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NCP1217 fiches techniques PDF

ON Semiconductor - Enhanced PWM Current-Mode Controller

Numéro de référence NCP1217
Description Enhanced PWM Current-Mode Controller
Fabricant ON Semiconductor 
Logo ON Semiconductor 





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NCP1217 fiche technique
NCP1217, NCP1217A
Enhanced PWM Current-Mode
Controller for High-Power
Universal Off-Line Supplies
Housed in an SO8 or PDIP7 package, the NCP1217 represents
the enhanced version of the NCP1203based controllers. Due to its
high drive capability, NCP1217 drives large gatecharge MOSFETs,
which together with internal ramp compensation and builtin
overvoltage protection, ease the design of modern AC/DC adapters.
NCP1217 offers a true alternative to UC384Xbased designs.
With an internal structure operating at different fixed frequencies
(65–100–133 kHz), the controller features a highvoltage startup FET,
which ensures a clean and loss less startup sequence. Its currentmode
control topology provides an excellent input audiosusceptibility and
inherent pulsebypulse 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 socalled
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 autorecovers. 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 VCC collapses to ground, e.g. the user unplugs
the power supply.
Features
CurrentMode with Adjustable SkipCycle Capability
Builtin Internal Ramp Compensation
AutoRecovery Internal Output ShortCircuit Protection
Internal 1.0 ms SoftStart (NCP1217A Only)
Limited DutyCycle to 50% (NCP1217A Only)
Full Latchoff if Adjustment Pin is Brought High
Extremely Low NoLoad 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 PbFree Devices
Typical Applications
High Power AC/DC Converters for TVs, SetTop Boxes, etc.
Offline Adapters for Notebooks
Telecom DCDC Converters
All Power Supplies
www.onsemi.com
8
1
SOIC8
D SUFFIX
CASE 751
MARKING
DIAGRAMS
8
XXXXX
ALYW
G
1
8
1
PDIP7
P SUFFIX
CASE 626B
XXXXXXXXX
AWL
YYWWG
1
XXXXXX = Specific Device Code
A = Assembly Location
L, WL = Wafer Lot
Y, YY = Year
W, WW = Work Week
G or G = PbFree Package
DEVICE MARKING INFORMATION
See detailed device marking information in the ordering
information section on page 17 of this data sheet.
PIN CONNECTIONS
Adj 1
FB 2
CS 3
GND 4
8 HV
7 NC
6 VCC
5 Drv
(Top View)
ORDERING INFORMATION
See detailed ordering and shipping information in the ordering
information section on page 17 of this data sheet.
© Semiconductor Components Industries, LLC, 2015
April, 2015 Rev. 9
1
Publication Order Number:
NCP1217/D

PagesPages 19
Télécharger [ NCP1217 ]


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