NCP1605FORWGEVB【PDF 1/19 页】EVAL BOARD FOR NCP1605FORWG

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NCP1217, NCP1217A

Enhanced PWM Current--Mode

Controller for High--Power

Universal Off--Line Supplies

Housed in an SO--8 or PDIP--7 package, the NCP1217 represents

the enhanced version of the NCP1203--based controllers. Due to its

high drive capability, NCP1217 drives large gate--charge MOSFETs,

which together with internal ramp compensation and built--in

overvoltage protection, ease the design of modern AC/DC adapters.

NCP1217 offers a true alternative to UC384X--based designs.

With an internal structure operating at different fixed frequencies

(65–100–133 kHz), the controller features a high--voltage startup FET,

which ensures a clean and loss less startup sequence. Its current--mode

control topology provides an excellent input audio--susceptibility and

inherent pulse--by--pulse control. Internal ramp compensation easily

prevents subharmonic oscillations from taking place in continuous

conduction mode designs.

When the current setpoint falls below a given value, e.g. the output

power demand diminishes, the IC automatically enters the so--called

skip cycle mode and provides excellent efficiency at light loads.

Because this occurs at a user adjustable low peak current, no acoustic

noise takes place.

The NCP1217 features two efficient protective circuitries: 1) In

presence of an overcurrent condition, the output pulses are disabled

and the device enters a safe burst mode, trying to restart. Once the

default has gone, the device auto--recovers. 2) If an external signal

(e.g. a temperature sensor) pulls Pin 1 above 3.2 V, output pulses are

immediately stopped and the NCP1217 stays latched in this position.

Reset occurs when the V CC collapses to ground, e.g. the user unplugs

the power supply.

Features

Current--Mode with Adjustable Skip--Cycle Capability

Built--in Internal Ramp Compensation

Auto--Recovery Internal Output Short--Circuit Protection

Internal 1.0 ms Soft--Start (NCP1217A Only)

http://onsemi.com

MARKING

DIAGRAMS

SOIC--8 17xxx

D1, D2 SUFFIX ALYW

CASE 751 G

PDIP--8 P1217xxxx

N SUFFIX AWL

CASE 626 YYWWG

xxxx = Specific Device Code

A = Assembly Location

L, WL = Wafer Lot

Y, YY = Year

W, WW = Work Week

G or G

Pb--Free Package

PIN CONNECTIONS

Adj 1 8 HV

Limited Duty--Cycle to 50% (NCP1217A Only)

FB 2

Full Latchoff if Adjustment Pin is Brought High

Extremely Low No--Load Standby Power

Internal Temperature Shutdown

500 mA Peak Current Capability

Fixed Frequency Versions at 65 kHz, 100 kHz and 133 kHz

Direct Optocoupler Connection

Internal Leading Edge Blanking

SPICE Models Available for TRANsient and AC Analysis

These are Pb--Free Devices

CS 3 6 V CC

GND 4 5 Drv

(Top View)

DEVICE MARKING INFORMATION

See detailed device marking information in the ordering

information section on page 17 of this data sheet.

ORDERING INFORMATION

Typical Applications

? High Power AC/DC Converters for TVs, Set--Top Boxes, etc.

? Offline Adapters for Notebooks

? Telecom DC--DC Converters

? All Power Supplies

See detailed ordering and shipping information in the ordering

information section on page 17 of this data sheet.

? Semiconductor Components Industries, LLC, 2010

December, 2010 -- Rev. 7

Publication Order Number:

NCP1217/D

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