Overview
The NCP1680ABD1R2G, produced by onsemi, is a Critical Conduction Mode (CrM) Power Factor Correction (PFC) controller IC. It is designed to drive the bridgeless totem pole PFC topology, which eliminates the diode bridge present at the input of conventional PFC circuits. This topology significantly improves efficiency and power density by reducing the number of devices in the conduction path and using active switches instead of bridge diodes.
The NCP1680ABD1R2G supports both CrM and Discontinuous Conduction Mode (DCM) with valley turn-on under light load conditions, ensuring high efficiency across various operating conditions. It also features digital loop compensation, simplified valley sensing, and a novel current limit scheme that eliminates the need for Hall Effect sensors.
Key Specifications
| Rating | Pin | Symbol | Value | Unit |
|---|---|---|---|---|
| Supply Input Voltage, VCC Pin | VCC | VCC(MAX) | −0.3 to 30 | V |
| PWML Pin Maximum Voltage | PWML | VPWML(MAX) | −0.3 to 5.5 | V |
| PWML Pin Maximum Current | PWML | IPWML(SRC_MAX) / IPWML(SNK_MAX) | −100 / +160 | mA |
| PWMH Pin Maximum Voltage | PWMH | VPWMH(MAX) | −0.3 to 5.5 | V |
| PWMH Pin Maximum Current | PWMH | IPWMH(SRC_MAX) / IPWMH(SNK_MAX) | −100 / +160 | mA |
| SRx, Polarity Pin Maximum Voltage | SRL, SRH, Polarity | VSRx(MAX) | −0.3 to 14 | V |
| SRx, Polarity Pin Maximum Current | SRL, SRH, Polarity | ISRx(SRC_MAX) / ISRx(SNK_MAX) | −100 / +160 | mA |
| AUX Pin Input Voltage | AUX | VAUX | −0.3 to 5.5 | V |
| Maximum Junction Temperature | TJ(MAX) | 150 | °C | |
| Operating Temperature Range | TJ | −40 to +125 | °C | |
| Storage Temperature Range | TJ | −60 to +150 | °C |
Key Features
- Totem Pole PFC Topology: Eliminates input diode bridge, enabling very high efficiency and compact design.
- AC Line Monitoring Circuit & AC Phase Detection.
- Brownout Detection.
- Critical Conduction Mode (CrM) Operation.
- Discontinuous Conduction Mode (DCM) with Valley Turn On under light load conditions.
- Frequency Foldback in DCM with 25 kHz minimum frequency.
- Digital Loop Compensation.
- Simplified Valley Sensing.
- Novel Current Limit Scheme: Eliminates the need for Hall Effect sensors.
- Soft Skip Mode with a Skip Flag for optimizing light load performance.
- Near Unity Power Factor in all operating modes.
- PFCOK Indicator.
- Safety Features:
- Soft and Fast Overvoltage Protection.
- 2-Level Latch Input for OVP & OTP.
- Bulk Undervoltage Protection.
- Internal Thermal Shutdown.
- Cycle-by-Cycle Current Limit.
Applications
- 5G/Telecom Power Supplies.
- Industrial Power Supplies.
- Gaming Console Power Supplies.
- Ultra High Density (UHD) Power Supplies.
- Merchant Power.
Q & A
- What is the NCP1680ABD1R2G used for?
The NCP1680ABD1R2G is a Power Factor Correction (PFC) controller IC designed to drive the bridgeless totem pole PFC topology, improving efficiency and power density in power supplies.
- What are the key benefits of the totem pole PFC topology?
The totem pole PFC topology eliminates the input diode bridge, reducing losses and increasing system efficiency and power density.
- What operating modes does the NCP1680ABD1R2G support?
The NCP1680ABD1R2G supports both Critical Conduction Mode (CrM) and Discontinuous Conduction Mode (DCM) with valley turn-on under light load conditions.
- What safety features does the NCP1680ABD1R2G include?
The NCP1680ABD1R2G includes soft and fast overvoltage protection, 2-level latch input for OVP & OTP, bulk undervoltage protection, internal thermal shutdown, and cycle-by-cycle current limit.
- What is the maximum junction temperature for the NCP1680ABD1R2G?
The maximum junction temperature for the NCP1680ABD1R2G is 150°C.
- What is the operating temperature range for the NCP1680ABD1R2G?
The operating temperature range for the NCP1680ABD1R2G is −40°C to +125°C.
- What types of switches can be used with the NCP1680ABD1R2G?
The NCP1680ABD1R2G can use either silicon FETs or Wide Bandgap (WBG) transistors such as Silicon Carbide (SiC) or Gallium Nitride (GaN).
- How does the NCP1680ABD1R2G handle line voltage sensing?
The NCP1680ABD1R2G uses external resistor dividers to perform differential line sensing, with the LVSNS1 and LVSNS2 pins monitoring the AC line voltage.
- What applications is the NCP1680ABD1R2G suitable for?
The NCP1680ABD1R2G is suitable for 5G/Telecom power supplies, industrial power supplies, gaming console power supplies, ultra high density (UHD) power supplies, and merchant power applications.
- What is the purpose of the PFCOK indicator?
The PFCOK indicator signals that the PFC operation is within specified limits, ensuring near unity power factor in all operating modes.
