توضیحات
ايسي NCP1015 که شامل مدار داخلي مولد فرکانس ثابت براي کنترل جريان با يک ماسفت 700 ولت داخلي که در پکيج هاي PDIP7 يا SOT223 توليد ميشود.اين ايسي شامل تمام چيزهاي ضروري براي ساخت يک منبع تغذيه با قابليت سافت استارت و Frequency jittering و محافظ اتصال کوتاه ميباشد.
**کاربرد ها :
*منبع تغذيه هاي متناوب يا مستقيم براي شارژ
*منبع تغذيه دستگاه ها از قبيل USB و ...
Description
Self-Supplied Monolithic
Switcher for Low StandbyPower Offline SMPS
The NCP1015 integrates a fixed frequency current mode
controller and a 700 V voltage MOSFET. Housed in a PDIP7 or
SOT223 package, the NCP1015 offers everything needed to build a
rugged and low cost power supply, including soft start, frequency
jittering, short circuit protection, skip cycle, a maximum peak
current set point and a Dynamic Self Supply (no need for an auxiliary
winding).
Unlike other monolithic solutions, the NCP1015 is quiet by nature:
during nominal load operation, the part switches at one of the available
frequencies (65?100 kHz). When the current set point falls below a
given value, e.g. the output power demand diminishes, the IC
automatically enters the so called skip cycle mode and provides
excellent efficiency at light loads. Because this occurs at typically 0.25
of the maximum peak value, no acoustic noise takes place. As a result,
standby power is reduced to the minimum without acoustic noise
generation.
Short circuit detection takes place when the feedback signal fades
away e.g. un true short circuit or is broken optocoupler cases. Finally
soft start and frequency jittering further ease the designer task to
quickly develop low cost and robust offline power supplies.
For improved standby performance, the connection of an auxiliary
winding stops the DSS operation and helps to consume less than
100 mW at high line.
Features
• Built in 700 V MOSFET with typical RDS(on) of 11
• Large Creepage Distance between High?voltage Pins
• Current mode Fixed Frequency Operation: 65 kHz 100 kHz
• Skip cycle Operation at Low Peak Currents Only: No Acoustic Noise!
• Dynamic Self?Supply, No Need for an Auxiliary Winding
• Internal 1 ms Soft start
• Auto recovery Internal Output Short circuit Protection
• Frequency Jittering for Better EMI Signature
• Below 100 mW Standby Power if Auxiliary Winding is Used
• Internal Temperature Shutdown
• Direct Optocoupler Connection
• SPICE Models Available for TRANsient and AC Analysis
• This is a Pb Free Device
Typical Applications
• Low Power ac dc Adapters for Chargers
• Auxiliary Power Supplies (USB, Appliances, TVs, etc.)
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