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參數(shù)資料
| 型號(hào)： | 88EM8081XX-SAG2C000-T |
| 廠商： | MARVELL SEMICONDUCTOR INC |
| 元件分類： | 穩(wěn)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(shù)： | 46/64頁 |
| 文件大?。?/td> | 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 50
Document Classification: Proprietary
August 6, 2010, Preliminary Information
The voltage Vbe should have tolerance margin to select the resistor, Rsen. Rsen can be selected from
the following equation.
Equation (36)
The minimum saturation current point of Ilim for the transformer should satisfy:
Equation (37)
Ilim should have enough margins considering transformer saturation condition at lower ambient
temperature.
R1 and R2 act as voltage dividers to setup the right current limitation threshold. R2 controls base
current of the transistor Q2. R1 helps to discharge the parasitic capacitance of the transistor. The
value of R1 is recommended as 500~2k, R2 as 500~2k and R3 as 10k where R3 is connected
between the collector of Q2 and OCP.
A capacitor in parallel with the Rsns resistor is used to filter the noise for this OCP circuit to function
properly. When the MOSFET turns on, external COSS of the MOSFET starts discharging. This
causes the leading edge spikes of current and increases switching loss. Figure 25 shows that this
spike of current causes unwanted over current protection. This phenomenon can be avoided by
adding one capacitor, Csen. The leading edge current timing is less than 300ns (typical). Csen is
recommended to have a value of 0.22
μF/25V. The capacitive reactance of Csen should be far less
than Rsen for proper filtering of this leading edge current spike.
R
sen
0.50V
I
ds
peak
----------------
≤
I
lim
0.75V
R
sen
--------------
R
1
R
2
+
()
R
1
-----------------------
×
=
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