NCP1234

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Controller, Fixed Frequency, Current Mode, for Flyback Converters

制造商：ON

中文数据手册

产品信息

NCP1234 is a new fixed-frequency current-mode controller featuring Dynamic Self-Supply (DSS). This device is pin-to-pin compatible with the previous NCP12xx families.
The DSS function greatly simplifies the design of the auxiliary supply and the VCC capacitor by activating the internal startup current source to supply the controller during transients.
Due to frequency foldback, the controller exhibits excellent efficiency in light load condition while still achieving very low standby power consumption. Internal frequency jittering, ramp compensation, and a versatile latch input make this controller an excellent candidate for converters where component cost is the key constraint.
It features a timer-based fault detection that ensures the detection of overload independently of an auxiliary winding, and an adjustable compensation to help keep the maximum power independent of the input voltage.

Frequency Foldback then Skip Mode in light load and standby conditions
High voltage current source with brown-out detection and dynamic self-supply
Frequency Jittering
4.0 ms Soft-Start
Adjustable Overpower Compensation
Latched / Autorecovery Timer-Based Overload Protection

电路图、引脚图和封装图

NCP1234电路图
NCP1234电路图

在线购买

型号	制造商	描述	购买
NCP1234AD100R2G	ON	IC REG CTRLR FLYBACK PWM	立即购买
NCP1234BD100R2G	ON	IC REG CTRLR FLYBACK PWM 7SOIC	立即购买
NCP1234AD65R2G	ON	Converter Offline Flyback Topology 65kHz 7-SOIC	立即购买
NCP1234BD65R2G	ON	Converter Offline Flyback Topology 65kHz 7-SOIC	立即购买

技术资料

标题	类型	大小（KB）	下载
Fixed Frequency Current Mode Controller for Flyback Converters	PDF	225	点击下载
NCP1236: 65 W Off-Line Adapter	PDF	3072	点击下载
SOIC 7 CASE OUTLINE	PDF	60	点击下载
NCP1234_PO.JPG	UNKNOW	5	点击下载
NCP1234_PD.JPG	UNKNOW	16	点击下载
NCP1234_AD.JPG	UNKNOW	32	点击下载

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