CS1630 Datasheet, PDF (21/56 Pages) Cirrus Logic – 2-Channel TRIAC Dimmable LED Driver IC

CS1630/31
scale output LED current I_LED, as shown in Figure 22.
100%
50%
eOTP Trips and
Shuts Off Lamp
0
25
95
125
Temperature (°C)
Figure 22. eOTP Temperature vs. Impedance
Beyond this temperature, the IC shuts down using the
mechanism discussed above. If the external overtemperature
protection and the temperature compensation for CCT control
features are not required, connect the eOTP pin to GND using
a 50k to 500k resistor to disable the eOTP feature.
5.10 Power Line Calibration
The CS1630/31 integrates power line calibration technology
within the controller to enable calibration and end-of-line
programming without the need for an additional electrical
connection, as shown in Figure 23.
Line
Power Supply
Neutral
LED Lamp
with
CS1630/31
Photodetector
Light
Measurement
The power line calibration uses a phase-cut mechanism for
data generation and return-to-zero data encoding to eliminate
the need for clock synchronization. A code /command can be
created by using the combination of input phase angles, as
detailed in "Power Line Calibration Characteristics" on page 9.
When an initial program mode command has been detected,
the controller will begin to enter calibration mode. After key
parameters of the lighting system have been characterized
and programmed, a burn-in code plus an end-program mode
command is transmitted, instructing the controller to exit the
calibration mode. Power line calibration and end-of-line
programming requires no human intervention. The
CS1630/31 provides registers that allow up to three attempts
for LED output current trimming over power line calibration.
Six registers store the three optional color control system
calibration values for channel 1 color calibration and channel
2 color calibration. For more detail regarding color calibration,
see "Channel 1 Color Calibration 3A (CH1_CAL3A) – Address
119" on page 51 through "Channel 2 Color Calibration 3C
(CH2_CAL3C) – Address 126" on page 53.
5.10.1 Power Line Calibration Specification
To ensure the success of phase detection, the angle for each
bit is specified as shown in "Power Line Calibration
Characteristics" on page 9. The CS1630/31 power line
calibration system operates under universal line voltage and
frequency with a leading-edge, phase-cut waveform.
Light
Calibrator
Figure 23. Power Line Calibration Block Diagram
DS954F2
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