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NCP1239JD65R2G

Fixed Frequency Current Mode Controller for Flyback Converter with HV startup

Manufacturer:

ON Semiconductor, LLC
Mfr.Part #:

NCP1239JD65R2G
Datasheet:

NCP1239JD65R2G Datasheet (PDF)
Case Outline:

751U
MSL Temp (°C):

260
Container Type:

REEL
EDA/CAD Models:

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NCP1239JD65R2G General Description

The NCP1239 is a fixed-frequency current-mode controller featuring the Dynamic Self-Supply. This 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 start-up, transients, latch, stand-by etc. With a supply range up to 35 V, the controller hosts a jittered 65 or 100-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 minimum level of 26 kHz. As the power further goes down, the part enters skip cycle while limiting the peak current that insures excellent efficiency in light load condition. It features a timer-based fault detection that ensures the detection of overload and an adjustable compensation to help keep the maximum power independent of the input voltage.

Key Features

Fixed-frequency 65-kHz or 100-kHz current-mode control operation
Frequency foldback down to 26 kHz and skip mode
Adjustable Over Power Protection (OPP) circuit
High-voltage Current Source with Brown-out (BO) detection
Internal ramp compensation
Internal fixed 8-ms soft-start
Frequency jittering in normal and frequency foldback modes
64-ms timer-based short-circuit protection with auto-recovery or latched operation
Pre-short ready
Latched OVP on Vcc (NCP1239 A & B versions)
Latched OVP/OTP input for improved robustness
35-V Vcc operation
+500 mA/ -500 mA peak source/sink drive capability
Internal thermal shutdown
Extremely low no-load standby power
Pin-to-pin compatible with the existing NCP1236/1247 series