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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 |
| 文件頁數(shù)： | 1/13頁 |
| 文件大小： | 494K |
| 代理商： | SG6846A |
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(guān)PDF資料 |
PDF描述 |
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| 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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