2.2 Current Sense Amplifier + Output Buffer

The internal configuration of the TS1105 unidirectional and TS1106 bidirectional current-sense amplifiers are buffered variations of the

TS1100 unidirectional and TS1101 bidirectional current-sense amplifier respectively. The TS1106 current-sense amplifier is configured

Referring to the block diagrams, the inputs of the TS1105/06’s differential input/output amplifier are connected to RS+ and RS– across

Thus, since the PMOS source for both M1 and M2 are connected to the inverting input of the internal op-amp and since the voltage

R

or

R

non-inverting terminal of the transimpedance amplifier is internally connected to VBIAS, therefore the output voltage of the TS1105/06

at the OUT terminal is

R

Table 2.1. Internal Gain Setting Resistors (Typical Values)

GAIN (V/V)

Part Number

20

2 k

40 k

TS1105-20

200

200

40 k

TS1105-200

20

2 k

40 k

TS1106-20

200

200

40 k

TS1106-200

The TS1105/06 allows access to the inverting terminal of the transimpedance amplifier by the FILT pin, whereby a series RC filter may

be connected to reduce noise at the OUT terminal. The recommended RC filter is 4 kΩ and 0.47 μF connected in series from FILT to

GND to suppress the noise. Any capacitance at the OUT terminal should be minimized for stable operation of the buffer.

TS1105/06 Data Sheet

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