Overview
The TL494ING, produced by onsemi, is a fixed-frequency pulse width modulation (PWM) control circuit designed primarily for switch mode power supply control. This integrated circuit incorporates the primary building blocks necessary for controlling switching power supplies, including an on-chip oscillator, error amplifiers, and a 5.0 V reference voltage source. The TL494ING is versatile and can be used in various configurations, such as push-pull or single-ended operations, making it a reliable choice for a wide range of power supply applications.
Key Specifications
| Parameter | Symbol | 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) | IC1, IC2 | - | - | 500 mA | mA |
| Operating Junction Temperature | TJ | - | - | 125 | °C |
| Storage Temperature Range | Tstg | -55 | - | 125 | °C |
| Operating Ambient Temperature Range | TA | -40 to +125 | - | - | °C |
| Power Dissipation @ TA ≤ 45°C | PD | - | - | 1000 mW | mW |
| Thermal Resistance, Junction-to-Ambient | RθJA | - | - | 80 °C/W | °C/W |
Key Features
- Complete Pulse Width Modulation Control Circuitry
- On-Chip Oscillator with Master or Slave Operation
- On-Chip Error Amplifiers
- On-Chip 5.0 V Reference capable of sourcing up to 10 mA
- Adjustable Deadtime Control
- Uncommitted Output Transistors Rated to 500 mA Source or Sink
- Output Control for Push-Pull or Single-Ended Operation
- Undervoltage Lockout
- Pb-Free Packages Available
Applications
The TL494ING is widely used in switch mode power supply control applications, including but not limited to:
- Switching Power Supplies
- DC-DC Converters
- Power Inverters
- Automotive and Industrial Power Systems
Q & A
- What is the primary function of the TL494ING?
The TL494ING is a fixed-frequency pulse width modulation control circuit designed primarily for switch mode power supply control. - What is the range of the power supply voltage for the TL494ING?
The power supply voltage range is from 7.0 V to 40 V. - What is the maximum collector output current for each transistor?
The maximum collector output current for each transistor is 500 mA. - Does the TL494ING have an internal reference voltage source?
Yes, the TL494ING has an internal 5.0 V reference voltage source capable of sourcing up to 10 mA. - Can the TL494ING be used in both push-pull and single-ended configurations?
Yes, the TL494ING can be used in both push-pull and single-ended configurations. - What is the operating junction temperature range for the TL494ING?
The operating junction temperature range is from -40°C to 125°C. - Is the TL494ING available in Pb-Free packages?
Yes, the TL494ING is available in Pb-Free packages. - What is the purpose of the undervoltage lockout feature?
The undervoltage lockout feature prevents the device from operating below a certain voltage threshold, ensuring reliable operation. - How is the oscillator frequency programmed in the TL494ING?
The oscillator frequency is programmed using two external components, RT and CT. - What are some common applications of the TL494ING?
The TL494ING is commonly used in switching power supplies, DC-DC converters, power inverters, and automotive and industrial power systems.
