FSEZ13X7 datasheet(3/16 Pages) FAIRCHILD

Part #	FSEZ13X7

Description	Primary Side Regulated (PSR) Flyback Converter

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Manufacturer	FAIRCHILD [Fairchild Semiconductor]

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3 / 16 page

AN-8033

www.fairchildsemi.com

Rev. 1.0.1 • 5/6/10

3

3. Design Consideration

Converters with Constant Current (CC) output require

more design consideration than the conventional power

supply design with a fixed output voltage. In CC

operation, the voltage for control IC (VDD), which is

usually obtained with an auxiliary winding of the

transformer, changes with the output voltage. Thus, the

VDD operation range determines the constant current

control range. FAN103 and FSEZ13X7 have a wide

supply voltage (VDD) operation range from 5V up to 24V,

which allows stable CC regulation even with output

voltage lower than a quarter of its nominal value.

Another important design consideration for CC operation

is that the transformer should be designed to guarantee

DCM operation in all operation range since the output

information is properly obtained only in DCM operation,

as described in Section 2. As seen in Figure 4, the

MOSFET conduction time (tON) decreases as output

voltage decreases in CC mode. Meanwhile, the diode

conduction time (tD) increases as the output voltage

decreases. Since the increase of tON is dominant to the

decrease of tON in determining the sum of tON and tD, the

converter tends to enter CCM as output voltage decreases.

FAN103 and FSEZ13X7 have a frequency reduction

function to prevent CCM operation by extending the

switching period, which is activated when the output

voltage drops below 70% of its nominal value, as depicted

in Figure 5. Therefore, 70% of output voltage and

minimum output voltage are the two worst cases for the

transformer design.

The transformer should be designed for DCM both at 70%

of nominal output voltage and minimum output voltage.

Once the converter is designed to operate in DCM at 70%

of nominal output voltage and minimum output voltage,

DCM operation is guaranteed for entire load range.

I

ds

V

ds

I

ds

V

ds

tON

tD

IPK

tON

CC

tD

CC

/

CC

OO

VV

k

=

IPK

CC

/

CC

ON

TT

k

=

CC

DD

TT

k

=⋅

Figure 4. tON and tD Change as Output Voltage

Decreases

Figure 5. Operation Range of Charger with CC/CV

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