UCC1926

UCC2926

UCC3926

SLUS266A - OCTOBER 1999

FEATURES

• Integral Non-inductive Current Sense

Element with Internal Kelvin

Connections

• 20A Current Rating

• Bi-directional, High Side or Low Side

Sensing

• Internal Temperature Nulling Circuitry

for Current Sense Element and

Amplifier

• Logic Compatible Current Direction

Status Output

• Low Offset, Chopper Stabilized

Current Sense Amplifier

• Uncommitted Amplifier with User

Programmable Gain

• Overcurrent Indication with User

Programmable Threshold

DESCRIPTION

The UCC3926 Current Sensor IC contains a wideband, transimpedance

amplifier for converting the current through an internal, non-inductive

1.3m

Ω shunt resistor into a proportional voltage. The sense element oper-

plications.

The UCC3926 can measure currents up to

±20A. This transimpedance am-

plifier gain is precisely trimmed to 33.3m

Ω to convert a 15A input into a

500mV output signal. It has a very low input offset voltage from chop-

per-stabilization. A cross-switching block rectifies the input signal by forcing

the differential output, AOP positive with respect to the other differential

output, AON. SIGN indicates the polarity of the current.

The UCC3926 programmable amplifier provides three functions. It converts

the differential transimpedance output signal into a single-ended signal. It

has a user-controlled gain stage that sets the maximum current level to the

desired voltage and it level shifts the zero current point to the desired level

as well. A comparator then compares the output of the instrumentation am-

plifier to a user-set reference voltage on OCREF, which provides an

overcurrent status bit OC.

The UCC3926 is available in the 16 pin SOIC package.

± 20A Integrated Current Sensor

BLOCK DIAGRAM

UDG-97139-1

application

INFO

available