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| 型号： | A2550KLPTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 13/15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
P LS = ( R DS(on) × I 2LS1 ) + ( R DS(on) × I 2LS2 )
+ ( R DS(on) × I 2LS3 ) .
Because I LS1 = I LS2 = I LS3 = 110 mA , and
given that R DS(on) = 5 Ω , then
P LS = 3 (5 Ω ) * (110 mA) 2 = 182 mW .
Given also:
P D = P BIAS + P REG + P LS
= 42 mW+ 182 mW+ 182 mW = 406 mW .
T J can be calculated by substitution into equation 6:
T J = 0.406 W × 55°C/W +125°C = 147°C .
(9)
(10)
The output voltage is clamped to protect the driver. The
active clamp works as follows. The voltage at the driver out-
put is pushed high by the inductive current. Once the clamp
voltage, V CL , is reached, a Zener diode conducts current to
the internal FET gate driver block. Therefore, the FET turns
partially on, in order to limit any further increase in voltage
at the output pin. The output is then held at this clamp volt-
age until the current decays to zero, as shown in figure 4.
Energy loss in the chip, E, may be calculated as follows.
Load coil resistance, R COIL , is usually a significant value,
but a worst case scenario takes R COIL = 0 for simplicity. With
active clamping at V CL , the output current (with initial value
I OUT0 ) is driven low and the upper limit on energy loss in the
driver is calculated as:
E max = 1 I OUT0 V CL Δ t .
Reverse Battery
The low-side driver outputs can withstand reverse battery
when the load (R LOADx ) is connected to limit current. Power
dissipation (P D = P LS(rvrs) ) is limited by thermal constraints,
according to the following formula:
(11)
P LS(rvrs) = V F1 × I F1 + V F2 × I F2 + V F3 × I F3 ,
From figure 4:
and
2
Δ t = L COIL I OUT0 ,
V CL – V dc
(14)
(15)
E max = 1 L COIL OUT0 (1– V dc / V CL ) .
I
where:
2
2 –1
(16)
I F x =
V BB(rvrs) ? V F x .
R LOAD x
(12)
Active Clamp on Outputs
I OUT
The driver section includes an active clamp that prevents an
overvoltage when an inductive load is switched off. Zener
diodes are connected at the output pins. This removes the
need for external freewheeling diodes across inductive loads.
I OUT0 =
V dc
R COIL
m =
–( V CL – V dc )
L COIL
The coil current, I COIL , is quenched by allowing the output
pin voltage, V OUT x , to exceed the battery voltage at the load,
V dc . This applies a negative voltage drop across the load.
Therefore the current gradient is driven negative, as shown in
the following formula:
Δ t
dI COIL
dt
=
V dc ? V OUT ? I COIL × R COIL
L COIL
< 0 .
(13)
Figure 4. Output Voltage Clamping
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
13
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