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参数资料
| 型号： | FAN6862TY |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 11/16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 |
Protections
Self-protective functions include V DD Over-Voltage
Protection (OVP), Open-Loop / Overload Protection
(OLP), Over-Current Protection (OCP), Short-Circuit
Protection, and Over-Temperature Protection (OTP).
OLP, OCP, and SCP are auto-restart mode protections;
while OVP and OTP are latch-mode protections.
Auto-Restart Mode Protection: Once a fault condition
is detected, switching is terminated and the MOSFET
remains off. This causes V DD to fall because no more
power is delivered from auxiliary winding. When V DD
falls to V DD-OFF (8.5V), the protection is reset and the
operating current reduces to startup current, which
causes V DD to rise. FAN6862 resumes normal operation
when V DD reaches V DD-ON (16V). In this manner, the
auto-restart can alternately enable and disable the
switching of the MOSFET until the fault condition is
eliminated ( see Figure 26 ).
Latch-Mode Protection: Once this protection is
triggered, switching is terminated and the MOSFET
remains off. The latch is reset only when V DD is
discharged below 4V by unplugging AC power line.
Open-Loop / Over-Load Protection (OLP)
When the upper branch of the voltage divider for the
shunt regulator (KA431 shown) is broken, as shown in
Figure 27, no current flows through the opto-coupler
transistor, which pulls up the feedback voltage to 5.2V.
When the feedback voltage is above 4.6V longer than
56ms, OLP is triggered. This protection is also triggered
when the SMPS output drops below the nominal value
longer than 56ms due to the overload condition.
V FB
OLP Shutdown Delay Time
5.2V
V FB-OLP (4.6V)
OLP Triggers
Figure 27. OLP Operation
V DD Over-Voltage Protection (OVP)
V DD over-voltage protection prevents IC damage caused
by over voltage on the V DD pin. The OVP is triggered
when V DD reaches 25V. A debounce time (typically
30μs) prevents false triggering by switching noise.
Over-Temperature Protection (OTP)
The OTP circuit is composed of current source and
voltage comparators. Typically, an NTC thermistor is
connected between the RT and GND pins. Once the
voltage of this pin drops below a threshold of 1.0V,
Figure 26. Auto Restart Operation
Over-Current Protection (OCP)
FAN6862 has over-current protection thresholds. It is for
pulse-by-pulse current limit, which turns off MOSFET for
the remainder of the switching cycle when the sensing
voltage of MOSFET drain current reaches the threshold.
The other threshold is for the over-current protection,
which shuts down the MOSFET gate when the sensing
voltage of MOSFET drain current is above the threshold
longer than the shutdown delay (56ms).
? 2009 Fairchild Semiconductor Corporation
FAN6862 ? Rev. 1.0.3
11
PWM output is disabled after t DOTP debounce time. If this
pin drops below 0.7V, it triggers the latch-off protection
immediately after t DOTP2 debounce time.
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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