Overview
The UC2845BD1R2G is a high-performance pulse width modulation (PWM) controller IC produced by onsemi. This device is designed for use in power management applications, particularly in AC-DC converters such as boost, flyback, and forward converters. It features an 8-pin SOIC (Small Outline Integrated Circuit) package, making it compact and suitable for a variety of power supply designs.
Key Specifications
| Characteristic | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Operating Ambient Temperature Range | TA | -40 | - | 85 | °C |
| Oscillator Discharge Current (VOSC = 2.0 V, TJ = 25°C) | Idischg | 7.5 | 7.8 | 8.3 | mA |
| Voltage Feedback Input (VO = 2.5 V) | VFB | 2.42 | 2.5 | 2.58 | V |
| Input Bias Current (VFB = 5.0 V) | IIB | - | -0.1 | -2.0 | μA |
| Open Loop Voltage Gain (VO = 2.0 V to 4.0 V) | AVOL | 65 | 90 | - | dB |
| Unity Gain Bandwidth (TJ = 25°C) | BW | 0.7 | 1.0 | - | MHz |
| Power Supply Rejection Ratio (VCC = 12 V to 25 V) | PSRR | 60 | 70 | - | dB |
| Output Current - Sink (VO = 1.1 V, VFB = 2.7 V) | ISink | 2.0 | - | 12 | mA |
| Output Voltage Swing High State (RL = 15 k to ground, VFB = 2.3 V) | VOH | 5.0 | - | 6.2 | V |
| Output Voltage Swing Low State (RL = 15 k to Vref, VFB = 2.7 V) | VOL | 0.8 | - | 1.1 | V |
| Current Sense Input Voltage Gain | AV | 2.85 | 3.0 | 3.15 | V/V |
| Maximum Current Sense Input Threshold | Vth | 0.9 | 1.0 | 1.1 | V |
Key Features
- High-Performance PWM Controller: Designed for high-efficiency power conversion in AC-DC converters.
- Undervoltage Lockout (UVLO): Ensures the IC is fully functional before the output stage is enabled, with separate comparators for VCC and Vref.
- Current Sense and Feedback: Includes current sense input with voltage gain and feedback input for precise control.
- Compact Package: 8-pin SOIC package for space-efficient designs.
- Wide Operating Temperature Range: Operates from -40°C to 85°C.
- High Output Current Capability: Can sink and source up to 12 mA.
Applications
The UC2845BD1R2G is suitable for a variety of power management applications, including:
- Boost, Flyback, and Forward Converters: Ideal for designing high-efficiency AC-DC converters.
- Power Supplies: Used in switched-mode power supplies (SMPS) for various electronic devices.
- Industrial and Consumer Electronics: Applicable in industrial control systems, consumer electronics, and other power management needs.
Q & A
- What is the UC2845BD1R2G used for?
The UC2845BD1R2G is a pulse width modulation (PWM) controller IC used in power management applications, particularly in AC-DC converters such as boost, flyback, and forward converters. - What is the package type of the UC2845BD1R2G?
The UC2845BD1R2G comes in an 8-pin SOIC (Small Outline Integrated Circuit) package. - What are the operating temperature ranges for the UC2845BD1R2G?
The operating ambient temperature range is from -40°C to 85°C. - What is the typical oscillator discharge current for the UC2845BD1R2G?
The typical oscillator discharge current is 7.8 mA. - Does the UC2845BD1R2G have undervoltage lockout (UVLO) protection?
Yes, it has UVLO protection with separate comparators for VCC and Vref. - What is the maximum current sense input threshold for the UC2845BD1R2G?
The maximum current sense input threshold is 1.1 V. - What is the unity gain bandwidth of the UC2845BD1R2G?
The unity gain bandwidth is typically 1.0 MHz. - Can the UC2845BD1R2G be used in industrial applications?
Yes, it is suitable for use in industrial control systems and other industrial electronics. - What is the power supply rejection ratio (PSRR) of the UC2845BD1R2G?
The PSRR is typically 70 dB. - How much output current can the UC2845BD1R2G sink and source?
The UC2845BD1R2G can sink and source up to 12 mA.
