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CS1601 データシート(PDF) 9 Page - Cirrus Logic

部品番号 CS1601
部品情報  Digital PFC Controller for Electronic Ballasts
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メーカー  CIRRUS [Cirrus Logic]
ホームページ  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

CS1601 データシート(HTML) 9 Page - Cirrus Logic

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CS1601
DS931PP6
9
5. GENERAL DESCRIPTION
The CS1601 offers numerous features, options, and
functional capabilities to the electronic product lighting
designer. This digital PFC control IC is designed to replace
legacy analog PFC controllers with minimal design effort.
5.1 PFC Operation
One key feature of the CS1601 is its operating frequency
profile. Figure 11 illustrates how the frequency varies over half
cycle of the line voltage in steady-state operation. When
power is first applied to the CS1601, it examines the line
voltage and adapts its operating frequency to the line voltage
as shown in Figure 11. The operating frequency is varied from
the peak to the trough of the AC input. During startup, the
control algorithm generates maximum power while operating
in critical conduction mode (CRM), providing an approximate
square-wave current envelop within every half-line cycle.
Figure 11. Switching Frequency vs. Phase Angle
Figure 12 illustrates how the operating frequency of CS1601
(as a percentage of maximum frequency) changes with output
power and the peak of the line voltage.
Figure 12. CS1601 Max Switching Freq vs. Output Power
Figure 13 illustrates how the operating frequency of CS1601H
changes with output power and the peak of the line voltage.
Figure 13. CS1601H Max Switching Freq vs.Output Power
When PO falls below 5%, the CS1601 changes to Burst Mode.
(Refer to Burst Mode section for more information.)
The CS1601 is designed to function as a DCM controller.
However, during peak periods, the controller may interchange
control methods and operate in a quasi-critical-conduction
mode (quasi-CRM) at low line. For example, at 108VAC main
input under full load, the PFC controller will function as a
quasi-CRM controller at the peak of the AC line cycle, as
shown in Figure 14.
Figure 14. DCM and quasi-CRM Operation with CS1601
The zero-current detection (ZCD) of the boost inductor is
achieved using an auxiliary winding. When the stored energy
of the inductor is fully released to the output, the voltage on the
ZCD pin decreases, triggering a new switching cycle. This
quasi-resonant switching allows the active switch to be turned
on with near-zero inductor current, resulting in a nearly
lossless switch event. This minimizes turn-on losses and EMI
noise created by the switching cycle. Power factor correction
control is achieved during light load by using on-time
modulation.
0
20
40
60
80
100
120
045
90
135
180
Rectified Line Voltage Phase (Deg.)
Switching Freq. (% of Max.)
Line Voltage (% of Max.)
% POmax
20
70
60
40
40
5
20
0
60
80
100
48
Vin >156 VAC (Input Voltage 108 – 305 VAC, Vlink = 460V)
Vin <182 VAC (Input Voltage 108 –305 VAC , Vlink = 460V)
Vin <158 VAC (Input Voltage 90 –264 VAC, Vlink = 400 V)
Vin >136 VAC (Input Voltage 90 –264 VAC, Vlink = 400 V)
% PO max
100
75
25
0
50
Vin> 156 VAC (Input Voltage 108 –305 VAC , V
link = 460V)
Vin< 182 VAC (Input Voltage 108 –305 VAC, Vlink = 460 V)
Vin< 158 VAC (Input Voltage 90– 264 VAC, Vlink = 400V)
Vin >136 VAC (Input Voltage 90 –264 VAC , Vlink = 400V)
20
40
5
60
80
100
DCM
Quasi CRM
DCM
Quasi CRM
DCM
ILB
t [ms]
IAC


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