Overview
The NCV8873, specifically the NCV887300D1R2G model, is an automotive-grade non-synchronous boost controller produced by ON Semiconductor. This device is designed to drive an external N-channel MOSFET and is suitable for applications requiring high reliability and robust protection features. It operates using peak current mode control with internal slope compensation, ensuring efficient and stable voltage regulation.
The NCV8873 is AEC-Q100 qualified and PPAP capable, making it ideal for automotive and other demanding environments. It features a wide input voltage range of 3.2 V to 40 V, with a peak transient voltage capability of 45 V, and is housed in a Pb-free SOIC-8 package.
Key Specifications
| Characteristic | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Dc Supply Voltage (VIN) | VIN | -0.3 | - | 40 | V |
| Peak Transient Voltage (Load Dump on VIN) | - | - | - | 45 | V |
| Dc Supply Voltage (VDRV, GDRV) | VDRV, GDRV | - | - | 12 | V |
| Operating Junction Temperature | TJ | -40 | - | 150 | °C |
| Storage Temperature Range | - | -65 | - | 150 | °C |
| Switching Frequency | fs | 153 | 170 | 187 | kHz |
| Soft-Start Time | tss | 6.0 | 7.4 | 8.8 | ms |
| Current Limit Threshold Voltage | Vcl | 360 | 400 | 440 | mV |
| Quiescent Current, Sleep Mode | Iq,sleep | - | 2.0 | 6.0 | µA |
Key Features
- Peak Current Mode Control with Internal Slope Compensation: Ensures efficient and stable voltage regulation by comparing the PWM ramp signal to the output of the error amplifier.
- Fixed Frequency Operation: Maintains a constant operational frequency, which can be externally synchronized.
- Wide Input Voltage Range: Operates from 3.2 V to 40 V, with a peak transient voltage capability of 45 V.
- Input Undervoltage Lockout (UVLO): Protects the device from low input voltages.
- Internal Soft-Start: Gradually increases the output voltage to prevent inrush currents.
- Low Quiescent Current in Sleep Mode: Minimizes power consumption when the device is in sleep mode.
- Cycle-by-Cycle Current Limit Protection: Limits the peak switching current to prevent overcurrent conditions.
- Thermal Shutdown (TSD): Protects the device from overheating.
- Pb-Free Device: Compliant with environmental regulations.
Applications
The NCV8873 is designed for use in various automotive and industrial applications where high reliability and robust protection are essential. Some common applications include:
- Automotive systems: Battery management, LED lighting, and other power conversion needs.
- Industrial power supplies: Where a wide input voltage range and high efficiency are required.
- LED drivers: For high brightness LED strings, providing constant current loads.
- General power conversion: Boost converters in discontinuous conduction mode (DCM) or continuous conduction mode (CCM).
Q & A
- What is the input voltage range of the NCV8873?
The input voltage range is from 3.2 V to 40 V, with a peak transient voltage capability of 45 V.
- What type of control mode does the NCV8873 use?
The NCV8873 uses peak current mode control with internal slope compensation.
- What are the key protection features of the NCV8873?
The device includes cycle-by-cycle current limit protection, thermal shutdown, and input undervoltage lockout.
- How does the soft-start feature work in the NCV8873?
The internal soft-start feature gradually increases the output voltage to prevent inrush currents.
- Can the switching frequency of the NCV8873 be externally synchronized?
- What is the typical quiescent current in sleep mode for the NCV8873?
The typical quiescent current in sleep mode is 2.0 µA.
- What is the maximum operating junction temperature for the NCV8873?
The maximum operating junction temperature is 150°C.
- Is the NCV8873 AEC-Q100 qualified?
- What type of package does the NCV887300D1R2G come in?
The device comes in a Pb-free SOIC-8 package.
- How does the current sense amplifier work in the NCV8873?
The current sense amplifier senses the switching current through a current-sense resistor connected to the source of the external N-MOSFET.
