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参数资料
| 型号： | FAN6791MY |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 15/20页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR FLYBK ISO CM 16SOIC |
| 标准包装： | 2,500 |
| PWM 型： | 电流模式 |
| 输出数： | 2 |
| 频率 - 最大： | 130kHz |
| 占空比： | 49% |
| 电源电压： | 10 V ~ 22 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 ~ 85°C |
| 封装/外壳： | 16-SOIC（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
Interleave Switching
The FAN6791/3 uses interleaved switching to
synchronize the stand-by PWM / forward PWM stages.
This reduces switching noise and spreads the EMI
emissions. Figure 26 shows that an off-time t OFF is
inserted in between the turn-off of the stand-by gate
drives and the turn-on of the forward PWM.
Figure 26. Interleaved Switching
Slope Compensation
The stand-by PWM and forward PWM stage are
designed for flyback and forward power converters.
Peak-current-mode control is used to optimize system
performance. Slope compensation is added to stabilize
the current loop. The FAN6791/3 inserts a
synchronized, positively sloped ramp at each switching
cycle. The positively sloped ramp is represented by the
voltage signal V s-comp in Figure 27.
Constant Power Control
To limit the output power of the converter constantly, a
power-limit function is included. Sensing the converter
input voltage through the VRMS pin, the power limit
function generates a relative peak-current-limit threshold
voltage for constant power control, as shown in Figure 28.
Figure 28. Constant Power Control
Protections
The FAN6791/3 provides full protection functions to
prevent the power supply and the load from being
damaged. The protection features include:
V DD Over-Voltage Protection . The stand-by PWM and
forward PWM stages will be disabled whenever the V DD
voltage exceeds the over-voltage threshold.
AC Under-Voltage Protection. The VRMS pin is used to
detect the AC input voltage. When voltage is lower than
the brownout threshold, voltage disables both forward
and stand-by PWM.
RI Pin Open / Short Protection . The RI pin is used to set
the switching frequency and internal current reference.
The stand-by PWM and forward PWM stages are
disabled whenever the RI pin is short or open.
Open-Loop Protection . The stand-by PWM and forward
PWM stages of FAN6791/3 is disabled whenever the
FBFYB / FBPWM pin is open.
Figure 27. Slope Compensation
Gate Drivers
FAN6791/3 output stages are fast totem-pole gate
drivers. The output driver is clamped by an internal 18V
Zener diode to protect the power MOSFET.
? 2008 Fairchild Semiconductor Corporation
FAN6791 / FAN6793 ? Rev. 1.0.3
15
www.fairchildsemi.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| FAN6791NY | 功能描述:电流型 PWM 控制器 Highly Integratd 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 |
| FAN6793 | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:Highly Integrated,Dual-PWM Combination Controller |
| FAN6793MY | 功能描述:监控电路 Highly Intgrtd Dual PWM Combo Controller RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
| FAN6793NY | 功能描述:监控电路 Highly Intgrtd Dual PWM Combo Controller RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
| FAN6861 | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:Low-Cost, Highly Integrated, Green-Mode PWM Controller for Peak Power Management |
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