MP155 Energy Efficient Off-line Regulator The Future of Analog IC Technology DESCRIPTION FEATURES • The MP155 is a primary-side regulator that provides accurate constant voltage regulation without the opto-coupler, and supports Buck, Buck-boost, Boost and Flyback topologies. An integrated 500V MOSFET simplifies the structure and reduces costs. These features make it a competitive candidate for off-line lowpower applications, such as home appliances and standby power. • • • • • • • • • • • • • The MP155 is a green-mode-operation regulator. Both the peak current and the switching frequency decrease as the load decreases. As a result, it offers excellent efficiency performance at light load, thus improving the overall average efficiency. The MP155 features various protections such as thermal shutdown (TSD), VCC under-voltage lockout (UVLO), overload protection (OLP), short-circuit protection (SCP), and open loop protection. • • • Primary-side constant voltage (CV) control, supporting Buck, Buck-boost, Boost and Flyback topologies Integrated 500V/20Ω MOSFET < 100mW No-load power consumption Up to 3W output power Maximum DCM output current of 130mA Maximum CCM output current of 220mA Low VCC operating current Frequency foldback Maximum frequency limit Peak current compression Internal high-voltage current source Internal 350ns leading-edge blanking Thermal shutdown (auto restart) VCC under-voltage lockout with hysteresis (UVLO) Timer-based overload protection. Short circuit protection Open loop protection APPLICATIONS The MP155 is available in the TSOT23-5 and SOIC8 packages. • • • Home Appliances, white goods and consumer electronics Industrial Controls Standby Power All MPS parts are lead-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 D2 DRAIN D3 VCC C3 L1 R1 C4 FB R2 SOURCE C1 C2 Output MP155 D1 MP155 Rev. 1.12 10/28/2013 L2 SOURCE C5 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. 1 MP155 – ENERGY EFFICIENT OFF-LINE REGULATOR ORDERING INFORMATION Part Number* Package Top Marking MP155GJ MP155GS TSOT23-5 SOIC8 AEN MP155 * For Tape & Reel, add suffix –Z (e.g. MP155GJ–Z); * For Tape & Reel, add suffix –Z (e.g. MP155GS–Z); PACKAGE REFERENCE TOP VIEW VCC 1 FB 2 SOURCE 3 TOP VIEW 5 4 DRAIN SOURCE TSOT23-5 VCC 1 8 N/C FB 2 7 DRAIN SOURCE 3 6 N/C SOURCE 4 5 N/C SOIC8 ABSOLUTE MAXIMUM RATINGS (1) Thermal Resistance Drain to SOURCE .........................-0.7V to 500V All the other Pin .............................-0.7V 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 .......... 4.0kV ESD Capability Machine Mode .................. 200V TSOT23-5.............................. 100 ..... 55... °C/W SOIC8..................................... 96 ...... 45... °C/W Recommended Operating Conditions (3) Operating Junction Temp. (TJ). -40°C to +125°C Operating VCC range .....................5.3V to 5.6V MP155 Rev. 1.12 10/28/2013 (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. www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. 2 MP155 – ENERGY EFFICIENT OFF-LINE REGULATOR ELECTRICAL CHARACTERISTICS VCC = 5.8V, TA = 25°C, unless otherwise noted. Parameter Symbol Start-up Current Source (Drain Pin) Internal regulator supply current Iregulator Drain pin leakage current ILeak Breakdown Voltage V(BR)DSS Supply Voltage Management (VCC Pin) VCC regulator turn-off level (rising) VCCOFF VCC regulator turn-on level (falling) VCCON On and off VCC regulator hysteresis VCC turn-off level (falling) VCCstop VCC phase completion level (falling) VCCpro Internal IC consumption Internal IC consumption (no switching) Internal IC Consumption, latch-off phase Internal MOSFET (Drain Pin) Breakdown voltage ON-State resistance ICC Condition Min Typ Max Units VCC=4V;VDrain=100V VCC=5.8V;VDrain=400V 2.5 3.5 10 4.5 12 mA μA V 5.6 5.3 250 3.4 2.4 5.8 5.6 V V mV V V 430 μA 250 μA 500 5.4 5.1 VCC=5.8V, fs=37kHz, D=40% ICC ICCLATCH VCC=5.3V VBRDSS 16 μA 500 Ron V 20 Ω Internal Current Sense Peak current limit ILimit 260 290 345 mA Leading-edge blanking τLEB1 350 ns SCP point ISCP 450 mA Leading-edge blanking for SCP τLEB2 180 ns Feedback input (FB Pin) Minimum OFF time Primary MOSFET feedback turn-on threshold OLP feedback trigger threshold τminoff 15 18 21 μs VFB 2.4 2.5 2.6 V VFB_OLP 1.6 1.7 1.8 V Over-load protection delay τOLP Open loop detection Thermal Shutdown VOLD Thermal shutdown threshold MP155 Rev. 1.12 10/28/2013 fs=37kHz 170 ms 60 mV 150 °C www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. 3 MP155 – ENERGY EFFICIENT OFF-LINE REGULATOR TYPICAL CHARACTERISTICS Breakdown Voltage vs. Junction Temperature 640 620 2 On-State Resistance vs. Junction Temperature Feedback Voltage vs. Junction Temperature 2.8 2.7 1.6 2.6 1.2 580 560 VFB(V) VBRDSS(V) 600 0.8 540 2.4 2.3 2.2 0.4 520 2.5 2.1 500 -40 -20 0 25 85 105 125 0 -40 -20 0 25 85 105 125 2 -40 -20 0 25 85 105 125 Minimum Off Time vs. Junction Temperature 20 19 18 17 16 15 14 13 12 11 10 -40 -20 MP155 Rev. 1.12 10/28/2013 0 25 85 105 125 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. 4 MP155 – ENERGY EFFICIENT OFF-LINE REGULATOR TYPICAL PERFORMANCE CHARACTERISTICS VIN = 265VAC, VOUT = 12V, IOUT = 200mA, L = 2.2mH, COUT = 100μF, TA = +25°C, unless otherwise noted. Start up Normal operation SCP Zoom In Zoom In Zoom In VDS 100V/div. VDS 100V/div. VDS 100V/div. IL 100mA/div. IL 100mA/div. IL 100mA/div. Open Loop Protection Zoom In VDS 100V/div. IL 250mA/div. MP155 Rev. 1.12 10/28/2013 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. 5 MP155 – ENERGY EFFICIENT OFF-LINE REGULATOR TYPICAL PERFORMANCE CHARACTERISTICS (continued) VIN = 230VAC, VOUT = 12V, IOUT = 200mA, L = 2.2mH, COUT = 100μF, TA = +25°C, unless otherwise noted. Input Power Start Up Input Power Shut Down VDS 100V/div. VDS 100V/div. IL 200mA/div. IL 200mA/div. SCP recovery SCP Entry VDS 100V/div. IL 200mA/div. Open Loop Entry Open Loop Recovery VDS 100V/div. VDS 100V/div. VDS 100V/div. IL 200mA/div. IL 200mA/div. IL 200mA/div. Output Voltage Ripple VRIPPLE 50mV/div. Load Transient VRIPPLE 50mV/div. IOUT 200mA/div. MP155 Rev. 1.12 10/28/2013 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. 6 MP155 – ENERGY EFFICIENT 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 MP155 Rev. 1.12 10/28/2013 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. © 2013 MPS. All Rights Reserved. 7 MP155 – ENERGY EFFICIENT OFF-LINE REGULATOR FUNCTIONAL BLOCK DIAGRAM Figure 1: Functional Block Diagram MP155 Rev. 1.12 10/28/2013 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. 8 MP155 – ENERGY EFFICIENT OFF-LINE REGULATOR OPERATION The MP155 is a green-mode-operation regulator. The peak current and the switching frequency both decrease as the load decreases to provide excellent efficiency at light load, and thus improve the overall average efficiency. The typical application diagram shows that the regulator operates using a minimal number of external components. It incorporates the following features: Start-up and Under Voltage Lock-out The internal high-voltage regulator supplies IC from the Drain pin. The IC starts switching and the internal high voltage regulator turns off when the voltage on VCC reaches 5.6V. When the VCC voltage drops below 5.3V, the internal high voltage regulator turns on again to charge the external VCC capacitor. Use a capacitor in the several µF range stabilize the VCC voltage and this can lower the cost by decreasing the value of the capacitor. When the voltage on VCC drops blow 3.4V, the IC stops, then the internal high-voltage regulator charges the VCC capacitor. When faults occur, such as overload, short circuit, and over-heating, the IC stops working and an internal current source (16µA) discharges the VCC capacitor. Before the VCC voltage drops below 2.4V, the internal high-voltage regulator remains off and the VCC capacitor remains discharged. Estimate the restart time after a fault as: τrestart = CVCC × VCC − 2.4V 5.6V − 2.4V + C VCC × 16uA 3.5mA Figure 2 shows the typical waveform with VCC under voltage lock out. MP155 Rev. 1.12 10/28/2013 Figure 2: VCC Under-Voltage Lockout Constant Voltage Operation The MP155 is a fully-integrated regulator when used in a Buck solution as shown in the typical application on page 1. The integrated MOSFET turns ON at the beginning of each cycle when the feedback voltage is below the reference voltage (2.5V), which indicates insufficient output voltage. The peak current limit determines the ON period. After the ON period elapses, the integrated MOSFET turns OFF. The freewheeling diode (D1) remains OFF until the inductor current charges the sampling capacitor (C4) voltage to the output voltage level. Then the sampling capacitor voltage changes with the output voltage. The sampling capacitor can sample and hold the output voltage to regulate the output voltage. The sampling capacitor voltage decreases after the inductor current drops below the output current. When the feedback voltage falls below the reference voltage (2.5V), a new switching cycle begins. Figure 3 shows the detailed operation timing diagram under CCM. www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. 9 MP155 – ENERGY EFFICIENT OFF-LINE REGULATOR Minimum off time limitation The MP155 implements a minimum OFF time limit. During the normal operation, the minimum OFF time limit is 18µs; during start up, the minimum OFF time limit gradually drops from 72µs, to 36µs, then to 18 µs (see Figure 4). Each minimum OFF time has 128 switching cycles. This soft-start function allows for safe start-up. MOS Diode IL Ipeak Io Vo VFB 2.5V Driver ≥ 18us ≥ 36us ≥ 72us Figure 3: VFB vs. Vout Monitoring the sampling capacitor regulates the output voltage can be regulated, as per the following equation: Vo = 2.5V × R1 + R2 R2 Frequency Foldback Under light load or no load conditions, the output drops very slowly, which increases the time for the MOSFET to turn ON again; i.e., frequency decreases as the load decreases. So the MP155 can maintain a high efficiency under light load condition by reducing the switching frequency automatically. The switching frequency can be obtained as: fs = (Vin − Vo ) Vo ⋅ , for CCM 2L(Ipeak − Io ) Vin fs = 2(Vin − VO ) Io Vo ⋅ , for DCM LI2peak Vin At the same time, the peak current limit decreases from 290mA as the OFF time increases. In standby mode, the frequency and the peak current are both minimized, allowing for a small dummy load. As a result, the peakcurrent-compression function helps to reduce noload consumption. Determine the peak current limitation from the following equation where τoff is the power module OFF time: IPeak = 290mA − (1mA / μS) × ( τoff − 18μS) MP155 Rev. 1.12 10/28/2013 128 Switching cycle 128 Switching cycle Figure 4: τminoff at Start-Up EA Compensation FB Comparator + EA VFB + + Vramp + + - Vramp Vref 2.5V Ipeak Figure 5: EA and Ramp Compensation To improve load regulation, the MP150 implements an error amplifier (EA) compensation function ( Figure 5 ). The MP155 samples the feedback voltage 6µs after the MOSFET turns off. EA compensation regulates the 2.5V reference voltage with the load, thus improving the power module regulation. RAMP Compensation An internal ramp compensation circuit precisely maintains the output voltage. An additional exponential voltage sinking source pulls down the feedback comparator’s reference voltage as shown in Figure 5. The ramp compensation is relative to the load conditions: Under full-load conditions, the compensation is ~1mV/µs; with a decreasing load, the compensation increases exponentially. www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. 10 MP155 – ENERGY EFFICIENT OFF-LINE REGULATOR Over Load Protection (OLP) As the load increases, the peak current and the switching frequency increase with the load. When the switching frequency and peak current reaches their maximums, the output voltage will decrease if the load continues to increase. Then the FB voltage will drop below OLP threshold. By continuously monitoring the FB voltage, the timer starts when the FB voltage drops below the 1.7V error flag threshold. Removing the error flag resets the timer. If the timer continues to completion at 170ms (fs =37kHz), OLP occurs. This timer duration avoids triggering OLP when the power supply starts up or enters a load transition phase, and therefore requires that the power supply start up in less than 170ms. A different switching frequency (fs) changes the over-load protection delay time, as shown below: τDealy ≈ 170ms × Open Loop Detection If the VFB drops below 60mV, the IC will stop working and begins a re-start cycle. The openloop detection is blanked for 128 switching cycles during start-up. Leading-Edge Blanking An internal leading-edge blanking (LEB) unit between the current sense resistor inside the IC and the current comparator input avoids prematurely switching pulse termination due to the parasitic capacitance. During the blanking period, the current comparator is disabled and cannot turn off the external MOSFET. Figure 6 shows leading-edge blanking. 37kHz fs Short Circuit Protection (SCP) The MP155 shuts down when the peak current rises above 450mA as its short-circuit protection threshold. The power supply resumes operation after removing the fault. Figure 6: Leading-Edge Blanking Thermal shutdown (TSD) To prevent from any lethal thermal damage, the MP150 shuts down switching when the inner temperature exceeds 150°C. During thermal shutdown (TSD), the VCC drops to 2.4V, and then the internal high voltage regulator recharges VCC. MP155 Rev. 1.12 10/28/2013 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. 11 MP155 – ENERGY EFFICIENT OFF-LINE REGULATOR APPLICATION INFORMATION Table 1. Common Topologies Using MP155 Topology High-Side Buck Circuit Schematic Features 1. 2. 3. 4. No-isolation, Positive output Low cost Direct feedback 1. No-isolation, 2. Negative output 3. Low cost High-Side Buck-Boost Boost 4. 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 Flyback MP155 Rev. 1.12 10/28/2013 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. 12 MP155 – ENERGY EFFICIENT OFF-LINE REGULATOR MP155 can be used in common topologies, such as Buck, Buck-Boost, Boost and Flyback. Please find the Table.1 for more information. Component Selection Input Capacitor The input capacitor supplies the converter’s DC input voltage. Figure 7 shows the typical halfwave rectifier’s DC bus voltage waveform. MAXIMUM OUTPUT POWER(W) 1.2 Topology Options 1.1 1 0.9 PMIN 0.8 0.7 0.6 0.6 1.1 1.6 2.1 2.6 INDUCTOR(mH) Figure 7: Input Voltage Waveform When using the half-wave rectifier, set the input capacitor 3µF/W for the universal input condition. When using the full-wave rectifier, choose a smaller capacitor, but avoid a minimum DC voltage below 70V to avoid thermal shutdown. MAXIMUM OUTPUT POWER(W) Figure 8: Pmin vs. L for 5V 3 2.5 2 1.5 1 PMIN 0.5 0 0.6 1.1 Inductor MP155 has a minimum off time limit that determines the maximum power output. The maximum power increases with the inductor value. Using a smaller inductor may cause the output to fail at full load, but a larger inductor results in a higher OLP load. The optimal inductor value is the smallest that can supply the rated power. The maximum power is: Po max = Vo (Ipeak − Po max = Vo τmin off ) , for CCM 2L 1 2 1 , for DCM LIpeak ⋅ 2 τmin off To account for converter parameters—such as peak current limit and minimum OFF time— estimate the minimum inductor power (Pmin) for the maximum power, and selecting an inductor with a Pmin value that exceeds the rated power. 1.6 2.1 2.6 INDUCTOR(mH) Figure 9: Pmin vs. L for 12V When designing a 0.5W converter (5V, 0.1A), estimate the minimum inductor value at 0.6mH based on Figure 8. Similarly, for a 1.2W converter (12V, 0.1A), estimate the minimum inductor at 0.9mH based on Figure 9 . Use a standard off-the-shelf inductor to reduce costs. Use a standard inductance that exceeds calculated inductance. Freewheeling Diode Choose a diode with a maximum reverse voltage rating that exceeds the maximum input voltage, and a current rating that exceeds the output current. The reverse recovery of the freewheeling diode can affect the efficiency and circuit operation. Select an ultra-fast diode, such as the EGC10JH. Using output voltages 5V and 12V as examples, Figure 8 shows the curve for Pmin at 5V, and Figure 9 shows the curve for Pmin at 12V. (Ipeak=0.29A, τminoff=18µs) MP155 Rev. 1.12 10/28/2013 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. 13 MP155 – ENERGY EFFICIENT OFF-LINE REGULATOR Output Capacitor The output capacitor maintains the DC output voltage. Estimate the output voltage ripple as: VCCM _ ripple = VDCM _ ripple I = o fsCo Δi + Δi ⋅ RESR , for CCM 8fsCo 2 ⎛I −I ⎞ ⋅ ⎜ pk o ⎟ + Ipk ⋅ RESR , for DCM ⎜ I ⎟ ⎝ pk ⎠ Use ceramic, tantalum, or low-ESR electrolytic capacitors to lower the output voltage ripple. Feedback Resistors The resistor divider determines the output voltage. Choose appropriate R1 and R2 values to maintain the FB voltage at 2.5V. Avoid very large values for R2 (typical values between 5kΩ to10kΩ. Table 2: Recommended VCC Supply Resistor Values Vout Resistor value 3.3V NC（5） 5V NC 12V 24.8k 16V 40.8k 24V 72.8k Note: 5) NC= no connection Surge Performance To obtain a good surge performance, select an appropriate input capacitor that meets different surge tests. Figure 10 shows the half-wave rectifier. Table 3 shows the required capacitance under normal conditions for different surge voltages. Feedback Capacitor The feedback capacitor provides a sample-andhold function. Small capacitors result in poor regulation at light load condition, and large capacitors can impact circuit operation. Estimate the capacitor range as per the following equation: C Vo C 1 Vo ⋅ o ≤ CFB ≤ ⋅ o 2 R1 + R 2 Io R1 + R 2 Io Choose an appropriate value given practical considerations. Dummy Load A dummy load maintains the load regulation. This ensures sufficient inductor energy to charge the sample-and-hold capacitor to detect the output voltage. Start with a 3mA dummy load and adjust as necessary. Figure 10: Half-Wave Rectifier Table 3: Recommended Capacitor Values Surge voltage C1 C2 500V 1000V 2000V 1μF 1μF 10μF 4.7μF 22μF 10μF VCC Supply The MP155 obtains a low no-load power consumption by external VCC supply. This supply is dependent on the value of Vout. Connect a diode and resistor between C3 and C4 as per the values listed in Table 2. MP155 Rev. 1.12 10/28/2013 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. 14 MP155 – ENERGY EFFICIENT OFF-LINE REGULATOR Layout Guide PCB layout is very important to achieve reliable operation, and good EMI and thermal performance. Follow these guidelines to optimize performance. 1) Minimize the loop area formed by the input capacitor, IC part, freewheeling diode, inductor and output capacitor. 2) Place the power inductor far away from the input filter. 3) Add a capacitor in the several-hundred pF range between pin FB and source as close to the IC as possible. 4) Connect the exposed pad with the Drain pin to a large copper area to improve thermal performance. Bottom Layer Design Example Below is a design example following the application guidelines given the following specifications: Table 4: Design Example 85 to 265Vac VIN 12V VOUT 200mA IOUT Figure 11 shows the detailed application schematic. The Typical Performance Characteristics section lists typical performance and circuit waveforms. For more device application, please refer to the related Evaluation Board Datasheets. Top MP155 Rev. 1.12 10/28/2013 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. 15 MP155 – ENERGY EFFICIENT OFF-LINE REGULATOR TYPICAL APPLICATION CIRCUITS Figure 11 shows a typical application example of a 12V, 200mA non-isolated power supply using the MP155. D5 D1 1N4007 1N4148 R1 19.1 k R5 24.9 k C1 U1 5 Drain Vcc FB L1 RF1 L 10 D2 4 Source Source 1 2 220nF C2 C7 470pF R2 4 .99k 12V/200mA L2 Vout 3 1 mH 2.2 mH 1N4007 MP155 C3 D3 C4 /400 V 10 /400V WUGC10JH C5 /16V C6 R3 1 3 .9 k D4 N GND 1N 4007 GND Figure 11: Typical Application, 12V/200mA MP155 Rev. 1.12 10/28/2013 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. 16 MP155 – ENERGY EFFICIENT OFF-LINE REGULATOR FLOW CHART Start Vcc Decrease to 2.4 Internal High Voltage Regulator ON Shut Down Internal High Voltage Regulator Y Vcc>5.6V N Shut off the Switching Pulse Y Vcc<5.3V Y Y N N Vcc<3.4V OTP, SCP or open loop Logic High? Y N Y Soft Start OTP, SCP and open loop Monitor Monitor Vcc Monitor VFB N VFB<2.5V Y Turn ON the MOSFET VFB<1.7V N Y 6144 switching counter finished? Y Y N Continuous Fault Monitor OLP=Logic High UVLO, OTP, SCP, OLP and Open Loop Protection are auto restar Figure 12: Control Flow Chart MP155 Rev. 1.12 10/28/2013 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. 17 MP155 – ENERGY EFFICIENT OFF-LINE REGULATOR Figure 13: Signal Evolution in the Presence of a Fault MP155 Rev. 1.12 10/28/2013 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. 18 MP155 – ENERGY EFFICIENT OFF-LINE REGULATOR PACKAGE INFORMATION TSOT23-5 MP155 Rev. 1.12 10/28/2013 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. 19 MP155 – ENERGY EFFICIENT 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. MP155 Rev. 1.12 10/28/2013 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. 20