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MV1001SC Fiches technique(PDF) 9 Page - Shindengen Electric Mfg.Co.Ltd

No de pièce MV1001SC
Description  LED driver IC
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Fabricant  SHINDENGEN [Shindengen Electric Mfg.Co.Ltd]
Site Internet  http://www.shindengen.co.jp/
Logo SHINDENGEN - Shindengen Electric Mfg.Co.Ltd

MV1001SC Fiches technique(HTML) 9 Page - Shindengen Electric Mfg.Co.Ltd

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MV1001SC
8
3. Component selection procedure and calculation method
The calculation is an estimate. In an actual circuit, errors may occur for various reasons, including the characteristics of
individual parts and IC detection delays. Be sure to check with the actual apparatus and to make any adjustments needed.
When using an oscilloscope to verify waveforms, note that the waveform and characteristics change depending on
probe capacitance. In particular, pay close attention when measuring the Svin, Svout, and CS pins, and D-S of the
MOSFET.
Unless otherwise specified, the figures used in this document are typical values.
3.1 Basic circuit configuration
Figure 4 shows the basic circuit configuration. Figure 5 shows the basic operation waveforms. Since MV1001SC can
provide an internal power supply from the high-voltage start circuit in the Vin pin, a high pressure (less than DC250V) after
full-wave rectification can be input directly (bus voltage direct supply).
As shown in Figure 4, detecting the voltages on both ends of the choke eliminates the need for an auxiliary winding and
enables a simple, low-cost circuit configuration.
Figure 4 Basic circuit configuration
ton
toff1
toff2
VDS (D-S voltage waveform of Q1)
Ip
Io
Vi-Vo
Vi-2Vo-VF (Voltage of valley)
(*)The chart emphasizes the toff2 period.
Vi+VF
IL(Current waveform of L)
Ip
Vo
Vi
L
ton
Ip
V
Vo
L
1
toff
F
CAT.No.1A0102-1E
Figure 5 Basic operation waveforms


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