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| 型号： | FAN6862TY |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 12/16页 |
| 文件大小： | 0K |
| 描述： | IC PWM CTLR GREEN MODE 6-SSOT |
| 标准包装： | 1 |
| 输出隔离： | 隔离 |
| 频率范围： | 62kHz ~ 68kHz |
| 输入电压： | 9.5 V ~ 24 V |
| 功率（瓦特）： | 300mW |
| 工作温度： | -40°C ~ 105°C |
| 封装/外壳： | SOT-23-6 |
| 供应商设备封装： | 6-SSOT |
| 包装： | 标准包装 |
| 其它名称： | FAN6862TYDKR |
Constant Output Power Limit
FAN6862 has saw-limiter for pulse-by-pulse current
limit, which guarantees almost constant power limit over
different line voltages of universal input range.
The conventional pulse-by-pulse current limiting scheme
has a constant threshold for current limit comparator,
which results in a higher power limit for high line
voltage. FAN6862 has a sawtooth current limit threshold
that increases progressively within a switching cycle,
Leading-Edge Blanking (LEB)
Each time the power MOSFET is switched on, a turn-on
spike occurs across the sense-resistor caused by
primary-side capacitance and secondary-side rectifier
reverse recovery. To avoid premature termination of the
switching pulse, a leading-edge blanking time is built in.
During this blanking period (360ns), the PWM
comparator is disabled and cannot switch off the gate
driver. Thus, RC filter with a small RC time constant is
enough for current sensing.
which provides lower current limit for high line and
makes the actual power limit level almost constant over
different line voltages of universal input range, as shown
in Figure 28.
Figure 29. Current Sense R-C Filter
Soft-Start
Figure 28. Sawtooth Current Limiter
? 2009 Fairchild Semiconductor Corporation
FAN6862 ? Rev. 1.0.3
12
The FAN6862 has an internal soft-start circuit that
increases pulse-by-pulse current-limit comparator
inverting input voltage slowly after it starts. The typical
soft-start time is 4ms. The pulsewidth to the power
MOSFET is progressively increased to establish the
correct working conditions for transformers, rectifier
diodes, and capacitors. The voltage on the output
capacitors is progressively increased with the intention
of smoothly establishing the required output voltage. It
also helps prevent transformer saturation and reduces
the stress on the secondary diode during startup.
www.fairchildsemi.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| FAN6862WLTY | 功能描述:电流型 PWM 控制器 Green 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 |
| FAN6862WRTY | 功能描述:电流型 PWM 控制器 Green 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 |
| FAN6862WTY | 功能描述:电流型 PWM 控制器 Low Power Two-Input Logic Gate TinyLogic 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 |
| FAN6863 | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:Highly Integrated Green-Mode PWM Controller |
| FAN6863FTY | 制造商:Fairchild Semiconductor Corporation 功能描述: |
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