CS8182 datasheet(6/12 Pages) ONSEMI

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CS8182

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APPLICATION NOTES

VOUT Short to Battery

The CS8182 will survive a short to battery when hooked

up the conventional way as shown in Figure 13. No damage

to the part will occur. The part also endures a short to battery

when powered by an isolated supply at a lower voltage as in

Figure 14. In this case the CS8182 supply input voltage is set

at 7 V when a short to battery (14 V typical) occurs on VOUT

which normally runs at 5 V. The current into the device

(ammeter in Figure 14) will draw additional current as

displayed in Figure 15.

VOUT

GND

Adj

VIN

GND

VREF/

ENABLE

VOUT

5.0 V

70 mA

C1*

1.0

Automotive Battery

typically 14 V

Short to battery

Figure 13.

C2**

VOUT

GND

Adj

VIN

GND

VREF/

ENABLE

VOUT

C1*

1.0

Figure 14.

C2**

C3***

10 nF

VOUT = VREF

5.0 V

Loads

B+

5.0 V

70 mA

Automotive Battery

typically 14 V

Short to battery

VOUT = VREF

5.0 V

Loads

B+

C3***

10 nF

7 V

** C2 is required for stability.

* C1 is required if the regulator is far from the power source filter.

*** C3 is recommended for EMC susceptibility.

−

Figure 15. VOUT Short to Battery

2.0

1.8

1.6

1.4

1.2

1.0

0.6

0.4

0.2

510

VOUT VOLTAGE (V)

0.8

7 8 9

11121314

16171819

2122 2324

Switched Application

The CS8182 has been designed for use in systems where

the reference voltage on the VREF/ENABLE pin is

continuously

on.

Typically,

the

current

into

the

VREF/ENABLE pin will be less than 1.0 mA when the

voltage on the VIN pin (usually the ignition line) has been

switched out (VIN can be at high impedance or at ground.)

Reference Figure 16.

VOUT

GND

Adj

VIN

GND

VREF/

ENABLE

VOUT

VREF

5.0 V

VBAT

1.0

Ignition

Switch

< 1.0

Figure 16.

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