1、 7 1 e 9 Switching power supply control loop design ASTEC Application Note 5 r smartway 1 7 1 T q q 7 1 Y H W b y 7 q B Q M 7 P Y H W e d b e 9 J Z T P 7 1 e 9 G i O 9 m s 9 m b p m 9 m m V U b y 1 9 m V m M F b d M M M b 2 2 Z T s H 3 B b m 9 m 20dB E q 7 S h H p m 3 B b m 1 B Y r o Y d 3 B b f p m
2、 9 B i b 2 3 S f s 0 H 3 b p m 3 9 m 20dB E q 7 S 9 i 90 M b m 2 B Y r o b i M 7 d b 9 m 9 90 M b C BOOST BUCK BOOST 9 Q H 1 d P d q v v q b p m n m 3 b 3 0 7 1 X 9 m M m 9 e d n 5 A b l S b Y S y B e p m r K z d Y K L q K z b X p m c M z z 9 m b M E D i H W b z z d y Y L l M b 9 m z L q b 3 1 M A m
3、 4 M q M 0 b v e d S 4 V 180 7 S M b DC Q 4 180 S M M b L 180 M M DC i M V 0 7 S b 1 d M v 0 H N d b 7 B H u i N H u r d Y V B H W K b T M l 45 5 d H b M V 45 H 4 K z Y H W K V b 3 2 9 m z 9 m z 9 m H q n m 4 9 m z q Fcs b K v q 1 K y 7 1 q b T q l 2 q B E l 2 K v q r 5 b 7 1 7 1 q V V o A p i O A e
4、 b y N d q A l 7 1 q B 5 7 1 2 o e w X 1 i d b 3 3 9 m d 9 m z L q 4 1 D b P PWM 1 Y M H M 7 1 b 1 Y 1 9 m M W S b 4 L 9 s e s Z E 7 1 e s 1 s r o PWM b v Q b m 5 Z v m s m 6 B 7 1 m b n 5 Q Q b v P M 1 7 3 B b z s G i O q M M 1 i a b 1 e s q b r o s P 1 q M W o P Q e b B s 9 m M i d f d 9 m M b 4 1
5、 Q H s Q b v I T e E s T 4 2 r o s G1 S T e d r S b r o s S b l s ESR Q E R1 R2 R FB Q r o f b m 7 s ESR R SENSE Y b f G1 S R FB S 9 m b 9 m f POLE 1 2 R FB ESR C 7 S O i f ZERO 1 2 ESR C M b G1 S p m n m 8 b 4 3 PWM s G2 S b v 3 H b AS3842 PWM Y V H q M 1 b q r 5 b 1 4 H X 1 b l f 1 1 9 m b R5 R6 T
6、 5 B i R5 r 5 1 K E i O AS3842 b v E F N R5 AS3842 7 1 b v s E F r b B o Secondary error amplifier with the AS431 p b V b v AS3842 COMP f V CATHODE AS431 9 b v b CTR 1 b R5 R6 r 5 1 K E b R COMP AS3842 COMP k m V K v H E F b 1 b m 9 V U B 1 7 1 s e m d V COMP I SENSE b y N I PRIMARY V COMP r V I SEC
7、ONDARY n m 9 H H 1 T 4 V U H V COMP W 1 b T 3 6 PWM s f f G2 s c 9 m M M b 4 4 b v G3 S B r o PWM s f V b v K d b m 10 B H 4 q O 9 m Z b Z B t z a b v 9 m e O b 4 5 d y B L d V F Z E d f b Y V s 9 m M F 3 d p m b Y V b P d K b m 11 s p m Q d 180 M M 9 F b 5 T B 150W T V l A U d Y H T b m 13 m 12 r 9
8、 m M m b m 11 Z U B M p m w L b N 9 m M m A U d 86 7 M b i d y Y b m 15 m 13 r d Y b Z U M T Y V 9 F d 9 m 4 q d M h b q 4 H d M h b m 12 m 14 r q M 65 H d p m b Y n m 14 m 15 r i M v H W b V 1 1 9 m v l d W L q M b 9 m L q b i M 9 m W b 6 Z E T k E F A v E F b m 6 k b v H PWM H b k AS3842 V COMP b E F V V COMP A H E F E F E F b b v PWM k V r o P b v M 1 b 2006 6 6
