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LS7636 Datasheet(PDF) 2 Page - LSI Computer Systems

Part # LS7636
Description  REVERSE PHASE (TRAILING-EDGE) HALOGEN LAMP DIMMER
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Manufacturer  LSI [LSI Computer Systems]
Direct Link  http://www.lsicsi.com
Logo LSI - LSI Computer Systems

LS7636 Datasheet(HTML) 2 Page - LSI Computer Systems

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TIMING CHARACTERISTICS (See Figures 2, 3 and 4):
PARAMETER
SYMBOL
MIN
TYP MAX
UNIT
CONDITION
SYNC Frequency
fS
40
-
70
Hz
-
SHORT Activation
TS1
50
-
417
ms
60Hz
TS1
60
-
500
ms
50Hz
LONG Activation
TS2
433
-
Infinite ms
60Hz
TS2
520
-
Infinite ms
50Hz
GATE DRIVE pulse width
GDW
2.31
-
7.13
ms
60Hz
(see Note 5)
GDW
2.78
-
8.56
ms
50Hz
Conduction Angle
ø
50
-
154
deg
-
Ø incremental steps
ø
-
1.4
-
deg
-
(Note 1)
Soft-on slew rate
SS
-
1.4
-
deg / 33.3ms 60Hz
SS
-
1.4
-
deg / 40ms
50Hz
A0 to A1/A2 to A0 slew rate
SAA
-
1.4
-
deg / 33.3ms 60Hz
(Note 2)
SBA
-
1.4
-
deg / 40ms
50Hz
A1 to B1/B2 to A2 slew rate
SBA
-
1.4
-
deg / 66.7ms 60Hz
(Note 3)
SBA
-
1.4
-
deg / 80ms
50Hz
B1 to B2 delay
TBD
-
500
-
ms
60Hz
(Note 4)
TBD
-
600
-
ms
50Hz
Note 1: Total number of steps = 77.
Note 2: Number of steps from A0 to A1, or A2 to A0 = 55.
Note 3: Number of steps from A1 to B1 or B2 to A2 = 21.
Note 4: ø is at minimum between B1 and B2. TBD is applicable for LS7636 only.
Note 5: For LS7637 when minimum ø is reached, dimming direction reverses only
if the LONG Activation is terminated and reapplied.
The difference among all versions of
LS7636 and LS7637
are:
LS7636 (LS7636FO)
Upon power-up, the Gate Drive output is Off.
(Upon power-up, the Gate Drive output is On at maximum
conduction angle.) When a LONG Activation is applied,
the dimming direction automatically reverses whenever
maximum or minimum conduction angles are reached.
LS7637 (LS7637FO)
Upon power-up, the Gate Drive is Off.
(Upon power-up, the Gate Drive is On at maximum conduc-
tion angle.) When a LONG Activation is applied, the dim-
ming stops whenever maximum or minimum conduction
angles are reached. In order to change dimming levels
from maximum or minimum, LONG Activation must be re-
moved and reapplied. The purpose of this feature is to al-
low the user to positively locate maximum and minimum
conduction angles.
LS7637 NOTE:
If the User applies a LONG Activation when the
Gate Drive Conduction Angle is within a "few" de-
grees of Maximum or Minimum, the Gate Drive
Conduction Angle can move to Maximum or Mini-
mum and stop without the User being able to ob-
serve a change in brightness. Therefore, the User
should be instructed that if no change in bright-
ness is observed in response to a LONG Activa-
tion, the LONG Activation should be removed and
reapplied in order to produce a change in bright-
ness.
7636-121906-2


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