REGULATING PULSE WIDTH MODULATORS TO V OPERATION V REFERENCE TRIMMED TO Hz TO KHz OSCILLATOR RANGE SEPARATE OSCILLATORSYNC TERMINAL ADJUSTABLE DEADTIME CONTROL INTERNAL SOFT START PULSE BY PULSESHUTDOWN INPUT UNDERVOLTAGE LOCKOUT WITH

Stmicroelectronics

Description

Niveau: Supérieur, Doctorat, Bac+8
SG2525A SG3525A REGULATING PULSE WIDTH MODULATORS .8 TO 35 V OPERATION . 5.1 V REFERENCE TRIMMED TO ± 1 % . 100 Hz TO 500 KHz OSCILLATOR RANGE .SEPARATE OSCILLATORSYNC TERMINAL .ADJUSTABLE DEADTIME CONTROL . INTERNAL SOFT-START .PULSE-BY-PULSESHUTDOWN . INPUT UNDERVOLTAGE LOCKOUT WITH HYSTERESIS . LATCHING PWM TO PREVENT MULTIPLE PULSES .DUAL SOURCE/SINK OUTPUT DRIVERS DESCRIPTION The SG3525Aseries of pulse width modulator inte- grated circuits are designed to offer improved per- formance and lowered external parts count when used in designing all types of switching power sup- plies. The on-chip + 5.1 V reference is trimmed to ± 1 % andthe inputcommon-mode rangeof the error amplifier includes the reference voltage eliminating external resistors. A sync input to the oscillator al- lows multiple units to beslaved or a single unit to be synchronized to an external system clock. A single resistorbetweentheCT andthe dischargeterminals provide a wide range of dead time ad- justment. Thesedevicesalso featurebuilt-insoft-startcircuitry with only an external timing capacitor required. A shutdownterminal controlsboth the soft-start circu- ity and the output stages, providing instantaneous turn off through the PWM latch with pulsed shut- down, as well as soft-start recycle with longer shut- down commands. These functionsare also control- ledby an undervoltagelockoutwhich keepsthe out- puts off and the soft-start capacitor discharged for sub-normal input voltages.

• input bias


• output


• temperature stability


• oscillator al- lows


• iosc oscillator


• resistance junction


• current

Sujets

• Régulation
• Thermal
• Output
• Current

Informations

• Publié par: profil-zyak-2012
• Nombre de lectures: 8
• Langue: English

Extrait

   S S G G 3 2 5 5 2 2 5 5 A A REGULATINGPULSEWIDTHMODULATORS 5 8 .1 TO V 3 R 5 E V FE O R P E E N R C A E TI T O R N IMMEDTO ± 1% 1 S 0 E 0 P H A z R T A O TE 5 O 00 S K CI H L z LA O T S O CI R L S L Y AT N O C R TE R R AN MI G N E AL I A N D T J E U R S N T A A L B S LE OF D T E -S A T D A TI R M T ECONTROL PULSE-BY-PULSESHUTDOWN . I H N Y P S U T T ER U E N SI D S ERVOLTAGELOCKOUTWITH DIP1616(Narrow) . LATCHINGPWMTOPREVENTMULTIPLE PULSES . DUALSOURCE/SINKOUTPUTDRIVERS DESCRIPTION g T r h a e te S d G ci 3 r 5 c 2 ui 5 ts As ar e e rie d s e o si f g p n u e ls d e to wi o d f t f h er m im od p u r l o a v t e o d ri p nt e e r - - t d u o r w n n o , ff as th w ro el u l g a h s t s h o e ft- P st W art M r l e a c t y c c h le w w it i h th p lo ul n s g e e d rs s h h u u t t - - formanceandloweredexternalpartscountwhen downcommands.Thesefunctionsarealsocontrol- p u l s ie e s d . i T n h d e e o si n g - n c i h n ip g + all 5 t . y 1 p V es re o f f e s re w n it c c e hi is n t g ri p m ow m e e r d s t u o p ± - l p e u d ts by of a f n a u n n d d t e h r e vo s l o t f a t- g s e t l a o rt ck c o a u p t a w ci h t i o c r h d k is e c e h p a s r t g h e e d o f u o t r - a 1 m % pl a ifi n e d r t i h n e cl i u n d p e u s t t c h o e m r m ef o e n r - e m nc o e de vo r l a ta n g g e e e o l f i t m h i e na e t r i r n o g r c s l u u b d - e n s or ap m p a r l o in xi p m ut at v e o l l y ta 5 g 0 e 0 s. m T V hi o s f l h o y c s k te o r u e t s c i i s r f c o u r it j r it y t i e n r- - l e o x w te s rn m a u l lt r i e pl s e is u to n r it s s . t A o s b y e n s c la i v n e p d ut o t r o a t s h i e ng o l s e c u ill n a it t t o o r b al e - f c r u e it e s o is pe a ra l ti a o tc n h . f A o n ll o o th wi e n r g fe t a h t e ur c e o o m f p t a h r e a s t e or P . W On M ce cir a - r s e y s n is c t h o r r o b ni e z t e w d e t e o n a th n e e C xt T e a rn n a d l t s h y e s d t i e s m ch c a l r o g c e k. te A rm si i n n g a l l e s t P he W o M ut p p u u l t s s e w s ill h r a e s m b a e i e n n o t ff e f r o m r i t n h a e te d d ur f a o t r io a n n o y f r t e h a e s p o e n - , provideawiderangeofdeadtimead-justment. Thesedevicesalsofeaturebuilt-insoft-startcircuitry r o io ut d p . u T t h s e ta la g t e c s hi a s re re t s o e t t em wi - t p h ol e e ac d h es c i l g o n c s k c p a ul p s a e b . le Th o e f s w h it u h td o o n w ly nt a e n rm e i x n te al rn c a o l n t t i r m ol i s n b g o c th a t p h a e ci s to o r ft r - e st q a u r i t r c e ir d c . u A - s S o G u 3 rc 5 i 2 n 5 g A o o r ut s p i u n t k s i t n a g g i e n fe e at x u c r e e s s s N o O f R 2 l 0 o 0 gic, m g A i . vin T g h a e ityandtheoutputstages,providinginstantaneous LOWoutputforanOFFstate. PINCONNECTIONSANDORDERINGNUMBERS(topview) June2000 TypePlasticDIPSO16 SG2525ASG2525ANSG2525AP SG3525ASG3525ANSG3525AP 21/1