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| 型号： | A2550KLPTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 14/15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
A more rigorous derivation, including R COIL during the
exponential current decay results in:
Relay Driver with 5 V Regulator
for Automotive Applications
Capacitive Loads
When capacitive loads are applied to the outputs, the
i ( t ) = R dc
? R CL
? ? 1 ? exp ? ? t R COIL
and
V
COIL
V
COIL
?
? ? L COIL
? ? ? ,
? ? ?
(17)
constraint described below applies. Such is the case, for
example, when capacitors are attached to the outputs to
protect against ESD. Larger capacitors protect against larger
Δ t =
L COIL
R COIL
ln ( 1 – V dc V CL )
? 1
.
(18)
ESD voltages. However, the upper limit on capacitance is
determined by the blanking time. The latter allows for spuri-
ous current spikes and capacitor discharges to be completed
Energy loss in the driver is:
before the overcurrent detection circuit senses the output cur-
R COIL
E =
V CL V DC L COIL
2
[ 1 + ( V CL V dc ? 1 ) ln ( 1 ? V dc V CL ) ] . (19)
rent (see t BLANK in the Electrical Characteristics table). The
blanking time allows a 47 nF capacitor with 20% tolerance
and nominal 12 V automotive voltages.
Pin-out Diagram
IN1 1
IN2 2
IN3 3
16 OUT1
15 OUT2
14 OUT3
Terminal List Table
LGND 4
NPOR 5
WDI 6
EN 7
VREG5 8
PAD
13 PGND
12 CWD
11 CPOR
10 ENBAT
9 VBB
No. Name
1 IN1
2 IN2
3 IN3
4 LGND
5 NPOR
6 WDI
7 EN
8 VREG5
9 VBB
10 ENBAT
11 CPOR
12 CWD
13 PGND
14 OUT3
15 OUT2
16 OUT1
– PAD
Description
Activate driver 1
Activate driver 2
Activate driver 3
Logic ground; must be connected to PGND externally
Not Power-On Reset
WatchDog Input
Enable (low voltage)
5V regulator
Supply voltage
Enable (high voltage)
Capacitor terminal for Power-On Reset cycle time
Capacitor terminal for WatchDog timing
Power ground; must be connected to LGND externally
Low side driver 3
Low side driver 2
Low side driver 1
Exposed pad for enhanced thermal performance
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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