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| 型号： | A6268KLPTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 8/19页 |
| 文件大小： | 0K |
| 描述： | IC LED CTLR AUTOMOBILE 16TSSOP |
| 标准包装： | 1 |
| 恒定电流： | 是 |
| 拓扑： | 低端，PWM，SEPIC，降压（降压），升压（升压） |
| 输出数： | 1 |
| 内部驱动器： | 无 |
| 类型 - 主要： | 车载，背光 |
| 频率： | 100kHz ~ 700kHz |
| 电源电压： | 5 V ~ 50 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 供应商设备封装： | 16-TSSOP-EP |
| 包装： | 标准包装 |
| 工作温度： | -40°C ~ 150°C |
| 其它名称： | 620-1473-6 |
A6268
Automotive High Current LED Controller
Functional Description
The A6268 is a DC-DC converter controller that is designed to
drive series-connected high power LEDs in automotive applica-
tions. It provides programmable constant current output at load
voltages and currents limited only by the external components.
For automotive applications optimum performance is achieved
when driving up to 15 LEDs at currents up to 1 A.
The A6268 can be configured as a standard boost converter or
as a supply referenced boost converter. In the supply referenced
configuration the load voltage is the difference between the boost
voltage and the supply voltage. This difference can be greater
than, equal to, or less than the supply voltage, effectively provid-
ing a buck-boost capability. This configuration provides seam-
less, uninterrupted operation over the wide supply voltage range
possible in automotive applications and, because the output is ref-
erenced to the positive supply, there is no load current to ground.
This ensures that there is no leakage path through the LEDs when
in shutdown and no inrush current at power-up.
The A6268 integrates all necessary control elements to pro-
vide a cost-effective solution using a single external logic-level
MOSFET and minimum additional external passive components.
The LED current is set by selecting an appropriate value for the
sense resistor value and using the EN input to provide simple
on-off control or for PWM brightness control using a suitable
externally generated PWM signal. The LED current can be
reduced in a single step by reducing the voltage between the
IREF pin and GND to less than 1 V.
The pin functions and circuit operation are described in detail in
the following sections.
Pin Functions
VIN Supply to the control circuit. A bypass capacitor must be
connected between this pin and GND.
GND Ground reference connection. This pin should be connected
directly to the negative supply.
EN Logic input to enable operation. Can be used as direct PWM
input. Chip enters low power sleep mode when low for longer
than the disable time, t DIS .
FF1 Fault Flag output and isolation control. Open drain current
sink output, when high impedance indicates detection of a critical
circuit fault. An external pull-up resistor should be connected to a
suitable logic supply for simple logic fault flag operation or to the
source of the PMOS FET used to isolate the load from the supply.
Table 1 defines when FF1 is active. If FF1 is pulled low when
an output short fault is indicated then the output disable will be
overridden.
FF2 Fault Flag output. Open drain output, when high impedance
indicates detection of a circuit fault. An external pull-up resistor
should be connected to a suitable logic supply. If VREG is not
used, then the logic supply should not be pulled 300 mV above
VREG. Table 1 defines when FF2 is active. If FF2 is pulled low
when an open LED fault is indicated then the output disable will
be overridden.
OSC Resistor to ground to set the internal oscillator or clock
input from external oscillator. When connected to VREG or GND
the oscillator runs at typically 350 kHz. Higher accuracy in the
frequency is possible by connecting a resistor from this pin to
ground or by driving this pin with an external precision oscillator.
CKOUT Logic output at the oscillator frequency with phase
shift. Used to drive succeeding controllers to interleave switching
instants.
IREF LED current reference modifier. A voltage input that can be
used to reduce the LED current sense voltage. When connected to
VREG, the current sense voltage, V IDL , and the value of the sense
resistor, R SL , define the maximum LED current.
SG Gate drive for external logic-level MOSFET low-side switch
that connects the inductor to ground.
SP, SN Sense amplifier connections for switch current limit
sense resistor, R SS .
LP Positive sense amplifier connection for LED current limit
sense resistor, R SL .
LN Negative sense amplifier connection for LED current limit
sense resistor, R SL . The voltage at LN also determines whether
the boost or buck-boost mode is configured.
VREG Compensation capacitor for internal 5 V regulator.
LA Anode reference connection to LEDs. Using an external resis-
tor divider with the same ratio as the number of LEDs provides
a measurement of the voltage across all LEDs in the load. This
is compared to the voltage on the LF pin to provide shorted LED
detection. In addition, it is compared against voltage references to
provide open circuit or shorted LED string detection.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
8
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