Overview
The NCP1589AMNTWG is a low-cost PWM (Pulse Width Modulation) controller designed by onsemi. This device is part of the NCP1589A/B series, which operates from a 5 V or 12 V supply and is capable of producing output voltages as low as 0.8 V. It is a 10-pin device that offers an optimal level of integration to reduce the size and cost of power supplies. The NCP1589AMNTWG is particularly suited for applications requiring efficient voltage regulation and protection features.
Key Specifications
| Characteristic | Min | Typ | Max | Unit |
|---|---|---|---|---|
| VCC Voltage Range | 4.5 | 13.2 | V | |
| Boost Voltage Range | 30 | V | ||
| Quiescent Supply Current (NCP1589A) | 1.0 | 8.0 | mA | |
| UVLO Threshold VCC Rising | 3.8 | 4.0 | 4.2 | V |
| UVLO Threshold VCC Falling | 3.4 | 3.6 | 3.8 | V |
| Oscillator Frequency (NCP1589A) | 270 | 300 | 330 | kHz |
| Oscillator Frequency (NCP1589B) | 540 | 600 | 660 | kHz |
| Minimum Duty Cycle | 0 | % | ||
| Maximum Duty Cycle | 80 | % | ||
| LG Minimum on Time | 500 | ns | ||
| Error Amplifier Open Loop DC Gain | 70 | 80 | dB | |
| Upper Gate Source Current | 1.5 | A | ||
| Lower Gate Source Current | 1.5 | A | ||
| Operating Junction Temperature Range | 0 | 150 | °C | |
| Operating Ambient Temperature Range | 0 | 70 | °C |
Key Features
- Voltage Mode PWM Control: The NCP1589AMNTWG uses voltage mode PWM control for efficient voltage regulation.
- Internal 1.5 A Gate Drivers: The device includes internal 1.5 A gate drivers for both the upper and lower MOSFETs.
- Adjustable Output Voltage: The output voltage can be adjusted from 0.8 V to 5.0 V using an external resistor divider network.
- Programmable Current Limit: The overcurrent protection threshold can be set externally using the ROCSET resistor.
- Internal Soft-Start: The device features an internal soft-start mechanism to prevent excess inrush current during startup.
- Protection Features: Includes undervoltage lockout (UVLO), overvoltage protection (OVP), and under voltage protection (UVP).
- Power Good Output: The PGOOD pin signals the status of the output voltage, indicating if it is within the specified range.
Applications
- Graphics Cards: Suitable for power supply modules in graphics cards.
- Desktop Computers: Used in power supply units for desktop computers.
- Servers and Networking: Applied in power supply systems for servers and networking equipment.
- DSP & FPGA Power Supply: Ideal for powering Digital Signal Processors (DSP) and Field-Programmable Gate Arrays (FPGA).
- DC-DC Regulator Modules: Used in various DC-DC converter modules.
Q & A
- What is the operating voltage range for the VCC pin of the NCP1589AMNTWG?
The VCC pin operates within a voltage range of 4.5 V to 13.2 V.
- What are the available oscillator frequencies for the NCP1589A/B series?
The NCP1589A operates at 300 kHz, and the NCP1589B operates at 600 kHz.
- How is the output voltage adjusted in the NCP1589AMNTWG?
The output voltage can be adjusted from 0.8 V to 5.0 V using an external resistor divider network connected to the FB pin.
- What is the purpose of the PGOOD pin?
The PGOOD pin is an open-drain active-high output that signals the condition of the output voltage, indicating if it is within the specified range.
- How does the overcurrent protection work in the NCP1589AMNTWG?
The overcurrent protection is based on the voltage drop across the low-side MOSFET and can be set externally using the ROCSET resistor.
- What are the protection features included in the NCP1589AMNTWG?
The device includes undervoltage lockout (UVLO), overvoltage protection (OVP), and under voltage protection (UVP).
- How does the internal soft-start mechanism work?
The internal soft-start mechanism ramps the reference voltage from 0 to 0.8 V over a period of 4 ms to prevent excess inrush current during startup.
- What is the maximum duty cycle for the NCP1589AMNTWG?
The maximum duty cycle is 80%.
- What is the minimum on-time for the LG pin?
The minimum on-time for the LG pin is 500 ns.
- What is the operating junction temperature range for the NCP1589AMNTWG?
The operating junction temperature range is from 0°C to 150°C.
