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参数资料
| 型号： | A2550KLPTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 11/15页 |
| 文件大小： | 0K |
| 描述： | IC RELAY DRVR AUTO W/REG 16TSSOP |
| 标准包装： | 1 |
| 应用： | 汽车用，继电器驱动器 |
| 输出数： | 3 |
| 电源电压： | 7 V ~ 40 V |
| 工作温度： | -40°C ~ 125°C |
| 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 |
| 产品目录页面： | 1141 (CN2011-ZH PDF) |
| 其它名称： | 620-1182-6 |
A2550
Relay Driver with 5 V Regulator
for Automotive Applications
Applications Information
I REG5 <
Dropout Voltage
For operation with V BB below the specified range of operat-
ing voltages, use the Pass Transistor On-Resistance R REG5
to determine the maximum allowed regulator current,
I REG5(max) . This current is limited by the difference between
V BB and V REG5 , according to the following equation:
V BB ? V REG5 (1)
R REG5
Figure 3 shows the results of this condition combined with
the rated regulator current, in normal operation.
Note that, although the regulator is specified for normal
operation with V BB well above normal automotive voltages,
in general thermal constraints will limit maximum opera-
tional V BB .
Fault Logic
The A2550 offers several protection and fault detection
NPOR
The following faults generate a RESET state:
? watchdog alarm
? VREG5 falls below the UVLO level
In addition, the following conditions cause a low NPOR
signal if the NPOR pin is pulled up by VREG5 (because
these conditions disable VREG5):
? overtemperature (Thermal Shut Down)
? no ENABLE signal (EN = ENBAT = 0)
70
60
50
40
30
20
10
features. The operation of thermal shutdown, watchdog
monitoring of the microcontroller, and regulated voltage
0
0
5
10
15
20
undervoltage lockout are described in the Timing Diagrams
section. The fault logic is described in table 1.
Table 1 . Fault Logic a
V BB (V)
Figure 3. Current Capability of the 5 V Regulator (VREG5)
Inputs
Outputs
Mode of Operation
1
1
1
1
1
0
0
0
0
0
1
X
0
0
0
1
X
X
0
0
1
X
X
X
0
1
X
X
X
X
1
1
1
1
1
0
1
1
1
1
0
0
1
1
Pulse
0
0
Off
INx
Z
Z
Z
Z
Z
Normal Operation: OUTx active for INx active.
OCx disables OUTx only. OUTx latched OFF until INx
removed and reapplied.
NPOR periodically pulses to attempt RESET of
microcontroller.
NPOR remains active after UVLO recovers until POR
delay expires.
Sleep mode. NPOR = 0 when pulled up by VREG5
because VREG5 = 0.
a X
indicates “don’t care,” Z indicates high impedence.
b This
entry is a logical OR of the EN and ENBAT pins.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
11
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