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参数资料
| 型号： | SG5841SZ |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 11/15页 |
| 文件大小： | 0K |
| 描述： | IC PWM FLYBACK ISOLATED CM 8-SOP |
| 产品变化通告： | Mold Compound Change 12/Dec/2007 |
| 标准包装： | 2,500 |
| 输出隔离： | 隔离 |
| 频率范围： | 62kHz ~ 68kHz |
| 输入电压： | 11 V ~ 24.7 V |
| 输出电压： | 18V |
| 工作温度： | -20°C ~ 85°C |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | * |
| 包装： | 带卷 (TR) |
Thermal Protection
An NTC thermistor R NTC in series with a resistor R A can
be connected from the RT pin to ground. A constant
current I RT is output from pin RT. The voltage on the RT
pin can be expressed as V RT = I RT × (R NTC + R A ), in
which I RT = 2 x (1.3V / R I ). At high ambient temperature,
R NTC is smaller, such that V RT decreases. When V RT is
less than 0.62V, the PWM is completely turned off.
Limited Power Control
The FB voltage increases every time the output of the
power supply is shorted or overloaded. If the FB voltage
remains higher than a built-in threshold for longer than
t D-OLP , PWM output is turned off. As PWM output is
turned off, the supply voltage V DD begins decreasing.
When V DD goes below the turn-off threshold (e.g. 10V)
the controller totally shuts down. V DD is charged up to
the turn-on threshold voltage of 16V through the startup
resistor until PWM output is restarted. This protection
remains activated as long as the overloading condition
persists. This prevents the power supply from
overheating due to overloading conditions.
Noise Immunity
Noise on the current-sense or control signal may cause
significant pulse-width jitter, particularly in the
continuous-conduction mode. Slope compensation
helps alleviate this problem. Good placement and
layout practices should be followed. Avoiding long PCB
traces and component leads, locating compensation
t D - OLP
(ms)
= 1 . 115 × R I (K Ω )
(2)
and filter components near SG5841/J, and increasing
power MOS gate resistance improve performance.
? 2006 Fairchild Semiconductor Corporation
SG5841J ? Rev. 1.3.5
11
www.fairchildsemi.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SG5841SZ_SB82167 | 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 |
| SG5842A | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:Highly Integrated Green-Mode PWM Controller |
| SG5842A_09 | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:Highly Integrated Green-Mode PWM Controller |
| SG5842ADZ | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:Highly Integrated Green-Mode PWM Controller |
| SG5842ASY | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:Highly Integrated Green-Mode PWM Controller |
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