Data Sheet

16

Rev. 1.2, 2016-01-28

TLE7186F

Shunt Signal Conditioning

6

Shunt Signal Conditioning

The TLE7186F incorporates a fast and precise operational amplifier for conditioning and amplification of the

current sense shunt signal. The gain of the OpAmp is adjustable by external resistors within a range higher than 5.

The usage of higher gains in the application might be limited by required settling time and band width.

It is recommended to apply a small offset to the OpAmp, to avoid operation close to the lower rail at low currents.

The output of the OpAmp ISO is not short-circuit proof.

In addition to the integrated operational amplifier, the TLE7186F incorporates a comparator to detect over current

situations. The output voltage

V

OpAmp supply (VDD). If

V

Figure 5

Shunt Signal Conditioning Block Diagram and Over Current Limitation

Over current shut down see Chapter 9.2.13.

6.1

Electrical Characteristics

Electrical Characteristics - Current sense signal conditioning

V

Pos.

Parameter

Symbol

Limit Values

Unit

Conditions

Min.

Typ.

Max.

6.1.1

Series resistors

R

S

100

500

1000

Ω

–

6.1.2

Feedback resistor

R

fb

2000

7500

–

Ω

–

6.1.3

Resistor ratio (gain ratio),

max. gain limited by settling time

R

fb/RS

5–

––

R

6.1.4

Input differential voltage (ISP - ISN)

V

IDR

-800

–

800

mV

–

6.1.5

Input voltage (Both Inputs - GND)

(ISP - GND) or (ISN -GND)

V

LL

-800

–

2000

mV

–

6.1.6

Input offset voltage of the I-DC link

OpAmp, including temperature drift

V

IO

––

+/-2

mV

R

V

6.1.7

Input bias current (ISN,ISP to

GND)

I

IB

-300

–

–

µA

V

external

ASIC

internal

-

+

ERR

ISN

ISP

ISO

-

+

µC

fc < 1 Mhz

330pF