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參數(shù)資料
| 型號： | SG3842G |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | BiCMOS Green-Mode PWM Controllers |
| 中文描述： | BiCMOS工藝綠色模式PWM控制器 |
| 文件頁數(shù)： | 1/19頁 |
| 文件大?。?/td> | 394K |
| 代理商： | SG3842G |
Product Specification
BiCMOS Green-Mode PWM Controllers
SG3842G/ SG3843G
System General Corp.
Version 1.4 ( IRO33.0007.B3)
- 1 -
www.sg.com.tw
Jun.28,2004
FEATURES
384x series pin-to-pin compatible
Linearly decreasing PWM frequency
Burst-mode at low/zero load
5uA start-up current
5mA operating current
Vcc over voltage protection
Cycle-by-cycle current limiting
Zero cross-conduction
Slew rate controlled high current totem pole output
Fast current sense propagation delay
Under voltage lockout (UVLO) with hysteresis
APPLICATIONS
Switching mode power supplies
Power converters
DESCRIPTION
controllers combines high performance with Green-mode
power saving features. SG348xG controllers are fully
pin-to-pin compatible with bipolar UC384x devices, but
they have improved features and functionality. SG384xG
series controllers are compatible with the BiCMOS
fabrication process, enabling the use of low start-up
current and operating currents. This feature further
improves power conversion efficiency. The minimal
The SG348xG series of current-mode PWM
start-up current has been reduced to 5uA, and the
minimum operating current has been reduced to 5mA.
Each SG384xG has a slew rate controlled high current
totem pole output, ideally suited for driving a power
MOSFET while keeping EMI low.
The current-sense propagation delay is typically
50ns, resulting in significantly more effective constant
power protection. During normal operation, a SG384xG
controller acts as a fixed frequency PWM controller. The
PWM frequency can be easily programmed by changing
external R
T
and C
T
values. The SG384xG includes two
Green-mode functions that dramatically reduce power
usage, helping the power supply comply with the latest
international power saving guidelines. To cut power
consumption under light load conditions, the controller’s
Green-mode function will linearly decrease the PWM
frequency in response to decreases in the output load.
Under ultra light-load/zero-load conditions, the RT/CT
PWM oscillator periodically shuts down, and enters into
Burst-mode. This causes the IC’s supply voltage to begin
gradually dropping. Just before the supply voltage drops
below the UVLO voltage threshold, the RT/CT PWM
oscillator turns back on, to prevent the supply voltage
from going below the UVLO voltage.
SG384xG controllers also come with Over Voltage
Protection (OVP). This shuts down PWM output if the
supply voltage ever exceeds 27V. The SG384xG series
comes in 8-pin DIP and SOP
packages.
From auxiliary winding
COMP
VREF
VFB
OUTPUT
SENSE
RT/CT
GND
VCC
SG384x
R
IN
1.5M
R41
100
R42
1k
R
S
0.3
C25
100p
C21
0.1u
C
T
3.3n
Rac
10k
R
T
10k
From bridge rectifier
120~ 380VDC
C
IN
10u
Oscillator Frequency (Fosc) vs COMP Voltage
0
10
20
30
40
50
60
1
1.5
2
2.5
3
COMP VOLTAGE (V)
F
TYPICAL APPLICATION
Green-mode Operation
Oscillator Frequency vs. COMP
相關PDF資料 |
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| SG3843G | BiCMOS Green-Mode PWM Controllers |
| SG3843GAS | BiCMOS Green-Mode PWM Controllers |
| SG3842G2ASZ | BiCMOS Green-Mode PWM Controllers |
| SG3842GAD | BiCMOS Green-Mode PWM Controllers |
| SG3842GADZ | BiCMOS Green-Mode PWM Controllers |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| SG3842G2AD | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:BiCMOS Green-Mode PWM Controllers |
| SG3842G2ADZ | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:BiCMOS Green-Mode PWM Controllers |
| SG3842G2AS | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:BiCMOS Green-Mode PWM Controllers |
| SG3842G2ASZ | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:BiCMOS Green-Mode PWM Controllers |
| SG3842GAD | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:BiCMOS Green-Mode PWM Controllers |
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