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| 型号： | SG5842JADZ |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 1/15页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR FLYBK ISO PWM 8-DIP |
| 产品变化通告： | Product Discontinuation 03/Dec/2009 |
| 标准包装： | 59 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 68kHz |
| 占空比： | 70% |
| 电源电压： | 10.5 V ~ 20 V |
| 降压： | 无 |
| 升压： | 无 |
| 回扫： | 是 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 是 |
| 工作温度： | -40°C ~ 105°C |
| 封装/外壳： | 8-DIP（0.300"，7.62mm） |
| 包装： | 管件 |
December 2009
SG5842A/SG5842JA — Highly Integrated Green-Mode
PWM Controller
Features
Green-Mode PWM Controller
Low Startup Current: 14μA
Low Operating Current: 4mA
Programmable PWM Frequency with Hopping
(SG5842JA)
Peak-Current-Mode Control
Cycle-by-Cycle Current Limiting
Synchronized Slope Compensation
Leading-Edge Blanking (LEB)
Constant Output Power Limit
Totem-Pole Output with Soft Driving
V DD Over-Voltage Protection (OVP)
Programmable Over-Temperature Protection (OTP)
Internal Latch Circuit (OTP, OVP)
Internal Open-Loop Protection
V DD Under-Voltage Lockout (UVLO)
GATE Output Maximum Voltage Clamp: 18V
Applications
General-purpose switch-mode power supplies and
flyback power converters, including:
Notebook Power Adapters
Open-Frame SMPS
? 2007 Fairchild Semiconductor Corporation
SG5842A/SG5842JA ? Rev. 1.4.3
Description
The highly integrated SG5842A/JA series of PWM
controllers provides several 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 at light-load conditions. To
avoid acoustic-noise problems, the minimum PWM
frequency set above 22KHz. This green-mode function
enables the power supply to meet international power
conservation requirements. To further reduce power
consumption, SG5842A/JA is manufactured using the
BiCMOS process. This allows a low startup current,
around 14μA, and an operating current of only 4mA. As
a result, a large startup resistance can be used.
The SG5842A/JA built-in synchronized slope
compensation achieves stable peak-current-mode
control. SG5842JA integrates a frequency-hopping
function that helps reduce EMI emission of a power
supply with minimum line filters.
SG5842A/JA provides many protection functions. In
addition to cycle-by-cycle current limiting, the internal
open-loop protection circuit ensures safety should an
open-loop or output short-circuit failure occur. PWM
output is disabled until V DD drops below the UVLO lower
limit, then the controller starts again. As long as V DD
exceeds about 24V, the internal OVP circuit is triggered.
An external NTC thermistor can be applied for over-
temperature protection.
SG5842A/JA is available in an 8-pin DIP or SOP
package.
www.fairchildsemi.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SG5842JASY | 功能描述:开关变换器、稳压器与控制器 HI-INTEGRD GRN-MODE PWM CONTROLLER RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| SG5842JASZ | 功能描述:IC REG CTRLR FLYBK ISO PWM 8-SOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,500 系列:PowerWise® PWM 型:控制器 输出数:1 频率 - 最大:1MHz 占空比:95% 电源电压:2.8 V ~ 5.5 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:6-WDFN 裸露焊盘 包装:带卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名称:LM1771SSDX |
| SG5842JDSY | 功能描述:电流型 PWM 控制器 HI-INTEGRD GRN-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 |
| SG5842JDSZ | 制造商:Rochester Electronics LLC 功能描述: 制造商:Fairchild Semiconductor Corporation 功能描述: |
| SG5843SZ | 制造商:Fairchild Semiconductor Corporation 功能描述: |
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