NCP1254: Current-Mode PWM Controller

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).

技术特性

65−kHz Fixed−frequency Current−mode Control Operation with
130−kHz Excursion
Internal and Adjustable Over Power Protection (OPP) Circuit
Frequency Foldback down to 26 kHz and Skip−cycle in Light Load
Conditions
Adjustable Slope Compensation
Internally Fixed 4−ms Soft−start
Fixed Timer−based Auto−recovery Overload/Short−circuit Protection
100% to 25% Timer Reduction from Overload to Short−circuit Fault
Double Vcc Hiccup for a Reduced Average Power in Fault Mode
Frequency Jittering in Normal and Frequency Foldback Modes
Latched OVP Input for Improved Robustness and Latched OVP on Vcc
Up to 35−V Vcc Maximum Rating
Extremely Low No−load Standby Power
This is a Pb−Free Device

应用

Ac-Dc adapters

终端产品

Printer Power Supplies
Notebook Adapters

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类型

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NCP1254ASN65T1G

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Pb-free

Halide free

Current-Mode PWM Controller

TSOP-6

318G-02

Tape and Reel

3000

NCP1254BSN65T1G