NCP1217, NCP1217A
Enhanced PWM Current鈭扢ode
Controller for High鈭扨ower
Universal Off鈭扡ine Supplies
Housed in an SO鈭? or PDIP鈭? package, the NCP1217 represents
the enhanced version of the NCP1203鈭抌ased controllers. Thanks to its
high drive capability, NCP1217 drives large gate鈭抍harge MOSFETs,
which together with internal ramp compensation and built鈭抜n
overvoltage protection, ease the design of modern AC/DC adapters.
NCP1217 offers a true alternative to UC384X鈭抌ased designs.
With an internal structure operating at different fixed frequencies
(65鈥?00鈥?33 kHz), the controller features a high鈭抳oltage startup FET,
which ensures a clean and loss less startup sequence. Its current鈭抦ode
control topology provides an excellent input audio鈭抯usceptibility and
inherent pulse鈭抌y鈭抪ulse 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鈭抍alled
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鈭抮ecovers. 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
http://onsemi.com
MINIATURE PWM
CONTROLLER FOR HIGH
POWER AC/DC WALL
ADAPTERS AND OFFLINE
BATTERY CHARGERS
MARKING
DIAGRAMS
8
SO鈭?
D SUFFIX
CASE 751
1
1
17XXX
ALYW
8
PDIP鈭?
P SUFFIX
CASE 626B
8
1
XXXX
A
WL, L
YY, Y
WW, W
1
P1217XXXX
AWL
YYWW
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Current鈭扢ode with Adjustable Skip鈭扖ycle Capability
Built鈭抜n Internal Ramp Compensation
Auto鈭扲ecovery Internal Output Short鈭扖ircuit Protection
Internal 1.0 ms Soft鈭扴tart (A Version Only)
Limited Duty鈭扖ycle to 50% (A Version Only)
Full Latchoff if Adjustment Pin is Brought High
Extremely Low No鈭扡oad 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
Pb鈭扚ree Packages are Available
High Power AC/DC Converters for TVs, Set鈭扵op Boxes, etc.
Offline Adapters for Notebooks
Telecom DC鈭扗C Converters
All Power Supplies
= Specific Device Code*
= Assembly Location
= Wafer Lot
= Year
= Work Week
*DEVICE MARKING INFORMATION
See detailed device marking information in the ordering
information section on page 16 of this data sheet.
PIN CONNECTIONS
Adj 1
FB 2
CS 3
Gnd 4
(Top View)
8
7
6
5
HV
NC
V
CC
Drv
Typical Applications
ORDERING INFORMATION
See detailed ordering and shipping information in the ordering
information section on page 16 of this data sheet.
漏
Semiconductor Components Industries, LLC, 2004
1
July, 2004 鈭?Rev. 3
Publication Order Number:
NCP1217/D
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