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參數資料
| 型號： | 88EM8081XX-SAG2C000-T |
| 廠商： | MARVELL SEMICONDUCTOR INC |
| 元件分類： | 穩壓器 |
| 英文描述： | 2 A POWER FACTOR CONTROLLER, 120 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | GREEN, SOIC-8 |
| 文件頁數： | 26/64頁 |
| 文件大小： | 667K |
| 代理商： | 88EM8081XX-SAG2C000-T |
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88EM8080/88EM8081
Datasheet
Doc. No. MV-S106340-01 Rev. B
Copyright 2010 Marvell
Page 32
Document Classification: Proprietary
August 6, 2010, Preliminary Information
The advantages of this device operating under Mixed Mode Control when compared to Critical
Transition Mode are shown in Table 6.
5.2
Input Voltage Resistor Divider on VIN Pin
Accurate peak detection signal and zero-cross detection for regenerating the input sinusoidal
voltage is the most important issue for a proper current shaping and total harmonic distortion (THD)
improvement. A peak detecting pulse is generated after comparing the VIN sinusoidal signal to an
internal threshold reference of 0.72V (typical) as shown in Figure 17. If the threshold reference is too
high, near the peak area, the calculation may lose accuracy because of the low slope. On the other
hand, if the threshold reference is too low, there could be an error on zero-cross detection due to the
possible distortions near the zero-crossing. For a universal input voltage range (85Vac~270Vac) the
optimum accuracy would be achieved if the threshold level is around 30 of the line cycle.
Figure 16: Internal Block for Zero-cross Detection, Brown-out Protection
Table 6:
Comparison between Critical Transition Mode and Mixed Mode Controls
Cri t ical Tr ansi ti on Mode Co nt ro l
Mi xed M o de – CCM/ DCM Control
High peak current on switch
Low peak current on switch
High diode peak current at secondary side
Low diode peak current at secondary side
Variable switching frequency with lowest
switching frequency at peak input voltage
Fixed switching frequency
Big transformer
Small transformer
Difficult to achieve high power
Easy to achieve high power
High cost
Low cost
AC
IN
Ra
Rb
Rc
VIN
88EM8080
/8081
Peak
detecting
pulse
Phase ( )
Zero
Crossing
Power Limit
Threshold
Selection
φ
Brown-Out
Protection
Predictive
Sinusoidal
AC Voltage
VDCin
Vline_pk
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