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AAT1102 Datasheet(PDF) 10 Page - Advanced Analog Technology, Inc. |
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AAT1102 Datasheet(HTML) 10 Page - Advanced Analog Technology, Inc. |
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10 / 18 page  Advanced Analog Technology, Inc. – 台灣類比科技股份有限公司 – – Advanced Analog Technology, Inc. – Page 10 of 18 V5.0 AAT1102 (BIN2) Inductor selection s IN IN peak L Lf D V I I 2 ) ( + = , where D is duty cycle And D I I o IN − = 1 , o IN V V D − = 1 , The inductor current rating must be greater than L(peak) I . Loop Compensation Design Fig.1. Closed-current loop for boost with PCM Fig.2. Block diagram of boost converter with PCM Power Stage Transfer Functions The duty to output voltage transfer function p T is: 2 2 2 0 2 ) )( ( ) ( n n z esr p o p w s w s w s w s T d v s T + + − + = = ξ Where ()( ) c L c O p r R D r V T + − − = 1 0 , c esr Cr w 1 = And ( ) L r D R w L z − − = 2 2 1 , () () c L L n r R LC r R D w + + − = 2 1 ( ) ( ) () ( ) ] 1 [ 2 ] 1 [ 2 2 L c L c L c L R D r r R LC L D r R r R r C − + + + − + + = ξ , F DS L R D Dr r r ) 1 ( − + + = L r is the inductor equivalent series resistance, c r is capacitor ESR, L R is the converter load resistance, C is output filter capacitor, DS r is the transistor on-resistance, and F R is the diode forward resistance. The duty to inductor current transfer function pi T is: 2 2 0 2 ) ( n n zi pi l pi w s w s w s T d i s T + + + = = ξ Where ( ) () , 2 0 c L c L O pi r R L r R V T + + = () c L zi r R C w + = 2 / 1 |
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