MP4068GS

MP4068 Non-Isolated,TRIAC Dimmable PFC LED Driver for 120VAC, Up to 10W LEDs The Future of Analog IC Technology DESCRIPTION FEATURES The MP4068 is a highly integrated TRIAC dimmable LED driver with a high power factor (PF). It regulates precisely LED current in nonisolated lighting applications. Only a single winding inductor is required to realize the solution. For low-line (120VAC) applications, the integrated 500V MOSFET ensures that the system can withstand a 500V surge test without MOV or TVS. It features MPS’ proprietary hybrid operation mode, which is designed to achieve good dimming performance. The MP4068 is designed specifically for low-line input (120VAC) and TRIAC dimmable LED lighting applications, especially for low cost and small form factor applications. • • • • • • • • • • • The accurate output LED current is achieved by an internal averaging current feedback loop. An internal high-voltage regulator makes the MP4068 start-up quickly without a perceptible delay. The power de-rating at high temperature makes the system flicker-free when the ambient temperature is high. The MP4068 has protection features such as VCC under-voltage lockout (UVLO), overvoltage protection (OVP), and short-circuit protection (SCP). All of these features make MP4068 an ideal solution for simple, off-line, and non-isolated TRIAC dimmable LED lighting applications. • • • • Excellent TRIAC Dimming Performance Lowest Cost BOM Constant Current LED Driver Integrated 500V MOSFET Internal HV Fast Start-Up Single Winding Inductor High Power Factor(>0.7) Good LED Current Accuracy Supports Buck/Buck-Boost Topology LED Current Foldback at High Temperature Thermal Shutdown (Auto Re-Start with Hysteresis) VCC Under-Voltage Lockout with Hysteresis (UVLO) Programmable Over-Voltage Protection Output Short-Circuit Protection Available in SOIC8-7A/SOIC-8 EP Packages APPLICATIONS • • • 120VAC, Up to 10W LED Lighting Residential and Commercial Lighting TRIAC Dimmible LED Lighting, A19, GU10, PAR Lamps 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. The MP4068 is available in SOIC8-7A and SOIC-8 EP packages. MP4068 Rev. 1.01 7/30/2015 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2015 MPS. All Rights Reserved. 1 MP4068 – HIGH PF, NON-ISOLATED, TRIAC DIMMABLE LED DRIVER TYPICAL APPLICATION (BUCK) HV L2 VCC R4 C2 TRIAC Dimmer R5 C3 RF1 C1 D1 OVF C4 MP4068 C5 CS GND 108-132Vac D2 R2 R3 VOUT L1 R1 C6 TYPICAL APPLICATION (BUCK-BOOST) MP4068 Rev. 1.01 7/30/2015 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2015 MPS. All Rights Reserved. 2 MP4068 – HIGH PF, NON-ISOLATED, TRIAC DIMMABLE LED DRIVER ORDERING INFORMATION Part Number Top Marking MP4068GN* Package SOIC-8 EP MP4068GS** SOIC8-7A See Below See Below * For Tape & Reel, add suffix –Z (e.g. MP4068GN–Z) ** For Tape & Reel, add suffix –Z (e.g. MP4068GS–Z) TOP MARKING (MP4068GN) MP4068: product code of MP4068GN; LLLLLLLL: lot number; MPS: MPS prefix; Y: year code; WW: week code; TOP MARKING (MP4068GS) MP4068: product code of MP4068GS; LLLLLLLL: lot number; MPS: MPS prefix; Y: year code; WW: week code; MP4068 Rev. 1.01 7/30/2015 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2015 MPS. All Rights Reserved. 3 MP4068 – HIGH PF, NON-ISOLATED, TRIAC DIMMABLE LED DRIVER PACKAGE REFERENCE TOP VIEW VCC 1 TOP VIEW 8 HV GND 2 VCC 1 8 NC OVF 2 7 HV OVF 3 6 GND GND 3 6 NC CS 4 5 GND CS 4 5 NC SOIC8-7A SOIC-8 EP ABSOLUTE MAXIMUM RATINGS (1) Thermal Resistance HV to CS .......................................-0.3V to 500V VCC, CS to GND ............................-0.3V to6.5V OVF to GND ..................................-0.7V to 6.5V Source Current on OVF ............................. 4mA (2) Continuous Power Dissipation (TA = +25°C) SOIC8-7A .................................................. 1.6W SOIC-8 EP ................................................. 2.6W Lead Temperature ....................................260°C Storage Temperature............... -60°C to +150°C ESD Capability Human Body Mode .......... 2.0kV CDM ESD Capability................................. 2.0kV SOIC8-7A ............................... 76 ...... 35... °C/W SOIC-8 EP.............................. 48 ...... 10... °C/W Recommended Operating Conditions (3) Operating VCC Range .......................4.1V to 5V MP4068 Rev. 1.01 7/30/2015 (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 allowable continuous power dissipation at any ambient temperature is calculated by PD (MAX) = (TJ (MAX)-TA)/θJA. Exceeding the maximum allowable power dissipation produces an excessive die temperature, causing the regulator to go into thermal shutdown. Internal thermal shutdown circuitry 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. © 2015 MPS. All Rights Reserved. 4 MP4068 – HIGH PF, NON-ISOLATED, TRIAC DIMMABLE LED DRIVER ELECTRICAL CHARACTERISTICS Typical values are VCC =5V, TJ = 25°C, unless otherwise noted. Minimum and maximum values are at VCC =5V, TJ = -40°C to +125°C, unless otherwise noted, guaranteed by characterization. Parameter Symbol Condition Min Typ Max Units IREGULATOR VCC=0V;VHV=100V 3.8 5 6.1 mA IHV_LKG VCC=5V;VHV=400V 14 22 μA Start-Up Current Source (HV) Internal Regulator Supply Current Leakage Current from HV Supply Voltage Management (VCC) VCC Upper Threshold for Internal Regulator TurnOff VCC Lower Threshold for Internal Regulator TurnOn VCC Hysteresis between Regulator On/Off VCC Lower Threshold for IC Shutdown VCC Hysteresis between Regulator Off/IC Shutdown VCC Lower Threshold at which the Protection Phase Ends Internal IC Consumption Internal IC Consumption, Latch-Off Phase Internal MOSFET (HV to CS) Breakdown Voltage On-State Resistance VCCOFF VCC Rising Edge 4.3 4.65 5 V VCCON VCC Falling Edge 4.10 4.40 4.75 V 0.15 0.24 0.32 V 3.0 3.4 3.8 V 0.93 1.25 1.60 V 1.90 2.35 2.80 V VCC=4.6V, fsw=63kHz, D=56% 350 400 μA VCC=5V 18 32 μA VCCHYS VCCSTOP VCC Falling Edge VCCHYS-STOP VCCPRO ICC ICC_LATCH VCC Falling Edge VBR RON 500 V IHV=10mA, TJ =25°C 8.5 12 Ω VCC= VCCSTOP +50mV, ID=10mA, TJ =25°C 8.5 12 Ω 0.46 0.52 V Current Sampling Management (CS) Peak Current Limit at Normal Operation Leading Edge Blanking Feedback Threshold to Turn On MOSFET Minimum Off-Time Limitation at Normal Operation MP4068 Rev. 1.01 7/30/2015 VLIMIT 0.40 tLEB 200 ns VREF 0.186 0.195 0.204 V tOFF_MIN 5.4 7 8.5 μs www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2015 MPS. All Rights Reserved. 5 MP4068 – HIGH PF, NON-ISOLATED, TRIAC DIMMABLE LED DRIVER ELECTRICAL CHARACTERISTICS (continued) Typical values are VCC =5V, TJ = 25°C, unless otherwise noted. Minimum and maximum values are at VCC =5V, TJ = -40°C to +125°C, unless otherwise noted, guaranteed by characterization. Parameter Maximum On-Time Limitation Ratio of Max_on/Min_off Symbol tON_MAX σ Condition Min 6.7 1.09 Typ 9 1.29 Max 11.5 1.5 Units μs 1.89 2.0 2.15 V 32 μs Protection Input (OVF) Threshold to Trigger OVP VOVP Time Constraint on OVP Comparator tOVP 21 TSTART TSD 145 160 °C °C THYS 50 °C Thermal Protection Power De-Rating Threshold (5) Thermal Shutdown Threshold (5) Thermal Shutdown Recovery Hysteresis (5) Notes: 5) Guaranteed by characterization. MP4068 Rev. 1.01 7/30/2015 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2015 MPS. All Rights Reserved. 6 MP4068 – HIGH PF, NON-ISOLATED, TRIAC DIMMABLE LED DRIVER TYPICAL CHARACTERISTICS MP4068 Rev. 1.01 7/30/2015 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2015 MPS. All Rights Reserved. 7 MP4068 – HIGH PF, NON-ISOLATED, TRIAC DIMMABLE LED DRIVER TYPICAL PERFORMANCE CHARACTERISTICS Performance waveforms are tested on the evaluation board of the Design Example section. VIN = 120VAC, VOUT = 50V, IOUT=160mA, L = 1mH, TA = 25°C, unless otherwise noted. MP4068 Rev. 1.01 7/30/2015 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2015 MPS. All Rights Reserved. 8 MP4068 – HIGH PF, NON-ISOLATED, TRIAC DIMMABLE LED DRIVER TYPICAL PERFORMANCE CHARACTERISTICS (continued) Performance waveforms are tested on the evaluation board of the Design Example section. VIN = 120VAC, VOUT = 50V, IOUT=160mA, L = 1mH, TA = 25°C, unless otherwise noted. MP4068 Rev. 1.01 7/30/2015 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2015 MPS. All Rights Reserved. 9 MP4068 – HIGH PF, NON-ISOLATED, TRIAC DIMMABLE LED DRIVER TYPICAL PERFORMANCE CHARACTERISTICS (continued) Performance waveforms are tested on the evaluation board of the Design Example section. VIN = 120VAC, VOUT = 50V, IOUT=160mA, L = 1mH, TA = 25°C, unless otherwise noted. MP4068 Rev. 1.01 7/30/2015 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2015 MPS. All Rights Reserved. 10 MP4068 – HIGH PF, NON-ISOLATED, TRIAC DIMMABLE LED DRIVER PIN FUNCTIONS Pin # Pin # SOIC8-7A SOIC-8 EP Name 1 1 VCC 2,5,6 3 GND 3 2 OVF 4 4 CS 8 7 HV 5,6,8 NC MP4068 Rev. 1.01 7/30/2015 Description Power Supply. Supply power for all the control circuits. Typically, connect VCC to an external 2.2uF capacitor. Ground. Virtual Ground of the IC. Output Voltage Feedback. The over-voltage condition is detected on OVF. When the voltage on OVF exceeds the VOVP (after a blanking time), the OVP is triggered, and the chip shuts down. Current Sense of the Internal Power MOSFET. Connect a resistor from CS to GND to sense the current through the inductor. When the voltage on CS exceeds 0.46V, the internal MOSFET is turned off. If the start-up time exceeds the maximum on time (9us), the internal MOSFET is turned off (even though the voltage on CS has not reached 0.46V). High-Voltage Input of the Internal Power MOSFET. HV is also the input of the internal high-voltage current source. No Connection. Do NOT connect. www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2015 MPS. All Rights Reserved. 11 MP4068 – HIGH PF, NON-ISOLATED, TRIAC DIMMABLE LED DRIVER BLOCK DIAGRAM FIGURE 1. Functional Block Diagram MP4068 Rev. 1.01 7/30/2015 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2015 MPS. All Rights Reserved. 12 MP4068 – HIGH PF, NON-ISOLATED, TRIAC DIMMABLE LED DRIVER OPERATION The MP4068 is a highly integrated and costeffective TRIAC dimmable LED driver with a high power factor (PF). Minimal external components make the MP4068 a competitive IC in low-line (120VAC) input, non-isolated applications, especially for small form factor applications. Hybrid operation mode achieves both good dimming performance and an accurate output current. The power factor is higher than 0.7 in most applications to eliminate the harmonic pollution on AC line. The integrated high-voltage regulator enables fast start-up without any perceptible delay. The power de-rating function at high temperatures protects the IC from thermal damage. When the voltage on VCC drops below VCCSTOP (3.4V, typically), the IC stops working, and the internal high-voltage regulator recharges the VCC capacitor. Hybrid Operation Mode To achieve smooth TRIAC dimming performance, the MP4068 implements an MPS proprietary hybrid operation mode, in which the IC self-adjusts the internal PWM control mode between CCM and DCM during different times of the AC cycle. The hybrid operation mode actively maintains the latching current and holding current of the leading edge TRIAC, and it enables good power factor. Also, the hybrid operation mode achieves the small dimming duty condition. The IC works in CCM during the entire dimming on time when the dimmer is set to a small dimming duty. The higher and smoother input current achieves excellent dimming performance. Power Supply The IC is self supplied by the internal highvoltage regulator (which is drawn from the drain). The IC starts switching and the internal high-voltage regulator turns off as soon as the voltage on VCC reaches VCCOFF (4.65V, typically). When the voltage on VCC falls below VCCON (4.4V, typically), the internal highvoltage regulator turns on again to charge the external VCC capacitor. A small capacitor (several μF) is recommended. In TRIAC dimming applications, the internal high-voltage regulator works only when the dimmer is on and cannot afford enough power supply for the chip, so an external charging circuit is recommended (see Fig. 2). When OVP occurs, the MP4068 stops working, and an 18μA internal current source discharges the VCC capacitor. After VCC drops below VCCPRO (2.35V, typically), the internal highvoltage regulator re-charges the VCC capacitor again. The re-start time can be calculated by the following equation: MP4068 Rev. 1.01 7/30/2015 MP4068 R1 VCC C2 C1 D1 OVF L GND LED+ FIGURE 2. VCC Charging Circuit trestart = CVcc × Vcc − 2.35V 4.65V − 2.35V + CVcc × 18μA 5mA Fig. 3 shows the typical waveform with VCC under-voltage lockout. VCC Internal Voltage Regulator VCC OFF VCC ON ON VCC STOP OFF Driving Signal FIGURE 3. VCC Under-Voltage Lock Out (UVLO) Constant Current Operation The MP4068 is a highly integrated driver. The internal feedback logic responds to the internal sample and hold circuit to achieve constant output-current regulation. The voltage of the internal sampling capacitor (VFB) is compared to the internal reference (0.195V). When the sampling capacitor voltage (VFB) falls below the reference voltage (which indicates an insufficient output current), the integrated MOSFET is www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2015 MPS. All Rights Reserved. 13 MP4068 – HIGH PF, NON-ISOLATED, TRIAC DIMMABLE LED DRIVER turned on. The on period is determined by the peak current limit. After the on period elapses, the integrated MOSFET is turned off (see Fig. 4). FIGURE 5. tminoff at Start-Up Thermal Protection (TSD) FIGURE 4. VFB vs IOUT By monitoring the internal sampling capacitor voltage, the output current can be regulated. The output current is determined by the following equation: IO = 0.195V R1 The peak current can be calculated as follows: IPeak = 0.46V R1 Where R1 is the sense resistor. Minimum Operating Frequency Limit The MP4068 incorporates a minimum operating frequency (22kHz) to eliminate audible noise when the frequency is less than 20kHz. When the operating frequency is less than 22kHz, the internal peak current regulator will decrease the peak current value to keep the operating frequency constant (about 22kHz). Minimum Off-Time Limit A minimum off-time limit is implemented. During normal operation, the minimum off-time limit is 7μs. During the start-up period, the minimum off-time limit is shortened gradually from 24μs to 12μs to 7μs (see Fig. 5). Each minimum off time maintains a 32 switching cycle. This softstart function enables a safe start-up. MP4068 Rev. 1.01 7/30/2015 To prevent the IC and system from thermal damage, the MP4068 reduces the reference to decrease the output current. This limits the temperature rising speed of the IC when the junction temperature exceeds 145°C. Typically, the output current drops to around 20% when the IC temperature rises to 160°C. Once the junction temperature exceeds 160°C, the MP4068 shuts down the switching cycle. As soon as the junction temperature drops below 110°C, the power supply resumes operation. During the thermal shutdown condition, the VCC is discharged to VCCPRO, and then it is recharged by the internal high-voltage regulator. Over-Voltage Protection (OVP) When the MOSFET turns off, if VOVF is higher than VOVP, the MP4068 stops working, and a restart cycle begins. When OVP occurs, the chip works in hiccup mode; the MP4068 monitors the OVF voltage continuously, and the VCC voltage discharges and re-charges repeatedly. The MP4068 resumes operation once the fault disappears. Short-Circuit Protection (SCP) When an LED short circuit occurs, the switching off time is extended. Due to the minimum operating frequency limit, the IC reduces automatically the switching frequency and achieves close loop control. Then the output power at this condition is limited at a safe range. The MP4068 resumes working in normal operation once the short circuit is released. www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2015 MPS. All Rights Reserved. 14 MP4068 – HIGH PF, NON-ISOLATED, TRIAC DIMMABLE LED DRIVER Leading Edge Blanking (LEB) There are parasitic capacitances in the circuit which can cause a high-current spike during the turn-on period of the internal MOSFET. In order to avoid premature termination of the switching pulse, an internal leading edge blanking (LEB) unit is employed. During the blanking time, the current comparator is disabled and blocked from turning off the internal MOSFET (see Fig. 6). MP4068 Rev. 1.01 7/30/2015 VLimit TLEB t FIGURE 6. Leading Edge Blanking (LEB) www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2015 MPS. All Rights Reserved. 15 MP4068 – HIGH PF, NON-ISOLATED, TRIAC DIMMABLE LED DRIVER APPLICATION INFORMATION Component Selection Inductor The MP4068 has a minimum off-time limit. The inductor current ripple at CCM is determined by the inductor value and the minimum off-time limit. The current ripple is limited to 80% to get a tradeoff between the PF and dimming performance. The inductance value can be calculated as follows: L= MP4068 VCC OVF The diode should have a maximum reversevoltage rating, which is greater than the maximum input voltage. The current rating of the diode is determined by the output current, which should be larger than 1.5 to 2 times the output current. Slow diodes cause excessive leading edge current spikes during start-up, which is not acceptable. Long reverse-recovery time of the freewheeling diode can also affect the efficiency and the circuit operation. An ultrafast diode (trr