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参数资料
| 型号： | SG6742HRSZ |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 10/13页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR PWM GREEN CM OVP 8SOP |
| 标准包装： | 1 |
| 输出隔离： | 隔离 |
| 频率范围： | 90kHz ~ 110kHz |
| 输入电压： | 10.5 V ~ 22 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-SOP |
| 包装： | 标准包装 |
| 其它名称： | SG6742HRSZDKR |
Functional Description (Continued)
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 the RT pin. The
voltage on the RT pin can be expressed as V RT = I RT ?
(R NTC + R A ), where I RT is 100μA. At high ambient
temperatures, R NTC is smaller, such that V RT decreases.
When V RT is less than 1.05V (V RTTH1 ), the PWM turns
off after 20ms (t D-OTP1 ). If V RT is less than 0.7V (V RTTH2 ),
PWM turns off immediately after 130μs (t D-OTP2 ).
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, V DD begins decreasing.
When V DD goes below the turn-off threshold (~9.5V) the
controller is totally shut down. V DD is charged up to the
turn-on threshold voltage of 15.5V through the startup
resistor until PWM output is restarted. This protection
feature continues as long as the overloading condition
Noise Immunity
Noise on the current sense or control signal may cause
significant pulse-width jitter, particularly in 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 and filter
components near the SG6742HL/HR, and increasing
the power MOS gate resistance improve performance.
persists. This prevents
the power supply from
overheating due to overloading conditions. When V RT is
less than 1.05V (V RTTH1 ), the PWM is turned off after
20ms (t D-OTP1 ). If V RT is less than 0.7V (V RTTH2 ), PWM is
turned off immediately after 130μs (t D-OTP2 ).
? 2008 Fairchild Semiconductor Corporation
SG6742HL/HR ? Rev. 1.0.4
10
www.fairchildsemi.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SG6742ML | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:Highly Integrated Green-Mode PWM Controller |
| SG6742MLSY | 功能描述:电流型 PWM 控制器 Highly Integrated Green-Mode PWM Cont. 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 |
| SG6742MR | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:Highly Integrated Green-Mode PWM Controller |
| SG6742MRSY | 功能描述:电流型 PWM 控制器 30V 68kHz Hi-Integr Grn-Mode PWM Cont. 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 |
| SG6742SY | 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 |
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