NCP1380CDR2G ON Semiconductor, NCP1380CDR2G Datasheet - Page 14

• Manufacturer Part Number: NCP1380CDR2G
• Description: IC PWM FLYBCK ISO CM 8SOIC
• Manufacturer: ON Semiconductor

Specifications of NCP1380CDR2G

• Pwm Type: Current Mode
• Number Of Outputs: 1
• Frequency - Max: 65kHz
• Voltage - Supply: 9.4 V ~ 28 V
• Buck: No
• Boost: No
• Flyback: Yes
• Inverting: No
• Doubler: No
• Divider: No
• Cuk: No
• Isolated: Yes
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 8-SOIC (3.9mm Width)
• Frequency-max: 65kHz
• Mounting Style: SMD/SMT
• Operating Supply Voltage: - 0.3 V to + 28 V
• Supply Current: +/- 30 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
• Duty Cycle: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

voltage of the auxiliary winding of the transformer. A
valley is detected when the voltage on pin 1 crosses
down the 55 mV internal threshold. When a valley is
The valley detection is done by monitoring the
La ux
ZCD
FB
Ct
VDD
Rpullup
ICt
10 V
ES D
DRV
VDD
Figure 26. Operating Valley According to FB Voltage
Ct setpoint
Vth
VALLEY DETECTION AND SELECTION
+
−
3 us puls e
Figure 27. Valley Detection Circuit
leakage
blanking
+
−
Discharge
http://onsemi.com
Ct
V FB
V FBth
14
detected, an internal counter is incremented. The
operating valley (1
the FB voltage as shown by Figure 26.
de m a g
LOGIC BLOCK
Tim e Out
VDD
st
, 2
nd
CS comparator
, 3
rd
or 4
th
) is determined by
R
S
Q
Q
DRV