Overview
The NCV494BDR2G is a fixed-frequency pulse width modulation (PWM) control circuit produced by onsemi. It is designed primarily for switch-mode power supply control and is part of the TL494 and NCV494 series. This component is particularly suited for automotive and other applications requiring site and change control due to its robust specifications and reliability.
The device features an on-chip oscillator, error amplifiers, a 5.0 V reference, and uncommitted output transistors. It supports both push-pull and single-ended operation and includes undervoltage lockout and adjustable deadtime control. The NCV494BDR2G is available in a Pb-free SOIC-16 package, making it compliant with environmental regulations.
Key Specifications
| Characteristics | 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 Ambient Temperature Range | TA | -40 | - | 125 | °C |
| Reference Voltage | Vref | 4.75 | 5.0 | 5.25 | V |
| Oscillator Frequency | fosc | 1.0 kHz | 40 kHz | 200 kHz | kHz |
| Maximum Duty Cycle (Push-Pull Mode) | DCmax | 45% | - | 50% | % |
| Undervoltage Lockout Turn-On Threshold | Vth | 5.5 V | 6.43 V | 7.0 V | V |
Key Features
- Complete PWM Control Circuitry: Includes on-chip oscillator, error amplifiers, and PWM comparator.
- On-Chip Oscillator: Supports master or slave operation with adjustable frequency.
- 5.0 V Reference: Capable of sourcing up to 10 mA of load current with high accuracy and low thermal drift.
- Uncommitted Output Transistors: Rated to 500 mA source or sink current.
- Output Control: Supports push-pull or single-ended operation.
- Undervoltage Lockout: Protects the device from low voltage conditions.
- Adjustable Deadtime Control: Allows for precise control over the deadtime between output signals.
- Pb-Free Package: Compliant with environmental regulations.
Applications
The NCV494BDR2G is widely used in various switch-mode power supply applications, including:
- Automotive Systems: Due to its robust specifications and reliability, it is suitable for automotive applications requiring site and change control.
- Pulse Width Modulated (PWM) Converters: Ideal for push-pull and single-ended PWM converters.
- Power Supply Control: Used in the control of switch-mode power supplies, ensuring efficient and stable output.
- Industrial Power Systems: Suitable for industrial power systems that require high reliability and precision control.
Q & A
- What is the primary application of the NCV494BDR2G?
The NCV494BDR2G is primarily used for switch-mode power supply control.
- What is the operating ambient temperature range of the NCV494BDR2G?
The operating ambient temperature range is -40°C to +125°C.
- What is the maximum collector output current for each transistor?
The maximum collector output current for each transistor is 500 mA.
- Does the NCV494BDR2G have an internal reference voltage?
Yes, it has an internal 5.0 V reference capable of sourcing up to 10 mA of load current.
- What is the typical oscillator frequency range of the NCV494BDR2G?
The typical oscillator frequency range is from 1.0 kHz to 200 kHz.
- Does the NCV494BDR2G support push-pull and single-ended operation?
Yes, it supports both push-pull and single-ended operation.
- What is the purpose of the undervoltage lockout feature?
The undervoltage lockout feature protects the device from operating under low voltage conditions.
- Is the NCV494BDR2G available in a Pb-free package?
Yes, it is available in a Pb-free SOIC-16 package.
- What is the maximum duty cycle in push-pull mode?
The maximum duty cycle in push-pull mode is up to 50%.
- What is the turn-on threshold voltage for the undervoltage lockout?
The turn-on threshold voltage for the undervoltage lockout is between 5.5 V and 7.0 V.
