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A6155SO8B

更新时间： 2024-11-04 22:18:51
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15页 462K
描述
High Efficiency Linear Power Supply

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A6155SO8B 数据手册

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EM MICROELECTRONIC-MARIN SA  
A6155  
High Efficiency Linear Power Supply with  
Extremely Accurate Power Surveillance, Software  
Monitoring and Sleep Mode Detection  
state for a regulated output voltage as low as 1.2 V.  
Features  
„ Can-bus sleep mode detector  
The watchdog function monitors software cycle time  
and execution. If software clears the watchdog too  
quickly (incorrect cycle time) or too slowly (incorrect  
execution) it will cause the system to be reset. The  
system enable output prevents critical control  
functions being activated until software has  
successfully cleared the watchdog three times. Such a  
security could be used to prevent motor controls  
being energized on repeated resets of a faulty system.  
If the microcontroller does not work that means no  
signal on the TCL input the A6155 goes in a standby  
mode (CAN-bus sleep detector).  
„ Highly accurate 5 V, 100 mA guaranteed output  
„ Low dropout voltage, typically 380 mV at 100 mA  
„ Low quiescent current, typically 155 µA  
„ Standby mode, maximum current 350 µA (with  
100 µA load on OUTPUT)  
„ Unregulated DC input can withstand –20 V reverse  
battery and + 60 V power transients  
„ Fully operational for unregulated DC input voltage  
up to 26 V and regulated output voltage down to 3.0 V  
„ Reset output guaranteed for regulated output voltage  
down to 1.2 V  
„ No reverse output current  
„ Very low temperature coefficient for the regulated output  
„ Current limiting  
„ Comparator for voltage monitoring,voltage reference  
1.275 V  
Applications  
„ Automotive systems  
„ Cellular telephones  
„ Security systems  
„ Battery powered products  
„ High efficiency linear power supplies  
„ Industrial electronics  
„
„
2.0% voltage reference accuracy at +25 °C (3 to 5.5 V)  
2.7% voltage reference accuracy from –40 to  
+85 °C (3 to 5.5 V)  
„ Programmable reset voltage monitoring  
„ Programmable power-on reset (POR ) delay  
„ Watchdog with programmable time windows guarant-  
ees a minimum time and a maximum time between  
software clearing of the watchdog  
Typical Operating Configuration  
„ Time base accuracy 10%  
„ System enable output offers added security  
„ TTL/CMOS compatible  
Unregulat-  
ed voltage  
5 V  
INPUT OUTPUT  
„ -40 to +85 °C temperature range  
„ DIP8 and SO8 packages  
A6155  
Description  
R
VIN  
TCL  
RES  
EN  
The A6155 offers a high level of integration by combining  
voltage regulation, voltage monitoring and software  
monitoring in an 8 lead package. The voltage regulator  
has a low dropout voltage (typ. 380 mV at 100 mA) and a  
low quiescent current (155 µA). The quiescent current  
increases only slightly in dropout prolonging battery life.  
Built-in protection includes a positive transient absorber for  
up to 60 V (load dump) and the ability to survive an  
unregulated input voltage of –20 V (reverse battery). The  
input may be connected to ground or a reverse voltage  
without reverse current flow from the output to the input. A  
comparator monitors the voltage applied at the VIN input  
comparing it with an internal 1.275 V reference. The  
power-on reset function is initialized after VIN reaches  
1.275 V and takes the reset output inactive after TPOR  
depending of external resistance. The reset output  
goes active low when the VIN voltage is less than 1.275 V.  
The RES and EN outputs are guaranteed to be in a correct  
VSS  
GND  
Fig. 1  
Pin Assignment  
DIP8/ SO8  
EN  
VIN  
RES  
TCL  
VSS  
R
A6155  
OUTPUT  
INPUT  
Fig. 2  
1
1234567...15

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