Overview
The NCP1937B1DR2G is a highly integrated power management IC from ON Semiconductor, designed to combine critical mode (CrM) power factor correction (PFC) and quasi-resonant (QR) flyback controller functionalities. This IC is optimized for off-line adapter applications, offering a compact and highly efficient solution for Switched Mode Power Supplies (SMPS). The device integrates all necessary features for robust and efficient PFC and flyback stages, minimizing the number of external components required.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| VCC Range | 9 | - | 30 | V |
| Startup Voltage | - | - | 700 | V |
| Brown-out Threshold (Start) | 102 | 111 | 120 | V |
| Brown-out Threshold (Stop) | 86 | 101 | 116 | V |
| PFC Frequency Clamp | 112 | 215 | 285 | kHz |
| Gate Driver Current (Source/Sink) | 0.5 / 0.8 | - | - | A |
| Internal Temperature Shutdown | -40 | - | 125 | °C |
| Package Type | - | - | SOIC-20 (Pb-Free) | - |
Key Features
- Power Factor Correction (PFC): Operates in Critical Conduction Mode (CrM) with constant on-time control and maximum frequency clamp, ensuring near-unity power factor.
- Quasi-Resonant Flyback Stage: Features valley-lockout circuitry for stable valley switching and frequency foldback with a minimum frequency clamp to eliminate audible noise.
- High-Voltage Startup and Brown-out Detection: Includes high-voltage startup circuit and active input filter capacitor discharge circuitry, along with integrated high-voltage brown-out detector.
- Gate Drivers and Fault Protection: Provides 0.5 A / 0.8 A source/sink gate drivers and includes fault input for severe fault conditions with latch and auto-recovery options.
- Low Standby Power Consumption: Offers skip mode operation for excellent efficiency in light load conditions and very low standby power consumption.
- Internal Temperature Shutdown and Power Savings Mode: Includes internal temperature shutdown and a power savings mode that reduces supply current consumption to 70 μA.
Applications
The NCP1937B1DR2G is primarily designed for off-line adapter applications, particularly in scenarios requiring high efficiency and compact design. It is suitable for use in:
- Switched Mode Power Supplies (SMPS)
- Offline power adapters
- High-efficiency power conversion systems
- Consumer electronics power supplies
Q & A
- What is the primary function of the NCP1937B1DR2G?
The NCP1937B1DR2G is a combination critical mode (CrM) power factor correction (PFC) and quasi-resonant (QR) flyback controller.
- What is the VCC range for the NCP1937B1DR2G?
The VCC range is from 9 V to 30 V.
- What type of package does the NCP1937B1DR2G come in?
The NCP1937B1DR2G comes in a SOIC-20 (Pb-Free) package.
- What are the key features of the PFC stage in the NCP1937B1DR2G?
The PFC stage operates in Critical Conduction Mode (CrM) with constant on-time control and maximum frequency clamp, ensuring near-unity power factor.
- How does the quasi-resonant flyback stage operate?
The quasi-resonant flyback stage features valley-lockout circuitry for stable valley switching and frequency foldback with a minimum frequency clamp to eliminate audible noise.
- What are the gate driver specifications for the NCP1937B1DR2G?
The gate drivers provide 0.5 A / 0.8 A source/sink current.
- Does the NCP1937B1DR2G have built-in fault protection?
Yes, it includes fault input for severe fault conditions with latch and auto-recovery options.
- How does the NCP1937B1DR2G manage standby power consumption?
The device offers skip mode operation for excellent efficiency in light load conditions and very low standby power consumption, with a power savings mode that reduces supply current consumption to 70 μA.
- What is the operating temperature range for the NCP1937B1DR2G?
The operating temperature range is from -40°C to 125°C.
- What are some common applications for the NCP1937B1DR2G?
It is suitable for use in Switched Mode Power Supplies (SMPS), offline power adapters, high-efficiency power conversion systems, and consumer electronics power supplies.
