FAN4147 接地故障断路器 产品特性 说明 FAN4147为低功率接地故障断路器（GFI）控制器，用于 检测危险的接地路径以及接地对零线故障。FAN4147的 应用电路可以在危险的电击前断开负载。 应用于GFCI和RCD 精密感应放大器与带隙基准 内置交流整流器 内置噪声滤波器 低压晶闸管禁用 直接直流耦合至感应线圈 晶闸管门极驱动器 可调敏感度 400 A静态电流 最少外部器件 满足UL 943B要求 适合120V 或 220V系统 空间节省的SuperSOT™6引脚封装 适用范围 FAN4147内部包含一个二极管整流器、高精度12V带隙并 联稳压器、精密的低VOS失调感应放大器、延时噪声滤波 器、窗口检测比较器和一个晶闸管驱动器。通过最少数目 的外部器件，FAN4147侦测并防护火线对地故障和零线对 负载短路。器件数量最少以及小型SuperSOT™封装，使 得FAN4147成为超小型、低成本的应用解决方案。 FAN4147电路包含一个内置整流器和并联稳压器，只需 较低的静态电流，允许使用高值、低功率系列电阻。内置 温度补偿的并联稳压器、感应放大器以及偏置电路提供高 精度对地故障检测。低VOS失调感应放大器允许感应线圈 直接耦合到放大器的反馈信号端，无需大容量的50/60Hz 交流耦合电容。内置的延时滤波器能够滤除感性负载中的 高频噪声尖峰，减少了虚假有害触发。内置的晶闸管驱动 器具有温度补偿，该设计可以满足在宽范围内选择外部晶 闸管的电流要求。 外部元件数量最少以及6引脚SuperSOT™封装带来了低 成本、紧凑设计和布局。 GFCI输出接口 GFCI电路断路器 便携式GFCI线路 订购信息 器件型号 工作温度范围 封装 包装方法 FAN4147SX -35°C至85°C 6-Lead SUPERSOT6, JEDEC MO-193, 1.6mm 卷带 © 2010 Fairchild Semiconductor Corporation FAN4147 • Rev. 1.0.1 www.fairchildsemi.com FAN4147 — Ground Fault Interrupter August 2011 AMPOUT VS C1 VFB VREF I1 SCR A1 Delay T1 SCR Driver Q1 R1 VTH C2 VS VREF VTH 图1. Neutral Rectifier and Bias VREF Line FAN4147 — Ground Fault Interrupter 框图 框图 典型应用 TEST RTEST Neutral Coil 1:200 Sense Coil 1:1000 Load Hot Line Hot Load Neutral Line Neutral C2 RIN Q1 C1 Neutral C4 R1 Line FAN4147 SCR AmpOut Solenoid C3 MOV RSET VFB VREF 典型应用(1) 图2. 典型值 R1: 91K RSET: 511K RTEST: 15KΩ RIN: 470Ω (2) C1: 22nF C3=1nF C2: 10nF C4=10nF 注意: 1. 联系飞兆半导体，了解最佳应用实践，抑制有害触发。 2. 精确值取决于感应线圈特性和应用。 © 2010 Fairchild Semiconductor Corporation FAN4147 • Rev. 1.0.1 www.fairchildsemi.com 2 SC 1 PI 1 6 AmpOut Neutral 2 5 VF Line 3 4 VRE 图3. 引脚布局 FAN4147 — Ground Fault Interrupter 引脚布局 引脚说明 引脚号 名称 说明 1 SCR 2 Neutral FAN4147电路的电源零线输入 3 Line FAN4147电路的电源火线输入 4 VREF 电流感应放大器的非反相输入 5 VFB 6 AmpOut 外部晶闸管的门极驱动 电流感应放大器的反相输入 VFB引脚上连接一个外部电阻，设置 Ifault 灵敏度阈值 © 2010 Fairchild Semiconductor Corporation FAN4147 • Rev. 1.0.1 www.fairchildsemi.com 3 如果应力超过绝对最大额定值，设备就会毁损。在推荐的工作条件之上，该设备可能无法正常运行或操作，且不建议让 设备在这些条件下长期工作。此外，过度暴露在高于推荐的工作条件下，会影响器件的可靠性。绝对最大额定值仅是额 定应力值。 符号 ICC VCC TSTG ESD 参数 最小值 最大值 单位 15 mA 连续电流，火线到零线 连续电压，火线到零线 -1.2 16 V 连续电压到零线，所有其他引脚 -0.8 15 V 存储温度范围 -65 +150 °C 静电放电防护等级 人体模式，JESD22-A114 2.5 带电设备模式，JESD22-C101 1.0 机械模式，JESD22-A115 0.2 kV FAN4147 — Ground Fault Interrupter 绝对最大额定值 推荐工作条件 推荐的操作条件表定义了真实设备的工作条件。指定推荐的工作条件，以确保设备的最佳性能达到数据表中的规格。飞 兆半导体建议不超过推荐的工作条件，或将绝对最大额定值设计为工作条件。（若无其他指定要求，请参考图2。） 符号 参数 工作条件 最小值 典型值 电源到零线 12.2 12.7 电源到零线, Ishunt=-2mA -0.9 -0.7 最大值 单位 直流电气特性（TA=25°C，Ishunt=1mA） VREG 电源并联稳压器电压 13.2 V V IQ 静态电流 电源到零线=10V 350 400 450 µA VREF 参考电压 VREF 到零线 5.8 6.0 6.2 V VTH 触发阈值 AmpOut 到 VREF 3.4 3.5 3.6 V VOS 放大器偏置 RSET=511KΩ, RIN=500Ω -450 0 450 µV (0) 设计值 -50 0 50 nA 放大器直流增益 ( (0) 设计值 100 dB fGBW 放大器增益带宽 (0) 设计值 1.5 MHz VSW+ 放大器正电压摆幅 AmpOut 到 VREF, IFAULT=10µA 4.0 V VSW- 放大器负电压摆幅 VREF到AmpOut, IFAULT=10µA 4.0 V ISINK 放大器电流槽 AmpOut=VREF + 3V, VFB=VREF + 100mV 400 µA ISRL 放大器电流源 AmpOut=VREF – 3V, VFB=VREF - 100mV 400 µA 延时滤波器 从C1触发到晶闸管的时延从低到高 0.7 ROUT SCR输出电阻 SCR－零线=250mV, AmpOut=VREF VOUT SCR输出电压 IOUT SCR输出电流 IOS G td 放大器输入偏置 SCR－零线, AmpOut=VREF SCR－零线, AmpOut=VREF+4V 2.5 SCR－零线=1V AmpOut=VREF + 4V 350 1.0 1.3 ms 0.5 1.0 K 1 10 mV V 500 µA 说明： 3. 由设计保证；未经产品测试。 © 2010 Fairchild Semiconductor Corporation FAN4147 • Rev. 1.0.1 www.fairchildsemi.com 4 （参考图 1和图 2）。 接地零线侦测的灵敏度随零线线圈匝数和C2, C3值而变 化。 FAN4147为GFCI控制器，专门用于交流接地故障断路 器。在交流电源的正半周，内置整流器整流。内置12V并 联稳压器采用了精密温度补偿带隙基准。精密的基准电路 与精密的感应放大器的组合，提供了精确的接地故障容 差。使外部元件的参数选择范围更广泛和更低廉。由于所 需静态电流较低，可以采用高值的外部串联电阻 （R1 ），大大降低功耗。12V并联稳压器为感应放大器 （A1）的非反相输入端（AC接地参考）提供参考电压， 并且给延时定时器（T1）、比较器（C1 & C2）和晶闸管 驱动器提供偏压。 RSET 电阻的计算 AmpOut的信号必须超过窗口比较器的阈值电压VTH ，持 续时间超过延时定时器时间。因此： VTH=IFAULT x 1.41 x RSET x COS(2 x (t/2P)) / N (1) RSET=(VTH x N) / (1.41 x IFAULT x COS( x t/P)) (2) 其中： 感应变压器的次级绕组连接至引脚4（VREF），电阻RIN直 接直流耦合到感应放大器的反相输入端引脚5（VFB ）。 反馈电阻RSET 将感应变压器的次级绕组电流在引脚 6 (AmpOut)处转换成电压。该电压与内置窗口比较器（C1 和C2 ）进行比较，如果AmpOut的电压超过阈值电压+/VTH，窗口比较器就会触发内部延时定时器。窗口比较器 的输出必须在定时器t1时段保持高电平。如果窗口比较器 的输出为低电平，内置延时定时器将开始复位。如果在t1 脉冲结束时，窗口比较器输出一直为高电平，则晶闸管驱 动器启动电流源I1，禁止Q1。然后电流源I1开启外部晶闸 管，给电磁阀通电，打开连接负载的接触开关，从而消除 有害接地故障。窗口比较器允许检测正的或负的IFAULT 信 号，不依赖于电源电压的相位。 VTH = 3.5V ; IFAUL = 5mA (UL943) ; t = 1ms（定时器延时）； P = 交流电源周期(1/60Hz)； N = 次级与初级匝比(1000:1) RSET = 505K（511K标准 1%） 感应变压器通常都有一个由复合钢环或者固体铁氧体制成 的环形磁芯。一般情况下，变压器次级要求由40#线在该 环形磁芯上绕800匝至1500匝。变压器初级通常为一到两 匝，交流火线和零线穿过该环形磁芯中央。当接地故障出 现时，流入火线与零线的电流出现偏差。通过将初级差动 电流除以初级与次级之间的匝比就可得到了变压器的次级 电流。 由于感应线圈直接连接到感应放大器的反馈端，VOS偏置 会引入一个Ifault阈值误差。误差的计算方法为： T 说明： 4. 在实际中，由于变压器不理想，需要调节RSET，范 围高达30%，才能获得所需的Ifault触发阈值 VOS触发阈值误差的计算 %Error= 100 x (VOS x RSET) / (RIN + RLDC + RLAC) / VTH (3) where: VOS = +/-450V（最坏情况）； = +/-150V（典型值）； 零线在零线负载侧接地时出现接地零线故障。 根据接地零线的阻抗，该故障令感应线圈侦测到更低的接 地故障电流。地对负载对零线故障的侦测应根据正向反馈 原理。出现这种情况时，感应和零线线圈双向耦合，可以 在感应放大器周围产生正向反馈路径。这种正向反馈使得 感应放大器出现共振。峰值共振电压超过晶闸管触发阈值 时，将启用内置延时定时器。由于放大器输出信号跨越窗 口比较器的触发阈值的典型值为6kHz，延迟定时器将在故 障/无故障侦测之间转换。如果启用了晶闸管驱动器，可 确定故障/无故障侦测时间延迟。 © 2010 Fairchild Semiconductor Corporation FAN4147 • Rev. 1.0.1 FAN4147 — Ground Fault Interrupter 功能说明 RSET = 511K RIN = 470（典型值）； RLDC = 75（感性线圈次级直流电阻）； RLAC = 1.5 K（AC(jL) 感应线圈阻抗） （L= 4H，f= 60Hz）； VTH = 3.5V; %Error = +/- 3.2%（最差情况）；+/- -1.1% （典型值） www.fairchildsemi.com 5 若无其他说明，所有值都是在TA=25°C, 晶闸管断开（根据图2）情况下得到。 在VAC正半周，将电源（引脚3） 钳位于12.7V 通道1：电源（引脚3） 10V/Div 通道2：AmpOut（引脚6） 10V/Div 通道3：VREF（引脚4） 10V/Div 通道4：VAC输入，200V/Div 图4. FAN4147 — Ground Fault Interrupter 典型性能特征 无接地故障时典型波形 IFault 信号的方向 IFault = (VAmpout – VREF)•N/RSET 通道1：Line (引脚3) 10V/Div 通道2：AmpOut (引脚6) 5V/Div 通道3：SCR (引脚1) 1V/Div 通道4：IFault 10mA/Div 图5. © 2010 Fairchild Semiconductor Corporation FAN4147 • Rev. 1.0.1 4mA接地故障时典型波形 www.fairchildsemi.com 6 若无其他说明，所有值都是在TA=25°C, 晶闸管断开（根据图2）情况下得到。 SCR 输出触发 通道1：Line (引脚 3) 10V/Div 通道2：AmpOut (引脚6) 5V/Div 通道3：SCR (引脚1) 1V/Div 通道4：IFault 10mA/Div 图6. FAN4147 — Ground Fault Interrupter 典型性能特征 5mA接地故障时典型波形 SCR 输出触发 通道1：Line (引脚3) 10V/Div 通道2：AmpOut (引脚6) 5V/Div 通道3：SCR (引脚1) 1V/Div 通道4：IFault 10mA/Div 图7. © 2010 Fairchild Semiconductor Corporation FAN4147 • Rev. 1.0.1 5mA接地故障时典型波形（线路极性反转） www.fairchildsemi.com 7 若无其他说明，所有值都是在TA=25°C, 晶闸管断开（根据图2）情况下得到。 2Ω 接地零线故障时发生感应放大 器共振 通道1：Line (Pin 3) 10V/Div 通道2：AmpOut (Pin 6) 5V/Div 通道3：SCR (Pin 1) 1V/Div 图8. FAN4147 — Ground Fault Interrupter 典型性能特征 接地火线检测的典型波形 ~6.9KHz Sense Amplifier Oscillation Ch2: AmpOut (Pin 6) 2V/Div 图9. © 2010 Fairchild Semiconductor Corporation FAN4147 • Rev. 1.0.1 接地火线检测的典型波形 www.fairchildsemi.com 8 FAN4147 — Ground Fault Interrupter 物理尺寸 图10. 6-Lead SUPERSOT™ 封装图纸是作为一项服务，提供给考虑飞兆半导体产品的客户。具体参数可进行改动，且无需做出相应通知。请注意图纸上的版本和/ 或日期，并联系飞兆半导体代表核实或获得最新版本。请注意图纸上的版本和/或日期，并联系飞兆半导体代表核实或获得最新版本。 即时访问飞兆半导体在线封装网页，可以获得最新的封装图： http://www.fairchildsemi.com/packaging/. © 2010 Fairchild Semiconductor Corporation FAN4147 • Rev. 1.0.1 www.fairchildsemi.com 9 FAN4147 — Ground Fault Interrupter © 2010 Fairchild Semiconductor Corporation FAN4147 • Rev. 1.0.1 www.fairchildsemi.com 10 FAN4147 Ground Fault Interrupter Features Description The FAN4147 is a low-power Ground Fault Interrupter (GFI) controller for detecting hazardous current paths to ground and ground-to-neutral faults. The FAN4147 application circuit opens the load contacts before a harmful shock occurs. For GFCI and RCD Applications Precision Sense Amplifier and Bandgap Reference Built-in AC Rectifier Built-in Noise Filter Low-Voltage SCR Disable Direct DC Coupled to Sense Coil SCR Gate Driver Adjustable Sensitivity 400μA Quiescent Current Minimum External Components Meets UL 943 Requirements Ideal for 120V or 220V Systems Space Saving SuperSOT™ 6-Pin Package Applications GFCI Output Receptacles GFCI Circuit Breakers Portable GFCI Cords Internally, the FAN4147 contains a diode rectifier, precision bandgap 12V shunt regulator, precision lowVOS offset-sense amplifier, time delay noise filter, window-detection comparators, and an SCR driver. With a minimum number of external components, the FAN4147 detects and protects against a hot-wire-toground fault and a neutral-line-to-neutral-load short. The minimal components and the small SuperSOT™ package allow for a small-form-factor, low-cost solution. The FAN4147 circuitry has a built-in rectifier and shunt regulator that operates with a low quiescent current. This allows for a high-value, low-wattage-series supply resistor. The internal temperature-compensated shunt regulator, sense amplifier, and bias circuitry provide for precision ground-fault detection. The low-VOS offsetsense amplifier allows direct coupling of the sense coil to the amplifier’s feedback signal. This eliminates the large 50/60Hz AC-coupling capacitor. The internal delay filter rejects high-frequency noise spikes common with inductive loads. This decreases false nuisance tripping. The internal SCR driver is temperature compensated and designed to satisfy the current requirements for a wide selection of external SCRs. The minimum number of external components and the 6-pin SuperSOT™ package enable a low-cost, compact design and layout. Ordering Information Part Number Operating Temperature Range Package Packing Method FAN4147SX -35°C to +85°C 6-Lead SUPERSOT6, JEDEC M0-193, 1.6mm Tape and Reel © 2010 Fairchild Semiconductor Corporation FAN4147 • Rev. 1.0.1 www.fairchildsemi.com FAN4147 — Ground Fault Interrupter September 2010 AMPOUT VS C1 VFB VREF I1 SCR A1 Delay SCR Driver T1 Q1 R1 VTH C2 VREF VS Neutral Rectifier and Bias VREF VTH Line FAN4147 — Ground Fault Interrupter Block Diagram Figure 1. Block Diagram Typical Application Solenoid FAN4147 (1) Figure 2. Typical Application Typical Values R1: 91KΩ RSET: 511KΩ RTEST: 15KΩ RIN: 470Ω (2) C1: 22nF C3=1nF C2: 10nF C4=10nF Notes: 1. Contact Fairchild for best application practices for nuisance tripping rejection. 2. Exact values depend on sense coil characteristics and application. © 2010 Fairchild Semiconductor Corporation FAN4147 • Rev. 1.0.1 www.fairchildsemi.com 2 6 AmpOut 2 5 VFB 3 4 VREF SCR 1 Neutral Line PIN 1 Figure 3. Pin Configuration FAN4147 — Ground Fault Interrupter Pin Configuration Pin Definitions Pin # Name Description 1 SCR 2 Neutral Supply input for FAN4147 circuitry 3 Line Supply input for FAN4147 circuitry 4 VREF 5 VFB 6 AmpOut Gate drive for external SCR Non-inverting input for current-sense amplifier Inverting input for current-sense amplifier An external resistor connected to the VFB pin sets the Ifault sensitivity threshold © 2010 Fairchild Semiconductor Corporation FAN4147 • Rev. 1.0.1 www.fairchildsemi.com 3 Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be operable above the recommended operating conditions and stressing the parts to these levels is not recommended. In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability. The absolute maximum ratings are stress ratings only. Symbol ICC Parameter Min. Continuous Supply Current, Line to Neutral Max. Unit 15 mA Continuous Supply Voltage, Line to Neutral -1.2 16 V Continuous Voltage to Neutral, All Other Pins -0.8 15 V TSTG Storage Temperature Range -65 +150 °C ESD Electrostatic Discharge Protection Level VCC Human Body Model, JESD22-A114 2.5 Charged Device Model, JESD22-C101 1.0 Machine Model, JESD22-A115 0.2 kV FAN4147 — Ground Fault Interrupter Absolute Maximum Ratings Recommended Operating Conditions The Recommended Operating Conditions define conditions for actual device operation. Recommended operating conditions are specified to ensure optimal performance to the datasheet specifications. Fairchild does not recommend exceeding them or designing to Absolute Maximum Ratings. (Unless otherwise specified, refer to figure 2.) Symbol Parameter Conditions Min. Typ. Max. Unit Line to Neutral 12.2 12.7 13.2 V Line to Neutral Ishunt=-2mA -0.9 -0.7 DC Electrical Parameters (TA=25°C, Ishunt=1mA) VREG Power Supply Shunt Regulator Voltage V IQ Quiescent Current Line to Neutral=10V 350 400 450 µA VREF Reference Voltage VREF to Neutral 5.8 6.0 6.2 V VTH Trip Threshold AmpOut to VREF 3.4 3.5 3.6 V VOS Amplifier Offset IOS Amplifier Input Offset G Amplifier DC Gain (3) (3) (3) Gain=1000 -450 0 450 µV Design Value -50 0 50 nA Design Value 100 dB Design Value 1.5 MHz fGBW Amplifier Gain Bandwidth VSW+ Amplifier Positive Voltage Swing AmpOut to VREF, IFAULT=10μA 4.0 V VSW- Amplifier Negative Voltage Swing VREF to AmpOut, IFAULT=-10μA 4.0 V ISINK Amplifier Current Sink AmpOut=VREF + 3V, VFB=VREF + 100mV 400 µA ISRL Amplifier Current Source AmpOut=VREF – 3V, VFB=VREF - 100mV 400 µA Delay Filter Delay from C1 trip to SCR L->H 0.7 ROUT SCR Output Resistance SCR to Neutral=250mV, AmpOut=VREF VOUT SCR Output Voltage td SCR to Neutral AmpOut=VREF IOUT SCR Output Current SCR to Neutral AmpOut=VREF +4V 2.5 SCR to Neutral=1V, AmpOut=VREF + 4V 350 1.0 1.3 ms 0.5 1.0 KΩ 1 10 mV V 500 µA Note: 3. Guaranteed by design; not tested in production. © 2010 Fairchild Semiconductor Corporation FAN4147 • Rev. 1.0.1 www.fairchildsemi.com 4 oscillate. When the peak oscillation voltage exceeds the SCR trigger threshold, the internal delay timer is enabled. Since the amplifier’s output signal is crossing the window comparator’s trip threshold typically at 6KHz, the delay timer alternates between detection of a fault/no fault. The ratio of the fault/no-fault detection time interval determines if the SCR driver is enabled. (Refer to Figure 1 and Figure 2.) The FAN4147 is a GFCI controller for AC ground-fault circuit interrupters. The internal rectifier circuit is supplied from the AC line during the positive half cycle of the AC line voltage. The internal 12V 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 allows for selection of external components with wider, lower-cost, parameter variations. Due to the low quiescent current, a high-value external series resistor (R1) can be used, which reduces the maximum power wattage required. The 12V shunt regulator generates the reference voltage for the sense amplifier’s (A1) non-inverting input (AC ground reference) and supplies the bias for the delay timer (T1), comparators (C1 & C2), and SCR driver. The sensitivity of the grounded neutral detection is changed by the neutral coil turns and C2, C3 values. RSET Resistor Calculation The AmpOut signal must exceed the window comparator’s VTH threshold voltage for longer than the delay timer. Therefore: The secondary winding of the sense transformer is connected to pin 4 (VREF) and to a resistor RIN directly DC connected to the inverting input of the sense amplifier at pin 5 (VFB). The feedback resistor (RSET) converts the sense transformer’s secondary current to a voltage at pin 6 (AmpOut). This voltage is compared to the internal window comparator (C1 & C2) and, when the AmpOut voltage exceeds the +/-VTH threshold voltage, the window comparator triggers the internal delay timer. The output of the window comparator must stay HIGH for the duration of the t1 timer. If the window comparator’s output goes LOW, the internal delay timer starts a reset cycle. If the window comparator’s output is still HIGH at the end of the t1 pulse, the SCR driver enables the current source I1 and disables Q1. The current source I1 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 for detection of a positive or negative IFAULT signal independent from the phase of the line voltage. VTH=IFAULT x 1.41 x RSET x COS(2π x (t/2P)) / N (1) RSET=(VTH x N) / (1.41 x IFAULT x COS(π x t/P)) (2) where: VTH = 3.5V ; IFAULT = 5mA (UL943) ; t = 1ms (timer delay); P = Period of the AC Line (1/60Hz); N = Ratio of secondary to primary turns (1000:1); RSET = 505KΩ (511KΩ standard 1% value).(4) Note: 4. In practice, the transformer is non-ideal, so RSET may need to be adjusted by up to 30% to obtain the desired Ifault trip threshold. VOS Trip Threshold Error Calculation The sense transformer typically has a toroidal core made of laminated steel rings or solid ferrite material. The secondary of the transformer is typically 800 to 1500 turns of #40 wire wound through the toroid. The primary is typically one to two turns 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 primaryto-secondary turns ratio, is the current that flows through the secondary wire of the transformer. Since the sense coil is DC connected to the feedback of the sense amplifier, the VOS offset introduces an Ifault threshold error. This error can be calculated as: %Error= 100 x (VOS x RSET) / (RIN + RLDC + RLAC) / VTH (3) where: VOS = +/-450μV (worse case); = +/-150μV (typical); A grounded neutral condition occurs when the neutralline is grounded at the neutral-load side. RSET = 511KΩ; RIN = 470Ω (typical value); Depending on the resistance of the grounded neutral connection, this condition causes the sense coil to detect a lower ground fault current. The detection of a ground-to-load-neutral fault relies on the principle of positive feedback. When this occurs, the sense and neutral coils are mutually coupled, which produces a positive feedback path around the sense amplifier. This positive feedback causes the sense amplifier to RLDC = 75Ω (sense coil secondary DC resistance); RLAC = VTH = 3.5V; © 2010 Fairchild Semiconductor Corporation FAN4147 • Rev. 1.0.1 FAN4147 — Ground Fault Interrupter Functional Description 1.5KΩ (AC(jωL) impedance of sense coil) (L= 4H, f= 60Hz); %Error = +/- 3.2% (worst case); +/-1.1% (typical). www.fairchildsemi.com 5 Unless otherwise specified, results are TA=25°C and according to Figure 2 with solenoid disconnected. Line (pin 3) is clamped to 12.7V during the positive VAC half cycle Ch1: Line (Pin 3) 10V/Div Ch2: AmpOut (Pin 6) 10V/Div Ch3: VREF (Pin 4) 10V/Div Ch4: VAC Input 200V/Div FAN4147 — Ground Fault Interrupter Typical Performance Characteristics Figure 4. Typical Waveforms with No Ground Fault Detection of IFault signal IFault = (VAmpout – VREF)•N/RSET Ch1: Line (Pin 3) 10V/Div Ch2: AmpOut (Pin 6) 5V/Div Ch3: SCR (Pin 1) 1V/Div Ch4: IFault 10mA/Div Figure 5. Typical Waveforms with 4mA Ground Fault © 2010 Fairchild Semiconductor Corporation FAN4147 • Rev. 1.0.1 www.fairchildsemi.com 6 Unless otherwise specified, results are TA=25°C and according to Figure 2 with solenoid disconnected. SCR Output Triggered Ch1: Line (Pin 3) 10V/Div Ch2: AmpOut (Pin 6) 5V/Div Ch3: SCR (Pin 1) 1V/Div Ch4: IFault 10mA/Div FAN4147 — Ground Fault Interrupter Typical Performance Characteristics Figure 6. Typical Waveforms with 5mA Ground Fault SCR Output Triggered Ch1: Line (Pin 3) 10V/Div Ch2: AmpOut (Pin 6) 5V/Div Ch3: SCR (Pin 1) 1V/Div Ch4: IFault 10mA/Div Figure 7. Typical Waveforms with 5mA Ground Fault (Line Polarity Reversal) © 2010 Fairchild Semiconductor Corporation FAN4147 • Rev. 1.0.1 www.fairchildsemi.com 7 Unless otherwise specified, results are TA=25°C and according to Figure 2 with solenoid disconnected. Sense amplifier oscillates with 2Ω grounded neutral fault Ch1: Line (Pin 3) 10V/Div Ch2: AmpOut (Pin 6) 5V/Div Ch3: SCR (Pin 1) 1V/Div FAN4147 — Ground Fault Interrupter Typical Performance Characteristics Figure 8. Typical Waveforms for Grounded Neutral Detection ~6.9KHz Sense Amplifier Oscillation Ch2: AmpOut (Pin 6) 2V/Div Figure 9. Typical Waveform for Grounded Neutral Detection © 2010 Fairchild Semiconductor Corporation FAN4147 • Rev. 1.0.1 www.fairchildsemi.com 8 FAN4147 — Ground Fault Interrupter Physical Dimensions Figure 10. 6-Lead SUPERSOT™ Package drawings are provided as a service to customers considering Fairchild components. Drawings may change in any manner without notice. Please note the revision and/or date on the drawing and contact a Fairchild Semiconductor representative to verify or obtain the most recent revision. Package specifications do not expand the terms of Fairchild’s worldwide terms and conditions, specifically the warranty therein, which covers Fairchild products. Always visit Fairchild Semiconductor’s online packaging area for the most recent package drawings: http://www.fairchildsemi.com/packaging/. © 2010 Fairchild Semiconductor Corporation FAN4147 • Rev. 1.0.1 www.fairchildsemi.com 9 FAN4147 — Ground Fault Interrupter © 2010 Fairchild Semiconductor Corporation FAN4147 • Rev. 1.0.1 www.fairchildsemi.com 10