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參數資料
型號: SG6846ACSZ
廠商: FAIRCHILD SEMICONDUCTOR CORP
元件分類: 穩壓器
英文描述: Highly Integrated Green-Mode PWM Controller
中文描述: SWITCHING CONTROLLER, 136 kHz SWITCHING FREQ-MAX, PDSO8
封裝: LEAD FREE, SOP-8
文件頁數: 1/13頁
文件大?。?/td> 494K
代理商: SG6846ACSZ
Product Specification
Highly Integrated Green-Mode PWM Controller
SG6846A
System General Corp.
Version 1.1.1 (IAO33.0059.B1)
- 1 -
www.sg.com.tw www.fairchildsemi.com
September 26, 2007
FEATURES
Two-level OCP with 1700ms delay time
Output short-circuited delay time: 100ms
Low start-up current (8μA)
Low operating current (3.7mA)
Peak-current mode operation with cycle-by-cycle
current limiting
Programmable PWM frequency with frequency
hopping
PWM frequency continuously decreasing with burst
mode at light loads
V
DD
over-voltage protection (OVP)
AC input brownout protection with hysteresis and
constant output power limit
Constant output power limit (full AC input range)
Internal latch circuit for OVP, OTP, and OCP
Built-in soft-start
Open-loop protection with 1700ms delay time
APPLICATIONS
General-purpose switch-mode power supplies and
flyback power converters, including:
Power adapters
Open-frame SMPS
Specifically fit for SMPS with surge-current output
(such as for printers, scanners, motor drivers, etc.)
DESCRIPTION
The highly integrated SG6846A series of PWM
controllers provides features to enhance the performance
of flyback converters. To minimize standby power
consumption, a proprietary green-mode function provides
off-time modulation to continuously decrease the
switching frequency under light-load conditions. Under
zero-load conditions, the power supply enters burst-mode.
The SG6846A is especially designed for SMPS with
surge-current output, incorporated with a two-level OCP
function. Besides the cycle-by-cycle current limiting, if
the switching current is higher than two thirds the
peak-current
threshold
for
protection is activated and the SG6846A latches off.
1700ms,
over-current
If the switching current is higher than two thirds the
peak-current threshold for 100ms and the voltage on the
VDD pin is higher than V
DD-OFF
+ 1V, the PWM pulses
are latched off immediately once V
DD
voltage is lower
than V
DD-OFF
+ 1V; useful if an output short-circuit occurs.
SG6846A also integrates a frequency hopping function
that reduces EMI emission of a power supply with
minimum line filters. Its built-in synchronized slope
compensation provides proprietary internal compensation
for constant output power limit over a universal AC input
range. Also, the gate output is clamped at 18V to protect
the external MOSFET from over-voltage damage.
Internal soft-start is built-in to reduce stress on the
MOSFET and start-up current during power-on period.
Other protection functions include: AC input brownout
protection with hysteresis, V
DD
over-voltage protection,
and over-temperature protection. For over-temperature
protection, an external NTC thermistor can be applied to
sense the ambient temperature. When OCP, V
DD
OVP, or
OTP are activated, an internal latch circuit is used to
latch-off the controller. The PWM pulses stay latched off
until the power supply is unplugged from the main outlet.
SG6846A is available in an 8-pin SOP package.
TYPICAL APPLICATION
相關PDF資料
PDF描述
SG6846ALSZ Highly Integrated Green-Mode PWM Controller
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SG6858DZ Low-Cost, Green-Mode PWM Controller for Flyback Converters
SG6858TZ Low-Cost, Green-Mode PWM Controller for Flyback Converters
SG6859 Low Cost Green-Mode PWM Controller for Flyback Converters
相關代理商/技術參數
參數描述
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 開關頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數量:1 最大工作溫度:+ 105 C 安裝風格: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 開關頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14
SG6846B 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Highly Integrated Green-Mode PWM Controller
SG6846BCSY 功能描述:電流型 PWM 控制器 Current Mode PWM Controller RoHS:否 制造商:Texas Instruments 開關頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14
SG6846BCSZ 功能描述:IC CTRLR PWM PROG OVP OTP 8SOP RoHS:是 類別:集成電路 (IC) >> PMIC - AC-DC 轉換器,離線開關 系列:- 標準包裝:3,000 系列:- 輸出隔離:隔離 頻率范圍:61kHz ~ 71kHz 輸入電壓:9.4 V ~ 28 V 輸出電壓:12V 功率(瓦特):- 工作溫度:-40°C ~ 125°C 封裝/外殼:SC-74,SOT-457 供應商設備封裝:6-TSOP 包裝:帶卷 (TR)
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