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| 型号： | SG6846ACSY |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 1/15页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR PWM PROG GREEN OVP 8SOP |
| 产品变化通告： | Product Discontinuation 03/Dec/2009 |
| 标准包装： | 2,500 |
| 输出隔离： | 隔离 |
| 频率范围： | 47kHz ~ 130kHz |
| 输入电压： | 11.5 V ~ 20 V |
| 输出电压： | 18V |
| 功率（瓦特）： | 400mW |
| 工作温度： | -40°C ~ 105°C |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOICN |
| 包装： | 带卷 (TR) |
March 2012
SG6846A
Highly Integrated Green-Mode PWM Controller
Features
Description
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Low Startup Current: 8μA
Low Operating Current: 3.7mA
Peak-Current Mode of Operation with Cycle-by-
Cycle Current Limiting
PWM Frequency Continuously Decreasing with
Burst Mode at Light Loads
V DD Over-Voltage Protection (OVP)
AC Input Brownout Protection with Hysteresis
Constant Output Power Limit (Full AC Input Range)
Internal Latch Circuit for OVP, OTP, and OCP
Two-level OCP Delay: 1600ms
Output Short-Circuited Delay Time: 100ms
Programmable PWM Frequency with
Frequency Hopping
OCP Threshold is Half Peak Current Limit
Feedback Open-loop Protection with 1700ms Delay
Built-in Soft-Start
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 1700ms, over-current protection is
activated such that the SG6846A is latched off.
If the switching current is higher than two thirds of the
peak-current threshold for 100ms, and the voltage on
the V DD is still higher than V DD-OFF + 1V, the PWM pulses
are latched off immediately once the V DD voltage is
lower than V DD-OFF + 1V. This is useful when an output
short circuit occurs.
SG6846A also integrates a frequency-hopping function
internally to reduce 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
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
soften the stress on the MOSFET and startup current
during power on period.
Other protection functions include AC input brownout
Applications
General-purpose switch-mode power supplies and
flyback power converters, including:
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 is activated, an internal latch circuit latches off
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Power Adapters
Open-frame SMPS
SMPS with Surge-current Output, such as for
Printers, Scanners, Motor Drivers
the controller. The PWM pulses stay latched off until the
power supply is disconnected from the mains outlet.
SG6846A controller is available in 8-pin SOP package.
Ordering Information
Part Number
SG6846ALSY
SG6846ALSZ
SG6846ACSY
Operating
Temperature Range
-40 to +105°C
-40 to +105°C
-40 to +105°C
OCP
Latch
Yes
Yes
No
Package
8-Pin Small Outline Package (SOP)
8-Pin Small Outline Package (SOP)
8-Pin Small Outline Package (SOP)
Packing
Method
Tape & Reel
Tape & Reel
Tape & Reel
? 2008 Fairchild Semiconductor Corporation
SG6846A ? Rev. 1.1.5
www.fairchildsemi.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SG6846ACSZ | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:Highly Integrated Green-Mode PWM Controller |
| SG6846ALSY | 功能描述:电流型 PWM 控制器 Highly Integrated Gr Mode PWM Contrl RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| SG6846ALSZ | 功能描述:电流型 PWM 控制器 Highly-Integrated Green-Mode PWM RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| SG6846B | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:Highly Integrated Green-Mode PWM Controller |
| SG6846BCSY | 功能描述:电流型 PWM 控制器 Current Mode PWM Controller RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
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