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A6267 の電気的特性と機能

A6267のメーカーはAllegroです、この部品の機能は「Automotive High Current LED Controller」です。


製品の詳細 ( Datasheet PDF )

部品番号 A6267
部品説明 Automotive High Current LED Controller
メーカ Allegro
ロゴ Allegro ロゴ 




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A6267 Datasheet, A6267 PDF,ピン配置, 機能
A6267
Automotive High Current LED Controller
Features and Benefits
AEC Q100 Grade 0 Automotive Qualified
Constant current LED drive
6.5 to 50 V supply
Boost or buck-boost modes
Drives up to 15 LEDs in series
Programmable switching frequency 100 to 700 kHz
Open LED overvoltage indication and protection
Single and multiple LED short indication
LED short to ground and supply protection
PWM dimming control
10 μA shutdown current including LED leakage
Applications:
Automotive high power LED lighting systems
Fog lights, reversing lights, daytime running lights
Headlights
Package: 16-pin TSSOP with exposed
thermal pad (suffix LP)
Not to scale
Description
The A6267 is a DC-to-DC converter controller, providing a
programmable constant current output for driving high power
LEDs in series. Driving the LEDs in series ensures identical
currents and uniform brightness. For automotive applications,
optimum performance is achieved when driving up to 15 LEDs
at currents up to 1 A.
TheA6267 provides a cost-effective solution using an external
logic-level MOSFET and minimum additional external
components. The maximum LED current is set with a single
external sense resistor and can be modified using a current
reference input. Direct PWM control is possible via the Enable
input, which also provides a shutdown mode.
This DC-DC converter can be configured as a ground-referenced
boost converter or as a supply-referenced boost converter
providing buck-boost capability.The buck-boost topology used
ensures that there is no leakage path through the LEDs when
in shutdown and no inrush current at power-up.
Integrated diagnostics and two fault outputs give indication of
undervoltage, chip overtemperature, output open circuit, LED
short circuit and LED undercurrent, and can be configured to
provide short to supply and short to ground protection for the
LED connections. A unique feature is the ability to detect one
or more shorted LEDs.
The device is provided in a 16-pinTSSOPpackage with exposed
thermal pad (suffix LP). It is lead (Pb) free, with 100% matte
tin leadframe plating.
Typical Application Diagrams
VBAT 12 V or 24 V (50 V max)
Power net
Buck Boost Mode
VBAT(min)
(V)
Maximum
Quantity of
LEDs
7 10
8 11
9 13
Vf of each LED = 3.5 V,
D(max) = 85%
Fault
Flags
Enable
VIN
VREG
FF1
FF2
A6267
LN
LP
LF
EN
SG
IREF
CKOUT
SP
OSC
SN
GND LA
VBAT 12 V or 24 V (50 V max)
Power net
Boost Mode
VBAT(min)
(V)
Maximum
Quantity of
LEDs
7 12
8 13
9 15
Vf of each LED = 3.5 V,
D(max) = 85%
Fault
Flags
Enable
VIN
VREG
LN
LP
FF1
FF2
A6267 LF
EN
SG
IREF
CKOUT
SP
OSC
GND
SN
LA
Buck-Boost Mode
(Supply-referenced boost)
A6267-DS, Rev. 3
Boost Mode
Free Datasheet http://www.datasheet4u.com/

1 Page





A6267 pdf, ピン配列
A6267
Automotive High Current LED Controller
Pin-out Diagram
EN 1
FF1 2
FF2 3
CKOUT 4
IREF 5
OSC 6
SN 7
SP 8
PAD
16 LF
15 LA
14 LN
13 LP
12 VIN
11 VREG
10 GND
9 SG
Terminal List Table
Number
Name
1 EN
2 FF1
3 FF2
4 CKOUT
5 IREF
6 OSC
7 SN
8 SP
9 SG
10 GND
11 VREG
12 VIN
13 LP
14 LN
15 LA
16 LF
– PAD
Function
Enable chip
Fault flag
Fault flag
Oscillator output, with phase shift
Current reference
Oscillator input/frequency set
Switch current sense –ve input
Switch current sense +ve input
Switch gate drive
Ground
Internal regulator capacitor
Main supply
Load current sense +ve input
Load current sense –ve input
LED string voltage sense
Reference LED voltage sense
Exposed thermal pad
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
3
Free Datasheet http://www.datasheet4u.com/


3Pages


A6267 電子部品, 半導体
A6267
Automotive High Current LED Controller
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.
Oscillator (continued)
OSC Watchdog Period
CKOUT Output High Voltage
CKOUT Output Low Voltage
LED Current Sense
tOSWD
VCOH
VCOL
Between successive rising edges
IOH = –1 mA
IOL = 1 mA
7
VREG – 1
VREG
0.4
Input Bias Current LN (BB mode)3
Input Bias Current LP (BB mode)3
Input Bias Current LN (B mode)3
Input Bias Current LP (B mode)3
Differential Input Voltage (Active)
Input Common-Mode Range (BB mode)3
Input Common-Mode Range (B mode)3
Current Error
Switch Current Sense
ILN
ILP
ILN
ILP
VIDL
VCMLH
VCMLL
EISL
LP = LN = VIN
LP = LN = VIN
LP = LN = 0 V
LP = LN = 0 V
EN = High, VIDL = VLP – VLN
VLP = VLN
VLP = VLN
[(10 × ILED × RSL) – 1] × 100
–6–
– 220 –
– –2 –
– –25 –
– 100 –
VIN – VIN + 1
0– 1
–5 –
5
Input Bias Current
Maximum Differential Input Voltage4
Input Source Current
Input Common-Mode Range
Diagnostics and Protection
IBIASS
VIDS
IINS
VCMS
SP = SN = 0 to 2 V
VIDS = VSP – VSN with D = 50%
VIDS = 120 mV
VSP = VSN
–30 –
110 145 180
– 120 –
0– 2
Fault Blank Timer5
VREG Undervoltage Turn-Off
VREG Undervoltage Hysteresis
LED String Short Voltage
Non-Reference LED Short Offset
Voltage
tFB
VREGUV
VREGUVhys
VSCL
Start-up
Decreasing VREG
VSCO
–3–
4.1 4.3 4.5
130 150 160
430 505 580
160 200 240
Reference LED Short Offset Voltage
VSCOR
430 505
LED Open Voltage
VOCL
5 5.5
LF Bias Current (BB mode)3
ILF LF = LA = VIN + 1.7 V
– 46
LA Bias Current (BB mode)3
ILA LF = LA = VIN + 1.7 V
– 170
LF Bias Current (B mode)3
ILF LF = 1.7 V
–8
LA Bias Current (B mode)3
ILA LA = 1.7 V
– 34
LED Undercurrent Voltage Difference6
VUCL
–1
Open Fault Time-Out
tOTO
fOSC = 350 kHz
– 94
Overtemperature Warning Threshold
TJF Temperature increasing
– 170
Overtemperature Hysteresis
TJhys
Recovery = TJF – TJhys
– 15
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.
580
6
Unit
μs
V
V
μA
μA
μA
μA
mV
V
V
%
μA
mV
μA
V
ms
V
mV
mV
mV
mV
V
μA
μA
μA
μA
mV
ms
ºC
ºC
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
6
Free Datasheet http://www.datasheet4u.com/

6 Page



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