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A6262 데이터시트 PDF




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부품번호 A6262 기능
기능 Automotive LED Array Driver
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A6262 데이터시트, 핀배열, 회로
www.DataSheet.co.kr
A6262
Automotive LED Array Driver
Features and Benefits
Total LED drive current up to 400 mA
Current shared equally up to 100 mA by up to 4 strings
6 to 50 V supply
Low dropout voltage
LED output short-to-ground and thermal protection
On/off toggle switch input
Enable input for PWM control
Current slew rate limit during PWM
Current set by reference resistor
Automotive K-temperature range version (–40°C to 150°C):
contact factory for availability
Applications:
Dome light, map light, space lighting,
mood lighting
Packages
10-pin MSOP with
exposed thermal pad
(suffix LY)
16-pin TSSOP with
exposed thermal pad
(suffix LP)
Not to scale
Description
TheA6262 is a linear, programmable current regulator providing
up to 100 mA from each of four outputs to drive arrays of high
brightness LEDs. The regulated LED current from each output,
accurate to 5%, is set by a single reference resistor. Current
matching in each string is better than 10% without the use of
ballast resistors. Driving LEDs with constant current ensures
safe operation with maximum possible light output.
Output control is provided by an enable input, giving direct
control for PWM applications, and by a debounced switch
input, proving an on/off toggle action.
For automotive applications, optimum performance is achieved
when driving 4 strings with 1 to 3 LEDs in each string, at a
total current of up to 100 mA in each string. Outputs can be
connected in parallel or left unused as required.
Short detection is provided to protect the LEDs and the A6262
during a short-to-ground at any LED output pin. The output
will automatically resume the regulated current when the short
is removed.
A temperature monitor is included to reduce the LED drive
current if the chip temperature exceeds an adjustable thermal
threshold.
The device packages are a 10-pin MSOP (LY) and a 16-pin
TSSOP (LP), both with exposed pad for enhanced thermal
dissipation. They are lead (Pb) free, with 100% matte tin
leadframe plating.
Typical Application Diagram
+
Automotive
12 V power net
PWM dimming
input from LCU
On/Off
VIN
A6262
EN
SW
IREF
THTH
LA1
LA2
LA3
LA4
GND
A6262-DS
Datasheet pdf - http://www.DataSheet4U.net/




A6262 pdf, 반도체, 판매, 대치품
www.DataSheet.co.kr
A6262
Automotive LED Array Driver
ELECTRICAL CHARACTERISTICS1 Valid at TJ = –40°C to 150°C, VIN = 7 to 40 ; unless otherwise noted
Characteristics
Symbol
Test Conditions
Min.
Typ.
Supply and Reference
VIN Functional Operating Range2
VIN Quiescent Current
VIN Sleep Current
Startup Time
Current Regulation
Reference Voltage
Reference Current Ratio
Current Accuracy3
Current Matching4
IINQ LA[1:4] connected to VIN
IINS EN = GND
tON VIN > 7 V to ILA1 < –5 mA, RREF = 125 Ω
VIREF
GH
EILAx
EIMLAx
0.7 mA < IREF < 8.8 mA
ILAx / IREF
–10 mA > ILAx > –100 mA
–20 mA > ILAx > –100 mA, VLAx match to
within 1 V
6–
––
––
5 15
1.15 1.2
– 12.5
–5 ±4
–5
Output Current, High Level
Maximum Output Current
Minimum Drop-out Voltage
Current Slew Time
ILAx
ILAxmax
VDO
EN = high
IREF = 8 mA, EN = high
IREF = 9.2 mA, EN = high
VIN – VLAx , ILAx = –100 mA
VIN – VLAx , ILAx = –40 mA
Current rising or falling between 10% and 90%
–105
50
GH ×
IREF
–100
80
Logic Inputs EN and SW
Input Low Voltage
Input High Voltage
Input Hysteresis (EN pin)
Pull-Down Resistor (EN pin)
Pull-Up Current (SW pin)
SW Input Debounce Time
VIL
VIH
VIhys
RPD
IPU
tSW
––
2–
150 350
– 50
– 100
10 –
Protection
Short Detect Voltage
Short Circuit Source Current
Short Release Voltage
Short Release Voltage Hysteresis
Thermal Monitor Activation Temperature
Thermal Monitor Slope
Thermal Monitor Low Current
Temperature
VSCD
ISCS
VSCR
VSChys
TJM
dISEN/dTJ
TJL
Measured at LAx
Short present LAx to GND
Measured at LAx
VSCR – VSCD
TJ with ISEN = 90%, THTH open
ISEN = 50%, THTH open
TJ at ISEN = 25%, THTH open
1.2 –
–2 –0.8
––
200 –
95 115
–3.5 –2.5
120 135
Overtemperature Shutdown
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 outside the general limits (7 to 40 V).
3When EN = high, EILAx = 100 × [( | ILAx | × RREF / 15 ) –1], with ILAx in mA and RREF in kΩ.
4EIMLA = 100 × [ max ( | ILAx– ILA(AV) | ) / ILA(AV) ] , where ILA(AV) is the average current of all active outputs.
Max.
50
10
15
30
1.25
5
10
–95
–110
800
550
110
0.8
50
1.8
–0.5
1.9
500
130
–1.5
150
Unit
V
mA
μA
μs
V
%
%
mA
mA
mV
mV
μs
V
V
mV
kΩ
μA
ms
V
mA
V
mV
°C
%/°C
°C
°C
°C
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
4
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A6262 전자부품, 판매, 대치품
www.DataSheet.co.kr
A6262
Automotive LED Array Driver
As the junction temperature of the A6262 increases, the regulated
current level is reduced, reducing the dissipated power in the
A6262 and in the LEDs. The current is reduced from the 100%
level at typically 4% per degree Celsius until the point at which
the current drops to 25% of the full value, defined at TJL. Above
this temperature the current will continue to reduce at a lower
rate until the temperature reaches the overtemperature shutdown
threshold temperature, TJF.
The temperature at which the current reduction begins can be
adjusted by changing the voltage on the THTH pin. When THTH
is left open the temperature at which the current reduction begins
is defined as the thermal monitor activation temperature, TJM, and
is specified, in the characteristics table, at the 90% current level.
TJM will increase as the voltage at the THTH pin, VTHTH , is
reduced and is defined as approximately:
TJM
= 1.46 –VTHTH
0.0039
(°C)
(3)
A resistor connected between THTH and GND will reduce VTHTII
and increase TJM. A resistor connected between THTH and a refer-
ence supply greater than 1 V will increase VTHTH and reduce TJM.
Figure 3 shows how the nominal value of the thermal monitor
activation temperature varies with the voltage at THTH and with
either a pull-down resistor, RTH, to GND or with a pull-up resis-
tor, RTH, to 3 V and to 5 V.
In extreme cases, if the chip temperature exceeds the overtem-
perature limit, TJF, all regulators will be disabled. The tempera-
ture will continue to be monitored and the regulators re-activated
when the temperature drops below the threshold provided by the
specified hysteresis.
Note that it is possible for the A6262 to transition rapidly
between thermal shutdown and normal operation. This can hap-
pen if the thermal mass attached to the exposed thermal pad is
small and TJM is increased to close to the shutdown temperature.
The period of oscillation will depend on TJM, the dissipated
power, the thermal mass of any heatsink present, and the ambient
temperature.
100
90
80
60
40
25
20
0
70
TJM
TJL
90 110 130
Junction Temperature, TJ (°C)
TJF
150 170
Figure 2. Temperature monitor current reduction.
250 1.3
200
150
100
50
0
70
RTH
pull-up
to 5 V
VTHTH
1.2
tRoTGH NpuDll-down
1.1
1.0
RtoT3H
pull-up
V
80 90 100 110 120 130 140
Thermal Monitor Activation Temperature, TJM (°C)
0.9
0.8
150
Figure 3. TJM versus a pull-up or pull-down resistor, RTH, and VTHTH.
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
7
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