Download the NCP1249D datasheet PDF.
This datasheet also covers the NCP1249C variant, as both devices belong to the same high-voltage current-mode pwm controller family and are provided as variant models within a single manufacturer datasheet.
General Description
When the voltage on this pin disappears, the controller ensures the
X2
capacitors discharge.
Connecting an opto-coupler to this pin allows regulation.
can pull the feedback pin down and brings the controller in a deep sleep mode.
Key Features
several key
9
1
SOIC.
9 NB D SUFFIX CASE 751BP
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NCP1249x65 ALYW G
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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.
Full PDF Text Transcription for NCP1249D (Reference)
Note: Below is a high-fidelity text extraction (approx. 800 characters) for
NCP1249D. For precise diagrams, and layout, please refer to the original PDF.
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 ...
View more extracted text
Relaxing Off Mode The NCP1249 is a highly integrated high−voltage PWM controller http://onsemi.com capable of delivering a rugged and high performance offline power supply with extremely low no−load consumption. With a supply range MARKING DIAGRAM 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.
NCP1249D Datasheet
