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参数资料
| 型号： | FAN4146SX |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 5/10页 |
| 文件大小： | 0K |
| 描述： | IC CTLR LOW PWR AC GFI 6-SSOT |
| 标准包装： | 3,000 |
| 应用： | 接地故障保护 |
| 电流 - 电源： | 400µA |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SOT-23-6 细型，TSOT-23-6 |
| 供应商设备封装： | 6-SSOT |
| 包装： | 带卷 (TR) |
Functional Description
Refer to Figure 1 and Figure 3.
The FAN4146 is a two-wire GFCI controller for AC
ground-fault-circuit interrupters. The internal rectifier
circuit is biased by the AC line during the positive half
Calculation of R SET Resistor
The AmpOut signal must exceed the window
comparator’s V TH threshold voltage for longer than the
delay timer and calculated by:
cycle of the AC line voltage. The internal 12 V shunt
regulator uses a precision temperature-compensated
bandgap reference. The combination of precision
reference circuitry and precision sense amplifier
provides for an accurate ground-fault tolerance. This
V TH =I FAULT x 1.41 x R SET x C OS (2 ? x (t/2P)) / N
R SET = (V TH x N) / (1.41 x I FAULT x C OS ( ? x t/P))
(1)
(2)
allows for selection of external components with wider
and lower-cost parameter variation. Due to the low
quiescent current, a high value external series resistor
where:
V TH
= 3.5 V
=
V OS
1.5 K ?? (AC (j ? L) impedance of sense coil),
RL AC =
%Error=
(R 1 ) can be used which reduces the maximum power
wattage required for this resistor. The 12 V shunt
regulator generates the reference voltage V REF for the
sense amplifier’s (A 1 ) non-inverting input (AC ground
reference) and supplies the bias for the delay timer (t 1 ),
comparators (C 1 & C 2 ), and the SCR driver.
The secondary winding of the sense transformer is
directly DC coupled to the inverting input of the sense
amplifier at pin 5 (V FB ). The R SET resistor converts the
sense transformer’s secondary current to a voltage at
pin 6 (AmpOut). This voltage is compared to the internal
window comparator (C 1 & C 2 ) and, when the AmpOut
voltage exceeds the ±V TH threshold voltage, the window
comparator triggers the internal delay timer. The output
of the window comparator must stay HIGH for the
duration of the t 1 timer. If the window comparator’s
output momentarily goes LOW, the t 1 timer resets. If the
window comparator’s output is still HIGH at the end of
the t 1 pulse, the SCR driver enables the current source
I 1 and disables Q 1 . The current source I 1 then enables
the external SCR, which energizes the solenoid, opens
the contact switches to the load, and removes the
hazardous ground fault. The window comparator allows
detection of a positive or negative I FAULT signal
independent from the phase of the line voltage. An
internal under-voltage lockout circuit disables the SCR
driver if the voltage at pin 3 (LINE) is below 7.5 V. This
prevents the SCR from energizing the solenoid when
the SCR’s anode voltage is below 65 V.
The sense transformer typically has a toroidal core
made of laminated steel rings or solid ferrite material.
The secondary of the transformer is typically 1000 turns
of #40 wire wound through the toroid. The primary is
typically one turn made by passing the AC hot and
neutral wires through the center of the toroid. When a
ground fault exists, a difference exists between the
current flowing in hot and neutral wires. The primary
difference current divided by the primary-to-secondary
turns ratio is the current that flows through the
secondary wire of the transformer.
? 2010 Fairchild Semiconductor Corporation
FAN4146 ? Rev. 1.0.1
5
I FAULT = 5 mA (UL943B)
t = 1 ms (timer delay)
P = Period of the AC Line (1/60 Hz)
N = Ratio of secondary to primary turns (1000:1)
R SET = 505 K ???? 511 K ?? standard 1% value ?
In practice, the transformer is non-ideal, so R SET may
need to be adjusted by up to 30% to obtain the desired
I fault trip threshold.
Calculation of V OS Trip Threshold Error
Since the sense coil is directly connected to the
feedback of the sense amplifier, the V OS offset
introduces an I fault threshold error. This error can be
calculated as follows:
%Error=100 x (V OS x R SET ) / (R IN + RL DC + RL AC ) / V TH (3)
where:
±450 μV (worst case)
±150 μV (typical)
R SET = 511 K ???
R IN = 470 ? (typical value)
RL DC = 75 ? (sense coil secondary DC resistance)
L= 4 H, f= 60 Hz)
V TH = 3.5 V
± 3.2% (worst case)
± 1.1% (typical)
www.fairchildsemi.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| FAN4147 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:接地故障断路器 |
| FAN4147SX | 功能描述:电流和电力监控器、调节器 Ground Fault Interupter RoHS:否 制造商:STMicroelectronics 产品:Current Regulators 电源电压-最大:48 V 电源电压-最小:5.5 V 工作温度范围:- 40 C to + 150 C 安装风格:SMD/SMT 封装 / 箱体:HPSO-8 封装:Reel |
| FAN4174 | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:Single, Ultra-Low Cost, Rail-to-Rail I/O, CMOS Amplifier |
| FAN4174_08 | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:Single and Dual, Ultra-Low Cost, Rail-to-Rail I/O, CMOS Amplifier |
| FAN4174IP5X | 功能描述:运算放大器 - 运放 Single Ultra Low Cost RRIO CMOS RoHS:否 制造商:STMicroelectronics 通道数量:4 共模抑制比（最小值）:63 dB 输入补偿电压:1 mV 输入偏流（最大值）:10 pA 工作电源电压:2.7 V to 5.5 V 安装风格:SMD/SMT 封装 / 箱体:QFN-16 转换速度:0.89 V/us 关闭:No 输出电流:55 mA 最大工作温度:+ 125 C 封装:Reel |
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