Overview
The TL2845BD-8 is a high-performance current-mode Pulse Width Modulation (PWM) controller produced by Texas Instruments. This integrated circuit is designed to implement off-line or dc-to-dc fixed-frequency current-mode control schemes with a minimum number of external components. It is part of the TL284xB and TL384xB series, which offer enhanced features and improvements over the standard TL284x and TL384x series.
The device is optimized for various power supply applications, including boost, flyback, and forward converter topologies. It operates within a temperature range of -40°C to 85°C, making it suitable for a wide range of environments.
Key Specifications
| Parameter | Value |
|---|---|
| Package | SOIC (D), 8 pins |
| Operating Temperature Range | -40°C to 85°C |
| Switching Frequency | Up to 500 kHz |
| Output Current | 0.2 A |
| Undervoltage Lockout (UVLO) | 8.4 V (on), 7.6 V (off) |
| Duty Cycle Range | 0% to 50% |
| Start-Up Current | < 0.5 mA |
| Oscillator Discharge Current | 8.3 mA (typ) |
Key Features
- Low Start-Up Current (< 0.5 mA)
- Trimmed Oscillator Discharge Current
- Current Mode Operation up to 500 kHz
- Automatic Feed-Forward Compensation
- Latching PWM for Cycle-by-Cycle Current Limiting
- Internally Trimmed Reference With Undervoltage Lockout
- High-Current Totem-Pole Output With Hysteresis
- Double-Pulse Suppression
Applications
The TL2845BD-8 is suitable for a diverse range of applications, including:
- Off-line and dc-to-dc converters
- Consumer electronics
- Industrial systems
- Telecommunications
- Boost, flyback, and forward converter topologies
Q & A
- What is the operating temperature range of the TL2845BD-8?
The operating temperature range is -40°C to 85°C.
- What is the maximum switching frequency of the TL2845BD-8?
The maximum switching frequency is up to 500 kHz.
- What are the UVLO thresholds for the TL2845BD-8?
The UVLO thresholds are 8.4 V (on) and 7.6 V (off).
- What is the duty cycle range of the TL2845BD-8?
The duty cycle range is 0% to 50%.
- What is the start-up current of the TL2845BD-8?
The start-up current is less than 0.5 mA.
- What type of output stage does the TL2845BD-8 have?
The output stage is a high-current totem-pole output suitable for driving N-channel MOSFETs.
- What are some of the key features of the TL2845BD-8?
Key features include low start-up current, trimmed oscillator discharge current, current mode operation, automatic feed-forward compensation, and latching PWM for cycle-by-cycle current limiting.
- What are the typical applications of the TL2845BD-8?
Typical applications include off-line and dc-to-dc converters, consumer electronics, industrial systems, and telecommunications.
- What package types are available for the TL2845BD-8?
The TL2845BD-8 is available in an 8-pin SOIC (D) package.
- How does the TL2845BD-8 handle undervoltage lockout conditions?
During undervoltage lockout conditions, the output has a maximum saturation voltage of 1.2 V while sinking 10 mA (VCC = 5 V).
