TAIYO YUDEN LCD Backlight Driver Model LS520A 12 Volt Input Dual Tube CCFT Inverter Brightness Control Physical Specifications Dimensions: 20mm x 130mm x 13.5mm (0.787" x 5.12" x 0.531") Weight: 36g (1.28 oz.) Operating Temp: 0 to 55°C, convection cooling Relative Humidity: 20% to 90%, non-condensing Storage: -20 to 85°C/5-95% RH Impact Resistance: 50G half wave per 2 msec Vibration Resistance: 10-55-10 Hz/min @ 1.5mm Input Specifications* Item Condition Standard Input Voltage Rated — 12 Vdc Tolerance Continuous Operation 9.6 Vdc - 14.4 Vdc Starting Condition (Discharge Starting Voltage) 9.6 Vdc - 14.4 Vdc Max. Input Current VIN = 9.6 Vdc 1.2 A Luminance @ Max. Rush Current VIN = 14.4 Vdc 5.0 A /20 μS or less zero-p Luminance @ Max. Max. Input Power VIN = 9.6 Vdc 11.6 W Luminance @ Max. On/Off On/Off ILOW = -0.45 mA or more Input Current L = 0.0 - 0.4 Vdc (Lamp Lighting) VIN = 14.4 Vdc On/Off — H = Open or VIN (Lamp Off) *Above Specifications Occur @ 25 ± 5ºC Output Specifications* Item Condition Standard MIN TYP MAX Output Voltage (Vrms) VIN = 9.6 Vdc 1500 — — Luminance @ Max.(Vcont = 0.0 V) 6.3 7.0 7.7 Tube Current (mArms) Luminance @ Min. (Vcont = 2.5 V) 2.5 3.0 3.5 Max. Power Output (W) VIN = 12 Vdc/Luminance @ Max. — — 3.9 Ignition Frequency (kHz) Luminance @ Max. 50 60 70 *Above specifications occur @ 25 ± 5ºC & VIN = 9.6 - 15 Vdc. Model LS520A Insulating Withstand Voltage Item Rating Description Insulating Withstand Voltage Primary - Secondary 2.0 kVA Impulse Insulating Resistance Primary - Secondary 500 Vdc Winding - Core More than 100 MΩ * Apply voltage to pin 6. Luminance Variance Item Condition Applied Voltage Output Current Luminance @ Max. Btwn. pin 6 & 7 Vcont = 0.0 V 7.5 mA Luminance @ Min. Btwn. pin 6 & 7 Vcont = 2.5 V 3.5 mA 130 (5.120) 18.2 18.2 (0.717) (0.717) 93.6–0.3(3.685–0.012) 1 3 INPUT CN2 CN1 CN3 2–ş3(0.118) – – © Copyright 2001 Taiyo Yuden (U.S.A.), Inc. Specifications subject to change without notice. world leaders in materials and electronics technology Taiyo Yuden (U.S.A.), Inc. 1770 La Costa Meadows Drive, San Marcos, CA 92069 (760) 510-3200 / Fax: (760) 471-4021 FM 32227 (800) 493-6835 www.t-yuden.com powerproducts@t-yuden.com 20.0 1.0TYP (0.039TYP) (0.787) 2.5MAX (0.098MAX) 10.0MAX 5.0 5.0 (0.394MAX) (0.197) (0.197) 13.5MAX 10.0 0.3 (0.531MAX) (0.394 0.012) INVERTER Model LS520A Tech Notes Connection Diagram LS460/LS520 Output Connector CN2, CN3 JST SM02(8.0)B-BHS-1 Input Connector CN1 Molex 53261-0790 CN2 DC High-1 1 1 V(in) CFL 1 2 V(in) NC 2 3 3 GND Low-1 SW 4 GND CN3 5 On/Off High-2 1 6 Brightness NC 2 CFL 2 7 SG Low-2 3 DC 0–2.5V Output Current Optimization Method Maximum output current can be adjusted by applying bias voltage between brightness control pins as shown below. Input (C1) 1 V(in) DC Typical Maximum Bias Output Current Output Current 2 V(in) 0.00 V 6.8 mA 7.7 mA 0.75 V 6.5 mA 7.0 mA 3 Gnd Brightness 1.00 V 6.0 mA 6.5 mA Control DC Bias 1.25 V 5.5 mA 6.0 mA (Vdc) 4 Gnd 1.50 V 5.0 mA 5.5 mA 1.75 V 4.5 mA 5.0 mA 5 On/Off 2.00 V 4.0 mA 4.5 mA 2.25 V 3.5 mA 4.0 mA 6 Brightness 2.50 V 3.0 mA 3.5 mA 3.00 V 2.5 mA 3.0 mA 7 SG On/Off Control The on/off control is achieved by using the on/off pin on the One recommended use of logic switch for remote on/off is input side of LS520. The circuit for the remote on/off circuitry shown in the diagram below. Electrical specification for on/off consists of an active low TTL switch. When the circuit is open, terminal is Low 0 to 0.4V, -0.4 mA or higher when switch is the IC Vcc closed. is cut off. When the circuit is closed, IC Vcc is activated. A mechanical switch or a TTL/CMOS gate needs to be placed between the remote on/off pin and ground creating a condition where the circuit is closed to activate the inverter. Either one of the following will be required for the inverter to operate: V(in) V(in) On/Off Pin On/Off Pin 0V Inverter Off 5V Inverter On SW (External) To IC Vcc To IC Vcc 1. Tie on/off pin to ground. 2. Add mechanical switch between on/off pin and ground, close switch. 3. Add TTL/CMOS switch between on/off and ground. Circuit must be closed for unit to operate (as shown above right). Model LS520A Tech Notes Brightness Control Using a Potentiometer The LS520 brightness control is done by applying a DC bias of However, by using a voltage separator circuit consisting of a 0 to 2.5V to the brightness control pins. Unlike the single tube potentiometer, a virtual brightness control by potentiometer inverters like the LS380s, brightness control for dual tube can be achieved. inverters cannot be accomplished with a potentiometer. The reason for this is that the LS520 has a voltage follower, or a sub-regulator built into the unit to synchronize both outputs. 5V DC Bias This voltage follower compensates for resistive load to the brightness control circuitry. Voltage Follower VR BR Control Pin Create 0 to 2.5 V To Regulating IC DC Bias (0 to 2.5 V) Note that current which will run between the brightness control pin will be in a trivial 3.0μA range. Mean Time Between Failures (MTBF) By using the MIL-HDBK 217E Condition Ground Benign method, the MTBF for the LS520 is calculated at 458,000 hours. © Copyright 2001 Taiyo Yuden (U.S.A.), Inc. Specifications subject to change without notice. world leaders in materials and electronics technology Taiyo Yuden (U.S.A.), Inc. 1770 La Costa Meadows Drive, San Marcos, CA 92069 (760) 510-3200 / Fax: (760) 471-4021 FM 32227 (800) 493-6835 www.t-yuden.com powerproducts@t-yuden.com