Datasheet > NCP1239_15

NCP1239_15

更新时间： 2024-12-01 00:57:11

品牌	Logo	应用领域
安森美 - ONSEMI		/
页数	文件大小	规格书
25页	240K
描述
Fixed Frequency CurrentâMode Controller for Flyback Converter

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中文翻译

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NCP1239_15 数据手册

NCP1239

Fixed Frequency

Current‐Mode Controller for

Flyback Converter

The NCP1239 is a fixed-frequency current-mode controller

featuring a high-voltage start-up current source to provide a quick and

lossless power-on sequence. This function greatly simplifies the

www.onsemi.com

design of the auxiliary supply and the V capacitor by activating the

internal start-up current source to supply the controller during start-up,

transients, latch, stand-by etc.

SOIC−7

CASE 751U

With a supply range up to 35 V, the controller hosts a jittered 65 or

100-kHz switching circuitry operated in peak current mode control.

When the power on the secondary side starts to decrease, the controller

automatically folds back its switching frequency down to minimum

level of 26 kHz. As the power further goes down, the part enters skip

cycle while limiting the peak current that insures excellent efficiency

in light load condition.

NCP1239 features a timer-based fault detection circuitry that

ensures a quasi-flat overload detection, independent of the input

voltage.

PIN CONNECTIONS

Fault

VCC

DRV

GND

Features

• Fixed-Frequency 65-kHz or 100-kHz Current-Mode Control

Operation

• Frequency Foldback Down to 26 kHz and Skip Mode to

Maximize Performance in Light Load Conditions

• Adjustable Over Power Protection (OPP) Circuit

MARKING DIAGRAM

1239xfff

ALYWX

• High-Voltage Current Source with Brown-Out (BO) Detection

• Internal Slope Compensation

• Internal Fixed 8-ms Soft-Start

• Frequency Jittering in Normal and Frequency Foldback Modes

• 64-ms Timer-Based Short-Circuit Protection with Auto-Recovery

1239xfff = Specific Device Code

x = A, B, C, D or E

or Latched Operation

• Pre-Short Ready for Latched OCP Versions

fff = 065 or 100

= Assembly Location

= Wafer Lot

= Year

= Work Week

= Pb−Free Package

• Latched OVP on V (NCP1239 A, B, D or E Versions)

• Latched OVP/OTP Input for Improved Robustness

• 35-V V Operation

•

500 mA Peak Source/Sink Drive Capability

• Internal Thermal Shutdown

ORDERING INFORMATION

• Extremely Low No-Load Standby Power

See detailed ordering and shipping information on page 24 of

this data sheet.

• Pin-to-Pin Compatible with the Existing NCP1236/1247 Series

• These Devices are Pb-Free and are RoHS Compliant

Typical Applications

• AC-DC Converters for TVs, Set-Top Boxes and Printers

• Offline Adapters for Notebooks and Netbooks

Publication Order Number

November, 2015 − Rev. 9

NCP1239/D

12 3 4 5 6 7...25

中文翻译

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