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| 19-1987; Rev 0; 3/01 MAX1802 Evaluation Kit for Digital Still Cameras General Description The MAX1802 evaluation kit (EV kit) accepts +3.3V to +11V battery voltages and provides all of the output voltages required in digital still cameras (DSC). This EV kit consists of the MAX1802 multi-output master converter and the MAX1801 slave step-up converter. The MAX1802 EV kit provides 10 separate output voltages. The MAX1802 provides one main system stepdown converter (+3.3V/1A), one DSP core step-down (+1.8V/400mA), one step-up converter for the backlight (+7V/100mA), three flyback outputs for the CCD, and three flyback outputs for the LCD. In addition, the MAX1801 provides one general-purpose step-up converter (+12V/100mA). The MAX1802 EV kit's outputs are adjustable and are suitable for applications running from 4-cell alkaline, NiCd, or NiMH batteries, or from lithium ion (Li+) batteries (1 or 2 cell). Features o 10 Outputs 2 Synchronous Rectified Step-Down Converters 2 Step-Up Converters 6 Flyback Outputs o +3.3V to +11V Input Voltage Range o All Converters Synchronized to Single Oscillator o 100kHz to 1MHz Switching Frequency (set to 400kHz) o Independent Shutdown of Each Converter o Short-Circuit Protected Flyback Outputs o Soft-Start on Each Output o Fully Assembled and Tested Evaluates: MAX1802 Component Suppliers SUPPLIER AVX Central Semiconductor Fairchild Semiconductor Motorola Sumida Taiyo Yuden TDK PHONE 803-946-0690 631-435-1110 408-721-2181 602-303-5454 847-956-0666 408-573-4150 847-803-6100 FAX 803-626-3123 631-435-1824 408-721-1635 602-994-6430 847-956-0702 408-573-4159 847-803-6296 PART MAX1802EVKIT Ordering Information TEMP. RANGE 0C to +70C IC PACKAGE 32 TQFP Note: Please indicate that you are using the MAX1802 when contacting these component suppliers. Component List DESIGNATION C1 C2, C5, C6, C25 C3, C24 C4, C7, C8, C9 C10 C11 C12 C13, C17 C14 QTY 1 4 2 4 1 1 1 2 1 DESCRIPTION 100pF ceramic capacitor (0603) 0.1F ceramic capacitors (0603) 10F, 16V ceramic capacitors (1812) TDK C4532X7R1C106M 1000pF ceramic capacitors (0603) 4.7nF ceramic capacitor (0603) 470pF ceramic capacitor (0603) 4.7F, 16V ceramic capacitor (1206) TDK C3216X5R1C475M 1F, 10V ceramic capacitors (0805) TDK C2012X5R1A105M 10F, 10V ceramic capacitor (1206) TDK C3216X5R1A106M C18-C23 C26 6 1 C16 1 DESIGNATION C15 QTY 1 DESCRIPTION 100F, 10V tantalum capacitor (D case) AVX TPSD107M010R0100 22F, 16V ceramic capacitor (1812) TDK C4532X5R1C226M 1F, 25V ceramic capacitors (1206) TDK C3216X7R1E105M 10F, 16V ceramic capacitor (1210) TDK C3225X5R1C106M P-N junction diodes (SOT323) Central Semiconductor CMSD-4448 Schottky diodes (SOT323) Central Semiconductor CMSSH-3 D1, D4, D6 3 D2, D3, D5 3 ________________________________________________________________ Maxim Integrated Products 1 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. MAX1802 Evaluation Kit for Digital Still Cameras Evaluates: MAX1802 Component List (continued) DESIGNATION D7, D8 D9 JU1-JU6 JU7-JU12 L1 L2, L4 L3 Q1, Q2, Q3, Q5 Q4 Q6 R1 R2 R3, R19, R20, R22, R24, R28 R4, R13, R14, R15 R5, R6, R26, R27, R30, R31 R7 R8-R12 R16 R17 R18 R21 R23 R25, R29 R32, R33, R37, R38, R41, R42 R34, R35, R39, R40 R36 QTY 2 1 6 6 1 2 1 4 1 1 1 1 6 4 6 1 5 1 1 1 1 1 2 6 4 1 DESCRIPTION Schottky diodes (SOD123) Motorola MBR0520L or Fairchild Semiconductor MBR0520L Schottky diode (S-FLAT) Toshiba CRS05 (not installed) 3-pin headers 2-pin headers 4.7H inductor Sumida CR43-4R7 10H inductors Sumida CDRH6D28-100 3.3H inductor Sumida CR43-3R3 N-channel MOSFETs (SuperSOT-3) Fairchild Semiconductor FDN337N P-channel MOSFET (SO-8) Vishay/Siliconix SI9803DY N-channel MOSFET (SuperSOT-3) Fairchild Semiconductor FDN359AN 40.2k 1% resistor (0603) 866k 1% resistor (0603) 100k 1% resistors (0603) 10k 5% resistors (0402) Open (0402), not installed Short (0603), not installed, shorted in the PC board layout Open (0603), not installed 33k 5% resistor (0603) 91k 5% resistor (0603) 464k 1% resistor (0603) 44.2k 1% resistor (0603) 165k 1% resistor (0603) 301k 1% resistors (0603) 3k 5% resistors (1206) 200 5% resistors (1206) 750 5% resistor (1206) DESIGNATION T1 QTY 1 DESCRIPTION Sumida transformer CLQ72-type package Sample number: 6333-T334 Sumida transformer CLQ72-type package Sample number: 6333-T333 MAX1802EHJ (32-pin TQFP) MAX1801EKA (8-pin SOT23) Shunts T2 U1 U2 None 1 1 1 12 Recommended Equipment * * +3.3V to +11V battery or power supply Digital voltmeter (DVM) Quick Start 1) Make sure jumpers JU1-JU6 are connected in the ON position. This ensures all converters will turn on at power-up. 2) Before loading any output, check the output voltage and output current capability shown in Table 1. 3) Make sure jumpers JU7-JU12 are connected if no external loads are attached to the OUT1A, OUT1B, OUT1C, OUT2A, OUT2B, and OUT2C outputs. 4) Attach a +3.3V to +7V battery or power supply to IN. 5) Using the DVM, measure the voltage at MAIN, CORE, OUT1_, OUT2_, OUT3, and OUT4. Detailed Description MAIN Output The main output (MAIN) powers the core supply of the MAX1802. MAIN must be regulated before any of the other outputs function. To enable MAIN, place jumper JU4 to the ON position. Apply +3.3V to +11V between IN and GND. The voltage between MAIN and GND should be approximately +3.3V. If IN is less than +3.3V, MAIN will not be regulated. CORE Output The core output (CORE) is powered from MAIN and regulated at +1.8V using a synchronous-rectified step-down converter. Drawing more than 200mA out of CORE reduces the current capability at MAIN. To enable CORE, place jumper JU5 to the ON position. 2 _______________________________________________________________________________________ MAX1802 Evaluation Kit for Digital Still Cameras Table 1. Output Voltage and Current Capability LABEL MAIN CORE OUT1A OUT1B OUT1C OUT2A OUT2B OUT2C OUT3 OUT4 VOLTAGE/CURRENT +3.3V at 1A +1.8V at 400mA +13.5V at 10mA +5V at 50mA -9V at 10mA +13.5V at 10mA +5V at 50mA -19.0V at 10mA +7V at 100mA +12V at 100mA To enable OUT2_, place jumper JU2 to the ON position. To disable OUT2_, place jumper JU2 to the OFF position. To enable and disable the output voltages using an external signal, see the Logic Control of the Output Voltages section. If a different set of output voltages is required, see the Setting the Flyback Circuit Voltages section. Evaluates: MAX1802 OUT3 The voltage at OUT3 is typical of that required by a CCFL backlight inverter. To enable OUT3, place jumper JU3 to the ON position. Place the external load between OUT3 and GND. To change the output voltage of OUT3, see the Setting the Step-Up Output Voltage section. OUT3 is configured for a 7V output. For input voltages greater than 7V, the output will approximately track the input. OUT3 can be configured to drive a white LED backlight instead of a CCFL backlight. OUT1_ (Flyback Outputs) The voltages at OUT1_ are typical of CCD bias voltages. The output voltages are +13.5V/10mA, +5V/50mA, and -9V/10mA. These voltages are generated through a custom flyback transformer. OUT1B (+5V) is used to regulate the flyback circuit. The other output voltages (+13.5V and -9V) are controlled by the turns-ratio of the flyback transformer. If the +13.5V and -9V outputs are not loaded at the fixed 10mA load, then the output voltage will change from the nominal loaded output voltage. Loads are included on the MAX1802 EV kit by shorting jumpers JU7 through JU12. If external loads are used, remove these jumpers to disable the built-in loads. To enable OUT1_, place jumper JU6 to the ON position. To disable OUT1_, place jumper JU6 to the OFF position. To enable and disable the output voltages using an external signal, see the Logic Control of the Output Voltages section. If a different set of output voltages is required, see the Setting the Flyback Circuit Voltages section. OUT4 The voltage at OUT4 is a general-purpose +12V output that can supply up to 100mA. To enable OUT4, place jumper JU1 to the ON position. Place the external load between OUT4 and GND. To change the output voltage of OUT4, see Setting the Step-Up Output Voltage section. Customizing the MAX1802 EV Kit Setting the Main Output Voltage MAIN is set by a voltage-divider, which drops the output voltage to the +1.25V feedback threshold voltage. To change the 3.3V setting of MAIN, change the resistor-divider ratio by changing R23. Use: R23 = 80k/V x (VOUT - 1.248V) The MAIN output voltage may be set to any voltage between +2.7V and +5.5V. For additional information, refer to the MAX1802 IC data sheet. OUT2_ (Flyback Outputs) The voltages at OUT2_ are typical of LCD bias voltages. The output voltages are +13.5V/10mA, +5V/50mA, and -19V/10mA. These voltages are generated through a custom flyback transformer. OUT2B (+5V) is used to regulate the flyback circuit. The other output voltages (+13.5V and -19V) are controlled by the turns-ratio of the flyback transformer. If the +13.5V and -19V outputs are not loaded at the fixed 10mA load, then the output voltage will change from the nominal loaded output voltage. Loads are included on the MAX1802 EV kit by shorting jumpers JU7 through JU12. If external loads are used, disable the built-in loads by removing these jumpers. Setting the Core Output Voltage CORE is set by a voltage-divider, which drops the output voltage to the +1.25V feedback threshold voltage. To change the +1.8V setting of CORE, change the resistor-divider ratio by changing R21. Use: R21 = 80k/V x (VCORE - 1.248V) CORE may be set to any voltage between +1.25V and +5.5V but must remain less than the voltage at MAIN. The MAX1802 EV kit is configured so that MAIN powers the CORE input. _______________________________________________________________________________________ 3 MAX1802 Evaluation Kit for Digital Still Cameras Evaluates: MAX1802 Setting the Flyback Circuit Voltages (OUT1_ and OUT2_) A flyback circuit generates OUT1_ and OUT2_. This allows multiple positive or negative voltages to be generated by a single converter and allows the voltages to drop to 0 when the converter is disabled. The transformer must be designed for a given set of output voltages. On the flyback circuits, only a single output voltage is directly regulated by the MAX1802. All other voltages are controlled by the transformer's turns-ratio. If another set of output voltages is required, a transformer with a different secondary turns-ratio must be used. Consult the transformer manufacturer for details. Typically, the highest power, positive voltage output of the flyback transformer is fed back to the controller. To change the regulated output voltage, use a different resistor in the voltage-divider. Table 2 lists the resistors used for each output. Leave the resistors off (open) for unregulated outputs. For a given output voltage, if the bottom resistor is 100k, then the top resistor value is: R__ = 80k/V x (VOUT - 1.248V) Setting the Switching Frequency All of the switching regulators are synchronized to a single oscillator frequency. The oscillator capacitor (C1) is charged through R1 and discharged internally by the MAX1802. The MAX1802 EV kit operates at 400kHz, with MAIN set to 3.3V. Change resistor R1 or capacitor C1 if a different MAIN voltage is used or another frequency is desired. Refer to the MAX1802 IC data sheet for the correct values to use for R1 and C1. Logic Control of the Output Voltages Each controller may be independently turned off or on using jumpers (JU1-JU6) or with logic voltages. To control an output using an external logic signal, remove the ON and OFF jumper for that output and place the control signal on the corresponding ON_ pad. To enable MAIN, drive the ON pad greater than +1.8V. To enable CORE or OUT1, drive the corresponding ON_ pad greater than +1.6V. To enable OUT2, OUT3, or OUT4 with the default maximum duty cycle, drive the corresponding ON_ pad to greater than or equal to the reference voltage. If a resistor-divider is used for duty cycle adjustment (R5, R6, R9, R10, R11, and R12), use an open-drain driver on the corresponding ON_ pad. See the Setting the Maximum Duty Cycle section for additional information. To disable each output individually, drive the voltage at the corresponding ON_ pad less than +0.3V. Note that the voltages at OUT3 and OUT4 will drop slightly below the battery voltage when off, due to the DC current path through the inductor and output rectifier. For the step-up outputs, a switch may be added between the output voltage and the load to disconnect them while the output is disabled. Setting the Step-Up Output Voltage (OUT3 and OUT4) The output voltage of the step-up circuit voltages (OUT3 and OUT4) may be set to any voltage above +1.25V. Note that if the battery voltage is greater than the step-up regulation voltage, the output voltage will rise above the regulation voltage. To set the output voltage, choose the voltage-divider resistors. For OUT3, choose: R18 = 80k/V x (VOUT3 - 1.248V) For OUT4, choose: R2 = 80k/V x (VOUT3 - 1.248V) Setting the Maximum Duty Cycle DCON1, DCON2, and DCON3 set the maximum duty cycle for controllers 1, 2, and 3, respectively. A resistordivider from REF to DCON_ sets the corresponding maximum duty cycle up to 90%. The MAX1802 EV kit has DCON_ shorted to REF, producing a default duty cycle of 76%. Refer to the MAX1802 IC data sheet for additional information. Table 2. Flyback Converter Feedback Resistors OUTPUT OUT_A OUT_B OUT_C OUT1_ R30 R29 R31 OUT2_ R26 R25 R27 4 _______________________________________________________________________________________ +2.7V TO +7.0V R32 3k JU7 C23 1.0F OUT1A OUT1B JU8 OUT1C R36 750 R34 200 R28 100k 1% OUT2A 1 1 JU11 OUT2C R41 3k R42 3k 24 VL FB2 13 ON1 VDDC 27 COMP1 COMP2 13 2 COMP3 DHM COMPM COMPC DLM PGNDM 20 DL3 LXC 8 9 26 L4 10H C14 10F FBC 22 FB3 GND PGND VL 32 25 30 28 C13 1.0F LXM 7 2 6 4 56 Q4 78 L2 10H 1 Q6 3 1 D9 2 MAIN C16 22F C17 1.0F R23 165k 1% FBM 1 ON1 R13 10k 14 R14 10k 17 R15 10k 21 R16 33k 2 R17 91k 29 IN C26 10F C11 470pF OUT3 1 1 Q1 2 3 C12 4.7F R18 464k 1% R19 100k 1% 2 GND D7 L1 4.7H C10 4.7nF C9 1000pF C8 1000pF C7 1000pF 1 2 3 JU6 ONC 16 R24 100k 1% R39 200 R40 200 D5 3 D4 1 C20 1.0F JU10 OUT2B R37 3k R38 3k R35 200 R29 301k 1% R30 OPEN GND R33 3k IN IN GND OUT4 VL IN 1 C24 10F 10 VDDM 5 3 1 R31 OPEN JU9 D3 4 VH 12 DL1 5 4 C1 100pF R11 OPEN R9 OPEN R7 SHORT 11 DCON1 DCON2 DCON3 FB1 T2 XF MR-CLQ72 IN 8 1 7 6 5 3 R27 OPEN JU12 D6 1 15 18 23 R8 OPEN R10 OPEN R12 OPEN C6 0.1F C5 0.1F OSC 31 REF C25 O.1F 1 2 Q2 3 6 C22 1.0F C21 1.0F 7 1 3 D2 T1 XF MR-CLQ72 8 1 1 D1 3 D8 L3 3.3H 2 C3 10F 2 8 R2 866k 1% 1 Q5 3 DL U2 REF OSC IN C2 0.1F 7 R1 40.2k 1% Figure 1. MAX1802 EV Kit Schematic REF 3 GND 2 R6 OPEN 6 R3 100k 1% FB MAX1801 OSC 1 R4 10k 5 C4 1000pF COMP VL 4 DCON ON4 JU1 1 2 3 R5 OPEN U1 MAX1802 4 DL2 3 3 ONM 19 2 1 Q3 ON2 VL ON3 IN ONM VL ONC 1 2 3 JU5 1 2 3 JU4 1 2 3 JU3 C19 1.0F C18 1.0F VL 1 2 3 JU2 R26 OPEN R25 301k 1% R22 100k 1% C15 100F 10V CORE R21 44.2k 1% R20 100k 1% Evaluates: MAX1802 _______________________________________________________________________________________ GND MAX1802 Evaluation Kit for Digital Still Cameras 5 MAX1802 Evaluation Kit for Digital Still Cameras Evaluates: MAX1802 ACTUAL BOARD DIMENSIONS: 3in. X 4in. Figure 2. MAX1802 EV Kit Component Placement Guide--Top Silkscreen ACTUAL BOARD DIMENSIONS: 3in. X 4in. Figure 3. MAX1802 EV Kit PC Board Layout--Component Side ACTUAL BOARD DIMENSIONS: 3in. X 4in. Figure 4. MAX1802 EV Kit PC Board Layout--GND Layer 2 ACTUAL BOARD DIMENSIONS: 3in. X 4in. Figure 5. MAX1802 EV Kit PC Board Layout--VCC Layer 3 6 _______________________________________________________________________________________ MAX1802 Evaluation Kit for Digital Still Cameras Evaluates: MAX1802 ACTUAL BOARD DIMENSIONS: 3in. X 4in. Figure 6. MAX1802 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. 7 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2001 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products. |
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