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SC1933C Datasheet(PDF) 12 Page - Power Integrations, Inc.

No. de pieza SC1933C
Descripción Electrónicos  Off-Line CV/CC QR Flyback Switcher IC with Integrated Primary Switch, Synchronous Rectification and FluxLink Feedback
PDF  28 Pages
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Fabricante Electrónico  POWERINT [Power Integrations, Inc.]
Página de inicio  http://www.powerint.com
Logo POWERINT - Power Integrations, Inc.

SC1933C Datasheet(HTML) 12 Page - Power Integrations, Inc.

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Rev. C 11/18
12
SC1933C/SC1936C
www.power.com
FORWARD Pin Resistor
A 47 Ω, 5% resistor is recommended to ensure sufficient IC supply
current. A higher or lower resistor value should not be used as it can
affect device operation such as the timing of the synchronous rectifier
drive. Figures 8, 9, 10 and 11 below show examples of unacceptable
and acceptable FORWARD pin voltage waveforms. V
D is forward
voltage drop across the SR FET.
Figure 8. Unacceptable FORWARD Pin Waveform After Handshake with
SR FET Conduction During Flyback Cycle.
Figure 9. Acceptable FORWARD Pin Waveform After Handshake with
SR FET Conduction During Flyback Cycle.
Figure 10. Unacceptable FORWARD Pin Waveform before Handshake with Body
Diode Conduction During Flyback Cycle.
Note:
If t
1 + t2 = 1.5 ms ± 50 ns, the controller may fail the handshake and
trigger a primary bias winding OVP latch-off.
Figure 11. Acceptable FORWARD Pin Waveform before Handshake with Body
Diode Conduction During Flyback Cycle.
0 V
VSR(TH)
VD
PI-8392-051818
0 V
VSR(TH)
VD
PI-8393-051818
PI-8394-051818
0 V
VSR(TH)
VD
t1
t2
0 V
VSR(TH)
VD
PI-8395-051818



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