Overview
The UC3845ADG4 is a high-performance current-mode PWM controller produced by Unitrode, now part of Texas Instruments. This device is designed for use in off-line and DC-DC converter applications, offering a robust set of features that make it suitable for a variety of power management needs.
The UC3845ADG4 is part of the UC384x series, known for its reliability and versatility in power conversion systems. It is particularly useful in applications requiring high efficiency, precision, and reliability.
Key Specifications
| Parameter | Value |
|---|---|
| Part Number | UC3845ADG4 |
| Manufacturer | Unitrode (Texas Instruments) |
| Package / Case | 8-SOIC |
| Voltage - Supply (Vcc/Vdd) | 7.6 V ~ 30 V |
| Frequency - Switching | Up to 500 kHz |
| Duty Cycle (Max) | 50% |
| Output Phases | 1 |
| Output Type | Transistor Driver |
| Operating Temperature | 0°C to 70°C |
| UVLO Thresholds | 8.4 V (on), 7.6 V (off) |
Key Features
- Current Mode Operation: The UC3845ADG4 operates in current mode, allowing for precise control over the output switch conduction based on the peak inductor current.
- Adjustable Output Deadtime: The device allows for adjustable output deadtime from 50% to 70%, enabling flexible control over the switching cycle.
- Automatic Feed Forward Compensation: This feature enhances the stability and performance of the power conversion system.
- Latching PWM for Cycle-by-Cycle Current Limiting: This ensures that the output switch conduction is limited on a cycle-by-cycle basis, preventing overcurrent conditions.
- Input and Reference Undervoltage Lockouts: These protective features ensure the device operates within safe voltage ranges, preventing damage from undervoltage conditions.
Applications
- Off-Line Converters: The UC3845ADG4 is well-suited for off-line power supplies, where it can manage the conversion from AC to DC efficiently.
- DC-DC Converters: It is also used in DC-DC conversion applications, including step-up, step-down, and buck-boost converters.
- Power Supplies: The device is commonly used in various power supply designs, including those for industrial, medical, and consumer electronics.
- Motor Control: Its current-mode operation makes it suitable for motor control applications where precise current regulation is necessary.
Q & A
- What is the primary function of the UC3845ADG4?
The UC3845ADG4 is a current-mode PWM controller designed for use in off-line and DC-DC converter applications.
- What is the voltage supply range for the UC3845ADG4?
The voltage supply range for the UC3845ADG4 is from 7.6 V to 30 V.
- What is the maximum switching frequency of the UC3845ADG4?
The maximum switching frequency of the UC3845ADG4 is up to 500 kHz.
- What type of output does the UC3845ADG4 provide?
The UC3845ADG4 provides a transistor driver output.
- What are the UVLO thresholds for the UC3845ADG4?
The UVLO thresholds for the UC3845ADG4 are 8.4 V (on) and 7.6 V (off).
- What is the operating temperature range for the UC3845ADG4?
The operating temperature range for the UC3845ADG4 is from 0°C to 70°C.
- Does the UC3845ADG4 support adjustable output deadtime?
- What protective features does the UC3845ADG4 include?
The UC3845ADG4 includes input and reference undervoltage lockouts, cycle-by-cycle current limiting, and other protective features.
- In what types of applications is the UC3845ADG4 commonly used?
The UC3845ADG4 is commonly used in off-line converters, DC-DC converters, power supplies, and motor control applications.
- What package types are available for the UC3845ADG4?
The UC3845ADG4 is available in an 8-pin SOIC package.
