A6260
Selection Guide
Part Number
A6260KLJTR-T
3000 pieces per reel
THERMAL CHARACTERISTICS may require derating at maximum conditions
Characteristic
Symbol Test Conditions*
Value Units Package Thermal Resistance
R θJA 4-layer PCB based on JEDEC standard
35ºC/W 2-layer PCB with 0.8 in.2 of copper area each side
62ºC/W R θJP
2
*Additional thermal information available on Allegro website.
Absolute Maximum Ratings*
Characteristic
Symbol Notes
Rating Units Load Supply Voltage V IN –14 to 40V EN Pin Voltage V EN –14 to 40V LA and LC Pins Voltage V Lx –0.3 to 40V LSS Pin Voltage V LSS –0.3 to 0.3V SENSE Pin Voltage V SENSE –0.3 to 0.3V THTH Pin Voltage
V THTH –0.3 to 7V Ambient Operating Temperature Range T A Range K
–40 to 125ºC Junction Operating Temperature Range T J –40 to 150ºC Storage Temperature Range T stg
–55 to 150ºC ESD Rating, Human Body Model AEC-Q100-002, all pins 2000V ESD Rating, Charged Device Model AEC-Q100-011, all pins 1050
V
*With respect to GND.
Functional Block Diagram
Terminal List Table
Number
Name Description
1SENSE Current sense input 2GND Ground reference 3THTH Thermal threshold input 4EN Enable input 5VIN Main supply
6LA LED anode (+) connection 7LC LED cathode (-) connection 8
LSS
Low-side sense connection
SENSE GND THTH EN
Pin-out Diagram
Characteristics Symbol Test Conditions Min.Typ.Max.Units Supply and Reference
V IN Functional Operating Range1V IN6–40V V IN Quiescent Current I INQ LA, LC unconnected––4mA V IN Shutdown Current I INS EN < 400 mV–110μA Startup Time t ON EN 2 V to 35 mA I LC91827μs Current Regulation
Maximum Current Sink I LCmax R S = 250 mW, V IN – V LA > 2 V350––mA Current Sink I LC R S = 286 mW, V IN – V LA > 2 V333350367mA Current Sink Accuracy err ILC100 mA < I LC < 350 mA–5±45% SENSE Reference Voltage V SENREF260 mΩ < R S < 1Ω 97102107mV
氚电池Switch Dropout Voltage V DO V IN – V LA , I LOAD = 350 mA– 2.25 2.35V V IN – V LA , I LOAD = 150 mA– 1.35 1.4V
Regulator Saturation Voltage V SAT V LC – V SENSE, I LOAD = 350 mA–500550mV V LC – V SENSE, I LOAD = 150 mA–250275mV
Output Current Slew Time t r Current rising from 10% to 90%5080120μs t f Current falling from 90% to 10%60100150μs
Logic Input
Input Low Voltage V IL––0.8V Input High Voltage V IH2––V Input Hysteresis V Ihys150350–mV Protection
Switch Overcurrent Trip Level I LAOC–600–500–400mA Overcurrent Detection Time2t OCD From detection to I SCU > –1.2 mA–3–μs Switch Current Limit I LALIM– 1.5×
I LAOC–mA LC Short Circuit Release Voltage V SCCR Measured at V LC, when rising 1.0 1.2 1.4V Short Circuit Source Current2I SCU When short is detected–1.5–1.1–0.7mA Thermal Monitor Activation Temperature T JM T J at I LC = 90%, THTH open90105120ºC Thermal Monitor Low Current Temperature T JL T J at I LC = 25%, THTH open110130150ºC Overtemperature Shutdown Threshold T JF Temperature increasing–165–ºC Overtemperature Hysteresis T Jhys Recovery = T JF – T Jhys–15–ºC 1Functions correctly, but parameters are not guaranteed, below the general limit (7 V).
2For input and output current specifications, negative current is defined as coming out of (sourcing) the specified device pin.
ELECTRICAL CHARACTERISTICS valid at T J = –40°C to 150°C, V IN = 7 to 40 V, unless noted otherwise
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, T JM, 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 re
钢结构安装sistor. 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.缀花草坪
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, I LC, is set by the value, R S ,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:
I LC = V SENREF / R S (1) conversely:
R S = V SENREF / I LC
The nominal output current settings, I LC, versus the current setting resistor values, R S, are given in the following table. The current level defined here is the 100% current level before any current reduct
ion effects due to the temperature monitor, described later in this document.
Sense Resistor Selection
I LC
(mA)
R S
(mΩ)
降香黄檀树
P D(RS)
(mW)
I LC
(mA)
R S
(mΩ)
P D(RS)
(mW) 3502863512580013
30033330100100010
250400257014297
200500205020005
150667153528574 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
Functional Description
