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NCP1217/D

更新时间： 2024-11-28 23:53:23
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其他 - ETC 控制器
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18页 162K
描述
Enhanced PWM Current-Mode Controller for High-Power Universal Off-line supplies

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NCP1217/D 数据手册

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NCP1217  
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. Thanks 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 start−up  
FET, which ensures a clean and loss less start−up 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 pin1 above 3.2 V, output pulses are  
immediately stopped and the NCP1217 stays latched in this position.  
http://onsemi.com  
MINIATURE PWM  
CONTROLLER FOR HIGH  
POWER AC/DC WALL  
ADAPTERS AND OFFLINE  
BATTERY CHARGERS  
MARKING  
DIAGRAMS  
8
SO−8  
D SUFFIX  
CASE 751  
17Dyy  
ALYW  
8
8
1
1
PDIP−7  
P SUFFIX  
CASE 626B  
P1217Pxxx  
AWL  
YYWW  
Reset occurs when the V collapses to ground, e.g. the user unplugs  
CC  
1
the power supply.  
1
Features  
xxx  
yy  
= Device Code: 065, 100 or 133  
= Device Code:  
06 for 65  
10 for 100  
13 for 133  
= Assembly Location  
• Current−Mode with Adjustable Skip−Cycle Capability  
• Built−in Internal Ramp Compensation  
• Auto−Recovery Internal Output Short−Circuit Protection  
• Full Latch−Off if Adjustment Pin is Brought High  
• Extremely Low No−Load Standby Power  
• Internal Temperature Shutdown  
A
WL, L = Wafer Lot  
YY, Y = Year  
WW, W = Work Week  
• 500 mA Peak Current Capability  
• Fixed Frequency Versions at 65 kHz, 100 kHz and 133 kHz  
• Direct Optocoupler Connection  
PIN CONNECTIONS  
• Internal Leading Edge Blanking  
• SPICE Models Available for TRANsient and AC Analysis  
Adj  
FB  
1
2
3
4
8
7
6
5
HV  
NC  
V
Typical Applications  
• High Power AC/DC Converters for TVs, Set−Top Boxes, etc.  
• Offline Adapters for Notebooks  
• Telecom DC−DC Converters  
CS  
CC  
Gnd  
Drv  
(Top View)  
• All Power Supplies  
ORDERING INFORMATION  
See detailed ordering and shipping information in the package  
dimensions section on page 15 of this data sheet.  
Semiconductor Components Industries, LLC, 2003  
1
Publication Order Number:  
September, 2003 − Rev. 0  
NCP1217/D  
1234567...18

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