Overview
The UC2856N is a high-performance current-mode PWM (Pulse Width Modulation) controller designed by Texas Instruments. It is an enhanced version of the popular UC2846 series, offering improved speed, accuracy, and noise immunity. This controller is particularly suited for applications where rapid switching of power FETs and precise control over the switching frequency are crucial.
Key Specifications
| Parameter | Minimum | Typical | Maximum | Unit |
|---|---|---|---|---|
| Supply Voltage | - | - | 40 | V |
| Output Current (sink or source) | - | - | 1.5 A (peak) | A |
| Operating Junction Temperature | -55 | - | 150 | °C |
| Storage Temperature | -65 | - | 150 | °C |
| ESD Protection (HBM) | - | - | 4000 | V |
| ESD Protection (CDM) | - | - | 500 | V |
| Output Voltage | 5.05 | 5.1 | 5.15 | V |
| Line Regulation Voltage | - | 20 | - | mV |
| Load Regulation Voltage | - | 15 | - | mV |
Key Features
- Pin-for-pin compatible with the UC2846 series.
- Improved current sense amplifier with reduced noise sensitivity.
- Differential current sense with 3-V common-mode range.
- Trimmed oscillator discharge current for accurate deadband control.
- Accurate 1-V shutdown threshold.
- High current dual totem pole outputs (1.5-A peak).
- TTL compatible oscillator SYNC pin with 3-state function.
- ESD protection: 4-kV HBM and 500-V CDM.
Applications
The UC2856N is suitable for a variety of applications, including but not limited to:
- Automotive power systems: Qualified for automotive applications, it can be used in vehicle power management and control systems.
- High-speed power supplies: Ideal for applications requiring fast switching and precise control over power FETs.
- Industrial power systems: Used in industrial power supplies, motor control, and other high-reliability applications.
- Telecommunications: Can be used in telecom power supplies and other communication equipment.
Q & A
- What is the UC2856N? The UC2856N is a high-performance current-mode PWM controller designed by Texas Instruments.
- What are the key improvements over the UC2846 series? The UC2856N offers improved current sense amplifier, reduced noise sensitivity, and faster output stages.
- What is the operating temperature range of the UC2856N? The operating junction temperature range is -55°C to 150°C.
- What is the ESD protection level of the UC2856N? The UC2856N has 4-kV HBM and 500-V CDM ESD protection.
- Is the UC2856N compatible with the UC2846 series? Yes, it is pin-for-pin compatible with the UC2846 series.
- What are the typical output currents of the UC2856N? The typical output current is 1.5 A (peak).
- What is the common-mode range of the differential current sense? The common-mode range is 3 V.
- What is the purpose of the SYNC pin? The SYNC pin is TTL compatible and has a 3-state function when used as a sync input.
- What are some typical applications of the UC2856N? It is used in automotive power systems, high-speed power supplies, industrial power systems, and telecommunications.
- What is the shutdown threshold voltage of the UC2856N? The shutdown threshold voltage is 1 V.
