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NCP1129: High Voltage Switching Regulator for Offline SMPS

Datasheet: High Voltage Switcher for Offline Power Supplies
Rev. 3 (189kB)
Product Overview
»View Reliability Data
»View Material Composition
» Product Change Notification
The NCP1129 switcher offers everything needed to build reliable and compact AC-DC switching power supplies with minimal surrounding elements. Incorporating an avalanche rated 650 V MOSFET, converters built with the NCP1129 can be safely designed for international conditions without jeopardizing the overall reliability.

The NCP1129 implements peak current mode control with adjustable ramp compensation that ensures stability in Continuous Conduction Mode (CCM) operation. With an external resistor, the maximum peak current is adjustable, allowing the designer the ability to inject ramp compensation to stabilize CCM power supplies.

A short circuit fault condition is independently detected from the auxiliary winding voltage resulting in improved short circuit protection with true overload detection. The Source pin provides access to the MOSFET source, allowing for overpower compensation.

With a supply range up to 26 V, the switcher also provides a jittered 65 kHz or 100 kHz switching frequency operated in peak current mode control. When the power on the secondary side starts to decrease, the switcher automatically folds back its switching frequency down to a minimum level of 26 kHz. As the power further goes down, the part enters skip cycle while limiting the peak current.
Features   Benefits
     
  • 650 V Avalanche Rated MOSFET
 
  • Rugged MOSFET for robust design
  • FixedFrequency 65 or 100 kHz CurrentMode Control Operation
 
  • Ability to scale for efficiency or size
  • Frequency Foldback Down to 26 kHz and SkipCycle in Light Load Conditions
 
  • Eliminate acoustic noise and improved efficiency at light loads
  • Adjustable Current Limit
 
  • Scale for various designs 5W~20W
  • 50 ms Timer-Based Auto-Recovery Short-Circuit Protection
 
  • Provides more robust protection without worrying about the coupling of the aux winding
  • Frequency Jittering in Normal and Frequency Foldback Modes
 
  • Improved efficiency at light load / Improved EMI over the entire load
  • Option for Auto-Recovery or Latched Short-Circuit Protection
 
  • Flexible protection options
  • Less than 100 mW Standby Power at High Line
 
  • EPS 2.0 Compliant
Applications   End Products
  • Power Supply
 
  • Power supply for DVD, STB, CD-Player
  • Aux supply for TV, USB, Appliance
Availability & Samples
Specifications
Application Diagram
Product
Status
Compliance
Description
Package
MSL
Container
Budgetary Price/Unit
Type
Case Outline
Type
Temperature
Type
Qty.
NCP1129AP100G Active
Pb-free
Halide free
NCP1129, 2-Ohm, Latch PDIP-8 626B NA Tube 50 $0.6556
NCP1129AP65G Active
Pb-free
Halide free
NCP1129, 2-Ohm, Latch PDIP-8 626B NA Tube 50 $0.6556
NCP1129BP100G Active
Pb-free
Halide free
NCP1129, 2-Ohm, Auto-recovery PDIP-8 626B NA Tube 50 $0.6556
NCP1129BP65G Active
Pb-free
Halide free
NCP1129, 2-Ohm, Auto-recovery PDIP-8 626B NA Tube 50 $0.6556
Market Leadtime (weeks) : 2 to 4
ON Semiconductor   (2020-09-02 00:00) : 19,950
Market Leadtime (weeks) : 8 to 12
Market Leadtime (weeks) : Contact Factory
ON Semiconductor   (2020-09-02 00:00) : 17,100
Market Leadtime (weeks) : Contact Factory

Product
Description
Pricing ($/Unit)
Compliance
Status
Control Mode
fsw Typ (kHz)
fJitter Typ (%)
Stand-by Mode
RDS(ON) Typ (Ω)
V(BR)DSS Max (V)
IPeak (mA)
HV Start-up Min (V)
DSS (mA)
UVLO
Short Circuit Protection
Over Power Compensation
Brown-out
Latch
Package Type
NCP1129AP100G  
 $0.6556 
Pb
H
 Active   
Current Mode
100
+/-5% of FSW
Yes
2
650
0
Yes
0
8.8
Yes
No
No
Yes
PDIP-8
NCP1129AP65G  
 $0.6556 
Pb
H
 Active   
Current Mode
65
+/-5% of FSW
Yes
2
650
0
Yes
0
8.8
Yes
No
No
Yes
PDIP-8
NCP1129BP100G  
 $0.6556 
Pb
H
 Active   
Current Mode
100
+/-5% of FSW
Yes
2
650
0
Yes
0
8.8
Yes
No
No
No
PDIP-8
NCP1129BP65G  
 $0.6556 
Pb
H
 Active   
Current Mode
65
+/-5% of FSW
Yes
2
650
0
Yes
0
8.8
Yes
No
No
No
PDIP-8
Case Outlines
626B   
NCP1129: High Voltage Switching Regulator for Offline SMPS
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