Overview
The TL494BDR2 is a pulse-width modulation (PWM) control circuit produced by onsemi. This integrated circuit is designed primarily for switch-mode power supply control and offers a comprehensive set of features to facilitate the construction of PWM control circuits. The TL494BDR2 is part of the TL494 family, which includes various package options and configurations, including Pb-free versions.
The device integrates all necessary functions for PWM control, including an on-chip oscillator, error amplifiers, a dead-time control comparator, and output-control circuits. This makes it a versatile component for a wide range of power supply applications.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Power Supply Voltage (VCC) | 7.0 | 15 | 40 | V |
| Collector Output Voltage (VC1, VC2) | -30 | - | 40 | V |
| Collector Output Current (Each transistor) | - | - | 200 | mA |
| Oscillator Frequency | 1.0 | 40 | 200 | kHz |
| Reference Voltage (Vref) | 4.75 | 5.0 | 5.25 | V |
| Maximum Duty Cycle | - | - | 48% | % |
| Operating Temperature Range | 0 | - | 70 | °C |
Key Features
- Complete PWM Power-Control Circuitry: Includes on-chip oscillator, error amplifiers, dead-time control comparator, and output-control circuits.
- On-Chip Oscillator with Master or Slave Operation: Allows for flexible synchronization in multiple-rail power supplies.
- On-Chip Error Amplifiers: With a common-mode voltage range from –0.3 V to VCC – 2 V.
- On-Chip 5.0 V Reference: Capable of sourcing up to 10 mA of load current with an internal accuracy of ±5.0% and thermal drift of less than 50 mV over the operating temperature range.
- Adjustable Deadtime Control: Provides control over the total range of dead time.
- Uncommitted Output Transistors: Rated to 500 mA source or sink current, supporting push-pull or single-ended operation.
- Undervoltage Lockout: Ensures safe operation by preventing the device from functioning below a certain voltage threshold.
- Pb-Free Packages Available: Suitable for applications requiring lead-free components.
Applications
- Desktop PCs and Server PSUs: Ideal for power supply control in computing systems.
- Microwave Ovens and Washing Machines: Used in various household appliances requiring efficient power management.
- Power Supplies (AC/DC, Isolated, With or Without PFC): Suitable for a wide range of power supply configurations.
- Solar Micro-Inverters and Solar Power Inverters: Essential for renewable energy systems.
- E-Bikes and Telecom/Server AC/DC Supplies: Used in transportation and communication infrastructure).
- Smoke Detectors: Reliable component for safety-critical devices).
Q & A
- What is the primary function of the TL494BDR2?
The TL494BDR2 is a pulse-width modulation (PWM) control circuit designed primarily for switch-mode power supply control.
- What is the operating voltage range of the TL494BDR2?
The power supply voltage (VCC) range is from 7.0 V to 40 V.
- What is the maximum duty cycle of the TL494BDR2?
The maximum duty cycle is 48%.
- Does the TL494BDR2 have an internal oscillator?
- What is the reference voltage provided by the TL494BDR2?
The device provides a stable 5.0 V reference voltage with an internal accuracy of ±5.0%.
- Can the TL494BDR2 operate in push-pull or single-ended mode?
- What is the maximum output current of the uncommitted transistors?
- Does the TL494BDR2 have undervoltage lockout protection?
- What are the typical applications of the TL494BDR2?
- Is the TL494BDR2 available in Pb-free packages?
