NCP1129: High Voltage Switching Regulator for Offline SMPS
Description: The NCP1129 switcher offers everything needed to b...
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
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
Power Supply
End Products
Power supply for DVD, STB, CD-Player
Aux supply for TV, USB, Appliance
Technical Documentation & Design Resources
Evaluation/Development Tool Information
Availability and Samples
NCP1129AP100G
Status: Active
Compliance: Pb-free Halide free
Description: High Voltage Switching Regulator for Offline SMPS, 2-Ohm, Latch
Package Type: PDIP-8
Package Case Outline: 626B
MSL: NA
Container Type: TUBE
Container Qty: 50
NCP1129AP65G
Status: Active
Compliance: Pb-free Halide free
Description: High Voltage Switching Regulator for Offline SMPS, 2-Ohm, Latch
Package Type: PDIP-8
Package Case Outline: 626B
MSL: NA
Container Type: TUBE
Container Qty: 50
Inventory
Market Leadtime (weeks):2 to 4
Arrow:0
ON Semiconductor:9,550
NCP1129BP100G
Status: Active
Compliance: Pb-free Halide free
Description: High Voltage Switching Regulator for Offline SMPS, 2-Ohm, Auto-recovery
Package Type: PDIP-8
Package Case Outline: 626B
MSL: NA
Container Type: TUBE
Container Qty: 50
NCP1129BP65G
Status: Active
Compliance: Pb-free Halide free
Description: High Voltage Switching Regulator for Offline SMPS, 2-Ohm, Auto-recovery
Package Type: PDIP-8
Package Case Outline: 626B
MSL: NA
Container Type: TUBE
Container Qty: 50
Inventory
Market Leadtime (weeks):2 to 4
Arrow:0
Digikey:<1K
ON Semiconductor:19,750
Applications
Specifications
Control Mode:
Current Mode
fsw Typ (kHz):
100
65
fJitter Typ (%):
+/-5% of FSW
Stand-by Mode:
Yes
RDS(ON) Typ (Ω):
2
V(BR)DSS Max (V):
650
IPeak (mA):
0
HV Start-up Min (V):
Yes
DSS (mA):
0
UVLO:
8.8
Short Circuit Protection:
Yes
Over Power Compensation:
No
Brown-out:
No
Latch:
Yes
No
Package Type:
PDIP-8
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