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| MP1011A Cold Cathode Fluorescent Lamp Driver General Description The MP1011A is a Power IC offering a complete solution for driving one or more Cold Cathode Fluorescent Lamps (CCFL). This Power IC converts unregulated DC voltage to a nearly pure sine wave required to ignite and operate the CCFL. Based on proprietary power topology and patented control techniques, it greatly increases the power conversion efficiency. The MP1011A supports both analog and burst mode dimming without any additional external components. The MP1011A offers four distinct performance advantages: 1. More light for less power 2. Small board implementation 3. Low EMI emission 4. Low cost off the shelf components Features * * * * * * * * * * * * * Integrated power switches 6.0 to 22v variable supply voltage with regulated lamp current. Rated 12W power output at 12V input Open lamp regulation Current and Voltage feedback control Logic Level burst mode control Thermal Shutdown Supports Open/Short Lamp protection Soft Start Output is short circuit protected Low lamp operating voltage for increasing transformer or using smaller transformer Allows Burst-Mode Operation No ballast capacitor required Ordering Information Part Number MP1011EMA Package TSSOP 20 pin Temperature -20 C to + 85C Applications LCD backlight inverter for large portable or desktop display. For Tape & Reel use suffix - Z (e.g. MP1011EMA-Z) Typical Application Circuit: MPS, Inc 3777 Stevens Creek Blvd. Suite 400 Santa Clara, 95051-7364 USA Tel (408) 243-0088, Fax (408) 243-0099 www.monolithicpower.com Revision 1.7 April, 2001 1 MP1011A Cold Cathode Fluorescent Lamp Driver Absolute Maximum Ratings: Vcc 25 V Power Dissipation 1.0 W Logic Inputs -0.7 V to 6.8V Thermal resistance 140 C/W Junction Temperature 150 C Lead Temperature (Solder) 260 C Operating Frequency 150KHz Storage Temperature -55 C to 150 C Recommended Operating Conditions: Input Voltage Vcc Brightness Voltage Enable Operating Frequency Operating Temperature 6.0V to 22V 0 to 2.0V 0 to 5.0 V 20KHz to 90KHz -20 C to + 85 C Electrical Characteristics (Unless otherwise specified Vcc=12v, Ta=25 C) Parameters Reference Voltage Output Voltage Reference Current Line Regulation Load Regulation Voltage Supply Supply Current (quiescent) Supply Current (operating) Operating Range Shutdown Logic Thermal Shutdown Open Lamp Detect Enable Voltage Low Enable Voltage High Burst Voltage Low Burst Voltage High Output Drivers On Resistance Short Circuit Current Operating Frequency Zero-Crossing Voltage Ton(min) Ton(min) Brightness Control Sense Full Brightness Sense Full Dim Lamp Current Regulation Symbol Condition Min Typ Max Units Vref Iref Iref=3mA 6.5V < VCC < 22 V 0 < Ire < 3.0 mA 4.85 5.1 5.35 3.0 30 30 V mA mV mV A mA V C V V V V V A KHz mV nS nS mV mV % Icc (off) Icc (on) Vcc 6.0V < Vcc < 22V (Note 2) 1.8 6.0 10 2.5 22 Vol Vil Vih Vil Vih (Note 1) 1.0 2.0 145 1.2 1.4 0.6 0.8 2.4 Ron Isc Vzc 0.10 20 0 500 900 357 83 Vcomp=0V, Vcc = 22V Vcomp=0V, Vcc = 6V Vsense Vsense Vbright= 2.0V Vbright= 0V 6.0v < Vcc < 22v 0.12 4 60 6 625 1200 375 92 2 0.15 90 10 750 1500 393 101 5 Note 1: This parameter is guaranteed by design. Note 2: See Leakage Inductance Guide lines for Minimum Operating Voltage (Table 2). MPS, Inc 3777 Stevens Creek Blvd. Suite 400 Santa Clara, 95051-7364 USA Tel (408) 243-0088, Fax (408) 243-0099 www.monolithicpower.com Revision 1.7 April, 2001 2 MP1011A Cold Cathode Fluorescent Lamp Driver Pin Description Pin # 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Pin Name Bright I sense Burst Enable Vdr Vcc OutL NC PGND BstL BstR PGND NC OutR Vcc Vdr Vref Comp Open lamp AGND Pin Function Dimming Control: 0 volts is full Dim and 2V is full brightness Lamp current feedback sense input. To use for burst mode, the pin is switched between 0V and 5V When not using burst mode, then pin must be tied to ground. The enable will turn the chip on/off. Do not float this pin. Internally generated MOSFET gate drive supply voltage Power Supply input Output to Load ( tank circuit ) No Connect Power Ground Regulated output voltage for boost cap on phase L Regulated output voltage for boost cap on phase R Power Ground No Connect Output to Load ( tank circuit ) Power Supply input Internally connected to Vdr (pin 5). This pin must be left open. Reference voltage output Loop compensation cap Latching shutdown for open lamp or low battery Small signal ground Functional Block Diagram: Rsense A CbstL CbstR Vcc Vcc Bright Vr Comp Isense Vref 6.2 Volt Regulator VdrL BstL VccL OutL OutR VccR BstR VdrR . Driver . Driver Mp1 A1 Mn1 Mp2 Mn2 Mp3 A2 Vr + - 5.1 Volt Regulator Thermal Shutdown + - Driver . . . . . Driver . . Ton C1 CT Control Logic . Current Sensing + - Open Lamp Enable Burst AGND PGND PGND A MPS, Inc 3777 Stevens Creek Blvd. Suite 400 Santa Clara, 95051-7364 USA Tel (408) 243-0088, Fax (408) 243-0099 www.monolithicpower.com Revision 1.7 April, 2001 3 MP1011A Cold Cathode Fluorescent Lamp Driver Truth Table Enable L H L H Burst X H X L Output L /Output R High Z 0 volts ( Standby) High Z Normal Operation Reference Design for Burst Mode Operation with Open Lamp Regulation and Shutdown Q1 Optional. Used to meet UL requirements. Rsd Rolpu Q2 Cul Rul1 Rul2 C_comp C_vref JP1 4 3 2 1 Vcc Burst Enable Gnd F1 C_vcc FUSE C_bstR A 20 19 18 17 16 15 14 13 12 11 4 HEADER C_vccR C_sd C_olpu See Note Below D1a D1 D1b C_opv C_para Rser C_ser 1 T1 5 VCC AGnd OutR NC Vdr comp BstR Vref open lamp PGnd_R Lamp(+) J1 1 2 CON2 PGnd_L MP1011 Enable Burst VCC OutL NC Vdr 4 BstL Rbleed 8 ISense Bright 10 C_bstL 1 2 3 4 5 6 7 8 9 D2b D2a C_sense Rsense C_vccL Ren1 Ren2 C_en A A C_vdrL Note:This circuitry is for 'lamp-out' detection. If this feature is not needed, remove the outlined components, short the upper side of C para to Gnd and short pins 17 and 19 of the MP1011. For additional reference designs, please see MP1011UG demo board user's guide MPS, Inc 3777 Stevens Creek Blvd. Suite 400 Santa Clara, 95051-7364 USA Tel (408) 243-0088, Fax (408) 243-0099 www.monolithicpower.com Revision 1.7 April, 2001 4 MP1011A Cold Cathode Fluorescent Lamp Driver Table 1 Bill of Materials Item 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 Qty Description Resistors 1 4.3K, 5%, SMD, 0805 1 100K, 5%, SMD, 0805 1 100K, 5%, SMD, 0805 2 1M, 5%, SMD, 0805 1 140, 1%, SMD, 0805 1 1K, 5%, SMD, 0805 1 2M, 5%, SMD, 0805 1 280K, 5%, SMD, 0805 Capacitors 2 10nF, 50V, Y5V, SMD 2 10nF, 16V, X7R, SMD 1 100pF 50V NPO 1 1uF 6.3V X7R 1 6.8nF 16V X7R 1 10pF, 3KV 1 0.22uF, 16V, Y5V, (optional) 1 2X.47uF 16V X7R 2 1uF 25V Y5V 1 10uF, 25V, Y5U, SMD, 1210 1 220nF, 10V Y5V, SMD 1 0.1uF, 10V, X7R, SMD 1 100nF, 10V, Y5Y, SMD Semiconductors 4 Diode, BAV99L 2 Transistor, bipolar, 2N3904, SMD Integrated Circuits 1 MP1011A, 20-pin TSSOP Magnetics 1 Transformer* Hardware 1 Fuse, 1A Vendor / Part # Designation Rbleed Ren1 Ren2 Rsd, Rolpu Rsense Rser Rul1 Rul2 C_bstL, C_bstR C_olpu, C_comp C_en C_sd C_opv C_para C_sense C_ser C_vccR, C_vccL C_vcc C_vdrL C_vref Cul D1b, D1a, D2b, D2a Q1, Q2 Monolithic Power Systems U2 T1 F1 (For UL) (For UL) (for UL) *Transformer Sources: Company Toko Darfon Electronics Corp. Part # BLC103B Location Saitama-Ken, Japan Taoyuan 333, Taiwan Yamaguchi, Japan Taipei, Taiwan Contact Vendor CD-T-0836-520 FDK TMP Contact Vendor Contact Info http://www.toko.co.jp +81-492-791611 +886-3-329-4141 http://www.fdk.co.jp +886-2-8667-2081 MPS, Inc 3777 Stevens Creek Blvd. Suite 400 Santa Clara, 95051-7364 USA Tel (408) 243-0088, Fax (408) 243-0099 www.monolithicpower.com Revision 1.7 April, 2001 5 MP1011A Cold Cathode Fluorescent Lamp Driver Table 2: Leakage Inductance Guide Lines for Minimum Operating Voltage Minimum Operating Supply Voltage 6 7 8 9 10 Recommended Maximum Primary Leakage Inductance* 38H 42H 45H 47H 49H If the maximum primary leakage cannot be met, consult factory for alternatives. Packaging Information 0.019(0.500) 0.031(0.800) PIN 1 IDENT 0.169 0.177 (4.300) (4.500) 0.246 0.258 (6.250) (6.550) 1 OPTION BTM. E-PIN WITH THAILAND. 0.252(6.400) 0.259(6.600) 0.039(1.000) 0.047(1.200) GAGE PLANE 0.031(0.800) 0.041(1.050) 0.007(0.190) 0.012(0.300) 0.002 (0.050) 0.006 (0.150) 0.004(0.090) 0.008(0.200) o 0-8 0.010 0.018 (0.450) 0.029 (0.750) (0.254) o 2 MPS, Inc 3777 Stevens Creek Blvd. Suite 400 Santa Clara, 95051-7364 USA Tel (408) 243-0088, Fax (408) 243-0099 www.monolithicpower.com Revision 1.7 April, 2001 6 |
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