NCP1028LEDGEVB ON Semiconductor, NCP1028LEDGEVB Datasheet - Page 13

• 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

Fault Condition – Output Short-Circuit
internally enabled. If everything is correct, the auxiliary
winding increases the voltage on the V
voltage rises. During the start-sequence, the controller
smoothly ramps up the peak current to Imax setting, e.g.
Ipeak_HI, which is reached after a typical period of 1.0 ms.
As soon as the peak current setpoint reaches its maximum
(during the startup period but also anytime an overload
occurs), an internal error flag is asserted, Ipflag, indicating
As soon as V
Figure 26. In case of short-circuit or overload, the NCP1028 protects itself and the power supply via a low
frequency burst mode. The V
CC
reaches VCC
ON
CC
CC
, drive pulses are
pin as the output
is maintained by the current source and self-supplies the controller.
http://onsemi.com
NCP1028
13
that the system has reached its maximum current limit set
point (Ip = Ip max). The assertion of this flag triggers a
55 ms counter. If at counter completion Ipflag remains
asserted, all driving pulses are stopped and the part stays off
during eight periods of 55 ms (440 ms). A new attempt to
restart occurs and will last 55 ms providing the fault is still
present. If the fault still affects the output, a safe burst mode
is entered, affected by a low duty-cycle operation (11%).
When the fault disappears, the power supply quickly
resumes operation. Figure 26 depicts this particular mode.