Datasheet > NCP1937A2DR2G

NCP1937A2DR2G

更新时间： 2024-11-08 00:54:23

品牌	Logo	应用领域
安森美 - ONSEMI		/
页数	文件大小	规格书
38页	970K
描述
Combination Power Factor Correction and Quasi-Resonant Flyback Controllers for Adapters

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NCP1937A2DR2G 数据手册

NCP1937

Combination Power Factor

Correction and Quasi-

Resonant Flyback

Controllers for Adapters

www.onsemi.com

MARKING DIAGRAM

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.

HV/X2

BO/X2

PFBHV

PFBLV

GND

PControl

PONOFF

QCT

PCS/PZCD

PDRV

QDRV

QCS

SOIC−20

Narrow Body

CASE 751BS

Fault

PSTimer

QFB

VCC

The quasi−resonant current−mode flyback stage features a

proprietary valley−lockout circuitry, ensuring stable valley switching.

QZCD

NCP1937 = Specific Device Code

This system works down to the 4 valley and toggles to a frequency

= A1, A2, A3, B1, B2, B3, C1, C4 or C61

= Assembly Location

= Wafer Lot

= Year

= Work Week

foldback mode with a minimum frequency clamp beyond the 4

valley to eliminate audible noise. Skip mode operation allows

excellent efficiency in light load conditions while consuming very low

standby power consumption.

= Pb−Free Package

Common General Features

• Wide V Range from 9 V to 30 V with Built−in Overvoltage

Protection

ORDERING INFORMATION

See detailed ordering and shipping information on page 5 of

this data sheet.

• High−Voltage Startup Circuit and Active Input Filter Capacitor

Discharge Circuitry for Reduced Standby Power

• Integrated High−Voltage Brown−Out Detector

• Integrated High−Voltage Switch Disconnects PFC Feedback Resistor

Divider to Reduce Standby Power

• Fault Input for Severe Fault Conditions, NTC

Compatible (Latch and Auto−Recovery Options)

• 0.5 A / 0.8 A Source / Sink Gate Drivers

• Feed−Forward for Improved Operation across Line and

Load

• Adjustable PFC Disable Threshold Based on Output

Power

• Internal Temperature Shutdown

• Power Savings Mode Reduces Supply Current

Consumption to 70 mA Enabling Very Low Input Power

Applications

QR Flyback Controller Features

• Valley Switching Operation with Valley−Lockout for

Noise−Free Operation

• Frequency Foldback with Minimum Frequency Clamp

for Highest Performance in Standby Mode

• Minimum Frequency Clamp Eliminates Audible Noise

PFC Controller Features

• Critical Conduction Mode with Constant On Time

Control (Voltage Mode) and Maximum Frequency

Clamp

• Timer−Based Overload Protection (Latched or

• Accurate Overvoltage Protection

Auto−Recovery options)

• Adjustable Overpower Protection

• Winding and Output Diode Short−Circuit Protection

• 4 ms Soft−Start Timer

• Bi−Level Line−Dependent Output Voltage

• Fast Line / Load Transient Compensation

• Boost Diode Short−Circuit Protection

Publication Order Number:

June, 2015 − Rev. 4

NCP1937/D

12 3 4 5 6 7...38

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