NCP1207BDR2G ON Semiconductor, NCP1207BDR2G Datasheet - Page 14

• Manufacturer Part Number: NCP1207BDR2G
• Description: IC CTRLR PWM CM OVP OCP HV 8SOIC
• Manufacturer: ON Semiconductor

Specifications of NCP1207BDR2G

• Output Isolation: Isolated
• Voltage - Input: 10.6 ~ 20 V
• Operating Temperature: -40°C ~ 150°C
• Package / Case: 8-SOIC (0.154", 3.90mm Width) 7 leads
• Number Of Outputs: 1
• Duty Cycle (max): 28.6 %
• Output Current: 500 mA
• Mounting Style: SMD/SMT
• Switching Frequency: 75 KHz
• Operating Supply Voltage: 20 V
• Maximum Operating Temperature: + 150 C
• Fall Time: 20 ns
• Minimum Operating Temperature: - 40 C
• Rise Time: 40 ns
• Synchronous Pin: No
• Topology: Flyback
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Operation Shots
V
primary inductance.
operating points:
in
Below are some oscilloscope shots captured at
This plot gathers waveforms captured at three different
1
P
2
and selects the second valley
3
and will further expand the burst as P
st
nd
rd
= 120 VDC with a transformer featuring a 800 mH
out
lowest plot: the skip slices the second valley pattern
middle plot: min T
upper plot: free run, valley switching operation,
= 26 W
Figure 25.
off
clamps the switching frequency
out
goes low
http://onsemi.com
14
current creates the skip cycle level.
presence of a secondary overload.
This picture explains how the 200 mA internal offset
The short- -circuit protection forces the IC to enter burst in
Current Sense Pin (200 mV/div)
V
CC
V
GATE
(5 V/div)
200 mA X R
(5 V/div)
Figure 26.
Figure 27.
SKIP
V
GATE
V
Rsense
(5 V/div)
(200 mV/div)