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NCP1234_16

更新时间： 2024-11-30 01:04:43
品牌 Logo 应用领域
安森美 - ONSEMI /
页数 文件大小 规格书
33页 231K
描述
Fixed Frequency Current Mode Controller for Flyback Converters

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NCP1234_16 数据手册

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NCP1234  
Fixed Frequency Current  
Mode Controller for Flyback  
Converters  
The 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.  
www.onsemi.com  
The DSS function greatly simplifies the design of the auxiliary  
supply and the V capacitor by activating the internal startup current  
CC  
source to supply the controller during transients.  
SOIC−7  
CASE 751U  
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 components cost is the key  
constraints.  
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.  
MARKING DIAGRAM  
8
34Xff  
ALYWX  
G
1
34Xff = Specific Device Code  
X = A or B  
Finally, due to a careful design, the precision of critical parameters  
is well controlled over the entire temperature range (−40°C to  
+125°C).  
ff = 65 or 100  
= Assembly Location  
= Wafer Lot  
= Year  
= Work Week  
= Pb−Free Package  
A
L
Y
W
G
Features  
• Fixed−Frequency Current−Mode Operation with Built−In Ramp  
Compensation  
PIN CONNECTIONS  
• 65 kHz or 100 kHz Oscillator Frequency version  
• Frequency Foldback then Skip Mode for Maximized Performance in  
Light Load and Standby Conditions  
Latch  
FB  
1
2
3
4
8
HV  
• Timer−Based Overload Protection with Latched (option A) or  
Auto−Recovery (option B) Operation  
V
CC  
CS  
6
5
GND  
DRV  
• High−voltage Current Source with Dynamic Self−Supply,  
(Top View)  
Simplifying the Design of the V Capacitor  
CC  
• Frequency Modulation for Softened EMI Signature, including during  
Frequency Foldback mode  
ORDERING INFORMATION  
See detailed ordering and shipping information in the package  
dimensions section on page 32 of this data sheet.  
• Adjustable Overpower Compensation  
• Latch−off Input for Severe Fault Conditions, Allowing Direct  
Connection of an NTC for Overtemperature Protection (OTP)  
• V Operation up to 28 V, with Overvoltage Detection  
CC  
•
500 mA Peak Source/Sink Current Drive Capability  
• 4.0 ms Soft−Start  
Typical Applications  
• Internal Thermal Shutdown  
• Pin−to−Pin Compatible with the Existing NCP12xx  
• AC−DC Adapters for Notebooks, LCD, and Printers  
• Offline Battery Chargers  
• Consumer Electronic Power Supplies  
• Auxiliary/Housekeeping Power Supplies  
Series  
• These Devices are Pb−Free, Halogen Free/BFR Free  
and are RoHS Compliant  
© Semiconductor Components Industries, LLC, 2016  
1
Publication Order Number:  
January, 2016 − Rev. 2  
NCP1234/D  
1234567...33

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