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SP7653TR Datasheet(PDF) 4 Page - Sipex Corporation |
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SP7653TR Datasheet(HTML) 4 Page - Sipex Corporation |
4 / 12 page 4 Date: 03/25/05 SP7653 Wide Input Voltage Range, 1.3MHz, Buck Regulator © Copyright 2005 Sipex Corporation General Overview The SP7653 is a fixed frequency, voltage mode, synchronous PWM regulator optimized for high efficiency. The part has been designed to be especially attractive for high input voltages of 2.5V to 20V. The heart of the SP7653 is a wide bandwidth transconductance amplifier designed to accom- modate Type II and Type III compensation schemes. A precision 0.8V reference, present on the positive terminal of the error amplifier per- mits the programming of the output voltage down to 0.8V via the VFB pin. The output of the error amplifier, COMP, compared to a 1.1V peak-to-peak ramp is responsible for trailing edge PWM control. This voltage ramp, and PWM control logic are governed by the internal oscillator that accurately sets the PWM fre- quency to 1.3MHz. THEORY OF OPERATION The SP7653 contains two unique control fea- tures that are very powerful in distributed appli- cations. First, asynchronous driver control is enabled during start up, to prohibit the low side switch from pulling down the output until the high side switch has attempted to turn on. Sec- ond, a 100% duty cycle timeout ensures that the low side switch is periodically enhanced during extended periods at 100% duty cycle. This guar- antees the synchronized refreshing of the Boost capacitor during very large duty ratios. The SP7653 also contains a number of valuable protection features. Programmable VIN UVLO allows the user to set the exact value at which the conversion voltage can safely begin down con- version, and an internal VCC UVLO which en- sures that the controller itself has enough volt- age to properly operate. Other protection fea- PIN DESCRIPTION # n i Pe m a N n i Pn o i t p i r c s e D 3 - 1P D N G r e i f i t c e r s u o n o r h c n y s e h t r o f n o i t c e n n o c d n u o r G 1 2 - 9 1 , 8 , 4D N G e r a r e v i r d r e w o p r e w o l d n a C I e h t f o y r t i u c r i c l o r t n o c e h T . n i P d n u o r G ) - ( e h t o t s e c a r t d n u o r g r e h t o m o r f y l e t a r a p e s n r u t e R . n i p s i h t o t d e c n e r e f e r C f o l a n i m r e t T U O . 5V B F t u p n i g n i t r e v n i e h t s i t I . n i p n o i t c e t e D t i u c r i C t r o h S d n a e g a t l o V k c a b d e e F r o f t n i o p k c a b d e e f e g a t l o v t u p t u o e h t s a s e v r e s d n a r e i f il p m A r o r r E e h t f o d e t s u j d a e b n a c d n a d e s n e s s i e g a t l o v t u p t u o e h T . r e t r e v n o C k c u B e h t V r e v e n e h W . r e d i v i d r o t s i s e r l a n r e t x e n a h g u o r h t B F e h t w o l e b V 5 2 . 0 s p o r d p u c c i h s r e t n e C I e h t d n a d e t c e t e d s i t l u a f t i u c r i c t r o h s a , e c n e r e f e r e v i t i s o p . e d o m 6P M O C t u p n i g n i t r e v n i e h t o t d e t c e n n o c y ll a n r e t n i s i t I . r e i f il p m A r o r r E e h t f o t u p t u O d n a n e s o h c s i n o i t a n i b m o c r e t li f l a m i t p o n A . r o t a r a p m o c M W P e h t f o V r o d n u o r g r e h t i e d n a n i p s i h t o t d e t c e n n o c B F e g a t l o v e h t e z il i b a t s o t . p o o l e d o m 7N I V U V n e e w t e b r e d i v i d r o t s i s e r a t c e n n o C . e g a t l o v n i V r o f t u p n i O L V U N I d n a V U N I . e g a t l o v g n i t a r e p o m u m i n i m t e s o t 9S S e h t t e s o t D N G d n a S S n e e w t e b r o t i c a p a c l a n r e t x e n a t c e n n o C . t r a t S t f o S w o l d l e h s i n i p S S e h T . t n e r r u c e c r u o s A µ 0 1 e h t n o d e s a b e t a r t r a t s t f o s . s n o i t i d n o c t l u a f ll a g n i r u d t n e r r u c ) n i m ( A m 1 a a i v 3 1 - 0 1V N I g n il p u o c e d a e c a l P . T E F S O M l e n n a h c - N e d i s h g i h e h t o t n o i t c e n n o c t u p n I P d n a n i p s i h t n e e w t e b r o t i c a p a c D N G . 6 2 - 3 2 , 6 1 - 4 1X LV d n a n i p s i h t n e e w t e b r o t c u d n i n a t c e n n o C T U O 7 1C Nt c e n n o C o N |
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