U4793B-FP - Atmel Corporation

Features

•10 kV – ESD Prot ecti on

•Two Comparators with Common Reference

•Tight Threshold Tolerance

•Constant Threshold

•NPN Output

•Interference and Damage-protection According to VDE 0839 and ISO/CD 7637

•EMI Protection

•Re ver s al Polarity Pro tecti on

•Load-dump Protection

Description

The bipolar U4793B is designed to monitor overload or a short circuit in automotive or

industr ia l appli catio ns. The thres hold is tied to V4,6 = VS - VT where VT= 44.5 mV. It is

independent of the sup ply voltage, VS. If the voltage drop across shunt resistor, Rsh,

exceeds this value, the output is turned on, otherwise the output is turned off.

Without s up ply voltage or ope n i npu t Pi n 8, the out put is turne d off. The ou tpu t br ea k-

down v oltage is determined by the Z-diodes Z3 and Z5 with a typical value of VZ=22V.

An unused comparator input must be connected to Pin 7.

Block Diagram

Figure 1. Schematic and Application Circuit

R1150 W

VSVBatt

Rsh

Load

0.6 VS

OUT1

OUT2

Current Monitor

U4793B

Rev. 4557A–AUTO–11/02

2U4793B 4557A–AUTO–11/02

Pin Configuration

Figure 2. Pinning DIP8/SO8

GND

OUT2

IN1

Input swi tch

VRef

IN2

OUT1

Pin Description

Pin Symbol Function

1 GND Reference point, ground

2 VS Supply voltage

3 OUT2 Output 2

4 IN1 Input 1

5 OUT1 Output 1

6 IN2 Input 2

7 VRef Reference voltage

8 Input switch Input switch

Absolute Maxim u m Ratings

Parameters Symbol Value Unit

Supply voltage Pin 2, 7 VS16.5 V

Curr ent co nsu mp t io n

t = 2 ms, measured at Pin 1 (GND) Pin 1 I11.5 A

Output current Pin 3, 5 I3,5 20 mA

Input voltage reference point Pin 7 Pin 4, 6 -V4,6 6V

Power dissipation Tamb = 125°C,DIP8

SO8 Ptot 220

150 mW

Tamb = 95°C, DIP8

SO8 Ptot 420

360 mW

Tamb = 60°C, DIP8

SO8 Ptot 690

560 mW

Ambient tem per a ture r ang e Tamb -40 to +125 °C

Storage temperature ran ge Tstg -5 5 to +125 °C

Junction temperature Tj150 °C

Thermal Resistance

Parameters Symbol Value Unit

Junction ambient DIP8

SO8 RthJA

RthJA

110

160 K/W

K/W

U4793B

4557A–AUTO–11/02

Electrical Characteristics

VS = 9 V to 15 V, Tamb = -40°C to +125°C, unless otherwise specified (see Figure 1)

No. Parameters Test Conditions Pin Symbol Min. Typ. Max. Unit Type*

1 Supply

1.1 Supply voltage 2, 7 VS915VA

1.2 Internal Z-diode Z22V

Z20 V A

1.3

Current consumption

VS = 12 V measured

Tamb = -40°C1I13.5 4.8 6.0 mA C

1.4 VS = 12 V measured

Tamb = 25°C1I12.8 3.4 6.0 mA A

1.5 VS = 12 V measured

Tamb = 125°C1I12.0 2.6 3.2 mA C

2 Output

2.1 Output saturation

voltage

VS = 9 V,

I3,5 = 10 mA

Tamb = 25°C 3, 5 Vsat 0.5 V A

2.2 Output Z-diodes Z3,

3, 5 VZ21 V A

3 Control Signal

3.1

Control signal

threshold

I3,5 = 1 mA, figure 3

Tamb = -40°C4, 6 -VT42 44 46 mV C

3.2 I3,5 = 1 mA, figure 3

Tamb = 25°C4, 6 -VT43 44.5 46 mV A

3.3 I3,5 = 1 mA, figure 3

Tamb = 125°C4, 6 -VT44.5 46 47.5 mV C

3.4 Temperature

coefficient of control

signal thre sho ld TC 15 µV/K C

3.5 Input currents

Pins connected

to 12 V

Tamb = -40°C4, 6 II100 190 nA C

3.6 Tamb = 25°CI

I60 100 150 nA A

3.7 Tamb = 125°CI

I30 110 nA C

3.8 Input currents

Pins connected

to 12 V

Tamb = -40°C 8 II5.5 7.0 µA C

3.9 Tamb = 25°CI

I4.0 5.0 5.5 µA A

3.10 Tamb = 125°CI

I3.0 4.5 µA C

4Threshold

4.1

Threshold voltage

Switch identification

Tamb = -40°C

V80.47 ´

0.69 ´

VSVC

4.2 Switch identification

Tamb = 25°CV80.47 ´

VS0.6 VS0.69 ´

VSVA

4.3 Switch identification

Tamb = 125°CV80.47 ´

0.69 ´

VSVC

*) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Desi gn parameter

4U4793B 4557A–AUTO–11/02

Figure 3. Timing Diagram

Figure 4. Threshold Voltage = f (VBatt and Temperature)

5Switch Delay (RL = 10 kW connected from Pin 3 or Pin 5 to VBatt)

5.1 Delay time

Switch-on

High to low

Tamb = -40°C

3, 5

td(on) 346µs C

5.2 Tamb = 25°Ctd(on) 468µs C

5.3 Tamb = 125°Ctd(on) 579µs C

5.4 Delay time

Switch-off

Low to high

Tamb = -40°Ctd(off) 16 24 32 µs C

5.5 Tamb = 25°Ctd(off) 18 30 50 µs A

5.6 Tamb = 125°Ctd(off) 30 50 70 µs C

Electrical Characteristics (Continued)

VS = 9 V to 15 V, Tamb = -40°C to +125°C, unless otherwise specified (see Figure 1)

No. Parameters Test Conditions Pin Symbol Min. Typ. Max. Unit Type*

*) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Desi gn parameter

12.00

11.90

V4,6

V0td(off) td(on)

10 20 30 40 50 60

(V)

(ms)

6.0 7.0 8.0 9.0 10.0 11.0 12.0 13.0 14.0 15.0 16.0

Tamb = 125°C

-40°C

25°C

95°C

-V T( mV )

VBatt ( V )

U4793B

4557A–AUTO–11/02

Packag e Information

Ordering Information

Extended Type Number Packag e Remarks

U4793B DIP8 –

U4793B-FP SO8 –

9.8

9.5

Package DIP8

Dimensions in mm

1.64

1.44

4.8 max

0.5 min 3.3

0.58

0.48

7.62

2.54

6.4 max

0.36 max

9.8

8.2

7.77

7.47

technical drawings

according to DIN

specifications

technical drawings

according to DIN

specifications

Package SO8

Dimensions in mm 5.00

4.85

0.4

1.27 3.81

1.4

0.25

0.10

5.2

4.8

3.7

3.8

6.15

5.85

0.2

Printed on recycled paper.

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4557A–AUTO–11/02 xM

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