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CS1630 Fiches technique(PDF) 38 Page - Cirrus Logic

No de pièce CS1630
Description  2-Channel TRIAC Dimmable LED Driver IC
PDF  56 Pages
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Fabricant  APEX [Cirrus Logic]
Site Internet  http://www.cirrus.com
Logo APEX - Cirrus Logic

CS1630 Fiches technique(HTML) 38 Page - Cirrus Logic

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CS1630/31
38
DS954F2
6.22 Configuration 17 (Config17) – Address 49
6.23 Configuration 18 (Config18) – Address 50
7
654
32
10
DITHER
RESYNC
T2CH2GAIN5 T2CH2GAIN4 T2CH2GAIN3 T2CH2GAIN2 T2CH2GAIN1 T2CH2GAIN0
Number
Name
Description
[7]
DITHER
Configures dither on the second stage primary side peak current threshold.
0 = Disable dither
1 = Enable dither
[6]
RESYNC
Configures resynchronization of a dual channel second stage design where
the channel synchronization circuit is not directly driven from the SYNC pin. Bit
RESYNC controls the behavior of bits EXIT_PH[3:0] and DECL_PH[3:0] (see
"Configuration 15 (Config15) – Address 47" on page 37).
0 = Disable phase resynchronization
1 = Enable phase resynchronization
[3:0]
T2CH2GAIN[5:0]
Sets T2 compensation gain T2CH2CompGain for channel 2 which is required
when T2 measurement compensation is enabled for flyback designs. The
value is an unsigned integer in the range of 0
T2CH2CompGain<63. Compen-
sated T2 time T2Compensated used in the second stage charge regulation loop
is given by:
where,
T2CH2CompGain is a decimal number the range of 0.0T2CH2CompGain<4.0.
7
654
32
10
LEB3
LEB2
LEB1
LEB0
TEB3
TEB2
TEB1
TEB0
Number
Name
Description
[7:4]
LEB
[3:0]
Configures the leading-edge blanking time TLEB for the second stage peak
current measurement. The output of the current sense comparator which con-
trols the primary side peak current is ignored for time TLEB from the rising
edge of the gate drive signal.
[3:0]
TEB[3:0]
Configures the trailing-edge blanking time TTEB for zero-current detection. The
ZCD comparator output signal used to detect the secondary side inductor
demagnetization is blanked for time TTEB after the falling edge of the second
stage gate drive signal.
T2Compensated T2
=
Measured
TZCD Ri gEdge
sin
 T2CH2CompGain

–
T2CH2CompGain
T2CH2GAIN[5:0] 0.0625
=
TLEB LEB[3:0]
=
250ns

TTEB TEB[3:0]
=
2 50ns




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