LSI LS7637FO Reverse phase (trailing-edge) halogen lamp dimmer Datasheet

LSI/CSI
UL
®
LS7636 LS7637
LS7636FO LS7637FO
LSI Computer Systems, Inc. 1235 Walt Whitman Road, Melville, NY 11747
(631) 271-0400 FAX (631) 271-0405
A3800
REVERSE PHASE (TRAILING-EDGE) HALOGEN LAMP DIMMER
PIN ASSIGNMENT - TOP VIEW
V DD (+V )
1
2
TEST
3
SYNC
4
LS7636
LS7637
MODE
LSI
FEATURES:
• Pushbutton or touch control of high-voltage lamps and
all electronic transformer-coupled low-voltage
halogen lamps.
• Controls Fluorescents and CFLs via dimming ballasts.
• Reverse-phase technology eliminates RFI generation.
• “FO" versions power up Full On after application of AC.
• Soft turn-on and soft turn-off
• Three operating modes.
• Inputs for direct or remote activation.
• 50Hz/60Hz AC line frequency.
• +12V Power Supply (VDD - VSS).
• LS7636, LS7637 (DIP); LS7636-S, LS7637-S (SOIC);
LS7636FO, LS7637FO (DIP);
LS7636FO-S, LS7637FO-S (SOIC) - See Figure 1 -
June 2009
8
GATE
7
VSS (-V )
6
OVC
5
SENS
FIGURE 1
SENS (Pin 5) - See Table 1
A Logic 0 applied to this input alters the Gate Drive output
APPLICATIONS:
Electronic dimmers for wall-switch control of ceiling mounted either by turning it on, turning it off or by changing its
lighting, foot-switch control of large floor lamps and hand- conduction angle. Specifically which action takes place is
dependent on the type of activation of the SENS input,
switch control of table lamps.
namely SHORT or LONG duration and the prior state of the
Gate Drive output.
BACKGROUND AND GENERAL DESCRIPTION:
Since the operating currents of some electronic transformers
are below the holding current of most triacs, a typical triac- OVC - Overcurrent Sense Input (Pin 6)
based (leading-edge) dimmer may not operate properly when The voltage at this input is sampled every half-cycle in a
driving an electronic transformer-coupled low-voltage halogen four-cycle period. If the voltage reaches the OVC threshold
lamp. The filtering components in the electronic transformer four times, then the Gate Output is turned Off shutting down
which prevent its operating frequency from generating line in- the current through the load. Six cycles after shutdown
terference
can
also
inhibit
triac
triggering.
The occurs, the output is turned On to the previous conduction
LS7636_LS7637 family of reverse-phase dimmer ICs drive angle, the OVC counter is reset and a new four-cycle period
FETs or IGBTs (see Figure 3 and Figure 4) and ‘slowly’ turns begins. The OVC voltage may be generated with a
on current beginning at the AC input zero-crossing. This ‘slow’ fractional-Ohm resistor as shown in Figure 4 and Figure 5.
current turn on is ideal for interfacing with the primary of any When OVC is not being used, Pin 6 must be tied to Pin 7.
electronic transformer and also eliminates the RFI generation
caused by the sudden turn on of current when using a triac- Gate (Pin 8)
The Gate Drive output is a positive-going pulse that initiates
based dimmer.
at every zero-crossing of the AC input. The width of the
Gate
Drive signal determines the conduction angle as
INPUT/OUTPUT DESCRIPTION:
shown in Figure 2.
VDD (Pin 1) Supply voltage positive terminal.
Test (Pin 3)
For factory use only.
VSS (Pin 7) Supply voltage negative terminal.
MODE (Pin 2) - See Table 1
All variations of LS7636 and LS7637 can operate in 3 different
modes. The 3-state MODE input selects the operating modes:
VSS = Mode 0; Float = Mode 1; VDD = Mode 2
SYNC (Pin 4) - See Figure 2
The AC line frequency is applied to this input.
All internal timings are synchronized to the AC.
7636-061009-1
The information included herein is believed to be
accurate and reliable. However, LSI Computer Systems,
Inc. assumes no responsibilities for inaccuracies, nor for
any infringements of patent rights of others which may
result from its use.
TIMING CHARACTERISTICS (See Figures 2, 3 and 4):
PARAMETER
SYMBOL
MIN
SYNC Frequency
SHORT Activation
LONG Activation
GATE DRIVE pulse width
(see Note 5)
Conduction Angle
Ø incremental steps
(Note 1)
Soft-on slew rate
A0 to A1/A2 to A0 slew rate
(Note 2)
A1 to B1/B2 to A2 slew rate
(Note 3)
B1 to B2 delay
(Note 4)
Note 1:
Note 2:
Note 3:
Note 4:
Note 5:
MAX
UNIT
CONDITION
fS
TS1
TS1
TS2
TS2
GDW
GDW
ø
∆ø
40
50
60
433
520
2.31
2.78
50
-
1.4
70
Hz
417
ms
500
ms
Infinite ms
Infinite ms
7.13
ms
8.56
ms
154
deg
deg
60Hz
50Hz
60Hz
50Hz
60Hz
50Hz
-
SS
SS
SAA
SBA
SBA
SBA
TBD
TBD
-
1.4
1.4
1.4
1.4
1.4
1.4
500
600
-
60Hz
50Hz
60Hz
50Hz
60Hz
50Hz
60Hz
50Hz
deg / 33.3ms
deg / 40ms
deg / 33.3ms
deg / 40ms
deg / 66.7ms
deg / 80ms
ms
ms
Total number of steps = 77.
Number of steps from A0 to A1, or A2 to A0 = 55.
Number of steps from A1 to B1 or B2 to A2 = 21.
ø is at minimum between B1 and B2. TBD is applicable for LS7636 only.
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 conduction angle.) When a LONG Activation is applied, the dimming stops whenever maximum or minimum conduction
angles are reached. In order to change dimming levels
from maximum or minimum, LONG Activation must be removed and reapplied. The purpose of this feature is to allow the user to positively locate maximum and minimum
conduction angles.
7636-121906-2
TYP
LS7637 NOTE:
If the User applies a LONG Activation when the
Gate Drive Conduction Angle is within a "few" degrees of Maximum or Minimum, the Gate Drive
Conduction Angle can move to Maximum or Minimum and stop without the User being able to observe a change in brightness. Therefore, the User
should be instructed that if no change in brightness is observed in response to a LONG Activation, the LONG Activation should be removed and
reapplied in order to produce a change in brightness.
TABLE 1
MODE
SHORT-ACTIVATION
PRE-ACTIVATION
Ø
LONG-ACTIVATION
POST-ACTIVATION
Ø
PRE-ACTIVATION
Ø
DIMMING
REVERSAL
(Note 5)
POST-ACTIVATION
Ø
0
OFF
ON
MAX (Note 1)
OFF (Note 4)
OFF/MIN
MAX
INTERMEDIATE
Varies up from MIN
Varies down from MAX
Varies from INTERMEDIATE
N/A
N/A
NO
1
OFF
ON
MEMORY (Notes 2, 3)
OFF (Note 4)
OFF/MIN
MAX
INTERMEDIATE
Varies up from MIN
Varies down from MAX
Varies from INTERMEDIATE
N/A
N/A
YES
2
OFF
ON
MAX (Note 1)
OFF (Note 4)
OFF/MIN
MAX
INTERMEDIATE
Varies up from MIN
Varies down from MAX
Varies from INTERMEDIATE
N/A
N/A
YES
Note 1: A soft turn-on is produced by slewing up the conduction angle, ø, from minimum at the rate of 1.4O / 33.3ms (60Hz).
Note 2: A soft turn-on is produced by slewing up ø, from minimum to memory.
Upon power-up the memory value is defaulted to maximum conduction angle.
Note 3: “Memory” refers to the conduction angle, ø, which existed prior to the current off-state.
Note 4: A soft turn-off is produced by slewing down ø from the existing conduction angle to off at the rate of 1.4O / 33.3ms (60Hz).
Note 5: NO = Dimming direction does not reverse from prior dimming direction.
YES = Dimming direction does reverse from prior dimming direction. N/A = Does not apply.
ABSOLUTE MAXIMUM RATINGS:
PARAMETER
DC supply voltage
Any input voltage
Operating temperature
Storage temperature
SYMBOL
VDD - VSS
VIN
TA
TSTG
VALUE
+16
VSS - 0.3 to VDD + 0.3
0 to +90
-65 to +150
UNIT
V
V
°C
°C
DC ELECTRICAL CHARACTERISTICS:
(TA = +25°C, all voltages referenced to VSS. VDD = +12V unless otherwise noted.)
PARAMETER
SYMBOL
MIN
TYP
MAX
UNIT
Supply voltage
Supply current
VDD
IDD
10
-
12
0.8
15
1
V
mA
SYNC Lo
VISL
-
-
5.7
V
SYNC Hi
VISH
6.4
-
-
V
-
SENS Lo
VIEL
-
-
4.5
V
-
SENS Hi
VIEH
7.7
-
-
V
-
GATE DRIVE
Source Current
Sink Current
IGSR
IGSN
4
4
-
-
mA
mA
VOH = 11.5V
VOL = 0.5V
--
0.35
-
V
-
OVC
7636-063008-3
CONDITION
Output unloaded
VDD = +12V
-
sync
Φ
Φ
Gate
FIGURE 2. Gate Conduction Angle, Φ
ts1
ts2
short
sens
A0
short
Φ 150
mode2 100
50
off
A1 B1 B2 A2
reversal
A1 B1 B2 A2
reversal
memory
short
short
long
LS7636
no memory
A0
Φ 150
mode2 100
50
off
Φ 150
mode1 100
50
off
no memory
no reversal
A1 B1 B2 A2
Φ 150
mode1 100
50
off
Φ 150
mode0 100
50
off
short
long
A0
Φ 150
mode0 100
50
off
sens
short
long
long
long
short
long
no memory
no reversal
reversal
memory
reversal
FIGURE 3. Gate Conduction Angle, Φ vs Sens
no memory
LS7637
EXT
SWITCH
V DD
R2
+
C1
D1
R10
Q1
D2
1
D3
Q3
D4
R1
P
2
3
D5
R9
U3
1
2
R3
3
4
C2
V DD
GATE
MODE
V SS
TEST
OVC
SYNC
SENS/
8
7
R5
6
5
C4
LS7636
R4
3
2
R6
SENSE C3
SWITCH
Q2
3
1
2
1
4
Q4
R7
R8
TRANSFORMER
LOAD
N
FIGURE 4. Reverse Phase Dimmer (Option 1)
C1 = 100uF
C2 = 0.0047uF
C3 = 0.047uF
C4 = 0.1uF
R1 = 150kΩ
* R1 = 270kΩ, 1/2W
R2 = 390Ω
R3 = 39kΩ
R4 = 1.5MΩ
R5 = 10kΩ
7636-041709-5
R6 = 150kΩ
D4 = 1N4004
* R6 = 270kΩ
D5 = 1N4004
R7 = 47kΩ
Q1 = MJE340 (or equivalent)
* R7 = 91kΩ
Q2 = Liteon LTV354T (or equivalent)
R8 = 47kΩ
Q3 = IRF630 (Typical)
* R8 = 91kΩ
* Q3 = IRF730 (Typical)
R9 = 0.25Ω, 1W (For 1 Amp RMS Max)
Q4 = IRF630 (Typical)
* Q4 = IRF730 (Typical)
R10 = 4.3kΩ, 1/2W
D1 = 12V, 1/2W, 5%
D2 = 5.6V, 1/4W, 10%
All Resistors 1/4W, All Capacitors 25V unless otherwise specified
D3 = 1N4004
* = Component change for 220VAC
P
V DD
R2
+
C1
D1
D5
R10
Q1
D4
D2
+
R1
U3
1
2
R3
GATE
V DD
3
4
C2
MODE
V SS
TEST
OVC
SYNC
SENS/
8
7
Q3
EXT
SWITCH
3
R8
6
5
2
1
C4
R9
LS7636
R4
3
-
R5
2
SENSE
SWITCH
D3
C3
1
4
Q2
R6
R7
TRANSFORMER
LOAD
N
FIGURE 5. Reverse Phase Dimmer (Option 2)
C1 = 100uF
C2 = 0.0047uF
C3 = 0.047uF
C4 = 0.1uF
R1 = 150kΩ
* R1 = 270kΩ, 1/2W
R2 = 390Ω
R3 = 39kΩ
R4 = 1.5MΩ
R5 = 150kΩ
7636-041709-6
R6 = 47kΩ
D3 = 1N4004
* R6 = 91kΩ
D4 = 1N4004
R7 = 47kΩ
D5 = DF02
* D5 = DF04
* R7 = 91kΩ
R8 = 10kΩ
Q1 = MJE340 (or equivalent)
R9 = 0.25Ω, 1W (For 1 Amp RMS Max)
Q2 = Liteon LTV354T (or equivalent)
R10 = 4.3kΩ, 1/2W
Q3 = IRF630 (Typical)
* Q3 = IRF730 (Typical)
D1 = 12V, 1/2W, 5%
D2 = 5.6V, 1/4W, 10%
All Resistors 1/4W, All Capacitors 25V unless otherwise specified
* = Component change for 220VAC
V DD
D1
TO SENS, PIN 5
TOUCH
OUTPUT
R1
Q1
Q2
R3
R2
TOUCH
PLATE
R1 = 1M D1 = 1N4148
R2 = 1M Q1 = MPS8599
R3 = 220k Q2 = MPS8099
R4 = 100k
R5 = 510k
R4
R5
All Resistors 1/4W
FIGURE 6. Application Circuit For Touch Control Operation
The Application Circuit shown in Figure 6 can be applied to the Reverse Dimmer circuits shown in Figure 4 (Option 1) and Figure 5 (Option 2). The Touch Output is connected to the SENSE input (Pin 5) of LS7636. When using the circuit shown in Figure
6, the following components must be removed in Figure 4 and Figure 5:
Figure 4 - Remove R6, D5, EXT SWITCH and SENSE SWITCH. C3 remains.
Figure 5 - Remove R5, D3, EXT SWITCH and SENSE SWITCH. C3 remains.
7636-041809-7
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