MAX8751EVKIT

19-3932; Rev 0; 1/06 MAX8751 Evaluation Kit The MAX8751 evaluation kit (EV kit) is an assembled and tested PC board that demonstrates the MAX8751 low-cost multiple CCFL backlight controller. Lamp brightness is adjustable by an on-board potentiometer. Features ♦ +8V to +24V Input Range ♦ Brightness Adjustable by an On-Board Potentiometer ♦ 10:1 Dimming Range SUPPLIER Component Suppliers ♦ Lamp-Out Detection with Timeout PHONE ♦ Secondary Current Limit with Timeout WEBSITE Central Semiconductor 631-435-1110 www.centralsemi.com Diodes Incorporated 805-446-4800 www.diodes.com Fairchild Semiconductor 888-522-5372 www.fairchildsemi.com JST 847-473-1957 www.jst.com Kemet 864-963-6300 www.kemet.com Murata 770-436-1300 www.murata.com Sumida 847-545-6700 www.sumida.com TDK 847-803-6100 www.component.tdk.com Vishay Semiconductor 402-564-3131 www.vishay.com ♦ Strike Voltage Up to 1.6kV ♦ High Power to Light Efficiency ♦ Fully Assembled and Tested Ordering Information PART MAX8751EVKIT TEMP RANGE IC PACKAGE 0°C to +70°C 32 TQFN-EP* *EP = Exposed paddle. Note: Indicate you are using the MAX8751 when contacting these manufacturers. Component List DESIGNATION QTY C1 C2, C4, C6, C7, C18 C3 C5 1 5 1 1 DESCRIPTION 22µF ±20%, 25V X5R ceramic capacitor (1812) TDK C4532X5R1E226M 0.1µF ±10%, 25V X7R ceramic capacitors (0603) Kemet C0603C104K3RAC Murata GRM188R71E104K TDK C1608X7R1E104K 1µF ±10%, 10V X5R ceramic capacitor (0603) Kemet C0603C105K8RAC Murata GRM188R61A105K TDK C1608X5R1A105K 0.22µF ±10%, 16V X7R ceramic capacitor (0603) Kemet C0603C224K4RAC Murata GRM188R71C224K TDK C1608X7R1C224K DESIGNATION QTY DESCRIPTION 2 0.01µF ±10%, 50V X7R ceramic capacitors (0603) Kemet C0603C103K5RAC Murata GRM188R71H103K TDK C1608X7R1H103K 2 1000pF ±10%, 50V ceramic capacitors (0603) Kemet C0603C102K5RAC Murata GRM188R71H102K TDK C1608X7R1H102K C11, C12 2 12pF ±10%, 3kV HV ceramic capacitors (1808) Kemet C1808C120KHGAC TDK C4520C0G3F120K C13 0 Not installed (0603) 4 100pF ±10%, 3kV HV ceramic capacitors (1808) Kemet C1808C101KHGAC TDK C4520C0G3F101K C8, C19 C9, C10 C14–C17 ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. 1 Evaluates: MAX8751 General Description Evaluates: MAX8751 MAX8751 Evaluation Kit Component List (continued) DESIGNATION QTY C20 C23, C24 CN1–CN4 D1 D2–D11 1 DESCRIPTION 4.7µF ±10%, 25V X7R ceramic capacitor (1206) TDK C3216X7R1E475K 2 2.2µF ±10%, 25V X7R ceramic capacitors (1206) TDK C3216X7R1E225K 4 Shrouded headers for CCFL lamp connection, 3.5mm pin spacing, PC board mount JST SM02B-BHSS-1-TB 1 10 Dual diode, common cathode, 1N4148-type, SOT23 Central Semiconductor CMPD2838 Fairchild Semiconductor MMBD4148CC Diodes, 1N4148-type, SOD123 Central Semiconductor CMHD4448 Diodes Inc. 1N4148W Fairchild Semiconductor MMSD4148 Vishay Semiconductors 1N4148W F1 1 Fuse, 3A, 32V (1206) Littelfuse 0466003 NR J1 1 2 x 5 right-angle female receptacle J2 1 2 x 5 right-angle header JU1, JU3, JU4, JU5 4 3-pin headers JU2, JU6, JU7 3 2-pin headers JU8–JU12 0 Not installed M1 1 2N7002 MOSFET, SOT23 Central Semiconductor 2N7002 Diodes Inc. 2N7002 Fairchild Semiconductor 2N7002 N1–N4 4 n-channel MOSFETs, 8-pin SO Fairchild Semiconductor FDS9412 Q1 1 2N3906-type pnp transistor, SOT23 Central Semiconductor CMPT3906 Diodes Inc. MMBT3906 Vishay Semiconductors MMBT3906 R1 1 10Ω ±5% resistor (0603) R2 1 100kΩ ±1% resistor (0603) 2 DESIGNATION QTY DESCRIPTION R3 1 150kΩ ±1% resistor (0603) R4–R7 0 Not installed (0603) R8 1 15Ω ±5% resistor (0603) R9, R12, R13, R14 4 100kΩ ±5% resistors (0603) R10 1 100kΩ potentiometer (multiturn), 3/8in square R11 1 1kΩ ±5% resistor (0603) R15 1 20kΩ ±5% resistor (0603) R16, R17, R34 3 1MΩ ±5% resistors (0603) R18, R19, R26–R29 6 10kΩ ±5% resistors (0603) R20, R21 2 470kΩ ±5% resistors (0603) R22–R25, R35–R38 8 510kΩ ±5% resistors (1206) R30–R33, R40 5 3.0kΩ ±5% resistors (0603) R39 1 27kΩ ±5% resistor (0603) T1, T2 2 CCFL transformers, 1980:18 Sumida 1348-T009 (CEPH249 style) T3, T4, T5 3 Current balancing transformers, 1:1 Sumida P05NZ-054 U1 1 MAX8751ETJ (32-pin thin QFN, 5mm x 5mm) — 1 PC board MAX8751 evaluation kit — 6 Shunts Quick Start Recommended Equipment Before you begin, you need the following equipment: • A DC power supply capable of supplying a voltage between +8V to +24V at 5A to power the MAX8751 board • Four CCFL lamps with the following specifications: a) Maximum RMS strike voltage ≤ 1.6kV b) RMS lamp current ≤ 6mA c) Input power ≤ 4W WARNING! High voltages are present on this evaluation kit. Use caution when making connections and applying power. Do not turn on the power until all connections are complete. ______________________________________________________________________________________ MAX8751 Evaluation Kit Slave Mode Operation Place a shunt on JU2 to enable slave mode operation when using a daisy-chain configuration. See the DaisyChain Configuration section for more details. See Table 2 for jumper settings. Detailed Description Brightness The brightness of the lamp is adjustable using potentiometer R10. Brightness Control Select Input Jumper JU1 connects the brightness control select input (the SEL pin) to either VCC or GND. Connecting SEL to VCC (JU1 = 1-2) enables brightness control using an external sync signal. Connecting SEL to GND (JU1 = 2-3) enables analog control where the brightness is adjusted with an analog voltage on the CNTL pin. See Table 2 for jumper settings. Shutdown A shunt installed on JU3 2-3 places the MAX8751 in shutdown mode. See Table 2 for jumper settings. Phase Shift (PS1 and PS2) Jumpers JU4 and JU5 set the phase shift for daisy chaining up to five MAX8751s. See Table 1 for the phase shift settings. HSYNC Main switching frequency sync input. The switching frequency synchronizes to an external signal applied to HSYNC. Refer to the MAX8751 IC data sheet for more information. Place a shunt on JU6 to disable the HSYNC feature. See Table 2 for jumper settings. Table 1. Phase Shift PIN SETTINGS PHASE SHIFT IN DEGREES JU4 (PS1) JU5 (PS2) MASTER SLAVE 1 SLAVE 2 SLAVE 3 SLAVE 4 2-3 (GND)* 2-3 (GND)* 0 180 — — — 1-2 (VCC) 2-3 (GND) 0 120 240 — — 2-3 (GND) 1-2 (VCC) 0 90 180 270 — 1-2 (VCC) 1-2 (VCC) 0 72 144 216 288 *Default position. Table 2. Jumper Selection JUMPER JU1 JU2 JU3 SHUNT LOCATION 1-2 2-3* Not installed* Installed FUNCTION An external sync signal controls the brightness. An analog voltage on the CNTL pin controls the brightness. Configures the MAX8751 for master operation. Configures the MAX8751 for slave operation. 1-2* Enables the MAX8751. 2-3 Disables the MAX8751. Not installed Drive pad SHDN with an external logic signal. JU4 — Phase-shift select input 1 (PS1). See the phase shift table (Table 1). JU5 — Phase-shift select input 2 (PS2). See the phase shift table (Table 1). JU6 JU7 Not installed Installed* Not installed Installed* The switching frequency synchronizes to an external signal applied to HSYNC. Disables the HSYNC feature. The DPWM frequency synchronizes to an external signal applied to LSYNC. Disables the LSYNC feature. *Default position. _______________________________________________________________________________________ 3 Evaluates: MAX8751 Procedure 1) Connect the lamps to connectors CN1–CN4. 2) Connect the +8V to +24V supply to the pads labeled VIN and GND on the MAX8751 EV kit. 3) Turn on the power supply. Evaluates: MAX8751 MAX8751 Evaluation Kit LSYNC Daisy-Chain Configuration DPWM sync input. The DPWM frequency synchronizes to an external signal applied to LSYNC. Refer to the MAX8751 IC data sheet for more information. Place a shunt on JU7 to disable the LSYNC feature. See Table 2 for jumper settings. Up to five MAX8751 EV kits can be daisy-chained together. Connect J1 of slave 1 to J2 of the master. See Tables 3 and 4 for daisy-chain connection and jumper configuration. Table 3. Daisy-Chain Connection LOCATION IN DAISY CHAIN Master Slave 1 Slave 2 Slave 3 Slave 4 4 CONNECTOR J1 Table 4. Master/Slave Jumper Configuration MASTER CONNECTION Not connected. SHUNT LOCATION JUMPER SLAVE SHUNT LOCATION JUMPER J2 Connect to J1 of slave 1. JU1 User defined JU1 2-3 J1 Connect to J2 of master. JU2 Not installed JU2 Installed JU3 2-3 JU3 Not installed J2 Connect to J1 of slave 2. J1 Connect to J2 of slave 1. J2 Connect to J1 of slave 3. J1 Connect to J2 of slave 2. J2 Connect to J1 of slave 4. J1 J2 JU4 See Table 1 JU4 Same setting as master JU5 See Table 1 JU5 Same setting as master Connect to J2 of slave 3. JU6 User defined JU6 Installed Not connected. JU7 User defined JU7 Installed _______________________________________________________________________________________ MAX8751 Evaluation Kit Evaluates: MAX8751 VIN F1 3A VIN 8V TO 24V 20 C2 0.1µF 27 VCC VCC 21 VCC C3 1µF VCC CNTL 1 SHDN VCC 2 R9 100kΩ 4 IN SEL 11 1 2 JU1 3 GND 17 VCC BST2 SHDN BST1 JU3 3 C1 22µF VCC R1 10Ω GND BST2 24 SHDN JU2 3 1 R10 100kΩ 3 C19 0.01µF TP1 2 BST1 CNTL GH1 7 DPWM 23 6 LFCK R17 1MΩ LX1 LFCK GL1 9 4 PGND1 U1 TP4 22 25 R5 SHORT (PC TRACE) 7 8 PSCK PGND2 GL2 4 2 26 R2 100kΩ 1% 3 14 31 16 PS1 LX2 PS2 19 GH2 C11 12pF 3kV 18 HV1 VFB VFB LF 12 TFLT 2 10 HSYNC 5 JU7 1 2 3 L 1 HSYNC LSYNC R12 100kΩ C9 1000pF R13 100kΩ C10 1000pF D1 PCOMP TFLT R R15 20kΩ LF JU6 LSYNC R14 100kΩ HF C5 0.22µF AGND C7 0.1µF JU5 28 AGND 4 2 R7 SHORT (PC TRACE) 13 C4 0.1µF LX2 5 6 R6 SHORT (PC TRACE) HF R3 150kΩ 1% 7 8 N4 1 3 15 JU4 1 2 LX1 BST2 1 2 6 5 N2 1 3 MAX8751 8 3 4 2 C6 0.1µF VCC VCC 1 3 1 3 2 5 6 HFCK R16 1MΩ PSCK 7 8 N3 6 5 N1 DPWM TP3 HFCK 7 8 BST TP2 R11 1kΩ R4 SHORT (PC TRACE) C12 12pF 3kV HV2 ISEC 32 30 ISEC COMP R8 15Ω JU12 IFB IFB D2 29 C13 OPEN R34 1MΩ SHDN C8 0.01µF C18 0.1µF Figure 1. MAX8751 EV Kit Schematic _______________________________________________________________________________________ 5 6 VFB EN D11 SHDN J1-5 SHDN J2-5 Figure 1. MAX8751 EV Kit Schematic—High-Voltage Section _______________________________________________________________________________________ BHeslington J2-9 J2-7 LFCK J2-3 J2-1 J1-9 HFCK LFCK J1-3 J1-7 HFCK R20 470kΩ J1-1 R21 470kΩ VIN PSCK N.C. J2-10 J2-8 J2-6 J2-4 J2-2 J1-10 J1-8 J1-6 J1-4 VIN Q1 R40 3.0kΩ HF IFB M1 2N7002 3 2 J1-2 N.C. 2 3 1 LF DPWM J2 J1 C20 4.7µF 1 R19 10kΩ R18 10kΩ VCC R39 27kΩ TFLT D6 D5 D4 D3 R33 3.0kΩ R32 3.0kΩ R31 3.0kΩ R30 3.0kΩ LX1 T5P4 3 2 T4P2 1 4 T5 4 3 3 1 T3 LX2 LX2 2 2 C24 2.2µF C23 2.2µF 4 T4 1 EN R25 510kΩ T5P4 EN R24 510kΩ EN R23 510kΩ T4P2 EN R22 510kΩ ISEC 4 T2 7 4 T1 7 D10 R38 510kΩ D9 R37 510kΩ D8 R36 510kΩ D7 R35 510kΩ 10 9 10 9 R29 10kΩ R28 10kΩ R27 10kΩ R26 10kΩ HV2 HV1 JU9 JU8 JU11 HV2 JU10 HV2 HV1 HV1 C17 100pF 3kV C16 100pF 3kV C15 100pF 3kV C14 100pF 3kV CN1 LV HV LV LV 2 LV CN4 1 HV 2 CN3 1 HV 2 CN2 1 HV 2 1 Evaluates: MAX8751 MAX8751 Evaluation Kit MAX8751 Evaluation Kit Evaluates: MAX8751 Figure 2. MAX8751 EV Kit Component Placement Guide— Component Side Figure 3. MAX8751 EV Kit PC Board Layout— Component Side _______________________________________________________________________________________ Heslington 7 Evaluates: MAX8751 MAX8751 Evaluation Kit Figure 4. MAX8751 EV Kit PC Board Layout—Layer 2 8 Figure 5. MAX8751 EV Kit PC Board Layout—Layer 3 _______________________________________________________________________________________ MAX8751 Evaluation Kit Evaluates: MAX8751 Figure 6. MAX8751 EV Kit PC Board Layout—Solder Side Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 9 © 2006 Maxim Integrated Products Heslington Printed USA is a registered trademark of Maxim Integrated Products, Inc.