A8500EECTR-T View Datasheet(PDF) - Allegro MicroSystems
Part Name
Description
MFG CO.
'A8500EECTR-T' PDF : 16 Pages View PDF
A8500
Flexible WLED/RGB Backlight Driver
for Medium Size LCDs
ELECTRICAL CHARACTERISTICS (continued), valid at TA = –40°C to 85°C, typical values at TA = 25°C, VIN = 5 V, unless
otherwise noted
Characteristics
Symbol
Test Conditions
Min. Typ. Max. Units
LED Current Sinks
LEDx Regulation Voltage
ISET to ILEDx Current Gain
Voltage on ISET Pin
ISET Allowable Current Range
LEDx Accuracy
VLEDx
AISET
VISET
ISET
ErrLEDx
ISET = 100 µA
RISET = 12 kΩ; 100% current ratio,
measured as average of LED1 to LED8;
LED1 to LED8 = 0.5 V
–
500
–
mV
–
210
–
–
–
1.23
–
V
40
–
150
µA
–
±1.2
–
%
LEDx Matching
∆LEDx
ISET = 100 µA , 100% current ratio;
LED1 to LED8 = 0.5 V
–
±1.5
–
%
LEDx Switch Leakage Current
ILSleak5
VLEDx= 5 V, EN = PWM = APWM = 0, TA = 25°C
–
–
1
μA
LEDx Switch Leakage Current
ILSleak21 VLEDx= 21 V, EN = PWM = APWM=0
–
1
–
μA
Serial Pulse Timing (see figure 4 for further explanation)
EN Pulse Low Time
EN Pulse High Time
Initial EN or APWM Pulse High Time (rela-
tive to switching period)
tLO
tHI
tHI(init)
First EN or APWM pulse after
shutdown
SKIP = Low
SKIP = High
0.5
–
100
μs
0.5
–
100
μs
–
256
–
Switching
Pulses
–
64
–
Switching
Pulses
Level Change Delay (relative to switching
period)
tHID
SKIP = Low
SKIP = High
–
256
–
Switching
Pulses
–
64
–
Switching
Pulses
Shutdown Delay (relative to switching
period on EN or APWM)
tSHDN
Falling edge of EN or APWM
pulse
SKIP = Low
SKIP = High
–
256
–
Switching
Pulses
–
64
–
Switching
Pulses
Soft Start
Soft Start Boost Current Limit
Soft Start LEDx Current Limit
Thermal Shutdown Threshold
ISWSS
ILEDSS
TSHDN
Initial soft start current for boost switch
Current through enabled LEDx pins during soft
start, RISET=12 kΩ
40°C hysteresis
-
1
-
A
-
1.25
-
mA
–
165
–
°C
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
Share Link: 
