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C2183 Schematic ( PDF Datasheet ) - Cambridge Semiconductor

Teilenummer C2183
Beschreibung power controller Design Guide
Hersteller Cambridge Semiconductor
Logo Cambridge Semiconductor Logo 




Gesamt 30 Seiten
C2183 Datasheet, Funktion
C2183
Design Guide
C2183
Design Guide
DG-5479-1212
17-Dec-2012
Preliminary
Preliminary
© Cambridge Semiconductor Ltd 2012
Page 1
Confidential
DG-5479-1212
17-Dec-2012






C2183 Datasheet, Funktion
2 DESIGN FLOW
2.1 Overview
Define Input Parameters
Customer / datasheet
defined; Assumptions
IC Selection
Switching Frequency;
Cable Comp
AC Front End Circuit
Design
Transformer Design
Current Sense Circuit
Design
Output Circuit Design
Vdd and Auxiliary Circuit
Design
Voltage Sense Circuit
Design
Switch Selection
PCB Layout
Input Resistor; Bulk Cap;
Filter Inductor; Rectifier
Core type; Size; Material
Winding Topology
Calculations: turns,
primary inductance,
peak current etc
Current Sense Resistor
Output Diode; Dummy
Load Resistor; Capacitor
Output Snubber
Primary Clamp
Testing and
Troubleshooting
VDD Cap; AUX Cap;
AUX Diode;
Start-up Resistors
No-load operation
Feedback Resistors
Protection Levels
Voltage / current ratings
Function Consideration
EMC Consideration
Thermal Consideration
Figure 4: Design Flow Process
Preliminary
© Cambridge Semiconductor Ltd 2012
Page 6
Confidential
C2183
Design Guide
Drain voltage @
100%, 50%, 0% Load
Assess switching
Frequency vs Load
AUX Voltage vs Load
Startup / Load Pull Up
Efficiency
No Load Power
Ripple
Thermal
DG-5479-1212
17-Dec-2012

6 Page









C2183 pdf, datenblatt
C2183
Design Guide
N max (1  VFET ) VDSMAX VOVER 2 VIN (MAX )
VSCV
VDSMAX is the primary switch (FET) voltage rating; VOVER is the switch voltage overshoot at turn off; VMAINSHI is
the high mains RMS value; and VFET is the worst-case voltage margin dependent on the de-rating of the
primary switch.
The lower of the two values (Nopt and Nmax) is chosen. If Nmax < Nopt then N = Nmax and the minimum
input voltage at which the converter is still in regulation at full power is re-calculated. It is better to use Nopt
where possible, but a higher rated MOSFET may be required.
VINREGMIN
2 N PPFL VSCV VCSCC
2 PPFL VCSCC I OUTCC VSCV VCSMAX
Note that if VINREGMIN is chosen to be greater than VDCMIN, low mains ripple may be seen at full-load.
Current Sense Resistors (Rcs and Rcsesd)
Based on these calculations, the Rcs resistor can be calculated using the formula:
Rcs
N VCSCC
I OUTCC
K CS
Where N is the calculated turns ratio and KCS is the current regulation accuracy factor. The CS input limit for
CC operation, VCSCC can be found in the datasheet. IOUTCC is the constant current regulation point.
It may be necessary to use multiple resistors to get the required value. Alternatively, the number of primary
turns can be adjusted to allow a standard resistor value to be used. Either way, the output current regulation
point needs to be recalculated.
I OUTCC
N VCSCC
Rcs
K CS
For ESD protection, it may be necessary to add a 1k resistor adjacent to the CS pin as Rcsesd.
2.5.4 Transformer Peak Current and Inductance
Using the above values, the following parameters need to be checked. The primary peak current with the
actual Rcs value needs to be calculated.
I PK
VCSMAX
(1 K CTRLTOL )
Rcs
The primary inductance is calculated to provide full-load primary power, PPFL at the maximum switching
frequency, fMAX.
LP
2 PPFL
I PK 2 f MAX
In no-load operation, it is important that the minimum secondary conduction time, TSMIN is longer than the
feedback blanking time, TFBBL of the controller as shown below. TFBBL is given in datasheet.
Preliminary
© Cambridge Semiconductor Ltd 2012
Page 12
Confidential
DG-5479-1212
17-Dec-2012

12 Page





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