piezoelectric transformers n features piezoelectric inverter system n explanation of part numbers piezoelectric transformers n recommended applications n rating and characteristics (typ.) ] load resistance (at 95 k ? ) ] please contact us for more information. efte2 1r2 m0 1 part no. EFTU21R203 eftu44r0m03 eftu14r0m @@ type bulk multilayer multilayer vibration mode rosen l drive center l / 2 drive rosen l / 2 drive input power (w) 1.2 4 4 transfer efficiency (%) 88 min. 88 min. 88 min. transfer ratio 6.3 33 33 to 60 147.5 55.6 56.5 electronic equipment such as notebook pcs. any applications where space saving, light weight, low power l back light inverter for lcd consumption and safety are essential. l thin and high transfer efficiency of 93% l lower emi radiations due to the unique l high voltage power supply designed for lcd back light inverter for portable n s a f e t y p r e c a u t i o n s ( s e e p a g e 2 3 4 ) free characteristics resonant frequency (khz) rev.02/04
n application example n dimensions in mm (not to scale) piezoelectric transformers eftu44r0m03 EFTU21R203 eftu14r0m 11 lcd back light inverter circuit.
1 2 3 n application notes 1 may cause over heating of the element and/or piezoelectric transformers piezoelectric transformers 2 precautions for assembly 3 voltage in their operations, shall be free from electri- cally conductive dust and combustible dusts. 4 p i e z o e l e c t r i c t r a n s f o r m e r s m a y f a i l i n e i t her short-circuit or open-circuit mode. w h e n s u b j e c t e d t o s e v ere electrical/environmental conditions and/or mechanical stresses beyond the specified ratings, overheating and/or damage may result. failure to follow the "safety precautions" or "application notes" may result in product malfunction. if you have questions regarding the "safety precautions" or application notes, please contact our engineering section or factory. when piezoelectric transformers are operated beyond their specified electrical and enviromental ratings, they may overheat or burn out. f o r safety, it is recommended that you establish a protective circuit for over heating. the as sembled components and materials near the trans former should be of a flame-retardant type material (ul94v-0 orequivalant) and of a high heat resistance. piezoelectric transformers, should be covered with protective cases to prevent accidental contact and electric shock. "warning - high voltage" should be labeled on surface of the protective case. piezoelectric transformers should be free from likelyhood of a flamming burnout or current discharge. c o m b u s t i b l e m a t e r i a l s o r d u s t t o r e d u c e t h e t r a n s f o r m e r s e l e c t r i c a l c h a r a c t e r i s t i c s. transformers are based on measurements at the 1 . 2 ratings and characteristics of piezoelectric s p e c i f i e d f u n d a m e n t a l f r e q u e n c y o f the sinusoidal considerations for circuit designs voltage curve. a driving voltage of higher frequency harmonics damage. 1 . 1 a n y d c v o l t a g e ( o r b i a s v o l t a g e ) s h o u l d n o t a p p l i e d t o t h e p i e z o e l e c t r i c t r a n s f o r m e r . 1.3 the output voltage of the piezoelectric trans- former depends on the connected impedance load. operating with a relatively higher loaded resistance, or with an open circuit may cause abnormal over heating or damage to the element. i n a n y c a s e, the output voltage of the transformer should be limited to the specified maximum output voltage. environmental conditions 3. 1the piezoelectric transformers shall not be oper ated under dew formation conditions. hydrogen sulfide etc. these corrosive substances will corrode the electrodes of the transformers and may cause malfunction. a n d s h o c k , m a y c a u s e b r e a k a g e , c r a c k i n g a n d / o r d a m a g e t o t h e c e r a m i c e l e m e n t . h a n d l e t h e t r a n s f o r m e r s c a r e f u l l y d u r i n g a s s e m b l y . d o n o t u s e p a r t s t h a t h a v e b e e n d r o p p e d . application of dc voltage may deteriorate the such as hydrogen chlolide, sulferdeoxide and 3.3the piezoelectric transformer, generating high long term storage 4.1 the piezoelectric transformers should be stored in should not be operated under corrosive atmospheres their factory sealed packaging. piezoelectric transformers without protective coating 2 . 1 e x c e s s i v e m e c h a n i c a l s t r e s s e s s u c h a s v i b r a t i o n 3.2 handling precautions safety precautions
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