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LM3530 데이터시트(PDF) 16 Page - Texas Instruments

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부품명 LM3530
상세설명  High-Efficiency White-LED Driver
PDF  50 Pages
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제조업체  TI1 [Texas Instruments]
홈페이지  http://www.ti.com
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LM3530 데이터시트(HTML) 16 Page - Texas Instruments

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Zone Boundary 3
Zone Boundary 2
Zone Boundary 1
Zone Boundary 0
VZB3 +
VHYST
2
VZB3 -
VHYST
2
VZB2 +
VHYST
2
VZB2 -
VHYST
2
VZB1 +
VHYST
2
VZB0+
VHYST
2
VZB0 -
VHYST
2
VZB1 -
VHYST
2
#1
#2
#3
#4
#5
#6
#7
#8
1V
Zone 4
Zone 3
Zone 2
Zone 1
Zone 0
LM3530
SNVS606L – JUNE 2009 – REVISED DECEMBER 2014
www.ti.com
Figure 32. Zone Boundaries With Hysteresis
8.3.8
Minimum Zone Boundary Settings
The actual minimum zone boundary setting is code 0x03. Codes of 0x00, 0x01, and 0x02 are all mapped to code
0x03. Table 1 shows the Zone Boundary codes 0x00 through 0x04, the typical thresholds, and the high and low
hysteresis values. The remapping of codes 0x00 - 0x02 plus the additional 4mV of offset voltage is necessary to
prevent random offsets and noise on the ALS inputs from creating threshold levels that are below GND. This
essentially guarantees that any Zone Boundary threshold selected is achievable with positive ALS voltages.
Table 1. Ideal Zone Boundary Settings with Hysteresis (Lower 5 Codes)
ZONE BOUNDARY CODE
TYPICAL ZONE BOUNDARY
TYPICAL THRESHOLD +
TYPICAL THRESHOLD -
THRESHOLD (mV)
HYSTERESIS (mV)
HYSTERESIS (mV)
0x00
15.8
19.3
12.3
0x01
15.8
19.3
12.3
0x02
15.8
19.3
12.3
0x03
15.8
19.3
12.3
0x04
19.7
23.2
16.2
16
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