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A8500 ๋ฐ์ดํ„ฐ์‹œํŠธ(HTML) 5 Page - Allegro MicroSystems

๋ถ€ํ’ˆ๋ช… A8500
์ƒ์„ธ๋‚ด์šฉ  Flexible WLED/RGB Backlight Driver for Medium Size LCDs
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์ œ์กฐ์‚ฌ  ALLEGRO [Allegro MicroSystems]
ํ™ˆํŽ˜์ด์ง€  http://www.allegromicro.com
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A8500 ๋ฐ์ดํ„ฐ์‹œํŠธ(HTML) 5 Page - Allegro MicroSystems

 
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Flexible WLED/RGB Backlight Driver
for Medium Size LCDs
A8500
5
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
LED Current Sinks
LEDx Regulation Voltage
VLEDx
โ€“
500
โ€“
mV
ISET to ILEDx Current Gain
AISET
ISET = 100 ยตA
โ€“
210
โ€“
โ€“
Voltage on ISET Pin
VISET
โ€“
1.23
โ€“
V
ISET Allowable Current Range
ISET
40
โ€“
150
ยตA
LEDx Accuracy
ErrLEDx
RISET = 12 kโ„ฆ; 100% current ratio,
measured as average of LED1 to LED8;
LED1 to LED8 = 0.5 V
โ€“
ยฑ1.2
โ€“
%
LEDx Matching
โˆ†LEDx
ISET = 100 ยตA , 100% current ratio;
LED1 to LED8 = 0.5 V
โ€“
ยฑ1.5
โ€“
%
LEDx Switch Leakage Current
ILSleak5
VLEDx= 5 V, EN = PWM = APWM = 0, TA = 25ยฐC
โ€“
โ€“
1
ฮผA
LEDx Switch Leakage Current
ILSleak21
VLEDx= 21 V, EN = PWM = APWM=0
โ€“
1
โ€“
ฮผA
Serial Pulse Timing (see figure 4 for further explanation)
EN Pulse Low Time
tLO
0.5
โ€“
100
ฮผs
EN Pulse High Time
tHI
0.5
โ€“
100
ฮผs
Initial EN or APWM Pulse High Time (rela-
tive to switching period)
tHI(init)
First EN or APWM pulse after
shutdown
SKIP = Low
โ€“
256
โ€“
Switching
Pulses
SKIP = High
โ€“
64
โ€“
Switching
Pulses
Level Change Delay (relative to switching
period)
tHID
SKIP = Low
โ€“
256
โ€“
Switching
Pulses
SKIP = High
โ€“
64
โ€“
Switching
Pulses
Shutdown Delay (relative to switching
period on EN or APWM)
tSHDN
Falling edge of EN or APWM
pulse
SKIP = Low
โ€“
256
โ€“
Switching
Pulses
SKIP = High
โ€“
64
โ€“
Switching
Pulses
Soft Start
Soft Start Boost Current Limit
ISWSS
Initial soft start current for boost switch
-
1
-
A
Soft Start LEDx Current Limit
ILEDSS
Current through enabled LEDx pins during soft
start, RISET=12 kฮฉ
-
1.25
-
mA
Thermal Shutdown Threshold
TSHDN
40ยฐC hysteresis
โ€“
165
โ€“
ยฐC
ELECTRICAL CHARACTERISTICS (continued), valid at TA = โ€“40ยฐC to 85ยฐC, typical values at TA = 25ยฐC, VIN = 5 V, unless
otherwise noted
Characteristics
Symbol
Test Conditions
Min.
Typ.
Max.
Units


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