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SC4809B Datasheet(PDF) 8 Page - Semtech Corporation

Part # SC4809B
Description  High Performance Current Mode PWM Controller
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Manufacturer  SEMTECH [Semtech Corporation]
Direct Link  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

SC4809B Datasheet(HTML) 8 Page - Semtech Corporation

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 2005 Semtech Corp.
www.semtech.com
SC4809A/B/C
POWER MANAGEMENT
Application Information
The flyback power stage is very popular in 48V input
telecom applications for output power levels up to
approximately 50 watts. The exact power rating of the
flyback power stage, of course, is dependent on the input
voltage/output voltage combination, its operating
environment and many other factors. Additional output
voltages can be generated easily by simply adding another
winding to the coupled inductor along with an output
diode and output capacitor. Obtaining multiple output
voltages from a single power stage is another advantage
of the flyback power stage.
A simplified schematic of the flyback power stage with a
drive circuit block included is shown in Figure 1. In the
schematic shown, the secondary winding of the coupled
inductor is connected to produce output voltage. The
power switch, Q1, is an N-channel MOSFET. The
secondary inductance, L
SEC and capacitor C, make up the
output filter, The resistor R, represents the load seen by
the power supply output.
Figure 1: Flyback Power Converter
The important waveforms of the flyback power stage
operating in DCM are shown in Figure 2.
Figure 2: Discontinuous Mode Flyback Waveforms
The simplified voltage conversion relationship for the
flyback power stage operating in CCM is given by:
D
1
D
N
N
V
V
P
S
I
O
=
The simplified voltage conversion relationship for the
flyback power stage operating in DCM is given by:
K
D
N
N
V
V
P
S
I
O
=
Where K is defined as:
S
SEC
T
R
L
2
K
=


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