MP174 700V Non-Isolated Off-Line Regulator, Up to 400mA Output Current The Future of Analog IC Technology DESCRIPTION FEATURES MP174 is a primary-side regulator that provides accurate constant voltage (CV) regulation without opto-coupler. It supports Buck, BuckBoost, Boost and Flyback topologies. It has an integrated 700V MOSFET to simplify the structure and reduce costs. These features make it an ideal regulator for off-line low power applications, such as home appliances and standby power. MP174 is a green-mode-operation regulator. Both the peak current and switching frequency decrease as the load decreases. This feature provides excellent efficiency at light load, and improves the overall average efficiency. MP174 features various protections, including thermal shutdown (OTP), VCC under-voltage lockout (UVLO), overload protection (OLP), short-circuit protection (SCP), and open loop protection. MP174 is available in small TSOT23-5 package and SOIC8 package. Primary-side CV control, supporting Buck, Buck-Boost, Boost and Flyback topologies Integrated 700V/13.5Ω MOSFET and current source <30mW no-load power consumption Up to 5W output power Maximum DCM output current less than 250mA Maximum CCM output current less than 400mA Low VCC Operating Current Frequency foldback Limited maximum frequency Peak-current compression Internally biased VCC OTP, UVLO, OLP, SCP, open loop protection APPLICATIONS Home appliances, white goods and consumer electronics Industrial controls Standby power All MPS parts are lead-free, halogen free, and adhere to the RoHS directive. For MPS green status, please visit MPS website under Quality Assurance. “MPS” and “The Future of Analog IC Technology” are Registered Trademarks of Monolithic Power Systems, Inc. TYPICAL APPLICATION MP174 Rev. 1.01 8/18/2016 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2016 MPS. All Rights Reserved. 1 MP174 – NON-ISOLATED OFF-LINE REGULATOR ORDERING INFORMATION Part Number* Package Top Marking MP174GJ MP174GS TSOT23-5 SOIC-8 See Below See Below * For Tape & Reel, add suffix –Z (e.g. MP174GJ–Z); * For Tape & Reel, add suffix –Z (e.g. MP174GS–Z); TOP MARKING AKC: product code of MP174GJ; Y: year code; TOP MARKING MP174: part number of MP174GS; LLLLLLLL: lot number; MPS: MPS prefix: Y: year code; WW: week code: PACKAGE REFERENCE TOP VIEW VCC 1 FB 2 SOURCE 3 5 4 TSOT23-5 MP174 Rev. 1.01 8/18/2016 TOP VIEW DRAIN SOURCE VCC 1 8 N/C FB 2 7 DRAIN SOURCE 3 6 N/C SOURCE 4 5 N/C SOIC-8 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2016 MPS. All Rights Reserved. 2 MP174 – NON-ISOLATED OFF-LINE REGULATOR ABSOLUTE MAXIMUM RATINGS (1) Thermal Resistance Drain to source .............................-0.3V to 700V All other pins ..................................-0.3V to 6.5V (2) Continuous Power Dissipation ....(TA = +25°C) TSOT23-5 ..................................................... 1W SOIC8 ........................................................... 1W Junction Temperature ...............................150°C Lead Temperature ....................................260°C Storage Temperature............... -60°C to +150°C ESD Capability Human Body Mode .......... 2.0kV ESD Charged Device Model TSOT23-5 ................................................. 1.5kV SOIC8 ....................................................... 2.0kV TSOT23-5.............................. 100 ..... 55... °C/W SOIC-8.................................... 96 ...... 45... °C/W Recommended Operating Conditions (3) (4) θJA θJC Notes: 1) Exceeding these ratings may damage the device. 2) The maximum allowable power dissipation is a function of the maximum junction temperature TJ(MAX), the junction-toambient thermal resistance θJA, and the ambient temperature TA. The maximum allowance continuous power dissipation at any ambient temperature is calculated by PD(MAX)=(TJ(MAX)-TA)/θJA. Exceeding the maximum allowance power dissipation will cause excessive die temperature, and the regulator will go into thermal shutdown. Internal thermal shutdown circuit protects the device from permanent damage. 3) The device is not guaranteed to function outside of its operating conditions. 4) Measured on JESD51-7, 4-layer PCB. Operating Junction Temp. (TJ). -40°C to +125°C Operating VCC range .....................5.3V to 5.6V MP174 Rev. 1.01 8/18/2016 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2016 MPS. All Rights Reserved. 3 MP174 – NON-ISOLATED OFF-LINE REGULATOR ELECTRICAL CHARACTERISTICS VCC = 5.5V, TJ=-40°C~125°C, Min & Max are guaranteed by characterization, typical is tested under 25°C, unless otherwise specified. Parameter Symbol Condition Start-up Current Source and Internal MOSFET (Drain Pin) Internal regulator supply current Iregulator VCC=4V;VDrain=100V Drain pin leakage current ILeak VCC=5.8V;VDrain=400V Breakdown Voltage ON resistance Supply Voltage Management (VCC Pin) VCC level (increasing) where the internal regulator stops VCC level (decreasing) where the internal regulator turns on VCC regulator on and off hysteresis VCC level (decreasing) where the IC stops VCC level (decreasing) where the protection phase ends V(BR)DSS TJ=25°C Ron TJ=25°C TJ=125°C Min Typ Max Units 2.2 4.1 10 6 17 mA μA 700 6 V VCCON 5.1 5.3 5.7 V 130 250 3 3.4 3.6 V 2.4 2.8 V fs=28kHz, D=67.8% 720 μA VCC=5.3V 16 200 24 uA μA 660 720 mA VCCstop VCCpro ICC ICCLATCH ILimit TJ=25°C 600 τLEB1 ISCP Leading-edge blanking for SCP Ω Ω 5.6 Internal IC consumption (No switching) Internal IC consumption, latch-off phase Internal Current Sense Peak current limit (1) 17 25 5.4 ICC SCP threshold 13.5 21 VCCOFF Internal IC consumption Leading-edge blanking V TJ=25°C 750 τLEB2 mV 350 ns 900 mA 180 ns Feedback Input (FB Pin) Minimum off time Maximum on time Primary MOSFET feedback turn-on threshold OLP feedback trigger threshold τminoff τmanon 9.5 12 15 μs 19 24 31 μs VFB 2.45 2.55 2.65 V VFB_OLP 1.6 1.7 1.8 V OLP delay time τOLP Open-loop detection Thermal Shutdown VOLD Thermal shutdown threshold (1) Thermal shutdown recovery hysteresis (1) fs=28kHz 220 0.4 0.5 ms 0.6 V 150 °C 30 °C Notes: 1) This parameter is guaranteed by design. MP174 Rev. 1.01 8/18/2016 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2016 MPS. All Rights Reserved. 4 MP174 – NON-ISOLATED OFF-LINE REGULATOR TYPICAL CHARACTERISTICS 5.73 2.56 5.72 2.55 5.71 2.54 5.70 2.53 710 -40 -25-10 5 20 35 50 65 80 95 110125 5.69 -40 -25-10 5 20 35 50 65 80 95 110125 2.52 -40 -25-10 5 20 35 50 65 80 95 110125 5.50 2.60 810 800 790 780 770 760 750 740 730 720 5.49 2.55 5.48 2.50 5.47 25 20 15 2.45 5.46 5.45 2.40 5.44 2.35 5.43 10 5 0 -40 -25-10 5 20 35 50 65 80 95 110125 5.42 -40 -25-10 5 20 35 50 65 80 95 110125 2.30 -40 -25-10 5 20 35 50 65 80 95 110 680 950 660 900 640 850 620 800 600 750 11.8 580 -40 -25-10 5 20 35 50 65 80 95 110125 700 -40 -25-10 5 20 35 50 65 80 95 110125 11.7 -40 -25-10 5 20 35 50 65 80 95 110125 12.3 12.2 12.1 12.0 MP174 Rev. 1.01 8/18/2016 11.9 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2016 MPS. All Rights Reserved. 5 MP174 – NON-ISOLATED OFF-LINE REGULATOR TYPICAL CHARACTERISTICS (continued) Maximum On Time vs. Temperature 24.6 24.4 24.2 24.0 23.8 23.6 23.4 23.2 -40-25-10 5 20 35 50 65 80 95110 125 MP174 Rev. 1.01 8/18/2016 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2016 MPS. All Rights Reserved. 6 MP174 – NON-ISOLATED OFF-LINE REGULATOR TYPICAL PERFORMANCE CHARACTERISTICS VIN = 265VAC, VOUT = 12V, IOUT = 300mA, L = 1.2mH, COUT = 100μF, TA = +25°C, unless otherwise noted. Zoom In Zoom In Zoom In VDS 100V/div. VDS 100V/div. VDS 100V/div. IL 200mA/div. IL 200mA/div. IL 500mA/div. Zoom In VDS 100V/div. IL 500mA/div. MP174 Rev. 1.01 8/18/2016 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2016 MPS. All Rights Reserved. 7 MP174 – NON-ISOLATED OFF-LINE REGULATOR TYPICAL PERFORMANCE CHARACTERISTICS (continued) VIN = 230VAC, VOUT = 12V, IOUT = 300mA, L = 1.2mH, COUT = 100μF, TA = +25°C, unless otherwise noted. VDS 100V/div. VDS 100V/div. IL 200mA/div. IL 200mA/div. VDS 100V/div. VDS 100V/div. IL 500mA/div. IL 500mA/div. VDS 100V/div. IL 500mA/div. VDS 100V/div. IL 500mA/div. VRIPPLE 200mV/div. VDS 100V/div. IL 500mA/div. MP174 Rev. 1.01 8/18/2016 VRIPPLE 50mV/div. IL 200mA/div. www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2016 MPS. All Rights Reserved. 8 MP174 – NON-ISOLATED OFF-LINE REGULATOR PIN FUNCTIONS Pin # Pin # Name TSOT23-5 SOIC8 1 1 VCC 2 2 FB 3,4 3,4 SOURCE 5 7 DRAIN 5,6,8 N/C MP174 Rev. 1.01 8/18/2016 Description Control circuit power supply. Regulator feedback. Internal power MOSFET source. Ground reference for VCC and FB pins. Internal power MOSFET drain. High-voltage current source input. Not connected. www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2016 MPS. All Rights Reserved. 9 MP174 – NON-ISOLATED OFF-LINE REGULATOR FUNCTIONAL BLOCK DIAGRAM Vcc Start up unit Power Management Drain Driving Signal Management Feedback control Peak current Limitation FB Protection Unit Source Figure 1: Functional Block Diagram MP174 Rev. 1.01 8/18/2016 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2016 MPS. All Rights Reserved. 10 MP174 – NON-ISOLATED OFF-LINE REGULATOR OPERATION MP174 is a green-mode-operation regulator: the peak current and the switching frequency both decrease with a decreasing load. As a result, it offers excellent light-load efficiency, and improves average efficiency. The typical application diagram shows the regulator operates with a minimum number of external components. It incorporates multiple features as described in the following sections. Start-Up and Under-Voltage Lockout The internal high-voltage regulator self-supplies the IC from the Drain pin. When VCC voltage reaches 5.6V, the IC starts switching and the internal high voltage regulator turns off. The internal high-voltage regulator turns on to charge the external VCC capacitor when the VCC voltage falls below 5.3V. A small capacitor (in the low μF range) can maintain the VCC voltage and thus lower the capacitor cost. The IC stops switching when the VCC voltage drops blow 3.4V. Under fault conditions—such as OLP, SCP, and OTP—the IC stops switching and an internal current source (~16μA) discharges the VCC capacitor. The internal high-voltage regulator will not charge the VCC capacitor until the VCC voltage drops below 2.4V. The restart time can be estimated using the following equation, restart C VCC VCC 2.4V 5.6V 2.4V C VCC 16A 4.1mA 24us 48us 12us Driver 128 Switching cycle 128 Switching cycle Figure 2: min off at Start-Up Constant Voltage Operation MP174 acts as a fully-integrated regulator when used in the Buck topology, as shown in the typical application on page1. It regulates the output voltage by monitoring the sampling capacitor. At the beginning of each cycle, the integrated MOSFET turns on while the feedback voltage drops below the 2.55V reference voltage, which indicates insufficient output voltage. The peak current limitation determines the ON period. After the ON period elapses, the integrated MOSFET turns off. Sampling capacitor (C3) voltage is charged to the output voltage, when the freewheeling diode (D1) turns on. In this way, the sampling capacitor (C3) samples and holds the output voltage for output regulation. The sampling capacitor (C3) voltage decreases when the L1 inductor current falls below the output current. When the feedback voltage falls below the 2.55V reference voltage, a new switching cycle begins. Figure 3 shows this operation under CCM in detail. MOSFET Soft-Start The IC stops operation when VCC voltage drops blow 3.4V and starts operation when VCC charges to 5.6V. Every time when the chip starts operation there is a Soft-Start period. The softstart prevents the inductor current from overshooting by limiting the minimum off time. MP174 adopts a 2 phase minimum off-time limit soft-start. Each Soft-Start phase retains 128 switching cycles. During soft-start, off time limit gradually shortens from 48μs to 24μs, and finally to the 12μs normal operation off-time limit (see Figure 2Error! Reference source not found.). MP174 Rev. 1.01 8/18/2016 Diode IL Ipeak Io Vo V FB 2.55V Figure 3: VFB vs. VO Use the following equation to determine the output voltage: www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2016 MPS. All Rights Reserved. 11 MP174 – NON-ISOLATED OFF-LINE REGULATOR Vo 2.55V R1 R2 R2 regulates the output based on the 2.55V reference voltage. Under light-load or no-load conditions, the output voltage drops very slowly, which increasing the MOSFET off time. Thus the frequency decreases as the load decreases. Ramp Compensation An internal ramp compensation circuit improves the load regulation. As shown in Figure 4, an exponential voltage signal added to pull down the reference voltage of the feedback comparator. The ramp compensation is a function of the load conditions: the compensation is about the 1mV/µs under full-load conditions compensation increases exponentially as the peak current decreases. Determine the switching frequency as: Over-Load Protection (OLP) Frequency Foldback and Peak Current Compression The MP174 remains highly efficient under lightload condition by reducing the switching frequency automatically. fs (Vin Vo ) Vo , for CCM 2L(Ipeak Io ) Vin fs 2(Vin VO ) Io Vo , for DCM LI2peak Vin Maximum output power of MP174 is limited by maximum switching frequency and peak current limit. If the load current is too large, output voltage drops, so that the FB voltage drops. At the same time, the peak current limit decreases from 660mA as the off-time increases. In standby mode, the frequency and the peak current are both minimized, allowing for a smaller dummy load. As a result, peak-current compression helps further reduce no-load consumption. Peak current limit can be estimated from the following equation (τoff is the power module’s off time): + Thermal Shutdown (OTP) FB Comparator EA + + M Vramp + Vramp + - V ref 2.55V 28kHz fs - EA Compensation - Delay 220ms Short-Circuit Protection (SCP) The MP174 monitors the peak current, and shuts down when the peak current rises above SCP threshold through short-circuit protection. The power supply resumes operation with the removal of the fault. IPeak 660mA (2.4mA / s) ( off 12s) VFB When the FB voltage drops below 1.7V it is considered as an error flag and timer starts. If the timer reaches 220ms (fS=28kHz), OLP occurs. This timer duration avoids triggering OLP when the power supply starts up or load transition. The power supply should start up in less than 220ms (fS=28kHz). The OLP delay time is calculated as per the following equation: Ipeak To prevent any thermal induced damage, the MP174 shuts down switching when the junction temperature exceeds 150°C. During the thermal shutdown (OTP), the VCC capacitor is discharged to 2.4V, and then the internal high voltage regulator re-charges. MP174 recovers when junction temperature drops below 120°C. Figure 4: EA and Ramp Compensation MP174 has internal error amplifier (EA) compensation loop. It samples the feedback voltage 6us after the MOSFET turns off, and MP174 Rev. 1.01 8/18/2016 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2016 MPS. All Rights Reserved. 12 MP174 – NON-ISOLATED OFF-LINE REGULATOR Open-Loop Detection If VFB is less than 0.5V, the IC will stop switching and a re-start cycle will begin. During Soft-Start, the open loop detection is blanked. Leading-Edge Blanking An internal leading-edge blanking (LEB) unit avoids premature switching pulse termination due to turn on spike. Turn on spike is caused by parasitic capacitance and reverse recovery of freewheeling diode. During the blanking time, the current comparator is disabled and can not turn off the external MOSFET. Figure 5shows the leading-edge blanking. IDS 350ns ILIMIT t Figure 5: Leading-Edge Blanking MP174 Rev. 1.01 8/18/2016 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2016 MPS. All Rights Reserved. 13 MP174 – NON-ISOLATED OFF-LINE REGULATOR APPLICATION INFORMATION Table 1: Common Topologies Using MP174 Topology Circuit Schematic DRAIN 1 5 Features VCC FB MP174 High-Side Buck SO URCE 2 3 4 SO URCE 1. 2. 3. 4. No-isolation, Positive output Low cost Direct feedback 1. 2. 3. 4. No-isolation, Negative output Low cost Direct feedback 1. 2. 3. 4. No-isolation, Positive output Low cost Direct feedback 1. 2. 3. 4. Isolation, Positive output Low cost Indirect feedback Vin Vo DRAIN 1 5 MP174 High-Side Buck-Boost SOURCE 2 3 4 VCC FB SOURCE Vin Vo DRAIN 1 5 Boost MP174 Vin 2 VCC FB Vo SOURCE SOURCE 3 4 T * + Vin Vo * Flyback DRAIN 1 5 MP174 SOURCE MP174 Rev. 1.01 8/18/2016 4 2 3 VCC FB SOURCE * www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2016 MPS. All Rights Reserved. 14 MP174 – NON-ISOLATED OFF-LINE REGULATOR Topology Options MP174 can be used in common topologies, such as Buck, Buck-Boost, Boost and Flyback. As illustrated in table 1. Po max Vo (Ipeak Po max Component Selection The input capacitor supplies the DC input voltage for the converter. Figure 6 shows the typical DC bus voltage waveform of half-wave rectifier and full-wave rectifier. Vin VDC(max) DC input voltage VDC(min) AC input voltage t Vin VDC(max) VDC( min) DC input voltage AC input voltage Figure 7 shows a example of a Pmin curve with a 12V output. Ipeak=0.6A and Tminoff=15μs is used as the worst case for PMIN calculation. 6 5.5 5 4.5 4 3.5 3 2.5 2 0.25 0.35 0.45 0.55 0.65 0.75 INDUCTANCE(mH) t Figure 6: Input Voltage Waveform Typically, the use of a half-wave rectifier requires an input capacitor rated at 3uF/W for the universal input condition. When using the fullwave rectifier, input capacitor is chosen as as 1.5~2uF/W for universal input condiont. Avoid a minimum DC voltage below 70V; a low DC input voltage can cause thermal issue. Half-wave rectifier is recommended for <2W output application and full-wave rectifier is recommended for >2W output application. Inductor The MP174 has a minimum off-time limit that determines the maximum power output. The maximum power increases as the inductor increases. Using a very small inductor may cause failure at full load, but a larger inductor means a higher OLP load. It is recommended to select an inductor with the minimum value that can supply the rated power. Estimate the maximum power with: MP174 Rev. 1.01 8/18/2016 1 2 1 , for DCM LIpeak min off 2 For mass production, tolerance on the parameters, such as peak current limitation, minimal off time, should be taken into consideration. PMIN(W) Input Capacitor Vo min off ) , for CCM 2L Figure 7: Pmin vs. L at 12V For a 3.6W output converter (12V, 0.3A), the minimum inductor value is about 0.36mH. But the switching frequency is too high using a 0.36mH inductor, which causes poor efficiency. Usually, it is recommended to use an inductor that make the switching frequency is higher than 20 kHz but not too high in large output current applications. To reduce costs, use a standard off-the-shelf inductor no less than the calculated value. Freewheeling Diode The diode should be selected based maximum input voltage and peak current. on The freewheeling diode’s reverse recovery can affect efficiency and circuit operation for CCM condiotn, so use an ultra fast diode such as the EGC10JH. www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2016 MPS. All Rights Reserved. 15 MP174 – NON-ISOLATED OFF-LINE REGULATOR Auxiliary VCC Supply Output Capacitor The output capacitor is required to maintain the DC output voltage. Estimate the output voltage ripple as: VCCM _ ripple VDCM _ ripple i i RESR , for CCM 8fsCo Io fsCo R3 D3 D2 VCC C3 FB MP174 R1 C4 R2 L1 SOURCE SOURCE VOUT 2 I I pk o Ipk RESR , for DCM I pk It is recommended to use ceramic, tantalum or low ESR electrolytic capacitors to reduce the output voltage ripple. Feedback Resistors The resistor divider determines the output voltage. Appropriate R1 and R2 values should be chosen to maintain VFB at 2.55V. R2 is typically 5kΩ to 10kΩ, avoid large R2 value. Figure 8: Auxiliary VCC Supply Circuit For VO above 7V applications, MP174 can achieve the 30mW no-load power requirement. In order to do this, chip requires an external VCC supply to reduce overall power consumption. This auxiliary VCC supply is derived from the resistor connected between C3 and C4. C4 should be set larger than recommendation above. D3 is used in case that VCC interfere with FB, R3 is determined per the formula below. Feedback Capacitor The feedback capacitor provides a sample and hold function. Small capacitors result in poor regulation at light loads, and large capacitors affect the circuit operation. Roughly estimate an optimal capacitor value using the following equation: C Vo C 1 Vo o CFB o 2 R1 R 2 Io R1 R 2 Io Dummy Load A dummy load is required to maintain the load regulation. This ensures sufficient inductor energy to charge the sample and hold capacitor to detect the output voltage. Normally a 3mA dummy load is needed and can be adjusted according to the regulated voltage. It is a compromise between small no load consumption and good no load regulation, especially for applications require 30mW no load consumption. Use a zener to reduce no-load consumption if noload regulation is not a concern. R Vo 5.8V IS Where IS is the VCC consumption under no load condition. R should be adjusted to meet the actual IS, because it varies in different application. In a particular configuration, IS is measured as about 250uA. Surge Performance Appropriate input capacitor value should be chosen to obtain a good surge performance. Figure 9 shows the half-wave rectifier. Table 2 shows the capacitance required under normal condition for different surge voltages. FR1 is 20Ω/2W fused resistor and L1 is 1mH for this recommendation. L FR1 L1 C1 C2 N Figure 9: Half-Wave Rectifier MP174 Rev. 1.01 8/18/2016 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2016 MPS. All Rights Reserved. 16 MP174 – NON-ISOLATED OFF-LINE REGULATOR Design Example Table 2: Recommended Capacitance Surge 500V 1000V 2000V voltage 1μF 2.2μF 3.3μF C1 1μF 2.2μF 3.3μF C2 Layout Guide PCB layout is very important for reliable operation, and good EMI and thermal performance. Please follow these guidelines to optimize performance. 1) Minimize the loop area formed by the input capacitor, IC, freewheeling diode, inductor and output capacitor. Below is a design example following the application guidelines for the specifications: Table 3: Design Example 85VAC to 265VAC VIN 12V VOUT 300mA IOUT The detailed application schematic is shown in Figure.10. The typical performance and circuit waveforms have been shown in the Typical Performance Characteristics section. For more device application, please refer to the related Evaluation Board Datasheets. 2) Place the power inductor far away from the input filter while keeping the loop area to the inductor to a minimum, see example below. 3) Place a capacitor valued at several hundred pF between the FB pin and source as close the IC as possible. 4) Connect the exposed pads or large copper area with the DRAIN pin to improve thermal performance. Top Bottom Layer MP174 Rev. 1.01 8/18/2016 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2016 MPS. All Rights Reserved. 17 MP174 – NON-ISOLATED OFF-LINE REGULATOR TYPICAL APPLICATION CIRCUITS Figure 10 shows a typical application example of a 12V, 300mA non-isolated power supply using MP174. D1 D2 1N4007 1N4148WS F1 L1 10/1W 1mH 8 R5 L D3 D4 1N4007 1N4007 RV1 7 NC CX1 C4 10uF/400V NC NC C5 10uF/400V 5 Drain NC NC MP174 D6 D7 1N4007 1N4007 Vcc FB Source Source R1 24K 19.1K 1 2 C3 3 C1 220nF NC 6 85~265VAC U1 R2 C2 R3 R4 2.2uF NC 4.99K 470pF L2 1.2mH 12V/300mA VOUT 4 D5 STTH1R06 C6 C7 R6 100uF/35V 1uF 3K GND N GND Figure 10: Typical Application at 12V, 300mA MP174 Rev. 1.01 8/18/2016 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2016 MPS. All Rights Reserved. 18 MP174 – NON-ISOLATED OFF-LINE REGULATOR FLOW CHART Power On Vcc Decrease to 2.4V Internal High Voltage Regulator ON Shut Down Internal High Voltage Regulator Y Y N Vcc>5.6V N Soft Start Stop operation Y Vcc<3.4V Y Protection Logic High ? Monitor Vcc Shut Down Internal High Voltage Regulator Y N Vcc > 5.6V Vcc < 5.3V N OTP, SCP and open loop Monitor Y Internal High Voltage Regulator ON Monitor VFB Y N VFB<2.55V VFB <1.7V N VFB < 0.5V 6144 switching Y counter finished? N N Y Turn ON the MOSFET N Y Y Open loop Logic High Continuous Fault Monitor OLP= Logic High UVLO, SCP, OLP, OTP and Open loop protections are auto restart Figure 11: Control Flow Chart MP174 Rev. 1.01 8/18/2016 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2016 MPS. All Rights Reserved. 19 MP174 – NON-ISOLATED OFF-LINE REGULATOR Figure 12: Signal Evolution in the Presence of a Fault MP174 Rev. 1.01 8/18/2016 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2016 MPS. All Rights Reserved. 20 MP174 – NON-ISOLATED OFF-LINE REGULATOR PACKAGE INFORMATION TSOT23-5 0.95 BSC 0.60 TYP 2.80 3.00 5 4 1.20 TYP 1.50 1.70 1 2.60 TYP 2.60 3.00 3 TOP VIEW RECOMMENDED LAND PATTERN 0.70 0.90 1.00 MAX 0.09 0.20 SEATING PLANE 0.30 0.50 0.95 BSC 0.00 0.10 SEE DETAIL "A" FRONT VIEW SIDE VIEW NOTE: GAUGE PLANE 0.25 BSC 0.30 0.50 0o-8o DETAIL MP174 Rev. 1.01 8/18/2016 A 1) ALL DIMENSIONS ARE IN MILLIMETERS. 2) PACKAGE LENGTH DOES NOT INCLUDE MOLD FLASH, PROTRUSION OR GATE BURR. 3) PACKAGE WIDTH DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSION. 4) LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.10 MILLIMETERS MAX. 5) DRAWING CONFORMS TO JEDEC MO-193, VARIATION AA. 6) DRAWING IS NOT TO SCALE. www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2016 MPS. All Rights Reserved. 21 MP174 –NON-ISOLATED OFF-LINE REGULATOR PACKAGE INFORMATION SOIC8 0.189(4.80) 0.197(5.00) 8 0.050(1.27) 0.024(0.61) 5 0.063(1.60) 0.150(3.80) 0.157(4.00) PIN 1 ID 1 0.228(5.80) 0.244(6.20) 0.213(5.40) 4 TOP VIEW RECOMMENDED LAND PATTERN 0.053(1.35) 0.069(1.75) SEATING PLANE 0.004(0.10) 0.010(0.25) 0.013(0.33) 0.020(0.51) 0.0075(0.19) 0.0098(0.25) SEE DETAIL "A" 0.050(1.27) BSC SIDE VIEW FRONT VIEW 0.010(0.25) x 45o 0.020(0.50) GAUGE PLANE 0.010(0.25) BSC 0o-8o 0.016(0.41) 0.050(1.27) DETAIL "A" NOTE: 1) CONTROL DIMENSION IS IN INCHES. DIMENSION IN BRACKET IS IN MILLIMETERS. 2) PACKAGE LENGTH DOES NOT INCLUDE MOLD FLASH , PROTRUSIONS OR GATE BURRS. 3) PACKAGE WIDTH DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS. 4) LEAD COPLANARITY(BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.004" INCHES MAX. 5) DRAWING CONFORMS TO JEDEC MS-012, VARIATION AA. 6) DRAWING IS NOT TO SCALE. NOTICE: The information in this document is subject to change without notice. Please contact MPS for current specifications. Users should warrant and guarantee that third party Intellectual Property rights are not infringed upon when integrating MPS products into any application. MPS will not assume any legal responsibility for any said applications. MP174 Rev. 1.01 8/18/2016 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2016 MPS. All Rights Reserved. 22