Datasheet > NCP1249C

NCP1249C

更新时间： 2024-09-19 01:10:59

品牌	Logo	应用领域
安森美 - ONSEMI		/
页数	文件大小	规格书
33页	1074K
描述
High-Voltage CurrentMode PWM Controller Featuring Peak Power Excursion

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NCP1249C 数据手册

NCP1249C, NCP1249D

High-Voltage CurrentMode

PWM Controller Featuring

Peak Power Excursion and

Self-Relaxing Off Mode

The NCP1249 is a highly integrated high−voltage PWM controller

capable of delivering a rugged and high performance offline power

supply with extremely low no−load consumption. With a supply range

up to 30 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.

To help build rugged converters, the controller features several key

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

Power Protection for a constant maximum output current regardless of

the input voltage and two latched over voltage protection inputs −

either through a dedicated pin or via the VCC input.

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).

http://onsemi.com

MARKING DIAGRAM

NCP1249x65

SOIC−9 NB

D SUFFIX

CASE 751BP

ALYW

XXXXX = Specific Device Code

= Assembly Location

= Wafer Lot

= Year

= Work Week

= Pb−Free Package

PIN CONNECTIONS

FB/REM

OPP/Latch

Timer

DRV

GND

Features

(Top View)

• High−Voltage Current Source for Lossless Start−up Sequence

• Automatic and Lossless X2 Capacitors Discharge Function

• 65 kHz Fixed−Frequency Current−Mode Control Operation with

130 kHz Excursion

• Internal and Adjustable Over Power Protection (OPP)

Circuit

• Up to 30 V VCC Maximum Rating

• +300 mA/ −500 mA Source/Sink Drive Capability

• Extremely Low No−Load Standby Power via

Controlled Self−Relaxing Off Mode

• Option for Auto−Recovery or Latched Short−Circuit

Protection

• Internal Thermal Shutdown with Hysteresis

• These are Pb−Free Devices

• Internal Brown−Out Protection Circuit

• Frequency Foldback Down to 26 kHz and Skip−Cycle

in Light Load Conditions

• Adjustable Ramp Compensation

• Internally Fixed 4 ms Soft−Start

• Adjustable Timer-Based Auto−Recovery

Overload/Short−Circuit Protection

• 100% to 25% Timer Reduction from Overload to

Short−Circuit Fault

Typical Applications

• Converters Requiring Peak−power Capability such as

Printers Power Supplies, ac−dc Adapters for Game

Stations

• Frequency Jittering in Normal and Frequency Foldback

Modes

• Latched OVP Input for Improved Robustness and

Latched OVP on VCC

ORDERING INFORMATION

See detailed ordering and shipping information on page 2 of

this data sheet.

Publication Order Number:

September, 2013 − Rev. 0

NCP1249C/D

12 3 4 5 6 7...33

中文翻译

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与NCP1249C相关器件

型号	品牌	获取价格	描述	数据表
NCP1249CD65R2G	ONSEMI	获取价格	High-Voltage CurrentMode PWM Controller Featuring Peak Power Excursion
NCP1249DD65R2G	ONSEMI	获取价格	High-Voltage CurrentMode PWM Controller Featuring Peak Power Excursion
NCP1250	ONSEMI	获取价格	Current-Mode PWM Controller for Off-line Power Supplies
NCP1250_11	ONSEMI	获取价格	Current-Mode PWM Controller for Off-line Power Supplies
NCP1250ASN100T1G	ONSEMI	获取价格	Current-Mode PWM Controller for Off-line Power Supplies
NCP1250ASN65T1G	ONSEMI	获取价格	Current-Mode PWM Controller for Off-line Power Supplies
NCP1250BP65G	ONSEMI	获取价格	PWM 控制器，电流模式，用于离线电源
NCP1250BSN100T1G	ONSEMI	获取价格	Current-Mode PWM Controller for Off-line Power Supplies
NCP1250BSN65T1G	ONSEMI	获取价格	Current-Mode PWM Controller for Off-line Power Supplies
NCP1251	ONSEMI	获取价格	Current-Mode PWM Controller for Off-line Power Supplies

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