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| SM8144B NIPPON PRECISION CIRCUITS INC. EL Sheet Driver OVERVIEW The SM8144B is a transformer-less electroluminescent (EL) driver IC, capable of driving displays up to 80 cm2 in size. It is a high-efficiency driver that features revised coil switching transistor ON resistance and output circuit configuration to reduce loss, all in a compact package. A microcontroller interface pin (ENA) is provided, which can be used to control the EL driver ON/OFF function. The device is available in 8-pin VSOP packages. FEATURES s s PINOUT (Top view) pre lim ina s s s s s s Dedicated EL driver 1.6 to 5.5 V supply voltage 100mA maximum operating current (VDD = 3.0V, Ta 70C) 3.5 typical output resistance 200 Vp-p maximum EL driver voltage* 31 to 1500 Hz EL drive frequency range* High voltage CMOS Process 8-pin VSOP plastic package CHV LDR OSC *: Adjustable with external resistance. APPLICATIONS s s s Hand held PC, Palm size PC Mobile IT equipment White EL PACKAGE DIMENSIONS (Unit : mm) ORDERING INFORMATION D e vice P ackag e SM8144BV 8-pin V S O P 4.4 0.2 6.4 0.3 0.575 typ 3.1 0.3 0.15 -0.05 +0.1 0.10 0.22 0.1 0.1 0.05 0.65 1.15 0.05 0.12 M NIPPON PRECISION CIRCUITS--1 0.5 0.2 ry 1 2 3 4 8 7 6 5 OUT1 OUT2 VDD ENA VSS 8144BV 0 to 10 SM8144B BLOCK DIAGRAM EL sheet < 80cm2 VDD Boosting Block VSS PIN DESCRIPTION Pin nu m b e r 1 2 3 4 Name CHV LDR VSS lim I/O I High-voltage DC input O - I Booster coil driver output Ground I - Supply O O Output 2 Output 1 When ENA is logical "H", SM8144B is active. pre OSC ENA 5 6 7 8 VDD OUT2 OUT1 Coil and EL driver oscillator (oscillator frequency determined by external resistor) E n a ble input (built-in pull-down resistor) ina ry LDR CHV OUT1 OUT2 Switching Circuit Dividing Circuit 1/4 Dividing Circuit 1/1024 Oscillator for Boosting and EL driving OSC ENA Oscillation Block ROSC ENA from microcontroller Function NIPPON PRECISION CIRCUITS--2 SM8144B SPECIFICATIONS Absolute Maximum Ratings P arameter Supply voltage range Input voltage range Symbol VDD V IN VCHV Output voltage VLDR VOUT1/2 Pow er dissipation Storage temperature range PD TSTG All Input pins CHV pin LDR pin Condition Rating - 0.3 to 7.0 V S S - 0.3 to V D D + 0.3 0.5 to 120 Unit V V V V V OUT1, OUT2 pin T a 70 C T a 85 C Recommended Operating Conditions P arameter Supply voltage range Operating temperature Symbol VDD2 TO P R ina ry 0.5 to 120 0.5 to 120 140 100 - 55 to 125 Rating typ 3.0 - Condition min 1.6 max 5.5 85 - 40 - - - - - - - - - 0.47 100 60 70 42 - mW mW C Unit V C Including coil current, V D D = 3.0V, T a 70 C Operating current 1 mA lim ID D 2 LLDR fL D R = 64 kHz Including coil current, V D D = 5.0V, T a 70 C Including coil current, V D D = 3.0V, T a 85 C Including coil current, V D D = 5.0V, T a 85 C mA mA mA Coil inductance mH 1. Max value is as same as Absolute Maximum Ratings. pre NIPPON PRECISION CIRCUITS--3 SM8144B DC Characteristics VDD = 3.0 V, Ta = 25 C unless otherwise noted. Rating P arameter Supply voltage CHV output voltage OUT1, OUT2 HIGH-level output voltage O U T 1 , O U T 2 L OW -level output voltage LDR output resistance OSC oscillator frequency OSC oscillator frequency range OUT1, OUT2 output frequency OUT1, OUT2 output frequency range LDR inductance driver frequency LDR inductance driver frequency range ENA HIGH-level input voltage E N A L OW -level input voltage ENA input current ENA r ise time 1 Symbol VDD VCHV VOUTH VOUTL R LDR fO S C 1 fO S C 2 fO U T 1 fO U T 2 fL D R 1 fL D R 2 VENAH VENAL IE N A H tE N A ID D 1 IS T B Condition min 1.6 0.5 - - typ 3.0 - max 5.5 100 V V V V Unit Operating current Stand-by current 1. lim Excluding coil current E N A = L OW ENA VSS VDD - 0.5 VSS + 0.5 VDD tENA pre NIPPON PRECISION CIRCUITS--4 ina ry - 100 0.5 - IL D R = 50 mA - 3.5 5.25 307 R O S C = 180 k 205 32 256 - 1536 300 R O S C = 180 k 200 31 51 8 250 - 1500 77 R O S C = 180 k 64 - 384 ENA = HIGH, V D D = 1.6 to 5.5V V D D - 0.5 V S S - 0.3 2.0 - - V D D + 0.3 V S S + 0.5 6.0 E N A = L OW , V D D = 1.6 to 5.5V V E N A H = V D D = 3.0V - 4.0 - 100 1.0 1.0 - - - - kHz Hz kHz V A s mA A SM8144B TYPICAL APPLICATIONS s EL sheet size: 20 to 30cm2, Current consumption: 20mA 0.01F 3.0V s EL sheet size: 30 to 50cm2, Current consumption: 40mA 0.1F 100V lim LDR 0.01F 3.0V s EL sheet size: 50 to 100cm2, Current consumption: 80mA pre 0.01F 3.0V 0.1F 100V Note: Do not operate the S M 8 1 4 4 B with the EL sheet NOT connected (no load to OUT1/OUT2) since the IC will be damaged. ina ry CHV OUT1 LDR OUT2 0.1F 100V EL sheet 470H VSS VDD OSC ENA 180k Diode: TOSHIBA 1SS250 Coil: MURATA LQH4N471K04M00 CHV OUT1 EL sheet OUT2 220H VSS VDD OSC ENA 180k Diode: TOSHIBA 1SS250 Coil: MURATA LQH4N221K04M00 CHV OUT1 EL sheet LDR OUT2 220H VSS VDD OSC ENA 360k Diode: TOSHIBA 1SS250 Coil: TOKO D73LC (817CE221M) NIPPON PRECISION CIRCUITS--5 SM8144B NIPPON PRECISION CIRCUITS INC. reserves the right to make changes to the products described in this data sheet in order to improve the design or performance and to supply the best possible products. Nippon Precision Circuits Inc. assumes no responsibility fo r the use of any circuits shown in this data sheet, conveys no license under any patent or other rights, and makes no claim that the circuits are free from patent infringement. Applications for any devices shown in this data sheet are for illustration only and Nippon Precision Circuits Inc. makes no claim or warranty that such applications will be suitable for the use specified without further testing or modification. The products described in this data sheet are not intended to use for the apparatus which influence human lives due to the failure or malfunction of the products. Customers are requested to comply with applicable laws and regulations in effect now and hereinafter, including compliance with expor t controls on the distribution or dissemination of the products. Customers shall not expor t, directly or indirectly, any products without first obtaining required licenses and approvals from appropriate government agencies. NIPPON PRECISION CIRCUITS INC. 4-3, Fukuzumi 2-chome Koto-ku, Tokyo 135-8430, Japan Telephone: 03-3642-6661 Facsimile: 03-3642-6698 NP0006AE 2000.05 pre NIPPON PRECISION CIRCUITS INC. lim NIPPON PRECISION CIRCUITS--6 ina ry |
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