A8516 Просмотр технического описания (PDF) - Allegro MicroSystems
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A8516 Datasheet PDF : 17 Pages
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A8516
LED Backlight Driver for LCD Monitors and Televisions
ELECTRICAL CHARACTERISTICS (continued) Valid at VIN = 12 V; TA = 25°C, RFSET = 52 kΩ, RISET = 12.4 kΩ, except
indicates specifications guaranteed over the full operating temperature range with TA = TJ , unless otherwise noted
Characteristics
Symbol
Test Conditions
Min. Typ.1 Max. Unit
LED Current Sinks (continued)
LEDx Accuracy3
LEDx Matching4
LEDx Switch Leakage Current2
LEDx Bleeder Resistor to GND
Soft Start
ErrILEDX
ΔILEDX
ISL
RLEDX
LED1 through LED6 = 1.0 V, at 100% Current
LED1 through LED6 = 1.0 V, ISET = 100 μA
VLEDx = 12 V, EN = 0
PWM = Low, VLEDx = 10 V
–3 ±0.6 3
%
–3 ±0.6 3
%
–
48
–
μA
– 250 –
kΩ
Soft Start Sense Threshold Voltage
VSENS
Sense voltage for boost switch current
sensing
– 28.5 – mV
Soft Start LEDx Current Limit Relative to LED
100% Current
ILED(SS)
Current through enabled LEDx pins during
soft start
–
8
–
%
Protection Features
Thermal Shutdown Threshold
TTSD
TJ rising
– 165 –
°C
Short Circuit Detect Voltage
VSC
Measured on any LEDx pin
–
25
–
V
Output Overvoltage Threshold
VOVP
ROVP = 0
18.0 19.5 21.0 V
OVP Pin Leakage Current2
IOVPLK
VOVP = 22 V, EN = VIL, or PWM=VIL
–
0.1
–
μA
Overvoltage Protection Sense Current2
IOVPH
183 200 217 μA
¯F¯¯A¯¯U¯¯L¯¯T¯ Pin Output Leakage2
IFLT
V=5V
–
–
1
μA
¯F¯¯A¯¯U¯¯L¯¯T¯ Pin Output Voltage
VOL
I = 500 μA
–
– 0.4 V
1Typical specifications are at TA = 25ºC.
2For input and output current specifications, negative current is defined as coming out of the node or pin (sourcing), positive current is defined as going
into the node or pin (sinking).
3LED accuracy is defined as (ISET × 640 – ILED(av)) / (ISET × 640), ILED(av) measured as the average of ILED1 through ILED6. Refer to characterization
chart for variation over temperature range.
4LED current matching is defined as (ILEDx – ILED(av)) / ILED(av), with ILED(av) as defined in footnote 3. Refer to characterization chart for variation over
temperature range.
5Guaranteed by design and characterization.
Variation of Total LED Current versus Ambient Temperature
100% Current = 64 mA per channel at 25°C
101.0
100.5
100.0
99.5
99.0
98.5
98.0
-60 -40 -20 0 20 40 60
Temperature, TA (°C)
80 100
Allegro MicroSystems, Inc.
6
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
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