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参数资料
| 型号： | FAN6863WTY |
| 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： | 60kHz ~ 68kHz |
| 输入电压： | 7.5 V ~ 20 V |
| 输出电压： | 13.5V |
| 工作温度： | -40°C ~ 105°C |
| 封装/外壳： | SOT-23-6 细型，TSOT-23-6 |
| 供应商设备封装： | 6-SSOT |
| 包装： | 标准包装 |
| 其它名称： | FAN6863WTYDKR |
Protections
Self-protective functions include V DD Over-Voltage
Protection (OVP), Open-Loop / Overload Protection
(OLP), Over-Current Protection (OCP), Short-Circuit
Protection (SCP), SENSE pin Short-Circuit Protection
(SSCP), and Over-Temperature Protection (OTP). All
the self-protective functions in FAN6863WR are Auto-
Restart Mode protections. In FAN6863WL all are Latch-
Mode protections, expect SSCP, which is Auto-Restart.
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 (7 V), the
protection is reset and the operating current reduces to
Open-Loop / Overload Protection (OLP)
When the upper branch of the voltage divider for the
shunt regulator (KA431 shown in Figure 29) is broken,
no current flows through the photo-coupler transistor,
which pulls up the feedback voltage to 5.4 V.
When feedback voltage is above 4.6 V for longer than
60 ms, OLP is triggered. This protection is also triggered
when the SMPS output drops below the nominal value
for longer than 60 ms due to the overload condition.
If the secondary output-short situation occurs when the
feedback voltage is above 4.6 V, protection time is 7 ms
for shorter debounce time.
the startup current, which causes V DD to rise. Normal
operation resumes when V DD reaches V DD-ON (16 V). In
this manner, the Auto-Restart can alternately enable
and disable the switching of the MOSFET until the fault
condition is eliminated ( see Figure 28 ).
Figure 29. 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 22.2 V. A debounce time (typically
50 μs) prevents false triggering by switching noise.
Figure 28. Auto Restart Operation
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 4 V by unplugging the
AC power line.
Over-Current Protection (OCP)
The over-current protection threshold is a pulse-by-
pulse current-limit threshold (V LIMIT ), which turns off the
MOSFET once the sensing voltage of the MOSFET
drain current reaches the threshold. The V LIMIT
compensates the power-limit variation over the universal
input range and adaptively keeps the power limit
substantially constant.
? 2011 Fairchild Semiconductor Corporation
FAN6863W ? Rev. 1.0.2
12
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. If the voltage
of this pin drops below a threshold of 1.0 V, PWM output
is disabled after t DOTP debounce time. If this pin voltage
drops below 0.7 V, it triggers the latch-off protection
immediately after t DOTP2 debounce time.
www.fairchildsemi.com
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| FAN6921 | 制造商:Fairchild Semiconductor Corporation 功能描述: |
| FAN6921AMLMY | 功能描述:电流型 PWM 控制器 PFC/Quasi-Resonant 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 |
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