NCP1028LEDGEVB ON Semiconductor, NCP1028LEDGEVB Datasheet - Page 23
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NCP1028LEDGEVB
Manufacturer Part Number
NCP1028LEDGEVB
Description
EVAL BOARD FOR NCP1028LEDG
Manufacturer
ON Semiconductor
Specifications of NCP1028LEDGEVB
Design Resources
NCP1028LEDGEVB BOM CP1028LEDGEVB Gerber Files NCP1028LED EVB Schematic
Current - Output / Channel
720mA
Outputs And Type
1, Isolated
Voltage - Output
18V
Voltage - Input
90 ~ 265VAC
Utilized Ic / Part
NCP1028
Core Chip
NCP1028
Topology
Flyback
No. Of Outputs
1
Output Current
720mA
Output Voltage
18V
Development Tool Type
Hardware - Eval/Demo Board
Leaded Process Compatible
Yes
Mcu Supported Families
NCP1028
Rohs Compliant
Yes
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Features
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
For Use With/related Products
NCP1028LEDG
Other names
NCP1028LEDGEVBOS
Jittering
signature by spreading the energy in the vicinity of the main
switching component. The NCP1028 offers a "6%
deviation of the nominal switching frequency. The sweep
Skip-Cycle
power by skipping unwanted cycles at light loads.
However, the recurrent frequency in skip often enters the
audible range and a high peak current obviously generates
acoustic noise in the transformer. The noise takes its origins
Frequency jittering is a method used to soften the EMI
Skip cycle offers an efficient way to reduce the standby
Figure 41. Low Peak Current Skip Cycle Guarantees Noise-Free Operation
0
Figure 40. Modulation Effects on the Clock Signal by the
61.1kHz
Jitter ramp
Nominal peak
current
65kHz
adjustable
Jittering Sawtooth
http://onsemi.com
NCP1028
23
68.9kHz
sawtooth is internally generated and modulates the clock
up and down with a fixed frequency of 300 Hz. Figure 40
shows the relationship between the jitter ramp and the
frequency deviation. It is not possible to externally disable
the jitter.
in the resonance of the transformer mechanical structure
which is excited by the skipping pulses. A possible
solution, successfully implemented in the NCP1200 series,
also authorizes skip cycle but only when the power demand
as dropped below a given level. This is what Figure 41
shows, as implemented on the NCP1028.
Internal
sawtooth
Skip cycle
current limit