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A6265 Datasheet(PDF) 6 Page - Allegro MicroSystems

Part No. A6265
Description  The A6265 is a DC-to-DC converter controller, providing a programmable constant current output for driving high power LEDs in series.
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Maker  ALLEGRO [Allegro MicroSystems]
Homepage  http://www.allegromicro.com
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A6265 Datasheet(HTML) 6 Page - Allegro MicroSystems

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Automotive High Current LED Controller
A6265
6
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
ELECTRICAL CHARACTERISTICS1 (continued) Valid at TJ = –40°C to 150°C, VIN = 8 to 40 V; unless otherwise noted
Characteristics
Symbol
Test Conditions
Min.
Typ.
Max.
Unit
Oscillator (continued)
OSC Watchdog Period
tOSWD
Between successive rising edges
7
μs
CKOUT Output High Voltage
VCOH
IOH = –1 mA
VREG – 1
VREG
V
CKOUT Output Low Voltage
VCOL
IOL = 1 mA
0.4
V
LED Current Sense
Input Bias Current LN (BB mode)3
ILN
LP = LN = VIN
6
μA
Input Bias Current LP (BB mode)3
ILP
LP = LN = VIN
220
μA
Input Bias Current LN (B mode)3
ILN
LP = LN = 0 V
–2
μA
Input Bias Current LP (B mode)3
ILP
LP = LN = 0 V
–25
μA
Differential Input Voltage (Active)
VIDL
EN = High, VIDL = VLP – VLN
100
mV
Differential Input Voltage (PWM off)
VIDLO
EN = Low, VIDL = VLP – VLN
8
mV
Input Common-Mode Range (BB mode)3
VCMLH
VLP = VLN
VIN
–VIN + 1
V
Input Common-Mode Range (B mode)3
VCMLL
VLP = VLN
0
1
V
Current Error
EISL
[(10 × ILED × RSL) – 1] × 100
–5
5
%
Switch Current Sense
Input Bias Current
IBIASS
SP = SN = 0 to 2 V
–30
μA
Maximum Differential Input Voltage4
VIDS
VIDS = VSP – VSN with D = 50%
330
410
490
mV
Input Source Current
IINS
VIDS = 400 mV
400
μA
Input Common-Mode Range
VCMS
VSP = VSN
0
2
V
Diagnostics and Protection
Fault Blank Timer5
tFB
Start-up
3
ms
VREG Undervoltage Turn-Off
VREGUV
Decreasing VREG
4.1
4.3
4.5
V
VREG Undervoltage Hysteresis
VREGUVhys
130
150
160
mV
LED String Short Voltage
VSCL
430
505
580
mV
Non-Reference LED Short Offset
Voltage
VSCO
160
200
240
mV
Reference LED Short Offset Voltage
VSCOR
430
505
580
mV
LED Open Voltage
VOCL
5
5.5
6
V
LF Bias Current (BB mode)3
ILF
LF = LA = VIN + 1.7 V
46
μA
LA Bias Current (BB mode)3
ILA
LF = LA = VIN + 1.7 V
170
μA
LF Bias Current (B mode)3
ILF
LF = 1.7 V
8
μA
LA Bias Current (B mode)3
ILA
LA = 1.7 V
34
μA
LED Undercurrent Voltage Difference6
VUCL
1
mV
Open Fault Time-Out
tOTO
fOSC = 350 kHz
94
ms
Overtemperature Warning Threshold
TJF
Temperature increasing
170
ºC
Overtemperature Hysteresis
TJhys
Recovery = TJF – TJhys
–15–
ºC
1For input and output current specifications, negative current is defined as coming out of (sourcing) the specified device pin.
2Function is correct but parameters are not guaranteed below the general limit (8 V).
3BB mode = buck-boost (supply-referenced) mode, B mode = boost (ground-referenced) mode.
4Parameters guaranteed by design.
5Fault Blank timer not enabled for open-LED condition.
6Undercurrent when VSENSEL < VIDL– VUCL, where VSENSEL is the voltage across the LED current sense resistor RSL.


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