NCP1288 查看數據表（PDF） - ON Semiconductor

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NCP1288

Fixed Frequency Current Mode Controller for Flyback Converters

ON Semiconductor 

NCP1288

Fixed Frequency Current

Mode Controller for Flyback

Converters

The NCP1288 is a new generation of the NCP12xx fixed−frequency

current−mode controllers featuring a high−voltage startup current,

http://onsemi.com

pin−to−pin compatible with the previous generation.

Due to its proprietary Soft−Skip™ mode combined with frequency

foldback, the controller exhibits excellent efficiency in light load

condition while still achieving very low standby power consumption.

This Soft−Skip feature also dramatically reduces the risk of acoustic

noise, which enables the use of inexpensive transformers and

capacitors in the clamping network.

Internal frequency jittering, ramp compensation, and a versatile

SOIC−7

CASE 751U

MARKING

DIAGRAM

8

88Xff

ALYWX

G

1

latch input make this controller an excellent candidate for converters

where ruggedness and components cost are the key constraints.

In addition, the controller includes a new high voltage circuitry that

combines a startup current source and a brown−out / line OVP detector

able to sense the input voltage either from the rectified ac line or the dc

filtered bulk voltage.

Finally, due to a careful design, the precision of critical parameters

is well controlled over the entire temperature range (−40°C to

88Xff = Specific Device Code

X = A or B

ff = 65, 00, or 33

A = Assembly Location

L = Wafer Lot

Y = Year

W = Work Week

G = Pb−Free Package

+125°C), enabling easier design and increased safety (e.g. $5% for

the peak current limit, $7% for the oscillator).

Features

ORDERING INFORMATION

See detailed ordering and shipping information in the package

dimensions section on page 38 of this data sheet.

• Timer−Based Overload Protections with Auto−

Recovery (Option B) or Latched (Option A) Operation

• High−Voltage Current Source with Built−in Brown−out

• VCC Operation up to 28 V

• Increased Precision on Critical Parameters

• ±1.0 A Peak Drive Capability

and Line Overvoltage Protections

• Fixed−Frequency Current−Mode Operation with

Built−in Ramp Compensation

• Frequency Jittering for a Reduced EMI Signature

• Adjustable Overpower Compensation

• 4.0 ms Soft−Start

• Internal Thermal Shutdown with Hysteresis

• These Devices are Pb−Free, Halogen Free/BFR Free

and are RoHS Compliant*

• Latch−off Input for Severe Fault Conditions, with

Direct Connection of an NTC for Overtemperature

Typical Applications

• ac−dc Adapters for Notebooks, LCD, and Printers

Protection (OTP)

• Protection Against Winding Short−Circuit

• Frequency Foldback transitioning into Soft−Skip for

Improved Performance in Standby

• Offline Battery Chargers

• Consumer Electronic Power Supplies

• Auxiliary/Housekeeping Power Supplies

• 65 kHz Oscillator (100 kHz and 133 kHz Versions

Available Upon Request)

*For additional information on our Pb−Free strategy and soldering details, please

download the ON Semiconductor Soldering and Mounting Techniques

Reference Manual, SOLDERRM/D.

© Semiconductor Components Industries, LLC, 2011

1

July, 2011 − Rev. 3

Publication Order Number:

NCP1288/D

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