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参数资料
| 型号： | A6268KLPTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 14/19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
Protection Not Provided
Boost Mode
Automotive High Current LED Controller
the input source supply recovers, the A6268 will automatically
restart and the process will be repeated.
? The cathode end of the LED string is shorted to VBAT –
Although an LED sense resistor overcurrent fault is produced,
causing an FF1 flag, the LED sense resistor, RSS , is effectively
between VBAT and ground. Depending on either the current
limit of the source supply, or the input fuse rating, the fault cur-
rent may damage the LED sense resistor.
? The LF node is shorted to VBAT – Although a LED sense
resistor overcurrent fault is produced, causing an FF1 flag, the
LED sense resistor, RSS , and the reference LED are effectively
between VBAT and ground. Depending on the current limit of
the source supply, or the input fuse rating, the fault current may
damage the LED sense resistor and/or the reference LED.
? The cathode connection is shorted to ground – A fault current
determined by the impedance of the shorting link (now effec-
tively the LED sense resistor, RSS ) flows through the power
circuit. The fault current will either be limited by the maximum
switch current sense, V IDS , or if the source supply cannot main-
tain this current, the source supply will either foldback, or if the
current exceeds the input fuse rating, the fuse will blow, causing
an open circuit.
? The anode connection is shorted to ground during startup –
A fault current determined by the current limit of the source
supply (VBAT), or a value less than the input fuse rating, will
flow through the series protection FET, inductor, and recircula-
tion diode. If the source supply can supply the fault current for
the duration of the fault blank period, t BK , then an FF1 flag will
occur. Otherwise, either the source supply voltage will fold back
and an input voltage UVLO will occur, disabling the A6268,
or the input fuse will blow, causing an open circuit. Assuming
Buck-Boost Mode
? The cathode end of the LED string is connected to VBAT –
The short circuit impedance effectively appears in parallel with
the series protection MOSFET and the LED sense resistor, RSS .
This will tend to reduce the effective impedance of the LED
sense resistor and correspondingly increase the LED current.
? The anode connection is shorted to ground during startup –
A fault current determined by the current limit of the source
supply (VBAT), or a value less than the input fuse rating, will
flow through the series protection FET, inductor, and recircula-
tion diode. If the source supply can supply the fault current for
the duration of the fault blank period, t BK , then an FF1 flag will
occur. Otherwise, either the source supply voltage will fold back
and an input voltage UVLO will occur, disabling the A6268,
or the input fuse will blow, causing an open circuit. Assuming
the input source supply recovers, the A6268 will automatically
restart and the process will be repeated.
To ensure the A6268 inputs (LP and LN) are not damaged dur-
ing any of the above faults, it is necessary to add differential
resistors between each of the LED sense resistor connections
and the respective connection to the A6268. In the case of buck
boost mode, one resistor is used on each connection. In the case
of boost mode, only one resistor is required between the LN
input and the cathode connection of the sense resistor. Refer to
the circuit diagrams on page 3. These resistor values should be
approximately 150 Ω .
If an output short is detected but it is necessary to keep the output
active, the FF1 output can be pulled low. This will override the
output disable but will not clear the fault.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
14
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