參數(shù)資料
型號(hào)： SG6902
廠商： Fairchild Semiconductor Corporation
英文描述： Green-Mode PFC / Flyback-PWM Controller
中文描述： 綠色模式PFC /反激式，PWM控制器
文件頁(yè)數(shù)： 18/22頁(yè)
文件大?。?/td> 863K
代理商： SG6902
Product Specification
Green-Mode PFC / Flyback-PWM Controller
and the output power limit is higher than under low V
PFC
.
To compensate for this variation, the peak current
threshold is modulated by the RANGE output. When
RANGE is shorted to GND, the PFC output voltage is
high and the corresponding threshold is 0.65V. When
RANGE is opened, the PFC output voltage is low and the
corresponding threshold is 0.7V.
SG6902
System General Corp.
Version 1.3.1 (IAO33.0022.B3)
- 18 -
www.sg.com.tw www.fairchildsemi.com
September, 2007
FIG.8 Peak Current Control Loop
Limited Power Control
Every time the output of power supply is shorted or
overloaded, the FBPWM voltage increases. If the FB
voltage is higher than a designed threshold, 4.5V, for
longer than 56ms, the OPWM is turned off.
As OPWM is
turned off, the supply voltage V
DD
begins decreasing.
When V
DD
is lower than the turn-off threshold, such as
10V, SG6902 is totally shut down. Due to the start-up
resistor, V
DD
is charged up to the turn-on threshold
voltage, 16V, until enabled again. If the overloading
condition persists, the protection occurs repeatedly to
prevent the power supply from being overheated during
overloading condition
.
Over-Temperature Protection (OTP)
SG6902 provides an OTP pin for over-temperature
protection. A constant current is output from this pin. If R
I
is equal to 24k
, the magnitude of the constant current is
100μA. An external NTC thermistor must be connected
from this pin to ground, as shown as Figure 9. When the
OTP voltage drops below 1.2V, SG6902 is disabled until
the OTP voltage exceeds 1.4V.
Fig.9 OTP Function
Soft-Start
During start-up of PWM stage, the SS pin charges an
external capacitor with a constant current source. The
voltage on FBPWM is clamped by SS voltage during
start-up. In the event of a protection condition and/or
PWM being disabled, the SS pin quickly discharges.
Gate Drivers
SG6902 output stage is a fast totem-pole gate driver. The
output driver is clamped by an internal 18V Zener diode
to protect the power MOSFET.
相關(guān)PDF資料
PDF描述
SG6902SZ Green-Mode PFC / Flyback-PWM Controller
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
SG6902SZ 功能描述:開(kāi)關(guān)變換器、穩(wěn)壓器與控制器 Grn Mode PFC/Flyback PWM Controller RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開(kāi)關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel
SG6903SZ 功能描述:開(kāi)關(guān)變換器、穩(wěn)壓器與控制器 Highly-Integrated Grn Mode PWM Cntrl RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開(kāi)關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel
SG6905 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Green mode PFC/Flyback-PWM Controller
SG6905SY 制造商:Rochester Electronics LLC 功能描述: 制造商:Fairchild Semiconductor Corporation 功能描述:
SG6905SZ 功能描述:開(kāi)關(guān)變換器、穩(wěn)壓器與控制器 Grn Mode PFC/Forward PWM Controller RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開(kāi)關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel
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