NCP1605FORWGEVB ON Semiconductor, NCP1605FORWGEVB Datasheet - Page 11

• Manufacturer Part Number: NCP1605FORWGEVB
• Description: EVAL BOARD FOR NCP1605FORWG
• Manufacturer: ON Semiconductor

Specifications of NCP1605FORWGEVB

• Design Resources: NCP1605FORWGEVB BOM NCP1605FORWGEVB Gerber Files NCP1605 EVB Schematic
• Main Purpose: AC/DC, Primary and Secondary Side with PFC
• Outputs And Type: 1, Isolated
• Voltage - Output: 19V
• Current - Output: 8A
• Voltage - Input: 90 ~ 265VAC
• Regulator Topology: Forward Converter
• Frequency - Switching: 133kHz
• Board Type: Fully Populated
• Utilized Ic / Part: NCP1217, NCP1605
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power - Output: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• For Use With/related Products: NCP1605FORWG
• Other names: NCP1605FORWGEVBOS

Overload / Short Circuit Protections
detect overload conditions. A buffer (Q1x) builds a low
impedance signal that is linearly dependent of the feedback
pin of the forward controller. The OVL circuitry monitors
this voltage and if it exceeds 3 V, the npn transistor Q3 turns
on and disables the discrete regulator that powers the two
controllers.
Compared to the precedent one, Figure 10 further shows the 19 V output.
The application embeds a circuitry (see Figure 13) to
Figure 10. Startup Phase at 120 Vrms
19 V Output Voltage (10 V/div)
http://onsemi.com
AND8292
11
the 19 V output. In this situation, the power supply enters a
low duty-cycle, safe hiccup mode as shown by Figure 11.
Figure 12 that zooms Figure 11 shows that the circuit
operates over about 130 ms on a 3 s hiccup period (4%
duty-cycle).
This circuitry protects the circuit in case of short circuit on
Load Current (5 A/div)
V
BULK
pfcOK Signal
(100 V/div)