Overview
The UC3845DTRG4 is a current-mode PWM (Pulse Width Modulation) controller IC produced by Texas Instruments. This device is part of the UC3845 series and is designed for a wide range of power management applications, including off-line and DC-to-DC converters. It offers a high level of flexibility and ease of use, making it an ideal choice for various design scenarios. The UC3845DTRG4 is packaged in a 14-pin SOIC (Small Outline Integrated Circuit) package, which is suitable for surface-mount technology (SMT) and is compact enough for space-constrained designs.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package Type | SOIC-14 | |
| Control Method | Peak Current Mode | |
| Frequency (Max) | 500 kHz | |
| Frequency (Min) | 26 kHz | |
| Duty Cycle (Max) | 50% | |
| Gate Drive (Typ) | 1 A | |
| Operating Temperature Range | 0°C to 70°C | |
| UVLO Thresholds On/Off | 8.4V / 7.6V | |
| Supply Voltage Range | 8.4V to 30V | |
| Topology | Boost, Buck, Buck-Boost, Flyback, Forward |
Key Features
- PWM controller with internal oscillator and adjustable frequency up to 500 kHz
- Wide input voltage range: -0.3V to 6.3V
- High supply voltage range: 8.4V to 30V
- Low start-up current (< 1mA)
- Automatic feedforward compensation and pulse-by-pulse current limiting
- Enhanced load-response characteristics and undervoltage lockout with hysteresis
- Double-pulse suppression and high-current totem-pole output
- Internally trimmed bandgap reference and error amplifier with low output resistance
Applications
- Power supplies
- Battery chargers
- Motor control circuits
- Industrial automation systems
- Off-line and DC-to-DC converters
Q & A
- What is the UC3845DTRG4 used for?
The UC3845DTRG4 is used in various power management applications, including power supplies, battery chargers, motor control circuits, and industrial automation systems.
- What is the maximum operating frequency of the UC3845DTRG4?
The maximum operating frequency of the UC3845DTRG4 is up to 500 kHz.
- What is the operating temperature range of the UC3845DTRG4?
The operating temperature range of the UC3845DTRG4 is from 0°C to 70°C.
- What are the UVLO thresholds for the UC3845DTRG4?
The UVLO thresholds for the UC3845DTRG4 are 8.4V for turn-on and 7.6V for turn-off.
- What are the key features of the UC3845DTRG4's output stage?
The output stage of the UC3845DTRG4 is a high-current totem-pole output designed to source or sink high-peak current, and it is optimized for driving N-channel MOSFETs.
- What types of topologies does the UC3845DTRG4 support?
The UC3845DTRG4 supports various topologies including Boost, Buck, Buck-Boost, Flyback, and Forward.
- What is the typical gate drive current of the UC3845DTRG4?
The typical gate drive current of the UC3845DTRG4 is 1 A.
- Does the UC3845DTRG4 have automatic feedforward compensation?
Yes, the UC3845DTRG4 features automatic feedforward compensation.
- What is the package type of the UC3845DTRG4?
The UC3845DTRG4 is packaged in a 14-pin SOIC (Small Outline Integrated Circuit) package.
- Is the UC3845DTRG4 suitable for surface-mount technology?
Yes, the UC3845DTRG4 is suitable for surface-mount technology (SMT).
