for further information contact your local stmicroelectronics sales office. may 2014 docid026324 rev 1 1/4 STEVAL-ISQ014V1 low-side current sensing evaluation board based on the tsz121 op amp data brief features ? very high accuracy: offset voltage 5 v max at 25 c, 8 v over full temperature range (-40 c to 125 c) ? rail-to-rail input and output ? low supply voltage: 1.8 - 5.5 v ? low power consumption: 40 a max. at 5 v ? gain bandwidth product: 400 khz ? high tolerance to esd: 4 kv hbm ? extended temperature range: -40 to +125 c ? micro-packages: sc70-5 (tsz121), dfn8 2x2 (tsz122), and qfn16 3x3 (tsz124) ? rohs compliant description the STEVAL-ISQ014V1 product evaluation board implements low-side current sensing which consists in placing a sense resistor between the load and the circuit ground. the resulting voltage drop is amplified using a tsz121 op amp. the common mode voltage is close to ground, whatever the voltage of the power source, so the current sense voltage can be amplified by this low voltage op amp without restriction. the circuit offers very stable electrical characteristics over the entire supply voltage range and is particularly suited for automotive and industrial applications. thanks to the highly accurate tsz121 op amp, precise current measurements can be made through your application without the added cost of high-precision resistors. www.st.com
schematic diagram STEVAL-ISQ014V1 2/4 docid026324 rev 1 1 schematic diagram figure 1. STEVAL-ISQ014V1 circuit schematic v+ v- 3 4 1 2 6 tsz121ilt 33nf cf vccp vccn vccp 47k rf1 47k rf2 100 rg1 22nf c1 100 rg2 vout in vcc out vccn gnd rsh 30m
docid026324 rev 1 3/4 STEVAL-ISQ014V1 revision history 4 2 revision history table 1. document revision history date revision changes 08-may-2014 1 initial release.
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