Datasheet > NCP1255BD65R2G

NCP1255BD65R2G

更新时间： 2024-11-08 12:02:43

品牌	Logo	应用领域
安森美 - ONSEMI		控制器
页数	文件大小	规格书
28页	435K
描述
Current-Mode PWM Controller for Off-line Power Supplies featuring Peak Power Excursion

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NCP1255BD65R2G 数据手册

NCP1255

Current-Mode PWM

Controller for Off-line

Power Supplies featuring

Peak Power Excursion

The NCP1255 is a highly integrated PWM controller capable of

delivering a rugged and high performance offline power supply in a

SOIC−8 package. With a supply range up to 35 V, the controller hosts a

jittered 65−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 a

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

enters skip cycle while freezing the peak current setpoint.

http://onsemi.com

SOIC−8

D1, D2 SUFFIX

CASE 751

To help build rugged converters, the controller features several key

protective features: a brown−out, a non−dissipative Over Power

Protection for a constant maximum output current regardless of the

input voltage, two latched over voltage protection inputs − either

MARKING DIAGRAM

1255x65

ALYW

through a dedicated pin or via the V input − and finally, the

possibility to externally adjust an auto−recovery timer duration.

The controller architecture is arranged to authorize a transient peak

power excursion when the peak current hits the limit. At this point, the

switching frequency is increased from 65 kHz to 130 kHz until the

peak requirement disappears. The timer duration is then modulated as

the converter crosses a peak power excursion mode (long) or

undergoes a short circuit (short).

1255x65 = Specific Device Code

x = A, B, C or D

= Assembly Location

= Wafer Lot

= Year

= Work Week

= Pb−Free Package

Features

• 65−kHz Fixed−frequency Current−mode Control Operation with

130−kHz Excursion

(Note: Microdot may be in either location)

• Internal and Adjustable Over Power Protection (OPP) Circuit

PIN CONNECTIONS

• Adjustable Brown−Out Protection Circuit

• Frequency Foldback down to 26 kHz and Skip−cycle in Light Load

OPP/Latch

Timer

Conditions

• Adjustable Slope Compensation

• Internally Fixed 4−ms Soft−start

Vcc

GND

DRV

• Adjustable Timer−based Auto−recovery Overload/Short−circuit

(Top View)

Protection

• 100% to 25% Timer Reduction from Overload to Short−circuit Fault

ORDERING INFORMATION

See detailed ordering and shipping information in the package

dimensions section on page 2 of this data sheet.

• Double V Hiccup for a Reduced Average Power in Fault Mode

• Frequency Jittering in Normal and Frequency Foldback Modes

• Latched OVP Input for Improved Robustness and Latched OVP on V

• Up to 35−V V Maximum Rating

• Extremely Low No−load Standby Power

• This is a Pb−Free Device

Typical Applications

• Converters requiring peak−power capability such as printers power

supplies, ac−dc adapters for game stations.

Publication Order Number:

June, 2013 − Rev. 1

NCP1255/D

12 3 4 5 6 7...28

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