MP1011A MPS | Alldatasheet

Document overview

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Technical content

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

Applications

LCD backlight inverter for large portable or desktop display. Typical Application Circuit:

Cold Cathode Fluorescent Lamp Driver MPS, Inc 3777 Stevens Creek Blvd. Revision 1.7 Suite 400 Santa Clara, 95051-7364 USA April, 2001 Tel (408) 243-0088, Fax (408) 243-0099 www.monolithicpower.com 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 Recommended Operating Conditions: Input Voltage Vcc 6.0V to 22V Brightness Voltage 0 to 2.0V Enable 0 to 5.0 V Operating Frequency 20KHz to 90KHz Operating Temperature -20° C to + 85° C Storage Temperature –55° C to 150° C Electrical Characteristics (Unless otherwise specified Vcc=12v, Ta=25 ° C) Parameters Symbol Condition Min Typ Max Units Reference Voltage Output Voltage Vref Iref=3mA 4.85 5.1 5.35 V Reference Current Iref 3.0 mA Line Regulation 6.5V < VCC < 22 V 30 mV Load Regulation 0 < Ire < 3.0 mA 30 mV Voltage Supply Supply Current (quiescent) Icc (off) 10 µA Supply Current (operating) Icc (on) 6.0V < Vcc < 22V 1.8 2.5 mA Operating Range Vcc (Note 2) 6.0 22 V Shutdown Logic Thermal Shutdown 145 °C Open Lamp Detect Vol 1.0 1.2 1.4 V Enable Voltage Low Vil 0.6 V Enable Voltage High Vih 2.0 V Burst Voltage Low Vil 0.8 V Burst Voltage High Vih 2.4 V Output Drivers On Resistance Ron (Note 1) 0.10 0.12 0.15 Ω Short Circuit Current Isc 4 A Operating Frequency 20 60 90 KHz Zero-Crossing Voltage Vzc 0 6 10 mV Ton(min) Vcomp=0V, Vcc = 22V 500 625 750 nS Ton(min) Vcomp=0V, Vcc = 6V 900 1200 1500 nS Brightness Control Sense Full Brightness Vsense Vbright= 2.0V 357 375 393 mV Sense Full Dim Vsense Vbright= 0V 83 92 101 mV Lamp Current Regulation 6.0v < Vcc < 22v 2 5 % Note 1: This parameter is guaranteed by design. Note 2: See Leakage Inductance Guide lines for Minimum Operating Voltage (Table 2).

Cold Cathode Fluorescent Lamp Driver MPS, Inc 3777 Stevens Creek Blvd. Revision 1.7 Suite 400 Santa Clara, 95051-7364 USA April, 2001 Tel (408) 243-0088, Fax (408) 243-0099 www.monolithicpower.com Pin Description Pin # Pin Name Pin Function

1 Bright Dimming Control: 0 volts is full Dim and 2V is full brightness

2 I sense Lamp current feedback sense input.

3 Burst 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. 4 Enable The enable will turn the chip on/off. Do not float this pin.

5 Vdr Internally generated MOSFET gate drive supply voltage

6 Vcc Power Supply input

7 OutL Output to Load ( tank circuit )

8 NC No Connect

9 PGND Power Ground

10 BstL Regulated output voltage for boost cap on phase L

11 BstR Regulated output voltage for boost cap on phase R

12 PGND Power Ground

13 NC No Connect

14 OutR Output to Load ( tank circuit )

15 Vcc Power Supply input

16 Vdr Internally connected to Vdr (pin 5). This pin must be left open.

17 Vref Reference voltage output

18 Comp Loop compensation cap

19 Open lamp Latching shutdown for open lamp or low battery

20 AGND Small signal ground

Functional Block Diagram: AGND VccL BstRComp A Vr Driver Mp3 Isense CbstR Enable VdrR OutL Mn1 CbstL Mn2 Control Logic Vref A Current Sensing Driver5.1 Volt Regulator Mp1 BstLBright VdrL Driver Driver Vcc

6.2 Volt

Regulator . Vcc OutR Rsense Ton PGND CT PGNDBurst Mp2 VccR Thermal Shutdown Open Lamp Vr

Cold Cathode Fluorescent Lamp Driver MPS, Inc 3777 Stevens Creek Blvd. Revision 1.7 Suite 400 Santa Clara, 95051-7364 USA April, 2001 Tel (408) 243-0088, Fax (408) 243-0099 www.monolithicpower.com Truth Table Enable Burst Output L /Output R L X High Z H H 0 volts ( Standby) L X High Z H L Normal Operation Reference Design for Burst Mode Operation with Open Lamp Regulation and Shutdown C_vccR 10 11 20Bright ISense Burst Enable Vdr VCC OutL NC PGnd_L BstL BstR PGnd_R NC OutR VCC Vdr Vref comp open lamp AGnd CON2 FUSE C_comp MP1011 Cul C_vcc Gnd Enable C_vccL JP1

4 HEADER

D1bC_sd Ren2 C_sense T11 5 4 8 C_vdrL C_olpu See Note Below C_vref Optional. Used to meet UL requirements. D2b Rsense C_opv C_bstR Rser C_en C_ser 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. A A Rul1 Ren1 C_bstL Burst A C_para Lamp(+) Vcc D1a Rsd For additional reference designs, ple ase see MP1011UG demo board user’s guide

Cold Cathode Fluorescent Lamp Driver MPS, Inc 3777 Stevens Creek Blvd. Revision 1.7 Suite 400 Santa Clara, 95051-7364 USA April, 2001 Tel (408) 243-0088, Fax (408) 243-0099 www.monolithicpower.com Table 1 Bill of Materials Item Qty Description Vendor / Part # Designation Resistors 1 1 4.3KΩ , ±5%, SMD, 0805 Rbleed 2 1 100KΩ , ±5%, SMD, 0805 Ren1 3 1 100KΩ , ±5%, SMD, 0805 Ren2 4 2 1MΩ , ±5%, SMD, 0805 Rsd, Rolpu 5 1 140Ω , ±1%, SMD, 0805 Rsense 6 1 1KΩ , ±5%, SMD, 0805 Rser 7 1 2MΩ , ±5%, SMD, 0805 (For UL) Rul1 8 1 280KΩ , ±5%, SMD, 0805 (For UL) Rul2 Capacitors 9 2 10nF, 50V, Y5V, SMD C_bstL, C_bstR 10 2 10nF, 16V, X7R, SMD C_olpu, C_comp 11 1 100pF 50V NPO C_en 12 1 1uF 6.3V X7R C_sd 13 1 6.8nF 16V X7R C_opv 14 1 10pF, 3KV C_para 15 1 0.22uF, 16V, Y5V, (optional) C_sense 16 1 2X.47uF 16V X7R C_ser 17 2 1uF 25V Y5V C_vccR, C_vccL 18 1 10uF, 25V, Y5U, SMD, 1210 C_vcc 19 1 220nF, 10V Y5V, SMD C_vdrL 20 1 0.1uF, 10V, X7R, SMD C_vref 21 1 100nF, 10V, Y5Y, SMD (for UL) Cul Semiconductors 22 4 Diode, BAV99L D1b, D1a, D2b, D2a 23 2 Transistor, bipolar, 2N3904, SMD Q1, Q2 Integrated Circuits 24 1 MP1011A, 20-pin TSSOP Monolithic Power Systems U2 Magnetics 25 1 Transformer* T1 Hardware 26 1 Fuse, 1A F1 *Transformer Sources: Company Part # Location Contact Info Toko BLC103B Saitama-Ken, Japan http://www.toko.co.jp +81-492-791611 Darfon Electronics Corp. Contact Vendor Taoyuan 333, Taiwan +886-3-329-4141 FDK CD-T-0836-520 Yamaguchi, Japan http://www.fdk.co.jp TMP Contact Vendor Taipei, Taiwan +886-2-8667-2081

Cold Cathode Fluorescent Lamp Driver MPS, Inc 3777 Stevens Creek Blvd. Revision 1.7 Suite 400 Santa Clara, 95051-7364 USA April, 2001 Tel (408) 243-0088, Fax (408) 243-0099 www.monolithicpower.com Table 2: Leakage Inductance Guide Lines for Minimum Operating Voltage Minimum Operating Supply Voltage Recommended Maximum Primary Leakage Inductance* 6 38µH 7 42µH 8 45µH 9 47µH 10 49µH ** If the maximum primary leakage cannot be met, consult factory for alternatives . Packaging Information 0.004(0.090) 0.008(0.200) 0.002 (0.050) o o GAGE PLANE 0.252(6.400) 0.259(6.600) 0.039(1.000) 0.047(1.200) 0.007(0.190) 0.012(0.300) 0.246 0.258 0.169 0.177 PIN 1 IDENT 0.019(0.500) 0.031(0.800) 0.018 (0.450) 0.029 (0.750) 0.010 OPTION BTM. E-PIN WITH THAILAND. (4.500) (4.300) (6.250) (6.550) (0.254) 0.031(0.800) 0.041(1.050)