PBL 380 85 July 1999 PBL 380 85 Integrated circuit for transformerless driving of battery powered EL (electroluminicent) lamps Description. Key features. PBL 380 85 is a monolithic integrated circuit for supplying power to an EL (electroluminicent) lamp. This is intended to replace the LCD background illumination system in battery powered handheld equipment with a low power EL- lamp. Especially suitable for mobile phones where current saving is highly important, as background illumination for both LCD and keyboard. Output voltage max. 190V, min. 170V at max. 2mA constant current charge / discharge of the EL- lamp. Application dependent parameters such as charge / discharge current are set by an external resistor. Two control signals are needed one for the switcher and one for the lamp.The output voltage is set under 170V by the duty cycle and the switching frequency of the control signal, over 170V by an amplitude limiter that switches the switcher off. The switching frequency is app. 50 kHz. The light intensity is controlled by the dutycycle of the switcher control signal. The lamp control signal is divided by two by the circuit. The wave form of the output AC-signal is either triangular or trapezoid depending of the capacitance of the EL-lamp, charge / discharge current and frequency of the lamp control signal.The triangular or trapezoid wave form of the EL-lamp driving voltage and the high switching frequency minimizes audible noise from the lamp and also reduces upcoming electrical noise and harmonics. • Minimum number of external components for function: 1 choke, 1 filter-capacitor and 1 resistor. • Easy adaption to various lamp specifications. • Easy dimming function by controlling the duty cycle. • Extensive current saving feature compared with LEDs. • Power down function <<1µA. • Supply voltage down to 3V. • Comes in a 3x3 mm package • Lights up to 20nF lamp capacitance area depending on lamp parameter nF/cm2. +supply 10 9 85 5 PB L 38 0 8 switcher control signal 2 EL-lamp PBL 380 85 1 4 6 3 Pekka 11.11-98 PB L 38 0 85 lamp control signal True size 10 - pin plastic mini SOP package Functional diagram. 1 PBL 380 85 Maximum Ratings Parameter Supply voltage, continuous All inputs (zener protection) Operating temperature range Storage temperature range Symbol V+ Min. 0 TAmb TStg -30 -55 Max. 90 6.5 +85 +150 Unit V V °C °C Electrical Characteristics At TAmb = 25°C V+ = 2.75 V if no otherwise stated. For further conditions see figure. Parameter Battery voltage VBAT quiescent curren Logic supply voltage V+ operating supply current V+ quiescent supply current Logic low level input voltage Logic high level input voltage Logic low level input current DC/DC converter: Booster output voltage, int.limited Switch transistor sat. voltage Switching frequency, set by the SC-signal frequency H - BRIDGE: Output voltage EL1 - EL2 Output unbalance voltage EL1 - EL2 Output sink/source current range lower limit Output sink/source current range upper limit Output current x resistance product ( note1) Output drive frequency, set by the LC-signal frequency Condition Symbol Min. Typ. Max. Unit VBat 1.5 3.6 V+ 2.4 2.75 65* 0.1 5.5 V µA V V+ off SC + LC 50% 50% SC = 0 ; LC = 0 5 0.7xV+ -100 µA 0.3xV+ 100 V V µA 0.6 V V 90 80mA inductor current 50 170 -5 kHz +5 Vpp V 0.1 mA 1.5 ISET* RSET 9.5 mA 10 10.5 250 Note1: This product is the EL1/EL2 output current multiplied by the resistor value connected to ISET. Voltace at the ISET pin is dependent of the V+ voltage asit is a quota of that voltage. * Battery voltage max. 65V requires correctly chosen duty cycle and inductance. 2 V Hz PBL 380 85 GND 1 10 L SC 2 9 C ISET 3 8 EL1 LC 4 7 V+ 5 6 EL2 NC 10 pin plastic mini SOIC package Pin configuration. Pin Descriptions: Refer to pin configuration. SO Name Function SO Name 1 GND Ground connection 6 EL2 EL - lamp connection 2 SC Switch control input 7 NC No connection 3 ISET Control input for lamp driving capability 8 EL1 EL - lamp connection 4 LC Lamp frequency control input 9 C Boost capacitor connection 5 V+ Supply voltage 10 L Inductor connection Function A B C D A SC LC V+ VBat 22nF series resistance (ESR) < 1Ω 470µH <5Ω 10 5 9 8 EL2 SC EL1 2 EL2 EL-lamp 4.7 nF PBL 380 85 1 4 LC Reference picture. 6 EL1 3 Pekka 2.12-98 EL1-EL2 Some circuit curve forms . 3 PBL 380 85 10 - pin mini SOP Dim. millimeters E F tol. A 1.10 max. B 0.23 +0.07 -0.08 C 0.18 ±0.05 D 0.50 BSC E 3.00 ±0.1 F 4.90 ±0.15 G 0.55 ±0.15 H 3.00 ±0.1 K 0.10 ±0.05 α 3.0° ±3.0° H G A α C D B K Information given in this data sheet is believed to be accurate and reliable. However no responsibility is assumed for the consequences of its use nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Ericsson Components AB. These products are sold only according to Ericsson Components AB's general conditions of sale, unless otherwise confirmed in writing. Specifications subject to change without notice. 1522-PBL 380 85/1 Uen Rev.A © Ericsson Components AB July 1999 Ericsson Components AB S-164 81 Kista-Stockholm, Sweden Telephone: (08) 757 50 00 www.ericsson.se/microe 4 Ordering Information Package 10 pin plastic mini SOP Temp. Range -30 to 85°C Part No. PBL 380 85/1MSOT Tape and Reel