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參數(shù)資料
| 型號(hào)： | LS7232NT |
| 廠商： | LSI Corporation |
| 英文描述： | PROXIMITY/TOUCH CONTROL HALOGEN LAMP DIMMER |
| 中文描述： | 貼近度/觸摸式控制鹵素?zé)粽{(diào)光器 |
| 文件頁(yè)數(shù)： | 2/5頁(yè) |
| 文件大?。?/td> | 48K |
| 代理商： | LS7232NT |
TABLE 1
TOUCH TYPE
SHORT (T
S1
Duration) LONG (T
S2
Duration)
PRE-TOUCH POST-TOUCH PRE-TOUCH POST-TOUCH
Off Max Off Starts varying at Min
Max Off Max Starts varying at Max
Pre-Touch brightness
Off Memory Off Starts varying at
(Note 1) Memory (Note 2)
Max Off Max Starts varying at Max
Intermediate Off Intermediate Starts varying at
Pre-Touch brightness
Off Max Off Starts varying at Min
Max Off Max Starts varying at Max
Pre-Touch brightness
First time after power-up, the Memory value defaults to maximum conduction angle.
NOTE 2:
First time after power-up, LONG touch causes intensity to vary starting at minimum conduction angle.
NOTE 3
: NO = Dimming direction does not reverse from prior dimming direction.
YES = Dimming direction does reverse from prior dimming direction.
N/A = Does not apply
V
DD
(Pin 7)
Supply voltage negative terminal.
TRIG (
Pin 8)
The TRIG output is a low level pulse occurring once every half-
cycle of the SYNC input. The conduction angle, , of the output
in relation to the SYNC signal controls the lamp brightness.
In continuous dimming operation (i.e. when the SENS input is
continuously held low) the TRIG conduction angle, , sweeps up
and down between 41 and 158 continuously. The time vs
curve is not linear (See Figure 4). Between two maxima on this
curve, there are 4 discontinuous points labeled A1, B1, B2, A2.
The discontinuities are as follows:
1. From maximum to A1. In this region, is changed by
equal increments (
) for every 2 SYNC clocks.
2. From A1 to B1. In this region, the increments (
) take
place for every 4 SYNC clocks.
3. From B1 to B2. In this region is held at a constant
level (
= 0).
4. From B2 to A2. Same as 2.
5. From A2 to Max. Same as 1.
The slower rate of change in over A1B1B2A2 region is to
accommodate for eye adjustment at lower light intensity.
The functional differences of the modes of the LS7232ND are explained
in Table 1 and the TRIG output conduction angle diagrams in Figure 4.
MODE
0
(LS72 Intermediate Off Intermediate Starts varying at
1
(LS7232)
2
(LS72 Intermediate Off Intermediate Starts varying at
DIMMING
DIRECTION
REVERSAL
(Note 3)
N/A
N/A
NO
YES
N/A
YES
N/A
N/A
YES
NOTE 1
: "Memory" refers to the conduction angle, , which existed prior to the current off-state.
7232ND-012703-2
OUTPUT
DRIVER
DIGITAL
COMPARATOR
MEMORY
POINTER
PHASE
LOCK
LOOP
CONTROL
LOGIC
BUF
BUF
BUF
SYNC
CAP
MODE
EXT
SENS
V
SS
V
DD
FIGURE 2
LS7232ND BLOCK DIAGRAM
4
3
2
6
5
1
7
TRIG
(+V)
(-V)
8
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