NCP1308DR2G ON Semiconductor, NCP1308DR2G Datasheet - Page 14

• Manufacturer Part Number: NCP1308DR2G
• Description: IC CTRLR PWM CM UVLO HV 8SOIC
• Manufacturer: ON Semiconductor

Specifications of NCP1308DR2G

• Pwm Type: Current Mode
• Number Of Outputs: 1
• Frequency - Max: 75kHz
• Voltage - Supply: 11 V ~ 20 V
• Buck: No
• Boost: No
• Flyback: Yes
• Inverting: No
• Doubler: No
• Divider: No
• Cuk: No
• Isolated: No
• Operating Temperature: 0°C ~ 125°C
• Package / Case: 8-SOIC (3.9mm Width)
• Frequency-max: 75kHz
• Output Current: 500 mA
• Mounting Style: SMD/SMT
• Operating Supply Voltage: 20 V
• Fall Time: 20 ns
• Rise Time: 40 ns
• Synchronous Pin: No
• Topology: Flyback
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Duty Cycle: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: NCP1308DR2G; NCP1308DR2GOSTR

Operation Shots
Below are some oscilloscope shots captured at Vin = 120 VDC with a transformer featuring a 800 mH primary inductance:
Figure 25. This plot gathers waveforms captured at three different operating points:
1
2
the second valley.
3
further expand the burst as Pout goes low.
Figure 26. This picture explains how the 200 mA internal offset
st
nd
rd
Upper Plot: Free run, valley switching operation, Pout = 26 W.
Lowest Plot: The skip slices the second valley pattern and will
Middle Plot: Min Toff clamps the switching frequency and selects
Current Sense Pin (200 mV/pin)
current creates the skip cycle level.
Vgate (5 V/div)
200 mA x Rskip
http://onsemi.com
NCP1308
14
Vrsense (200 mV/div)