the ncp1230 represents a major leap towards achieving low
standby power in medium?to?high power switched?mode power
supplies such as notebook adapters, off?line battery chargersand
consumer electronics e housed in a compact 8?pinpackage
(soic?8, soic?7, or pdip?7), the ncp1230 contains all needed
control functionality to build a rugged and efficient power supply.the
ncp1230 is a current mode controller with internal ramp
compensation. among the unique features offered by the ncp1230is
an event management scheme that can disable the front?end pfc
circuit during standby, thus reducing the no load powerconsumption.
the ncp1230 itself goes into cycle skipping at light loadswhile
limiting peak current (to 25% of nominal peak) so that noacoustic
noise is generated. the ncp1230 has a high?voltage startupcircuit
that eliminates external components and reduces powerconsumption.
the ncp1230 also features an internal latching function that canbe
used for ovp protection. this latch is triggered by pulling the cspin
above 3.0 v and can only be reset by pulling vcc to ground.true
overload protection, internal 2.5 ms soft?start, internal leadingedge
blanking, internal frequency dithering for low emi are some ofthe
other important features offered by the ncp1230.
features
? current?mode operation with internal ramp compensation
? internal high?voltage startup current source for loss?lessstartup
? extremely low no?load standby power
? skip?cycle capability at low peak currents
? direct connection to pfc controller for improved no?loadstandby
power
? internal 2.5 ms soft?start
? internal leading edge blanking
? latched primary overcurrent and overvoltage protection
? short?circuit protection independent of auxiliary level
? internal frequency jittering for improved emi signature
? +500 ma/?800 ma peak current drive capability
? available in three frequency options: 65 khz, 100 khz, and 133khz
? direct optocoupler connection
? spice models available for transient and ac analysis
? this is a pb?free device
PFC 系列 ; PWM 系列 ; QR PWM 系列 ; 全系列MOSFET ; IGBT
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