MP4021 Universal AC Input, Isolated, Primary-Side Control LED Controller with Active PFC The Future of Analog IC Technology PRELIMINARY SPECIFICATIONS SUBJECT TO CHANGE MPS CONFIDENTIAL AND PROPRIETARY INFORMATION –3CEMS USE ONLY The MP4021 is a primary-side-control offline LED lighting controller which can achieve high power factor and accurate LED current for an isolate lighting application in a single stage converter. The proprietary real current control method can control the LED current accurately from the primary side information. It can significantly simplify the LED lighting system design by eliminating the secondary side feedback components and the optocoupler. F The extremely low start-up current and the quiescent current can reduce the power consumption thus lead to an excellent efficiency performance. N O The multi-protection function of MP4021 can greatly enhance the system reliability and safety. The MP4021 features over-voltage protection, short-circuit protection, cycle-by-cycle current limit, VCC UVLO and auto-restart overtemperature protection. S C The MP4021 is available in a small SOIC8 package. M TYPICAL APPLICATION EMI filter N MULT COMP O ZCD VCC GATE D • • • • • • • • • • • • T O Real Current Control Without Secondaryfeedback Circuit High Current Accuracy Of Line Regulation High Power Factor:>0.95 Over the Universal Input Boundary Conduction Mode Operation Ultra-low (10µA) Start Up Current Low (1mA) Quiescent Current Input UVLO Cycle-by-cycle Current Limit Over-voltage Protection Short-circuit Protection Over-temperature Protection Available in a SOIC8 Package IA T N E ID The MP4021 integrates power factor correction function and works in boundary conduction mode for reducing the MOSFET switching losses. P L FEATURES DESCRIPTION • • • T U B I APPLICATIONS Isolated, Solid State Lighting Industrial and Commercial Lighting Residential Lighting E R “MPS” and “The Future of Analog IC Technology” are Registered Trademarks of Monolithic Power Systems, Inc. T The MP4021 is under patent pending. D IS FB/NC GND CS MP4021 MP4021 Rev.0.81 www.MonolithicPower.com 12/2/2010 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. Preliminary Specifications Subject to Mobile:13632922201 QQ:372669079 Futurea 1 MP4021—PRIMARY SIDE CONTROL OFFLINE LED CONTROLLER WITH ACTIVE PFC PRELIMINARY SPECIFICATIONS SUBJECT TO CHANGE MPS CONFIDENTIAL AND PROPRIETARY INFORMATION –3CEMS USE ONLY ORDERING INFORMATION Part Number* Package SOIC8 MP4021DS L Top Marking Free Air Temperature (TA) MP4021 -40°C to +85°C IA * For Tape & Reel, add suffix –Z (e.g. MP4021DS–Z); For RoHS Compliant Packaging, add suffix –LF (e.g. MP4021DS–LF–Z) T PACKAGE REFERENCE 7 N 6 GND 5 CS TOP VIEW MULT 1 ZCD 2 VCC 3 GATE 4 ID F N O E 8 E COMP FB T SOIC8 R U IB (4) ABSOLUTE MAXIMUM RATINGS (1) Thermal Resistance Input Voltage VCC ..........................-0.3V to +30V Analog Inputs and Outputs ...............-0.3V to 8V ZCD Pin Maximum Current...........-50mA~10mA Max. Gate Current .................................... ±1.2A Continuous Power Dissipation (TA = +25°C) (2) SOIC8 ........................................................ 1.3W Junction Temperature ...............................150°C Lead Temperature ....................................260°C Storage Temperature............... -65°C to +150°C SOIC8 ....................................96 ...... 45 ... °C/W P S M C T O Recommended Operating Conditions (3) Supply Voltage VCC ........................10.3V to 23V Operating Junct. Temp (TJ)...... -40°C to +125°C O D N S I T 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 will cause excessive die temperature, and the regulator will 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 operation conditions. 4) Measured on JESD51-7 4-layer board. D MP4021 Rev.0.81 www.MonolithicPower.com 12/2/2010 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. Preliminary Specifications Subject to Mobile:13632922201 QQ:372669079 Futurea 2 MP4021—PRIMARY SIDE CONTROL OFFLINE LED CONTROLLER WITH ACTIVE PFC PRELIMINARY SPECIFICATIONS SUBJECT TO CHANGE MPS CONFIDENTIAL AND PROPRIETARY INFORMATION –3CEMS USE ONLY ELECTRICAL CHARACTERISTICS VCC = 14V, TA = +25°C, unless otherwise noted. Parameter Supply Voltage Operating Range Turn On Threshold Turn Off Threshold Hysteretic Voltage Clamp Voltage Supply Current Start up Current Quiescent Current Operating Current Multiplier Operation Range Gain (5) Symbol VCC VCC_on VCC_off VCC_hys Vz Transconductance GEA O Voltage Gain 10.3 11 7 3.2 ID Lower clamp Voltage Max Source Current S Max Sink Current P C VCOMP_H S I ICOMP TLEB Current sense clamp voltage VCS_clamp Zero Current Detector T O Zero Current Detect threshold VZCD_T Zero Current Detect Hystestic VZCD_Hy Over-voltage Threshold VZCD_OVP Minimum off time Toff_min Starter Start timer period O Gate Driver Output clamp voltage Max source current N Tstart D D Vgate-clamp V V V V V 30 2 5 µA mA mA 0.6 0.386 0.4 0.414 2.4 Falling edge 1us delay after turn-off 23 13 8.2 3.8 3 0.8 0.7 ICOMP Units 0 0.5 E T U IB V 1/V V 100 µA/V 400 V/V R T VCOMP_L Leading edge blanking time Max sink current 20 1 2 5.3 Current Sense Comparator M T 12 7.6 Max 30 VEA Upper clamp Voltage L Typ IA N E F N VFB After turn on VCC=11V No switch Fs =70kHz VMULT K Feedback Voltage Min ICC=20mA Istartup Iq Icc Error Amplifier Condition 5.65 6 V 0.9 1.1 V 75 µA -200 µA 280 ns 2.9 3.4 V 0.35 V 550 mV 5.2 5.5 5.8 V 2 3.5 5 µs 130 11 13 µs 15 V Igate-source 1 A Igate-sink -1.2 A Notes: 5) The multiplier output is given by: Vcs=K•Vmult• (Vcomp-0.9) MP4021 Rev.0.81 www.MonolithicPower.com 12/2/2010 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. Preliminary Specifications Subject to Change © 2010 MPS. All Rights Reserved. 3 MP4021—PRIMARY SIDE CONTROL OFFLINE LED CONTROLLER WITH ACTIVE PFC PRELIMINARY SPECIFICATIONS SUBJECT TO CHANGE MPS CONFIDENTIAL AND PROPRIETARY INFORMATION –3CEMS USE ONLY PIN FUNCTIONS Pin # Name 1 MULT 2 ZCD 3 VCC 4 GATE 5 CS 6 GND 7 FB/NC 8 IA One of the input pin of the internal multiplier. Connects this pin to the tap of resistor divider from the rectified voltage of the AC line. The half-wave sinusoid signal in this pin is provided a reference signal for the internal current control loop. Zero current detection pin. A negative going edge triggers the turn on signal of the external MOSFET, connects this pin through a resistor divider from the auxiliary winding to GND. Over-voltage condition is detected through ZCD, if ZCD voltage is higher than the overvoltage-protection (OVP) threshold after a blanking time 1us, the over-voltage condition is detected. Supply voltage pin. This pin supply power both for control signal and the gate drive signal. Connect this pin to an external bulk capacitor of typically 22uF with a 100pF ceramic cap to reduce the noise. Gate drive output pin. The totem pole output stage is able to drive high power MOSFET with a peak current of 1A source capability and 1.2A sink capability. The high level voltage of this pin is clamped to 13V to avoid excessive gate drive voltage. Current sense pin. The MOSFET current is sensed via a resistor, the resulting voltage compared to the internal sinusoid shaped current reference signal to determine when the MOSFET turns off. A feed-forward from the rectified voltage of the AC line is recommended to add to get an excellent line regulation. If the voltage in this pin is higher than the current limit threshold 2.8V after some blanking time in the turning on interval, the gate signal will be turned off. N O C N E ID F T E T U IB R Ground pin. Current return of the control signal and the gate drive signal. T Feedback signal Pin. If using primary side control, this pin can be NC. S COMP P M L Pin Function S I Loop Compensation pin. Connects a compensation network to stabilize the LED driver and get an accurate LED current of the LED driver. O D N T O D MP4021 Rev.0.81 www.MonolithicPower.com 12/2/2010 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. Preliminary Specifications Subject to Change © 2010 MPS. All Rights Reserved. 4 MP4021—PRIMARY SIDE CONTROL OFFLINE LED CONTROLLER WITH ACTIVE PFC PRELIMINARY SPECIFICATIONS SUBJECT TO CHANGE MPS CONFIDENTIAL AND PROPRIETARY INFORMATION –3CEMS USE ONLY TYPICAL PERFORMANCE CHARACTERISTICS VIN =110VAC, 5 LEDs in series, Io=500mA, Vo=16V, Lm=2.2mH, Np:Ns:Naux =144:24:24 IC Consumption vs. VCC at operation IO Line Regulation vs. VIN I O REGULATION 2.2 2 1.8 1.6 0.9 3.00% 0.8 0.7 1.00% 0.00% 1.2 -4.00% 9 11 13 15 17 -5.00% 19 80 ID 130 9kHz S M P F N Conducted EMI 1 PK MAXH 2 AV MAXH 180 V IN (V) V CC (V) 0.6 0.5 0.4 0.3 0.2 THD 0 230 80 O C S I D OVP, LED Load open when working ILED 500mA/div. D O N ILED 500mA/div. VCC 10V/div. Vcomp 5V/div. Vgate 10V/div. 230 280 T U IB R T VIN 100V/div. T O 180 V IN (V) IIN 100mA/div. VCC 6DB 10V/div. Vcomp 2V/div. Vgate 10V/div. 30MHz 130 Steady State TDS ILED 500mA/div. E 0.1 Steady State VIN Startup VCC 5V/div. Vcomp 2V/div. Vgate 10V/div. N E -3.00% PF T 2.00% -2.00% 1.4 1 1 4.00% -1.00% L IA 5.00% PF & THD 2.4 PF & THD vs. VIN SCP,LED+ Short to LEDwhen working ILED 500mA/div. VCC 10V/div. Vcomp 5V/div. Vgate 10V/div. MP4021 Rev.0.81 www.MonolithicPower.com 12/2/2010 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. Preliminary Specifications Subject to Change © 2010 MPS. All Rights Reserved. 5 MP4021—PRIMARY SIDE CONTROL OFFLINE LED CONTROLLER WITH ACTIVE PFC PRELIMINARY SPECIFICATIONS SUBJECT TO CHANGE MPS CONFIDENTIAL AND PROPRIETARY INFORMATION –3CEMS USE ONLY FUNCTION DIAGRAM L N:1 IA EMI filter Current control Gate driver Control PWM/ PFC Multiplier E ID Current sense Current Sense COMP Latch off or Restart OTP FB/NC O Real Current Control P S M C Zero current detection GND OVP F N Protection Current LImit CS T N GATE MULT T U IB Power supply UVLO VCC R Power Supply T ZCD Zero Current Detection E S I Figure 1—MP4021 Function Block Diagram O D N T O D MP4021 Rev.0.81 www.MonolithicPower.com 12/2/2010 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. Preliminary Specifications Subject to Change © 2010 MPS. All Rights Reserved. 6 MP4021—PRIMARY SIDE CONTROL OFFLINE LED CONTROLLER WITH ACTIVE PFC PRELIMINARY SPECIFICATIONS SUBJECT TO CHANGE MPS CONFIDENTIAL AND PROPRIETARY INFORMATION –3CEMS USE ONLY OPERATION The MP4021 is a primary side control offline LED controller which incorporates all the features for high performance LED lighting. LED current can be accurately controlled with the real current control method form the primary side information. High power factor can also be achieved to eliminate the pollution to the AC line. VAC line+NVOUT Boundary Conduction Mode Operation F N During the external MOSFET on time (tON), the rectified input voltage is applied across the primary side inductor (Lm) and the primary current increases linearly from zero to the peak value (Ipk). When the external MOSFET turns off, the energy stored in the inductor forces the secondary side diode to be turn-on, and the current of the inductor begins to decrease linearly from the peak value to zero. When the current decreases to zero, the parasitic resonant of inductor and all the parasitic capacitance makes the MOSFET drain-source voltage decrease, this decreasing is also reflected on the auxiliary winding (see Figure 2). The zero-current detector in ZCD pin generates the turn on signal of the external MOSFET when the ZCD voltage is lower than 0.35V and ensures the MOSFET turn on at a valley voltage (see Figure 3). P S M O C O D N T O T N Inductor current E ID The MP4021 will shutdown as soon as VCC pin is lower than 7.6V. IA VAC line Start Up Initially, VCC of the MP4021 is charged through the start up resistor from the AC line, when VCC reaches 12V, the control logic works and the gate drive signal begins to switch. Then the power supply is taken over by the auxiliary winding. L VDS Valley turn on Ipk Ton Toff E VZCD T 0 U IB Figure 2—Boundary Conduction Mode Auxiliary Winding + Vcc R T Valley signal S I RZCD1 ZCD 0.35V RZCD2 CZCD Figure 3—Zero Current Detector D As a result, there are virtually no primary switch turn-on losses and no secondary diode reverserecover losses. It ensures high efficiency and low EMI noise. Real Current Control The proprietary real current control method allows the MP4021 controlling the secondary side LED current from the primary side information. The output LED mean current can be calculated approximately as: Io ≈ N ⋅ VFB 2 ⋅ Rs N—Turn ratio of primary side to secondary side VFB—The feedback reference voltage (typical 0.4) Rs—The sensing resistor connected between the MOSFET source and GND. MP4021 Rev.0.81 www.MonolithicPower.com 12/2/2010 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. Preliminary Specifications Subject to Change © 2010 MPS. All Rights Reserved. 7 MP4021—PRIMARY SIDE CONTROL OFFLINE LED CONTROLLER WITH ACTIVE PFC PRELIMINARY SPECIFICATIONS SUBJECT TO CHANGE MPS CONFIDENTIAL AND PROPRIETARY INFORMATION –3CEMS USE ONLY on, if ZCD fails to send out another turn on signal Power Factor Correction after 130µs, the starter will automatically send The MULT pin is connected to the tap of the out the turn on signal which can avoid the IC resistor divider from the rectified instantaneous unnecessary shut down by ZCD missing line voltage and fed as one input of the Multiplier. detection. The output of the multiplier will be shaped as sinusoid too. This signal provides the reference Minimum Off Time for the current comparator and comparing with The MP4021 operates with variable switching the primary side inductor current which sets the frequency, the frequency is changing with the primary peak current shaped as sinusoid with the input instantaneous line voltage. To limit the input line voltage. High power factor can be maximum frequency and get a good EMI achieved. performance, MP4021 employs an internal Multiplier output minimum off time limiter—3.5µs, show as figure 6. F N IA T N E ID Inductor current L U IB GATE Figure 4—Power Factor Correction Scheme O The maximum voltage of the multiplier output to the current comparator is clamped to 2.9V to get a cycle-by-cycle current limitation. C VCC Under-voltage Lockout S 12V P M Auxiliary Winding Takes Charge And Regulates the VCC Gate Switching Pulses O D T O Protection happens 8V N Toff >3.5µs R 1µs/div T Figure 6—Minimum Off Time When the VCC voltage drops below UVLO threshold 7.6V, the MP4021 stops switching and totally shuts down, the VCC will restart charging by the external start up resistor from AC line. Figure 5 shows the typical waveform of VCC under-voltage lockout Vcc E T ZCD S I Leading Edge Blanking In order to avoid the premature termination of the switching pulse due to the parasitic capacitance discharging at MOSFET turning on, an internal leading edge blanking (LEB) unit is employed between the CS Pin and the current comparator input. During the blanking time, the path, CS Pin to the current comparator input, is blocked. Figure 7 shows the leading edge blanking. D VCS TLEB =280nS Figure 5—VCC Under-Voltage Lockout Auto Starter The MP4021 integrates an auto starter, the starter starts timing when the MOSFET is turned t Figure 7—Leading Edge Blanking MP4021 Rev.0.81 www.MonolithicPower.com 12/2/2010 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. Preliminary Specifications Subject to Change © 2010 MPS. All Rights Reserved. 8 MP4021—PRIMARY SIDE CONTROL OFFLINE LED CONTROLLER WITH ACTIVE PFC PRELIMINARY SPECIFICATIONS SUBJECT TO CHANGE MPS CONFIDENTIAL AND PROPRIETARY INFORMATION –3CEMS USE ONLY VZCD Output Over-Voltage Protection (OVP) Output over voltage protection can prevent the components from damage in the over voltage condition. The positive plateau of auxiliary winding voltage is proportional to the output voltage, the OVP uses the auxiliary winding voltage instead of directly monitoring the output voltage, the OVP sample is shown in figure 8. Once the ZCD pin voltage is higher than 5.5V, the OVP signal will be triggered and latched, the gate driver will be turned off and the IC work at quiescent mode, the VCC voltage dropped below the UVLO which will make the IC shut down and the system restarts again. The output OVP setting point can be calculated as: Vout _ ovp ⋅ Naux R ZCD2 ⋅ = 5.5 Nsec R ZCD1 + R ZCD2 N Naux—The auxiliary winding turns O Nsec—The secondary winding turns Auxiliary Winding C + S Vcc P Latch M OVP signal Figure 8—OVP Sample Unit T O To avoid the mis-trigger OVP by the oscillation spike after the switch turns off, the OVP sampling has a TOVPS blanking period, typical 1us, shown in figure 9. O D N When the output short circuit happens, the positive plateau of auxiliary winding voltage is also near zero, the VCC can not be held on and it will drop below VCC UVLO. The IC will shut down and restart again. E N E T Thermal Shut Down To prevent from any lethal thermal damage, when the inner temperature exceeds 150DegC, the MP4021 shuts down switching cycle and latched until VCC drop below UVLO and restart again. Design Example U IB R For the design example, please refer to MPS application note AN038 for the detailed design procedure and information. T S I CZCD 1 uS Blanking T Output Short Circuit Protection ZCD RZCD2 TOVPS Figure 9—ZCD Voltage and OVP Sample RZCD1 5.5V L IA 0V ID F Vout-ovp—Output over voltage protection point Sampling Here D MP4021 Rev.0.81 www.MonolithicPower.com 12/2/2010 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. Preliminary Specifications Subject to Mobile:13632922201 QQ:372669079 Futurea 9 MP4021—PRIMARY SIDE CONTROL OFFLINE LED CONTROLLER WITH ACTIVE PFC PRELIMINARY SPECIFICATIONS SUBJECT TO CHANGE MPS CONFIDENTIAL AND PROPRIETARY INFORMATION –3CEMS USE ONLY L PACKAGE INFORMATION SOIC8 0.189(4.80) 0.197(5.00) 8 5 T 0.063(1.60) 0.150(3.80) 0.157(4.00) PIN 1 ID 1 0.228(5.80) 0.244(6.20) F TOP VIEW S P N O C GAUGE PLANE 0.010(0.25) BSC 0o-8o 0.016(0.41) 0.050(1.27) O DETAIL "A" D N T O 0.213(5.40) S I D E T U IB R T SEE DETAIL "A" 0.050(1.27) BSC 0.010(0.25) x 45o 0.020(0.50) 0.050(1.27) RECOMMENDED LAND PATTERN 0.053(1.35) 0.069(1.75) SEATING PLANE 0.004(0.10) 0.010(0.25) FRONT VIEW M N E D I 4 0.013(0.33) 0.020(0.51) IA 0.024(0.61) 0.0075(0.19) 0.0098(0.25) SIDE VIEW 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. 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. MP4021 Rev. 0.81 www.MonolithicPower.com 12/2/2010 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. Preliminary Specifications Subject to Mobile:13632922201 QQ:372669079 Futurea 10