Datasheet > NCP1254

NCP1254

更新时间： 2024-09-18 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
25页	376K
描述
Current-Mode PWM Controller for Off-line Power Supplies featuring Peak Power Excursion

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NCP1254 数据手册

NCP1254

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Current-Mode PWM

Controller for Off-line

Power Supplies featuring

Peak Power Excursion

http://onsemi.com

The NCP1254 is a highly integrated PWM controller capable of

delivering a rugged and high performance offline power supply in a

TSOP−6 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.

TSOP−6

CASE 318G

STYLE 13

To help building rugged converters, the controller features several

key protective features: a non−dissipative Over Power Protection for a

constant maximum output current regardless of the input voltage, two

latched over voltage protection inputs − either through a dedicated pin

MARKING DIAGRAM

54xAYWG

or via the V input and a dual−level auto−recovery/latched overload/

short−circuit timer.

The controller architecture is designed to authorize a transient peak

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

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

peak event disappears. The timer duration is then modulated as the

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

short circuit (short).

= Specific Device Code

= A or B

= Assembly Location

= Year

= Work Week

= Pb−Free Package

(Note: Microdot may be in either location)

Features

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

130−kHz Excursion

PIN CONNECTIONS

• Internal and Adjustable Over Power Protection (OPP) Circuit

GND

DRV

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

Conditions

• Adjustable Slope Compensation

• Internally Fixed 4−ms Soft−start

OPP/Latch

• Fixed Timer−based Auto−recovery Overload/Short−circuit Protection

(Top View)

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

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

ORDERING INFORMATION

See detailed ordering and shipping information in the package

dimensions section on page 2 of this data sheet.

• 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.

This document contains information on a product under development. ON Semiconductor

reserves the right to change or discontinue this product without notice.

Publication Order Number:

March, 2013 − Rev. P1

NCP1254/D

12 3 4 5 6 7...25

中文翻译

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与NCP1254相关器件

型号	品牌	获取价格	描述	数据表
NCP1254ASN65T1G	ONSEMI	获取价格	Current-Mode PWM Controller for Off-line Power Supplies featuring Peak Power Excursion
NCP1254BSN65T1G	ONSEMI	获取价格	Current-Mode PWM Controller for Off-line Power Supplies featuring Peak Power Excursion
NCP1255	ONSEMI	获取价格	Current-Mode PWM Controller for Off-line Power Supplies featuring Peak Power Excursion
NCP1255_13	ONSEMI	获取价格	Current-Mode PWM Controller for Off-line Power Supplies featuring Peak Power Excursion
NCP1255AD65R2G	ONSEMI	获取价格	Current-Mode PWM Controller for Off-line Power Supplies featuring Peak Power Excursion
NCP1255ASN65T1G	ONSEMI	获取价格	IC SWITCHING CONTROLLER, Switching Regulator or Controller
NCP1255BD65R2G	ONSEMI	获取价格	Current-Mode PWM Controller for Off-line Power Supplies featuring Peak Power Excursion
NCP1255CD65R2G	ONSEMI	获取价格	Current-Mode PWM Controller for Off-line Power Supplies featuring Peak Power Excursion
NCP1255DD65R2G	ONSEMI	获取价格	Current-Mode PWM Controller for Off-line Power Supplies featuring Peak Power Excursion
NCP1256	ONSEMI	获取价格	Low Power Offline PWM Current Mode Controller

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