NCP1244 Series

Controller, Fixed Frequency, Current Mode, for Flyback Converters

Catalog

Controller, Fixed Frequency, Current Mode, for Flyback Converters

Part	Operating Temperature [Max]	Operating Temperature [Min]	Voltage - Start Up	Package / Case [custom]	Package / Case	Package / Case [custom]	Package / Case	Fault Protection	Topology	Supplier Device Package	Internal Switch(s)	Frequency - Switching	Output Isolation	Voltage - Supply (Vcc/Vdd) [Min]	Voltage - Supply (Vcc/Vdd) [Max]	Mounting Type	Duty Cycle
ON Semiconductor NCP1244BD065R2G	150 °C	-40 °C	12 V	7	8-SOIC	3.9 mm	0.154 in	Current Limiting Over Load Over Power Over Temperature Over Voltage	Flyback	7-SOIC		65 kHz	Isolated	8.9 V	28 V	Surface Mount	80 %
ON Semiconductor NCP1244AD065R2G	150 °C	-40 °C	12 V	7	8-SOIC	3.9 mm	0.154 in	Current Limiting Over Load Over Power Over Temperature Over Voltage	Flyback	7-SOIC		65 kHz	Isolated	8.9 V	28 V	Surface Mount	80 %

Catalog

Controller, Fixed Frequency, Current Mode, for Flyback Converters

Key Features

• Frequency Foldback and Skip Mode

• Timer-Based Overload Protection with Latched (Option A) or Auto-Recovery (Option B) operation

• High voltage current source with Dynamic Self Supply (DSS)

• Internal Frequency Jittering

• Adjustable overpower protection

• Dedicated latch off input

• Integrated X2 capacitor discharge

• Power saving off mode when used with NCP4353 or NCP4354

Description

The NCP1244 is a new fixed-frequency current-mode controller featuring 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. This device contains a special HV dtector which detects the application unplug from the AC input line and triggers the X2 discharge current.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.Due to frequency foldback, the controller exhibits excellent efficiency in light load condition while still achieveing very low standby power consumption. Internal frequency jittering, ramp compensation, and a versatile latch input make this controller an excellent candidate for the robust power supply designs.A dedicated OFF mode allows to reach the extremely low no load input power consumption via sleeping whole device and thus minimze the power consumption of the control circuitry.This product is IEC60950 compliant. Please see the test report and certification in the Conformance report section below.