NCP1254

PWM 控制器，電流模式，用于離線(xiàn)電源; 65kHz Fixed Frequency Current Mode control with 130 kHz frequency excursion\nAllows peak power delivery without growing the transformer size by temporarily increasing the switching frequency\nInternal and adjustable Over Power Protection (OPP) circuit\nCompensates peak current for changing line conditions\nFrequency Foldback down to 26 kHz and Skip-cycle in light load conditions\nOptimized efficiency across the entire power range\nTimer-based Auto-recovery Overload/Short-circuit protection with 100% to 25% timer reduction for short-circuit faults\nRobust protection against both overload and short circuit conditions\nFrequency Jittering in Normal and Frequency Foldback Modes\nSoftened EMI signature\nLatch Input\nFlexible input can be used for OVP or OTP protection\nDouble Vcc hiccup in fault mode\nReduced average power during fault mode\n;

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).

NCP1254

Current-Mode PWM Controller for Off-line Power Supplies featuring Peak Power Excursion

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NCP1254ASN65T1G

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