Overview
The UC3845BVD1R2 is a high-performance fixed frequency current mode controller produced by onsemi. It is part of the UC3845B series, which is specifically designed for off-line and DC-DC converter applications. This controller offers a cost-effective solution with minimal external components, making it ideal for a variety of power management applications. The device is available in an 8-pin SOIC-8 surface mount package and is Pb-free and RoHS compliant.
Key Specifications
| Attribute | Value |
|---|---|
| Supply Current - Max | 17 mA |
| Supply Voltage | 7.6 V to 36 V |
| Turn On Threshold Voltage | 8.4 V |
| Turn Off Threshold Voltage | 7.6 V |
| Duty Cycle - Max | 50% |
| Frequency - Max | 275 kHz |
| Operating Temp Range | -40°C to +105°C |
| Package Style | SOIC-8 |
| Mounting Method | Surface Mount |
Key Features
- Trimmed Oscillator for Precise Frequency Control
- Oscillator Frequency Guaranteed at 250 kHz
- Current Mode Operation to 500 kHz Output Switching Frequency
- Output Deadtime Adjustable from 50% to 70%
- Automatic Feed Forward Compensation
- Latching PWM for Cycle-By-Cycle Current Limiting
- Internally Trimmed Reference with Undervoltage Lockout
- High Current Totem Pole Output
- Undervoltage Lockout with Hysteresis
- Low Startup and Operating Current
- Pb-free and RoHS Compliant
Applications
The UC3845BVD1R2 is designed for various power management applications, including:
- Off-Line Converters
- DC-DC Converters
- Power Supply Systems
- Switch Mode Power Supplies
These controllers are particularly useful in applications where precise frequency control and high current handling are required, with the added benefit of minimal external components.
Q & A
- What is the UC3845BVD1R2 used for?
The UC3845BVD1R2 is used in off-line and DC-DC converter applications, providing a cost-effective solution with minimal external components.
- What is the operating temperature range of the UC3845BVD1R2?
The operating temperature range is -40°C to +105°C.
- What is the maximum supply voltage for the UC3845BVD1R2?
The maximum supply voltage is 36 V.
- What is the maximum output switching frequency of the UC3845BVD1R2?
The maximum output switching frequency is 500 kHz.
- Does the UC3845BVD1R2 have undervoltage lockout?
Yes, it has undervoltage lockout with hysteresis.
- Is the UC3845BVD1R2 Pb-free and RoHS compliant?
Yes, it is Pb-free and RoHS compliant.
- What package style is the UC3845BVD1R2 available in?
The UC3845BVD1R2 is available in an 8-pin SOIC-8 surface mount package.
- What is the typical oscillator frequency of the UC3845BVD1R2?
The oscillator frequency is guaranteed at 250 kHz.
- Does the UC3845BVD1R2 support adjustable output deadtime?
Yes, the output deadtime is adjustable from 50% to 70%.
- What protective features does the UC3845BVD1R2 include?
The device includes input and reference undervoltage lockouts, cycle-by-cycle current limiting, and a latch for single pulse metering.
