TLE4678 datasheet(21/37 Pages) INFINEON

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Datasheet

Rev. 1.2, 2014-10-17

TLE4678

Reset Function

7.2

Electrical Characteristics Reset Function

Electrical Characteristics: Reset Function

VI = 13.5 V, Tj = -40 °C to +150 °C,

all voltages with respect to ground, direction of currents as shown in Figure 7 (unless otherwise specified).

Parameter

Symbol

Limit Values

Unit

Conditions

Number

Min.

Typ.

Max.

Output Undervoltage Reset Comparator Default Values (Pin RADJ = GND)

Output Undervoltage Reset

Lower Switching Threshold

VRT,lo

4.6

4.7

4.8

VI = 0 V

VQ decreasing

RADJ = GND

7.2.1

Output Undervoltage Reset

Upper Switching Threshold

VRT,hi

4.7

4.8

4.9

VI within operating

range

VQ increasing

RADJ = GND

7.2.2

Output Undervoltage Reset

Switching Hysteresis

VRT,hy

120

–

VI within operating

range

RADJ = GND.

7.2.3

Output Undervoltage Reset

Headroom

VRH

250

300

–

Calculated Value:

VQ - VRT,lo

VI within operating

range

IQ = 50 mA

RADJ = GND

7.2.4

Reset Threshold Adjustment

Reset Adjust

Lower Switching Threshold

VRADJ,th

1.176 1.20

1.224 V

VI = 0 V

3.2 V ≤ VQ < 5 V

7.2.5

Lower Reset Threshold

Adjustment Range 1)

VRT,adj

3.20

–

VRT,lo V–

7.2.6

Reset Output RO

Reset Output Low Voltage

VRO,low

–

0.2

0.4

VI = 0 V;

RRO,ext = 3.3 kΩ;

1V ≤ VQ ≤ VRT,low

7.2.7

Reset Output

External Pull-up Resistor to Q

RRO,ext

3–

–

kΩ

VI = 0 V;

VRO = 0.4 V

1V ≤ VQ ≤ VRT,low

7.2.8

Reset Output

Internal Pull-up Resistor

RRO

kΩ

internally connected

to Q

7.2.9

Reset Delay Timing

Upper Delay

Switching Threshold

VDST,hi

–

1.21

–

7.2.10

Lower Delay

Switching Threshold

VDST,lo

–

0.30

–

7.2.11

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