Product Overview

Product Overview
NCP1129: High Voltage Switching Regulator for Offline SMPS
For complete documentation, see the data sheet
Product Description
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
• FixedFrequency 65 or 100 kHz CurrentMode Control
Operation
• Frequency Foldback Down to 26 kHz and SkipCycle in Light
Load Conditions
• Adjustable Current Limit
• 50 ms Timer-Based Auto-Recovery Short-Circuit Protection
• Frequency Jittering in Normal and Frequency Foldback
Modes
• Option for Auto-Recovery or Latched Short-Circuit Protection
• Less than 100 mW Standby Power at High Line
Applications
• Rugged MOSFET for robust design
• Ability to scale for efficiency or size
• Eliminate acoustic noise and improved efficiency at light
loads
• Scale for various designs 5W~20W
• Provides more robust protection without worrying about the
coupling of the aux winding
• Improved efficiency at light load / Improved EMI over the
entire load
• Flexible protection options
• EPS 2.0 Compliant
End Products
• Power Supply
• Power supply for DVD, STB, CD-Player
• Aux supply for TV, USB, Appliance
Part Electrical Specifications
Product
Compliance
Status
Contr fsw
fJitter
ol
Typ
Typ
Mode (kHz) (%)
Stan RDS(O V(BR)
DSS
d-by N)
Max
Mode Typ
(Ω)
(V)
IPeak
(mA)
HV
DSS
Start- (mA)
up
Min
(V)
UVL
O
Short
Circu
it
Prote
ction
Over Brow
Powe n-out
r
Com
pens
ation
Latch Pack
age
Type
NCP1129AP100G
Pb-free
Active
Curre 100
nt
Mode
+/5%
of
FSW
Yes
2
650
0
Yes
0
8.8
Yes
No
No
Yes
PDIP
-8
Active
Curre 65
nt
Mode
+/5%
of
FSW
Yes
2
650
0
Yes
0
8.8
Yes
No
No
Yes
PDIP
-8
Active
Curre 100
nt
Mode
+/5%
of
FSW
Yes
2
650
0
Yes
0
8.8
Yes
No
No
No
PDIP
-8
Active
Curre 65
nt
Mode
+/5%
of
FSW
Yes
2
650
0
Yes
0
8.8
Yes
No
No
No
PDIP
-8
Halide free
NCP1129AP65G
Pb-free
Halide free
NCP1129BP100G
Pb-free
Halide free
NCP1129BP65G
Pb-free
Halide free
Application Diagram
For more information please contact your local sales support at www.onsemi.com
Created on: 6/30/2016