Name: PWM Controller, Current Mode, for Offline Power Supplies
Brand: PWM Controller, Current Mode, for Offline Power Supplies
SKU: NCP1254

PWM Controller, Current Mode, for Offline Power Supplies

Obsolete

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The NCP1254 is a highly integrated PWM controller capable of delivering a rugged and high performance offline power supply in a TSOP-6 package. With a supply range up to 35 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.
To help building rugged converters, the controller features several key protective features: a non-dissipative Over Power Protection for a constant maximum output current regardless of the input voltage, two latched over voltage protection inputs - either through a dedicated pin or via the Vcc input and a dual-level auto-recover/latched overload/short-circuit timer.
The controller architecture is designed to authorize a transient peak power excursion when the current setpoint hits the limit. At this point, the switching frequency is increased form 65 kHz to 130 kHz until the peak event disappears. The timer duration is then modulated as the converter crosses a peak power excursion mode (long) or undergoes a short circuit (short).

Ac-Dc adapters

Printer Power Supplies
Notebook Adapters

65kHz Fixed Frequency Current Mode control with 130 kHz frequency excursion
Internal and adjustable Over Power Protection (OPP) circuit
Frequency Foldback down to 26 kHz and Skip-cycle in light load conditions
Timer-based Auto-recovery Overload/Short-circuit protection with 100% to 25% timer reduction for short-circuit faults
Frequency Jittering in Normal and Frequency Foldback Modes
Latch Input
Double Vcc hiccup in fault mode

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NCP1254ASN65T1G

Obsolete

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Offline Controllers | NCP1254

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