Datasheet > NCP1237_11

NCP1237_11

更新时间： 2024-11-30 12:24:59

品牌	Logo	应用领域
安森美 - ONSEMI		转换器控制器
页数	文件大小	规格书
41页	280K
描述
Fixed Frequency Current Mode Controller for Flyback Converters

阅读下载

中文翻译

获取价格

数据手册

如果您发现信息不准确，欢迎纠错

NCP1237_11 数据手册

NCP1237

Fixed Frequency Current

Mode Controller for Flyback

Converters

The NCP1237 is a new generation of the NCP12xx fixed−frequency

current−mode controllers featuring Dynamic Self−Supply (DSS),

pin−to−pincompatible with the previous generation.

http://onsemi.com

MARKING

The DSS function greatly simplifies the design of the auxiliary supply

and the V capacitor by activating the internal startup current source to

DIAGRAM

supply the controller during transients.

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.

The NCP1237 features a dual−level timer−based fault detection that

controls the amount of transient peak power that the controller can

deliver for a limited time.

Internal frequency jittering, ramp compensation, and a versatile

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.

37Xff

ALYWX

SOIC−7

CASE 751U

37Xff = Specific Device Code

X = A or B

ff = 65, 00, or 33

= Assembly Location

= Wafer Lot

= Year

= Work Week

= Pb−Free Package

ORDERING INFORMATION

See detailed ordering and shipping information in the package

dimensions section on page 40 of this data sheet.

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

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

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

peak current limit, 7% for the oscillator).

Features

• Timer−Based Transient Power and Overload

Protections with Auto−Recovery (Option B) or Latched

(Option A) Operation

• High−Voltage Current Source with DSS with Built−in

Brown−out and Line Overvoltage Protections

• Fixed−Frequency Current−Mode Operation with

Built−in Ramp Compensation

• Frequency Jittering for a Reduced EMI Signature

• Adjustable Overpower Compensation

• Latch−off Input for Severe Fault Conditions, with

Direct Connection of an NTC for Overtemperature

Protection (OTP)

• 65 kHz Oscillator (100 kHz and 133 kHz Versions

Available Upon Request)

• V Operation up to 28 V

• Increased Precision on Critical Parameters

•

1.0 A Peak Drive Capability

• 4.0 ms Soft−Start

• Internal Thermal Shutdown with Hysteresis

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

and are RoHS Compliant*

Typical Applications

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

• Offline Battery Chargers

• Consumer Electronic Power Supplies

• Auxiliary/Housekeeping Power Supplies

• Protection Against Winding Short−Circuit

• Frequency Foldback transitioning into Soft−Skip for

Improved Performance in Standby

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

download the ON Semiconductor Soldering and Mounting Techniques

Reference Manual, SOLDERRM/D.

Publication Order Number:

July, 2011 − Rev. 4

NCP1237/D

12 3 4 5 6 7...41

中文翻译

下载PDF

与NCP1237_11相关器件

型号	品牌	获取价格	描述	数据表
NCP1237AD65R2G	ONSEMI	获取价格	Fixed Frequency Current Mode Controller for Flyback Converters
NCP1237BD65R2G	ONSEMI	获取价格	Fixed Frequency Current Mode Controller for Flyback Converters
NCP1238	ONSEMI	获取价格	Fixed Frequency Current Mode Controller for Flyback Converters
NCP1238AD65R2G	ONSEMI	获取价格	Fixed Frequency Current Mode Controller for Flyback Converters
NCP1238BD65R2G	ONSEMI	获取价格	Fixed Frequency Current Mode Controller for Flyback Converters
NCP1239	ONSEMI	获取价格	Low−Standby High Performance PWM Controller
NCP1239_15	ONSEMI	获取价格	Fixed Frequency CurrentâMode Controller for
NCP1239_16	ONSEMI	获取价格	Fixed Frequency CurrentâMode Controller for
NCP1239A065	ONSEMI	获取价格	SWITCHING CONTROLLER
NCP1239A100	ONSEMI	获取价格	SWITCHING CONTROLLER

与NCP1237_11相关文章

解析光耦仿真器：升级光耦合器技术的必要性
2024-11-18

52
英伟达新一代Blackwell GPU过热问题致交付延迟
2024-11-18

41
国产厂商思特威CMOS图像传感器芯片单月出货超1亿颗，技术创新引领行业发展
2024-11-14

69
台积电5nm和3nm产能利用率达100%，半导体行业景气度持续攀升
2024-11-14

65

产品中心

服务支持

精选活动

关于我们

帮助中心

NCP1237_11

NCP1237_11 数据手册

与NCP1237_11相关器件

与NCP1237_11相关文章

您还可以找

产品中心

服务支持

精选活动

关于我们

帮助中心

NCP1237_11

NCP1237_11 数据手册

与NCP1237_11相关器件

与NCP1237_11相关文章

您还可以找

您在本页遇到什么问题？