NCP1028LEDGEVB ON Semiconductor, NCP1028LEDGEVB Datasheet - Page 18

• 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

measurement as long as the NTC and the optocoupler are
not activated. As soon as the secondary optocoupler senses
an OVP condition, or the NTC reacts to a high ambient
In Figure 31, Q1 is blocked and does not bother the BO
Figure 31. Adding a comparator on the BO pin offers a way to latch-off the controller.
Figure 32. If the BO pin is lifted up to VLATCH, the controller permanently latches off.
Vout
NTC
V
CC
Q1
Vbulk
http://onsemi.com
Rupper
Rlower
NCP1028
BO
18
temperature, Q1 base is brought to ground and the BO pin
goes up, permanently latching off the controller. Figure 32
depicts the converter behavior in case of total latch-off.
+
VBO
+
Vlatch
+
+
-
-
IBO
←
20 ms
RC
To permanent
latch
V
BO
DD