Current-Mode PWM Controller
Description
NCP1254
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Current-Mode PWM
Controller for Off-line
Power Supplies featuring
Peak Power Excursion
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−recovery/latched overl...
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