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| 型号： | 88EM8081XX-SAG2C000-T |
| 厂商： | MARVELL SEMICONDUCTOR INC |
| 元件分类： | 稳压器 |
| 英文描述： | 2 A POWER FACTOR CONTROLLER, 120 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | GREEN, SOIC-8 |
| 文件页数： | 4/64页 |
| 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 12
Document Classification: Proprietary
August 6, 2010, Preliminary Information
Table 2:
Pin Descriptions
Pi n #
Pi n Name
P i n Fun cti o n
1PGND
Power Ground
Connected to the source of the primary MOSFET.
The PCB trace from the power ground to the source of the primary MOSFET must be kept
as short as possible.
To avoid any switching noise interruption on signal processing, PGND and SGND remain
seperate inside the IC.
2SGND
Signal Ground
Must be connected to the power ground with the Kelvin sensing connection (typically
connected to the source of the external MOSFET) so that SGND has dedicated trace and
connections and provides clean signal integrity.
To avoid any switching noise interruption on signal processing, SGND and PGND remain
seperate inside the IC.
3ISNS
Current Sense
Used for current shaping and for over current protection.
Sense resistor varies for different loads.
Examples - 0.15
Ω at 120W rated load and 0.6Ω for 30W rated load.
4VIN
Voltage Input
Connects to resistance divider at input AC line “phase” to GND. Voltage applied is a half
rectified sine wave scaled down by the input resistance divider.
Voltage input pin is a high impedance input pin. An impedance of 2M (typical) is
recommended to be designed from the input AC “phase” to GND for the VIN resistor dividor
network to reduce the standby power. Higher impedance is preferred with the right PCB
design on this pin signal.
This voltage input after comparing with an internal threshold reference is used to detect the
zero-cross location of the input sine wave and is also used to synthesize (regenerate) the
input sine wave. This regenerated sine wave is used for the current reference.
Brown-out protection function is also provided by this pin. A resistor devider with a 100:1
ratio from the highside resistor to the lowside resistor is corresponding to a “brown-out
protection” input voltage of 50V (RMS). Increasing that ratio will increase the “brown-out
Section 5.2 for further understanding.
5FB
Feedback
The output voltage of 100% rated value is scaled to 2.5V at the FB Pin.
Transition from soft-start to normal regulation is at 87.5% rated VFB. When FB pin voltage
exceeds VFB_OVP, the IC shuts down the SW pin driver pulse. SW pin driver pulse recovers
when FB pin falls below the reference voltage, VFB_REG.
There is another OVP latch threshold (VFB_OVP_LATCH) of 3.77V on the FB pin. When FB
exceeds VFB_OVP_LATCH, latched over voltage shutdown occurs until another VDD power
on resets the latch.
The effective resistance between FB and GND is 200k (typical).
6OCP
Over Current Protection
Used to turn off the MOSFET when it is pulled as logic low
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