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MV1011SC Fiches technique(PDF) 7 Page - Shindengen Electric Mfg.Co.Ltd

No de pièce MV1011SC
Description  LED driver IC
Download  35 Pages
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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

MV1011SC Fiches technique(HTML) 7 Page - Shindengen Electric Mfg.Co.Ltd

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MV1011SC
6
2. Explanation of basic operations
The MV1011SC is a critical conduction mode (CRM) step-down chopper control IC. Figure 1 shows the circuit
configuration. Figure 2 shows the waveforms of currents flowing to the MOSFET and the diode, represented by Id and IF,
respectively. In a general CRM step-down chopper circuit, the MOSFET is turned on after the IF becomes zero, leaving
little recovery current for the diode and lower losses and noises than a PWM circuit. Meanwhile, disadvantageously, the
oscillation frequency changes dramatically as the output current (LED current) changes, resulting in poorer dimming
characteristics and efficiency.
The MV1011SC detects Id, converted to a voltage, with the current detection pin (CS pin). When it reaches the CS
reference voltage, the MV1011SC turns the MOSFET off (peak current detection). The IC performs CRM control in this
way: When the diode current IF becomes zero, the Svout voltage falls below the Svin voltage, so the IC detects this state
(zero current detection) and turns the MOSFET on. The voltages on both ends of the choke (① and ② in Figure 2) are
divided with resistors and input to the Svin pin and the Svout pin to achieve CRM operations without auxiliary winding.
Additionally, the off-time modulation prevents the frequency increasing during dimming and achieves constant high
efficiency and dimming characteristics during deep dimming. (See Section 5 [Dimming characteristics] on page 20.)
Figure 1 CRM step-down chopper circuit
Figure 2 MOSFET and diode current waveforms of the CRM step-down chopper and voltage waveforms
on both ends of the choke
4
MV1011SC
3
2
1
5
6
7
8
Vi
REF
GND
Io
Id
IF
Vo
Ip
Io
Vi
Vo
Detect
intersection
IF
Id
Delay in detection by IC + gate delay
0
0
CAT.No.1A0402-1E


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