CY8CLEDAC02 Cypress Semiconductor Corp, CY8CLEDAC02 Datasheet - Page 11

• Manufacturer Part Number: CY8CLEDAC02
• Description: IC CTLR AC-DC DIMMABLE LED 8SOIC
• Manufacturer: Cypress Semiconductor Corp
• Type: High Power, AC Input, Dimmabler

Specifications of CY8CLEDAC02

• Package / Case: 8-SOIC (3.9mm Width)
• Voltage - Supply: 8 V ~ 16 V
• Frequency: 200kHz
• Operating Temperature: -40°C ~ 85°C
• Number Of Outputs: 1
• Internal Switch(s): No
• Efficiency: 85%
• Topology: AC DC Offline Switcher
• Operating Supply Voltage: - 0.3 V to 18 V
• Maximum Supply Current: 20 mA
• Maximum Power Dissipation: 526 mW
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Operating Temperature (min): -40C
• Operating Temperature (max): 85C
• Operating Temperature Classification: Industrial
• Pin Count: 8
• Mounting: Surface Mount
• Operating Supply Voltage (max): 18V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Output: -
• Current - Output / Channel: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Figure 12. Auxiliary Voltage Waveforms
The voltage at the load differs from the secondary voltage by a
diode drop and IR losses. The diode drop is a function of current,
as are IR losses. Thus, if the secondary voltage is always read
at a constant secondary current, the difference between the
output voltage and the secondary voltage is a fixed
if the voltage can be read when the secondary current is small;
for example, at the knee of the auxiliary waveform (see
Figure
can be ignored.
The real time waveform analyzer in the CY8CLEDAC02 reads
the auxiliary waveform information cycle by cycle. The part then
generates a feedback voltage V
represents the output voltage and is used to sense the output
voltage.
Document Number: 001-54879 Rev. *C
12), then

V is also small. With the CY8CLEDAC02,
FB_C
. The V
FB_C
signal precisely

V. Further,

V
Valley Mode Switching
To reduce EMI and switching losses in the MOSFET, the
CY8CLEDAC02 employs valley mode switching by switching at
the lowest MOSFET V
MOSFET drain voltage indirectly through the V
voltage is provided by the auxiliary winding of the flyback trans-
former and represents a copy of the secondary side character-
istics (see
Figure 13. Valley Mode Switching
Turning on at the lowest V
mode switching can also reduce EMI. To limit the switching
frequency range, the CY8CLEDAC02 can skip valleys (as shown
in the first cycle in
becomes too high.
Figure
12).
Figure
DS
(see
DS
13) when the switching frequency
generates lowest dV/dt; thus valley
Figure
13). It detects valleys in the
CY8CLEDAC02
SENSE
Page 11 of 20
pin. This
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