MX881R

IXYS MX881 Xenon Flash Controller & LED Torch Driver Features: General Description • Highly Integrated Solution that includes: Optimized Flyback Boost Converter Controller, IGBT Driver, 100mA LED Torch Driver, and Transformer Drive Transistor • Small Size (3mm x 5mm DFN-16) • High Efficiency • 3.0 to 5.5 Volt Battery Operation • 1.65 to 5.5 Volt Digital Interface Operation • Low Shut Down Current: 0.1µA • SPI and I2C Bus Compatibility • Programmable Average Battery Current: (50mA – 220mA) • Programmable Output Voltage: (300V - 330V) The MX881 offers a highly integrated Xenon Flash controller, providing an ideal solution for small form factor flash and torch lighting applications. The MX881 integrates a user programmable Controller, IGBT Driver, 100mA LED Torch Driver, and Transformer Drive Transistor to significantly reduce component count, solution size, and design complexity. The Boost Control Logic manages the peak primary current and off time to optimize charge time and control average battery current. Applications: • Camera Cell Phones, Digital Still Cameras, and Optical Film Cameras Ordering Information Part No. MX881R MX881RTR Qty 73 2000 Description 3mm X 5mm DFN-16 DFN-16 Tape & Reel The Charge Cycle Control starts the charge cycle on a low to high transition of the CHARGE input. Then detects when the output voltage has reached the desired voltage and stops the Boost Control Logic, while asserting the DONE output signal. The SPI/I2C serial interface adds the flexibility of 6 programmable average battery currents and 4 programmable high voltage output levels for the flash function. Typical Application VHV VCC T1 1:10 min. MX881 CONTROLLER / DRIVER SW + 500V Total Switching Diodes L SEC VCC TRIGGER CAPACITOR Boost Control Logic DVCC 22 uF FLASH TUBE I PEAK DVCC VFB CHARGE DONE Charge Cycle Logic VOUT V BATT IGBTGATE FLASH IGBT DRIVER SPI / I2C X4 SPI / I2C Interface to set V OUT & I AVE IXYS IGBT I SET LED LED_EN Bandgap REF GND MX881 Drawing No. 088109 1 7/30/07 www.claremicronix.com IXYS MX881 Boost Switch: When turned on, current flows in the primary of the flyback transformer. The energy stored in the transformer is transferred to the secondary as high voltage when the boost switch is turned off. IGBT Driver: Switches the VCC supply to the IGBT gate when the FLASH signal is brought high. If FLASH is low, the IGBT gate is driven to ground. LED Driver: When LED_EN is high, the LED pin will sink 100mA to GND. If LED_EN is low, the LED pin is high impedance. Pin Description Pin No. 11 7 Pin Name VCC DVCC 15 CHARGE 6 DONE 12 VFB 14 FLASH 16 ISEL 1 SCEn 4 SCLK 2 SDATA 3 SW 13 LSEC 9 IGBTGATE 5 LED_EN 10 LED Exposed Pad 8 MX881 Drawing No. 088109 Description Supply voltage from battery, (3.0V – 5.5V). Must be connected to VDVCC. Digital supply voltage for I/O logic (1.65V-5.5V) Low level stops the charging cycle and puts the device into power down mode. Charge remains on the high voltage capacitor. A high level starts a charging cycle. Charging continues until either the correct voltage is reached or CHARGE is brought low. Open drain output that transitions high when the capacitor reaches the desired voltage. This output is normally high except when charging so that standby current is minimized. (Pull-up resistor not sourcing current). Feedback voltage input from voltage divider that determines when the output has reached the desired voltage. A high level will cause the IGBT to turn on firing the flash. A low level will turn the IGBT off. FLASH can be brought low to shorten the flash pulse for red-eye reduction. 2 High level enables the I C interface, low level enables SPI interface. Serial port chip enable. A low on this pin enables the SPI interface to receive data. If SCEn is asserted low while in the I2C mode, the serial interface and control register are reset. Clock input for SPI and I2C interface. Data input and output for SPI interface. Data input and acknowledge/data output for 2 2 I C interface. This output is open drain for I C output data. Connection to internal power transistor that drives the negative terminal of the transformer primary coil. Connection to negative terminal of the transformer secondary. This input is grounded internally through a low impedance used to sense the secondary transformer current. IGBT Gate driver output. A high level will cause the 100mA LED current regulator to turn on. VF = VBATT 100mA LED current regulator. Connect the cathode of the torch LED to this pin. VF = VBATT GND Ground Terminal. N/C No Connect. Do not connect to any signal, ground or power source. 2 7/30/07 www.claremicronix.com IXYS MX881 Absolute Maximum Ratings Symbol VCC, DVCC VIN VSW TSTG Parameter DC Supply Voltage DC Input Voltage Voltage On SW pad Storage Temperature Rating 0.3 to 7.0 -0.3 to VCC+0.3 -0.3 to 55 -40 to +150 Unit V V V o C Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings only and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not implied. Exposure to absolute-maximumrated conditions for extended periods may affect device reliability. Recommended Operating Conditions Symbol VCC DVCC VIN VSW TJ Parameter Analog and Digital Supply Voltage Digital I/O Supply Voltage DC Input Voltage Voltage On SW pad Junction Temperature MX881 Drawing No. 088109 Rating 3 to 5.5 1.65 to 5.5 0 to DVCC 0 to 40 -20 to +115 3 Unit V V V V o C 7/30/07 www.claremicronix.com IXYS MX881 DC Characteristics Junction temperature range -20 to +115°C Symbol Parameter Condition Supply Voltage – Analog and AVCC voltage doubler DVCC Supply Voltage – Digital I/O ICC Supply Current (When Charging) @ 25° C ISTANDBY Supply Current (Not Charging) @ 25° C Vsw = 40V ISW_LEAK SW pin Leakage Current Schmitt trigger, positive-going 1.65V < DVCC < 2.4V VT+ threshold (All digital inputs) Schmitt trigger, negative-going 1.65V < DVCC < 2.4V VTthreshold (All digital inputs) 1.65V < DVCC < 2.4V Vhys Hysteresis, Schmitt trigger Schmitt trigger, positive-going 2.4V < DVCC < 3.6V VT+ threshold (All digital inputs) Schmitt trigger, negative-going 2.4V < DVCC < 3.6V VTthreshold (All digital inputs) 2.4V < DVCC < 3.6V Vhys Hysteresis, Schmitt trigger Schmitt trigger, positive-going 3.6 < DVCC