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參數(shù)資料
| 型號(hào)： | SG6846A |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | Highly Integrated Green-Mode PWM Controller |
| 中文描述： | 高度集成的綠色模式PWM控制器 |
| 文件頁(yè)數(shù)： | 2/13頁(yè) |
| 文件大?。?/td> | 494K |
| 代理商： | SG6846A |
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Product Specification
Highly Integrated Green-Mode PWM Controller
SG6846A
System General Corp.
Version 1.1.1 (IAO33.0059.B1)
- 2 -
www.sg.com.tw www.fairchildsemi.com
September 26, 2007
MARKING DIAGRAMS PIN CONFIGURATION
ORDERING INFORMATION
Part Number
OCP Latch
Pb-Free
Package
SG6846ALSZ
Yes
8-Pin SOP
SG6846ACSZ (Preliminary)
No
8-Pin SOP
PIN DESCRIPTIONS
Pin No. Symbol
Function
Description
1
GND
Ground
Ground.
2
FB
Feedback
The signal from the external compensation circuit is fed into this pin. The PWM duty cycle is
determined in response to the signal from this pin and the current-sense signal from Pin 6.
3
VIN
Line-voltage
Detection
Line-voltage detection. The line-voltage detection is used for brownout protection with
hysteresis. Constant output power limit over a universal AC input range is also achieved using
this VIN pin. Consider adding a low-pass filter to filter out line ripple on the bulk capacitor.
4
RI
Reference
Setting
A resistor from the RI pin to ground generates a reference current source that determines the
switching frequency. Increasing the resistance reduces the switching frequency. Using a
26k
resistor results in a 65kHz switching frequency.
5
RT
Temperature
Detection
For over-temperature protection, an external NTC thermistor is connected from this pin to the
GND pin. The impedance of the NTC decreases at high temperatures. Once the voltage of the
RT pin drops below a threshold, PWM output is disabled.
6
SENSE
Current Sense
Current sense. The sensed voltage is used for peak-current-mode control and cycle-by-cycle
current limiting. If the switching current is higher than two thirds of the peak-current threshold
for longer than 100ms and V
is higher than 12V and lasts for 1700ms, over-current
protection is activated. If an output short over-current also occurs and lasts for 100ms and
V
AUX
is lower than 12V, SG6846A turns off immediately. This two-level OCP feature is
especially suitable for SMPS with surge current output. It also has built-in 5ms soft-start time
as switching frequency operates at 65KHz.
7
VDD
Power Supply
Power supply. If an open-circuit failure occurs in the feedback loop, the internal protection
circuit disables PWM output as long as V
DD
exceeds the threshold.
8
GATE
Driver Output
The totem-pole output driver for the power MOSFET, internally clamped below 18V.
F:
L=OCP Latch, C=OCP
auto-recovery
T
: S=SOP
P :
Z=Lead Free
Null=regular package
XXXXXXXX
: Wafer Lot
Y
: Year;
WW
: Week
V
: Assembly Location
GATE
VDD
GND
FB
SG6846AFTP
XXXXXXXXYWWV
VIN
SENSE
RI
RT
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SG6846ACSZ | Highly Integrated Green-Mode PWM Controller |
| SG6846ALSZ | Highly Integrated Green-Mode PWM Controller |
| SG6858 | Low-Cost, Green-Mode PWM Controller for Flyback Converters |
| SG6858DZ | Low-Cost, Green-Mode PWM Controller for Flyback Converters |
| SG6858TZ | Low-Cost, Green-Mode PWM Controller for Flyback Converters |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SG6846A_08 | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Highly Integrated Green-Mode PWM Controller |
| SG6846ACSY | 功能描述:電流型 PWM 控制器 Highly Integrated Gr Mode PWM Contrl RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| SG6846ACSZ | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Highly Integrated Green-Mode PWM Controller |
| SG6846ALSY | 功能描述:電流型 PWM 控制器 Highly Integrated Gr Mode PWM Contrl RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| SG6846ALSZ | 功能描述:電流型 PWM 控制器 Highly-Integrated Green-Mode PWM RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
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