A8501GLPTR-T データシートの表示（PDF） - Allegro MicroSystems
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A8501GLPTR-T Datasheet PDF : 24 Pages
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A8501
2 MHz, 4 Channel×100 mA WLED/RGB Driver
with Output Disconnect
ELECTRICAL CHARACTERISTICS (continued) Valid using circuit shown in figure 1; VIN = 12 V, EN = SEL1 = SEL2 =5 V, RISET = 12.4 kΩ,
RFSET = 24.3 kΩ, VTO shorted to VTI, guaranteed over the full operating temperature range with TA =TJ , typical specifications are at
TA = 25ºC; unless otherwise noted
Characteristics
Symbol
Test Conditions
Min.
Typ.
Max.
Unit
LEDx Accuracy1
RISET = 12.4 kΩ. 100% current ratio, measured
ErrLED as the average of VLEDx , for LED1 through
–
0.7
3
%
LED4, with VLEDx = 0.75 V, TA =TJ = 0 to 125°C
LEDx Matching2
∆LEDx
IISET = 100 μA, 100% current ratio, with
VLEDx = 0.75 V
–
0.8
3
%
LED Switch Leakage Current
IS(lkg) VLEDx = 17.5 V, EN = VIL = 0 V
4.8
8.75
12.8
μA
LEDx Short Detect Voltage Threshold
VLEDSC On any LEDx pin, forces latched shutdown
17.5
19
21
V
Output Disconnect Switch
On-Resistance
RODS(on) VIN = 8 V, IOUT = 400 mA, TJ = 125°C
–
2
4
Ω
Oscillator
FSET Pin Voltage
Frequency
Minimum Switch Off-Time
Minimum Switch On-Time
Soft Start
VFSET
fOSC
toff(min)
ton(min)
RFSET = 24.3 kΩ
RFSET = 24.3 kΩ
RFSET = 51.1 kΩ
RFSET = 84.5 kΩ
1.14
1.8
0.850
0.5
–
–
1.235
2.1
1
0.6
60
60
1.33
2.4
1.285
0.8
110
110
V
MHz
MHz
MHz
ns
ns
Soft Start Boost Current Limit
Soft Start LEDx Current
PWM Timing on EN pin
ISWSS(lim) Initial soft start current for boost switch
0.4
0.6
0.75
A
ILEDSS
Current through each enabled LEDx pin during
soft start, RISET =12.4 kΩ
3
5
10
mA
Maximum PWM Dimming Off-Time
tPWML
Measured while EN = low, during dimming
control, and internal references are powered on
(exceeding tPWML results in shutdown)
–
131,072
–
fSW cycles
Minimum PWM On-Time
tPWMH
–
–
6
μs
PWM High to LED On Delay
Time between PWM enable and when LED
tdPWM(on) current reaches 90% of maximum, with internal
–
3
–
μs
references enabled and tPWML not exceeded
PWM Low to LED Off Delay
Time between EN going low and when LED
tdPWM(off) current reaches 10% of maximum, with internal
–
0.5
–
μs
references enabled and tPWML not exceeded
Thermal Shutdown Threshold3
TTSD Device temperature rising
150
172
195
°C
Thermal Shutdown Hysteresis3
TTSD(hys)
15
20
25
°C
1LED accuracy is defined as (IISET × 960 – ILED(av)) / (IISET × 960), ILED(av) measured as the average of ILED1 through ILED4.
2LED current matching is defined as (ILEDx – ILED(av)) / ILED(av), with ILED(av) as defined in footnote 1.
3Guaranteed by design and characterization, functional tested in production.
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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