power supplies
- DC-to-DC converters
- Buck, boost, flyback, and forward converters
- Step-up, step-down, and step-up/step-down converters
Q & A
- What is the operating temperature range of the UC3845ADTRG4?
The operating temperature range is from 0°C to 70°C.
- What is the maximum switching frequency of the UC3845ADTRG4?
The maximum switching frequency is up to 500 kHz.
- What is the maximum duty cycle of the UC3845ADTRG4?
The maximum duty cycle is 48%.
- What are the undervoltage lockout (UVLO) thresholds for the UC3845ADTRG4?
The UVLO thresholds are 8.4 V and 7.6 V.
- What is the start-up current of the UC3845ADTRG4?
The start-up current is less than 1 mA.
- What types of converters can the UC3845ADTRG4 be used in?
The UC3845ADTRG4 can be used in buck, boost, flyback, and forward converters.
- What is the output drive current capability of the UC3845ADTRG4?
The output drive current capability is ±1 A.
- Does the UC3845ADTRG4 have an internally trimmed bandgap reference?
Yes, it does have an internally trimmed bandgap reference.
- What is the package type of the UC3845ADTRG4?
The package type is SOIC (D) with 14 pins.
- Is the UC3845ADTRG4 suitable for DC-to-DC applications?
Yes, it is suitable for DC-to-DC applications.
