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PDF A6260 Data sheet ( Hoja de datos )
| Número de pieza | A6260 | |
| Descripción | High Brightness LED Current Regulator | |
| Fabricantes | Allegro MicroSystems | |
| Logotipo |  |
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A6260
High Brightness LED Current Regulator
Features and Benefits
▪ Automotive grade
▪ LED drive current up to 350 mA
▪ 6 to 40 V supply
▪ Reverse battery protection
▪ Low drop-out voltage
▪ LED short circuit and thermal protection
▪ 10 μA maximum shutdown current
▪ PWM dimming control input
▪ Current slew rate limiting
Package: 8-pin SOIC with exposed
thermal pad (suffix LJ)
Not to scale
Description
The A6260 is a linear, programmable current regulator
providing up to 350 mA for driving high-brightness LEDs.
The LED current, accurate to 4%, is set by a single low-power
sense resistor. Driving LEDs with constant current ensures
safe operation with maximum possible light output.
For automotive applications, optimum performance is
achieved when driving between 1 and 3 LEDs at cur-
rents up to 350 mA.
The low dropout voltage of the A6260 allows a single white
LED to be driven safely, at full current, with a supply voltage
down to 6 V.
An enable input allows PWM dimming and can be used to
enable low-current sleep mode. The rate of change of current
during PWM switching is limited to reduce EMI.
Overcurrent detection is provided to protect the LEDs and
the A6260 during short-to-supply or short-to-ground at any
LED terminal.
The integrated temperature monitor can be used to reduce
the LED drive current if the chip temperature exceeds the
thermal limit.
The device is available in an 8-pin SOIC package with exposed
thermal pad (suffix LJ). The device is lead (Pb) free with 100%
matte-tin leadframe plating.
Typical Application
7 to 20 V
(–14 V min, 40 V max)
Automotive
12 V Power Net
PWM Dimming
and
On-Off Control
VIN
LA
EN
A6260
THTH
LC
LSS
SENSE
GND
6260-DS
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A6260
High Brightness LED Current Regulator
Functional Description
The A6260 is a linear current regulator that is designed to provide
drive current and protection for series-connected, high bright-
ness LEDs in automotive applications. It provides programmable
current output at load voltages up to 3 V below the main supply
voltage. For automotive applications optimum performance is
achieved when driving 1 to 3 LEDs at currents up to 350 mA.
The LED current is set by a single low-power sense resistor and
the LED brightness can be further controlled by a PWM input to
the EN pin. The EN input can also be used as an on/off switched
input and the A6260 will enter a low current (<10 μA) sleep
mode if EN is held low.
For incandescent replacement configurations, the EN input can
be connected directly to the VIN pin with the supply to VIN con-
trolled by a simple on/off switch.
The LEDs and the regulator are protected from excessive currents
caused by short circuits to ground or supply or by reversal of the
power supply connections.
Integrated thermal management circuits can be used to reduce
the regulated current level at high temperatures to limit power
dissipation.
Pin Functions
VIN Pin Supply to the control circuit. A small-value ceramic
bypass capacitor (typically 100 nF) should be connected from
close to this pin to the GND pin.
GND Pin Ground reference connection. Should be connected
directly to the negative supply as close as possible to the bottom
(ground connection) of the sense resistor.
EN Pin Logic input to enable operation. Can be used as a direct
PWM input. Chip enters a low-power sleep mode when this pin is
held low.
THTH Pin Sets the thermal monitor threshold, TJM, where the
output current starts to be reduced with increasing temperature.
When this pin is left open, the threshold temperature will typi-
cally be the specified default value. A resistor connected between
THTH and GND can be used to increase the threshold tempera-
ture. A resistor connected between THTH and VIN can be used to
decrease the threshold temperature. Connecting THTH directly to
GND disables the thermal monitor function.
LA Pin Switched and protected current source connected to the
anode of the LEDs.
LC Pin Controlled current sink connected to the cathode of the
LEDs.
LSS Pin Low-side current sink connection from the current regu-
lator to power ground via a sense resistor. A current sense resistor
(240 mΩ to 3 Ω) is connected between LSS and power ground.
SENSE Pin LED current sense input. The high impedance
SENSE input should have an independent connection to the top
(LSS connection side) of the sense resistor.
LED Current Level
The LED current is controlled by the internal current regulator
between the LC and LSS pins. This current, defined as the current
into the LC pin, ILC, is set by the value, RS, of the sense resis-
tor. The voltage across the sense resistor, measured between the
SENSE pin and the GND pin, is compared to a reference voltage,
nominally 102 mV, allowing the use of a low-value sense resistor
with low power dissipation.
The LED current is thus defined as:
conversely:
ILC = VSENREF / RS
(1)
RS = VSENREF / ILC
The nominal output current settings, ILC, versus the current
setting resistor values, RS, are given in the following table. The
current level defined here is the 100% current level before any
current reduction effects due to the temperature monitor,
described later in this document.
Sense Resistor Selection
ILC
(mA)
RS PD(RS)
(mΩ) (mW)
ILC
(mA)
RS
(mΩ)
PD(RS)
(mW)
350 286 35
125 800
13
300 333 30
100 1000
10
250 400 25
70 1429
7
200 500 20
50 2000
5
150 667 15
35 2857
4
Parallel operation
The A6260 is a constant current controller, that is, it controls the
output current irrespective of output voltage (within the compli-
ance range). This allows the outputs of two or more A6260s to be
connected in parallel (see figure 4e, in the Applications Infor-
mation section). In this configuration, each A6260 must have a
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
5
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