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TYPICAL APPLICATIONS
COMPONENT SELECTION AND PCB DESIGN CONSIDERATIONS
This section provides a comprehensive procedure for the
selection of external components to achieve proper device
operation. It also explains PCB layout design considerations.
CTRL
Figure 22. Component Selection Application Diagram for the 34848
COMPONENT SELECTION
ASSUMPTIONS FOR CALCULATIONS
of the inductor never falls to zero. Then the following formula
is used,
× D ( 1 ? D )
V IN = 21.6 V
V PVCC = 12 V
I OUT = 0.9 A.
f SW = 700 kHz
L =
V OUT + V D
I OUT × r × f SW
2
V DVDD = 3.3 V
V OUT = 39 V
R MAP = 0.23 V/A
ESR = 10 m Ω
where:
Current ripple ratio = 0.4, which is a good
SELECTING THE INDUCTOR FOR THE BOOST
CONVERTER
r =
Δ I
I L
design target for any switching frequency.
A first approach to determine the value of the inductor is to
consider the continuous conduction mode, that is, the current
34848
Analog Integrated Circuit Device Data
28
Freescale Semiconductor
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相关代理商/技术参数
MC34849 制造商:SPC Multicomp 功能描述:HEADER VERTICAL 16WAY 制造商:SPC Multicomp 功能描述:WIRE-BOARD CONN, RECEPTACLE, 16POS, 3MM; Series:2261(5561); Pitch Spacing:3mm; Contact Termination:Through Hole Vertical; No. of Contacts:16; No. of Rows:2; Connector Mounting:PCB; Gender:Receptacle; Contact Material:Copper Alloy ;RoHS Compliant: Yes
MC34851 制造商:SPC Multicomp 功能描述:HEADER VERTICAL 18WAY 制造商:SPC Multicomp 功能描述:HEADER, VERTICAL, 18WAY
MC34853 制造商:SPC Multicomp 功能描述:HEADER R/ANGLE 16WAY 制造商:SPC Multicomp 功能描述:HEADER, R/ANGLE, 16WAY 制造商:SPC Multicomp 功能描述:WIRE-BOARD CONN, RECEPTACLE, 16POS, 3MM; Series:2261(5561); Pitch Spacing:3mm; Contact Termination:Through Hole Right Angle; No. of Contacts:16; No. of Rows:2; Connector Mounting:PCB; Gender:Receptacle; Contact Material:Copper Alloy ;RoHS Compliant: Yes
MC34855 制造商:SPC Multicomp 功能描述:HEADER R/ANGLE 18WAY 制造商:SPC Multicomp 功能描述:HEADER, R/ANGLE, 18WAY
MC34857 制造商:SPC Multicomp 功能描述:HEADER VERTICAL SMT 2WAY 制造商:SPC Multicomp 功能描述:HEADER, VERTICAL, SMT, 2WAY 制造商:SPC Multicomp 功能描述:WIRE-BOARD CONN, RECEPTACLE, 2POS, 3MM; Series:2261(5561)R; Pitch Spacing:3mm; Contact Termination:Surface Mount Vertical; No. of Contacts:2; No. of Rows:2; Connector Mounting:PCB; Gender:Receptacle; Contact Material:Copper Alloy ;RoHS Compliant: Yes
MC34859 制造商:SPC Multicomp 功能描述:HEADER VERTICAL SMT 4WAY 制造商:SPC Multicomp 功能描述:HEADER, VERTICAL, SMT, 4WAY 制造商:SPC Multicomp 功能描述:WIRE-BOARD CONN, RECEPTACLE, 4POS, 3MM; Series:2261(5561)R; Pitch Spacing:3mm; Contact Termination:Surface Mount Vertical; No. of Contacts:4; No. of Rows:2; Connector Mounting:PCB; Gender:Receptacle; Contact Material:Copper Alloy ;RoHS Compliant: Yes
MC3486 制造商:Panasonic Industrial Company 功能描述:I.C. (I)
MC34861 制造商:SPC Multicomp 功能描述:HEADER VERTICAL SMT 6WAY 制造商:SPC Multicomp 功能描述:HEADER, VERTICAL, SMT, 6WAY 制造商:SPC Multicomp 功能描述:WIRE-BOARD CONN, RECEPTACLE, 6POS, 3MM; Series:2261(5561)S; Pitch Spacing:3mm; Contact Termination:Surface Mount Vertical; No. of Contacts:6; No. of Rows:2; Connector Mounting:PCB; Gender:Receptacle; Contact Material:Copper Alloy ;RoHS Compliant: Yes