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Automotive LED Array Driver
A6269
10
Allegro MicroSystems
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
at2.3V.Thegraphshowsthetemperatureasthesupplyvoltage
increasesfrom14to17V.Withoutthethermalfoldbackfeature
the temperature would continue to increase up to the thermal
shutdown temperature as shown by the dashed line. The solid line
shows the effect of the thermal foldback function in limiting the
temperature rise.
Figures 6 and 7 show the thermal effects where the thermal
resistancefromthesilicontotheambienttemperatureis40°C/W.
Thermal performance can be enhanced further by using a signifi-
cant amount of thermal vias as described below.
Supply Voltage Limits
In many applications, especially in automotive systems, the avail-
able supply voltage can vary over a two-to-one range, or greater
when double battery or load dump conditions are taken into con-
sideration. In such systems is it necessary to design the applica-
tion circuit such that the system meets the required performance
targets over a specified voltage range.
To determine this range when using the A6269 there are two
limiting conditions:
• For maximum supply voltage the limiting factor is the power
that can be dissipated from the regulator without exceeding the
temperature at which the thermal foldback starts to reduce the
output current below an acceptable level.
• For minimum supply voltage the limiting factor is the maximum
drop-out voltage of the regulator, where the difference between
the load voltage and the supply is insufficient for the regulator
to maintain control over the output current.
Minimum Supply Limit: Regulator Saturation Voltage
Thesupplyvoltage,VIN
, is always the sum of the voltage drop
acrossthehigh-sideregulator,VREG , and the forward voltage of
theLEDsinthestring,VLED,asshowninfigure4.
VLED is constant for a given current and does not vary with
supplyvoltage.ThereforeVREG provides the variable difference
betweenVLEDandVIN. V REG has a minimum value below which
the regulator can no longer be guaranteed to maintain the output
current within the specified accuracy. This level is defined as the
regulatordrop-outvoltage,VDO.
The minimum supply voltage, below which the LED current does
not meet the specified accuracy, is therefore determined by the
sumoftheminimumdrop-outvoltage,VDO , and the forward
voltageoftheLEDsinthestring,VLED . The supply voltage must
always be greater than this value and the minimum specified sup-
ply voltage, that is:
VIN > VDO + VLED, and
VIN > VIN
(min) (8)
As an example, consider the configuration used in figures 6 and
7 above, namely 2 strings of 3 red LEDs, each string running at
100mA,witheachLEDforwardvoltageat2.3V.Theminimum
supply voltage will be approximately:
VIN(min) = 0.55 + (3 ×2.3)=7.45V
Maximum Supply Limit: Thermal Limitation As described
above, when the thermal monitor reaches the activation tempera-
ture, TJM (due to increased power dissipation as the supply volt-
age rises), the thermal foldback feature causes the output current
to decrease. The maximum supply voltage is therefore defined as
the voltage above which the LED current drops below the accept-
able minimum.
This can be estimated by determining the maximum power that
can be dissipated before the internal (junction) temperature of the
A6269 reaches TJM.
Note that, if the thermal monitor circuit is disabled (by connect-
ing the THTH pin to GND), then the maximum supply limit will
be the specified maximum continuous operating temperature,
150°C.
The maximum power dissipation is therefore defined as:
PD(max) =RθJA
∆T(max)
(9)
whereΔT(max)isdifferencebetweenthethermalmonitoractiva-
tion temperature, TJM
, of the A6269 and the maximum ambient
temperature, TA(max), and RθJA is the thermal resistance from the
internal junctions in the silicon to the ambient environment.
If minimum LED current is not a critical factor, then the maxi-
mum voltage is simply the absolute maximum specified in the
parameter tables above.