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CS1500 Folha de dados(PDF) 8 Page - Cirrus Logic

Nome de Peças CS1500
Descrição Electrónicos  Digital Power Factor Correction IC
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Fabricante Electrônico  CIRRUS [Cirrus Logic]
Página de início  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

CS1500 Folha de dados(HTML) 8 Page - Cirrus Logic

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CS1500
8
DS849A5
May ?$shortyear>
CONFIDENTIAL
3.1 PFC Operating Frequency
One key feature of the CS1500 is its operating frequency
profile. Figure 10 illustrates how the frequency varies over half
cycle of the line voltage in steady-state operation. When
power is first applied to the CS1500, it first examines the line
voltage and adapts its operating frequency to the exposed line
voltage as shown in Figure 11. The operating frequency is
varied in about a 2-to-1 ratio from the peak to the trough.
During start-up the control algorithm limits the maximum on-
time, provides nearly square-wave envelop current within
every half line cycle by adjusting the operating frequency for
fast startup behavior.
Figure 10. Switching Frequency vs. Phase Angle
Figure 11. Switching Frequency vs. Output Power
Figure 11 illustrates how the operating frequency (as a
percentage of maximum frequency) changes with output
power and the peak of the line voltage. Burst mode (when Po
below 5%) will be discussed in a later section.
The CS1500 is designed to function as a DCM (discontinuous
conduction mode) controller, however it may operate in a
quasi-CRM operation mode near the peak periods. For
90~265VAC main input applications, PFC can be also
designed in quasi-CRM at a peak of 90VAC and full load as
shown in Figure 12.
Figure 12. DCM and quasi-CRM Operation with CS1500
3.2 Start-up vs. Normal Operation Mode
CS1500 has two discrete operation modes: Start-up and
Normal. Start-up mode will be activated when Vlink is less than
90% of nominal value and remains active until Vlink reaches
100% of nominal value, as shown in Figure 13. Startup mode
is activated during initial system power-up. Any Vlink drop to
less than 90% of nominal value, such as load change, can
cause the system to enter Start-up Mode until Vlink is brought
back into regulation.
Figure 13. Start-up and Normal Modes
3.3 Burst Mode
Burst mode is utilized to improve system efficiency when the
system output power (Po) is < 5% of nominal. Burst mode is
implemented by intermittently disabling the PFC over a full
half-line period cycle under light load conditions, as shown in
Figure 14.
0
20
40
60
80
100
120
045
90
135
180
Rectified Line Voltage Phase (Deg.)
Switching Freq. (% of Max.)
Line Voltage (% of Max.)
% PO max
Vin < 150 VAC
20
70
50
60
40
40
5
20
0
60
80
100
Vin > 150 VAC
46
56
DCM
Quasi CRM
DCM
Quasi CRM
DCM
ILB
t [ms]
IAC
t [ms]
Vlink
[V]
100%
90%
Normal
Mode
Normal
Mode


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