NCP1937 - ON Semiconductor

The pictures are for reference only, and the specific specifications can be found in the product manual.

Part No

NCP1937
Manufacturer

ON Semiconductor
ChipWorker Part#

CW1019956033
Description

Combination Power Factor Correction and Quasi- Resonant Flyback Controllers for Adapters
Documentation

Datasheet

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Product Description

This combination IC integrates power factor correction (PFC) and quasi-resonant flyback functionality necessary to implement a compact and highly efficient Switched Mode Power Supply for an adapter application.The PFC stage exhibits near-unity power factor while operating in a Critical Conduction Mode (CrM) with a maximum frequency clamp. The circuit incorporates all the features necessary for building a robust and compact PFC stage while minimizing the number of external components.The quasi-resonant current-mode flyback stage features a proprietary valley-lockout circuitry, ensuring stable valley switching. This system works down to the 4th valley and toggles to a frequency foldback mode with a minimum frequency clamp beyond the 4th valley to eliminate audible noise. Skip mode operation allows excellent efficiency in light load conditions while consuming very low standby power consumption.
Features | | Benefits
---|---|---
| | | | |
<10mW No Load Standby Performance
| |
Lowest no load performance
High Voltage Startup Circuit and Active Input Filter Capacitor Discharge Circuitry
| |
Eliminates the need for an external HV startup circuit and X2 resistors.
High Voltage Line Voltage Detector
| |
Optimize performance based on 110 v or 220 V ac mains
Integrated High Voltage Switch Disconnects PFC Feedback Resistor Divider
| |
Reduces no load standby power
Fault Input for Severe Fault Conditions
| |
Enhanced protection capability
Bi-Level Line-Dependent Output Voltage
| |
Optimized system with different input voltages
Boost Diode Short-Circuit Protection
| |
Enhanced protection features
Adjustable PFC Disable Threshold Based on Output Power
| |
Optimized system to improve efficiency
Frequency Foldback with Minimum Frequency Clamp
| |
Enhanced efficiency at light and no load
Minimum Frequency Clamp
| |
Eliminates audible noise
Valley Switching Operation with Valley-Lockout
| |
Noise free operation
**PFC******
| |
**QR Flyback Controller******
| |

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