f 0, : = jπfl Z C f 0, (ESR) A C = ε r ε 0 d (d) (A) 4 (ESR) (L) (Z C ) (Z C ) 4 (f 0 ) # (C) (L) :, f 0 = π LC f 0, 5 PCB (V IN ) (R L ) ESL, V IN R

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1 PCB (, 000) : PCB PCB PCB PCB PCB Basic PCB Layout Guidelines for On Board Power Supply Development Chen Zhou Semtech International AG, Shanghai Abstract: PCB layout of on board power supply is one of the most critical tasks of a product designer. In many cases, a well designed power supply on paper may turn out to be unworkable due to poor PCB layout. In this paper, basic guidelines of power supply PCB layout are presented. Several practical power supply layout examples are explained in detail. Keywords: PCB layout, power supply. VIN R C C 4.uF/V 00uF/V C5 0R 00uF/V U COMP/SS SENSE D DN44 C4 4nF C uf GND VCC DL PHASE AC DC C 4 5 R5 DH BST nf D DN44 SC04 C K Q 4.uF C9 R.R R uf VOUT 5.R L 00uF/.V 00uF/.V 00uF/.V uh Q R9 R0.R PCB.R C C C0 C 4.uF C4 n R.5K C5 R nf.5k R4 k PCB PCB V,.V, 5A ) PCB. PCB PCB. PCB

2 f 0, : = jπfl Z C f 0, (ESR) A C = ε r ε 0 d (d) (A) 4 (ESR) (L) (Z C ) (Z C ) 4 (f 0 ) # (C) (L) :, f 0 = π LC f 0, 5 PCB (V IN ) (R L ) ESL, V IN R L Z C = j π fc V IN R L

3 (A C ) (l m ) (L) (ESR) (C P ) (Z L ) 5 PCB (a) (b). (Z L ) (f 0 ) (L) (C B(t) P ) : f0 = π LC P f 0, Z L = jπfl f 0, : Z L = j π fc f 0, (ESR) (C P ) AC L = µ (C 0 P ) lm

4 9 PCB (a) (b). PCB 0 (C P ) (C) #4 #5 # # # # #5 (C P ) (C) 0 (a) (b) 9 PCB (V IN ) 0 (a) (R L ) C P, V IN 0 (b) R L V IN R L # 4

5 #4 PCB (VIAS) PCB (Ground Plane).4.5 # #5 4 4 (Decouple) ESL PCB 5 5

6 5. # PWM.. PCB COMP/SS SENSE D DN44 C4 4nF C uf GND VCC DL PHASE C 4 5 R5 DH BST nf D DN44 SC04 C (Analog) (Digital) K Q 4.uF C9 R.R R uf 5.R VOUT L 00uF/.V 00uF/.V 00uF/.V uh Q R9 R0.R.R C C C0 C 4.uF C4 PCB n R.5K PCB C5 R nf.5k R4 k ( ) ( ) U R 0R VIN C 00uF/V C 00uF/V 4.uF/V C5

7 . PCB 0 PCB, (C IN ) (ESL) C IN PCB # # (L) 9 (C P ), (C OUT ) (ESL) ( #) (C IN ), (Q) (Q) ( #) (Q), PCB (L), (C OUT ) # # # (Q) (Q) # (L) # Q Q L (L) (C OUT ) PCB 9 PCB 0 PCB. PCB 0 PCB V CC (GND) ( )

4 C4 4nF C R5 nf K U COMP/SS SENSE GND VCC DL PHASE 4 5 DH BST D SC04 R 0R C uf DN44 Q R.R Q R0.R C 4.uF VIN D DN44 C9 R uf 5.R L uh R9.R C4 C C 4.uF/V 00uF/V 00uF/V C5 VOUT 00uF/.V 00uF/.V 00uF/.V C C C0 C 4.

8 4 C4 4nF C R5 nf K U COMP/SS SENSE GND VCC DL PHASE 4 5 DH BST D SC04 R 0R C uf DN44 Q R.R Q R0.R C 4.uF VIN D DN44 C9 R uf 5.R L uh R9.R C4 C C 4.uF/V 00uF/V 00uF/V C5 VOUT 00uF/.V 00uF/.V 00uF/.V C C C0 C 4.uF (SC04A) PCB PCB n R.5K C5 R nf.5k.4 PCB R4 k 4 V.V A (Semtech SC459) # DVD ADSL. PCB ( ) PCB V.V 5A PWM (Semtech SC04) PCB PCB 4 Vin +V ) (V IN ), (V OUT ), (C), (C), (D), PCB ( ) (SC459) (R, R), (R, C4, C5), (EN), (SYNC) (PCB ) (C, C), (Q), (Q), ) (SC459) ( #4) (L), (C0, C, C, (VIA) C), (PCB ) R0 0 C 0uF EN 4.k R4 SYNC IN SW 5 EN FB SYNC BST GND COMP SC459 C5 00pF C 0.uF C4.5nF R 4.K D D N44 L.uH R.9K R 9.K (V,.V/.5A ) PCB ) (C), (SC459) (GND), (D) C D SC459 C 0uF +.V Vout

uF 9 R K 4 5 R 0K C4 0.uF 0 SS/SD OSC SYNC POK BD4 FB4 BD FB 5 AVCC AGND PVCC U SC45 PGND R 0K 4 BDI ILIM VIN ILIM BST GDH PH GDL FB EO BST GDH PH GDL FB EO R 5K 9 0 5 4 R R5 R 0K.9nF C 4pF C 0.

9 5 5 5 PCB (V IN ) PCB, (V OUT ) PCB (L) PCB, (R, C4, C5) PCB D (SC459) PCB (C) SC459 PCB PCB (SC459).4 PCB 5 SC459 PCB PCB V 5V.V,.V,.V,.V (Semtech SC45) SC45 4.5V 0V 00KHz 5A 0.5V TSSOP- +Vin +5Vin C 0uF/.V C 0uF/.V C uf D D N59HW N59HW C 0uF/V R 0 +.Vin +.5V/A +.V/0.A C5 uf C9 uf C9.nF C0 R 0uF Q K FZT49 C4 0uF R0 4.K C 00pF U SC5 IN GND SHDN GND ADJ GND 4 5 OUT GND C5 0.uF 9 R K 4 5 R 0K C4 0.uF 0 SS/SD OSC SYNC POK BD4 FB4 BD FB 5 AVCC AGND PVCC U SC45 PGND R 0K 4 BDI ILIM VIN ILIM BST GDH PH GDL FB EO BST GDH PH GDL FB EO R 5K R R5 R 0K.9nF C 4pF C 0.uF R C4.nF R C 4pF C 0.uF 4 4 Q- FDS9A TP Q- FDS9A Connect both the power ground and control ground at U pin C R0 0K Q- FDS9A TP Q- FDS9A L 5uH L 0uH R4.0K R9 4.99K R5.0K R 0K C.5nF R 50 C nf R 50 C 00uF/.V C 00uF/.V +.V/A +.V/A 9

10 .V 5V,.V V,.V.V.V PCB (SC45) 0 SC45 (SC45 ) 0 # 4. PCB ), SC45 ) ) 4) 5) ) ) 9 ) SC45 0

11 [] Schmitt, Ron. Electromagnetics Explained. [] Fluke, John. Controlling Conducted Emissions By Design. [] Montrose, Mark. EMC and the Printed Circuit Board: Design, Theory, and Layout Made Simple. [4] Erickson, Robert W. Supplementary Notes on EMI and Layout Fundamentals for Switched-Mode Circuits. [5] Novak, Istvan. Powering Digital Boards, Distribution and Performance. [5] SC04 Datasheet. Semtech International AG. [] SC459 Datasheet. Semtech International AG. [] SC45 Datasheet. Semtech International AG.

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