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MV1002SC Arkusz danych(PDF) 7 Page - Suntan Capacitors

Numer części MV1002SC
Szczegółowy opis  LED driver IC
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Producent  SUNTAN [Suntan Capacitors]
Strona internetowa  http://www.suntan.com.hk
Logo SUNTAN - Suntan Capacitors

MV1002SC Arkusz danych(HTML) 7 Page - Suntan Capacitors

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MV1002SC
6
2. Explanation of basic operations
The MV1002SC 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 MV1002SC detects Id, converted to a voltage, with the current detection pin (CS pin). When it reaches the CS
reference voltage, the MV1002SC 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 19.)
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
Ip
Io
Vi
Vo
Detect
intersection
IF
Id
Delay in detection by IC + gate delay
0
0
CAT.No.1A0202-2E


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