NCP1379DR2G ON Semiconductor, NCP1379DR2G Datasheet - Page 12

• Manufacturer Part Number: NCP1379DR2G
• Description: IC CTLR QUASI CURRENT MODE 8SOIC
• Manufacturer: ON Semiconductor

Specifications of NCP1379DR2G

• Output Isolation: Isolated
• Voltage - Input: 9 ~ 28 V
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 8-SOIC (0.154", 3.90mm Width)
• Duty Cycle (max): 6.7 %
• Mounting Style: SMD/SMT
• Switching Frequency: 65 KHz
• Operating Supply Voltage: 8.3 V to 12.3 V
• Supply Current: 1.7 mA
• Maximum Operating Temperature: + 125 C
• Fall Time: 25 ns
• Minimum Operating Temperature: - 40 C
• Rise Time: 40 ns
• Synchronous Pin: No
• Topology: Quasi-Resonant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

valleys are incremented from the first to the fourth. When
the fourth valley is reached, if FB voltage further decreases
below 0.8 V, the controller enters VCO mode.
decrease until it reaches 17.5% of the maximum peak
current: the switching frequency expands to deliver the
Laux
As the output load decreases (FB voltage decreases the
During VCO operation, the peak current continues to
ZCD
FB
Ct
Vdd
Rpullup
ICt
10 V
ESD
DRV
VDD
Ct setpoint
Vth
+
−
3 us puls e
Figure 23. Valley Detection Circuit
leakage
blanking
Discharge
+
−
http://onsemi.com
Ct
V FBth
V FB
12
necessary output power. This allows achieving very low
standby power consumption.
current of a 19 V / 60 W decreases from 2.8 A to 0.1 A. No
instability
(Figures 25, 26, 27 and 28)
The Figure 24 shows a simulation case where the output
demag
LOGIC BLOCK
is
Time Out CS comparator
seen
VDD
during
the
valley
R
S
Q
Q
transitions
DRV