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OPA4237UA250 Datasheet(PDF) 10 Page - National Semiconductor (TI) |
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OPA4237UA250 Datasheet(HTML) 10 Page - National Semiconductor (TI) |
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10 / 22 page  OPA237 OPA2237 OPA4237 SBOS057A − OCTOBER 1996 − REVISED FEBRUARY 2007 www.ti.com 10 APPLICATION INFORMATION OPA237 series op amps are unity-gain stable and suitable for a wide range of general-purpose applications. Power supply pins should be bypassed with 10nF ceramic capacitors. OPERATING VOLTAGE OPA237 series op amps operate from single (+2.7V to +36V) or dual ( ±1.35V to ±18V) supplies with excellent performance. Most behavior remains unchanged throughout the full operating voltage range. Parameters which vary significantly with operating voltage are shown in typical performance curves. Specifications are production tested with +2.7V, +5V, and ±15V supplies. OUTPUT CURRENT AND STABILITY OPA237 series op amps can drive large capacitive loads. However, under certain limited output conditions any op amp may become unstable. Figure 1 shows the region where the OPA237 has a potential for instability. These load conditions are rarely encountered, especially for single supply applications. For example, take the case when a +5V supply with a 10k Ω load to VS/2 is used. OPA237 series op amps remain stable with capacitive loads up to 4,000pF, if sinking current and up to 10,000pF, if sourcing current. Furthermore, in single-supply applications where the load is connected to ground, the op amp is only sourcing current, and as shown Figure 1, can drive 10,000pF with output currents up to 1.5mA. 2 0.5 1 1.5 Output Current (mA) −2 −1.5 −1 −0.5 0 100k 10k 1k 100 10 V S = +2.7V VS =+5V, ±15V OPERATION NOT RECOMMENDED Figure 1. Stability-Capacitive Load vs Output Current R L 10 Ω A1 OPA237 + R 1 38.3k Ω R 3 38.3k Ω R 5 383k Ω R 6 10k Ω R 7 9.09k Ω R 4 20k Ω R 2 19.1k Ω A2 OPA237 R 8 100k Ω R H 10 Ω I H V+ V − V+ V − 2.7V to = ±15V V+ for A 1,A2 −In +In −In +In V O =10 • IH • RH To Load To Load V O =10 • IL • RL Common−mode range of A2 extends to V − for low−side sensing Optional for I B Cancellation (R 7 =R6 II R8) R 2 and R4 divide down the common−mode input to A1. Low−Side Current Sense High−Side Current Sense Out Out NOTE: Low and high−side sensing circuits can be used independently. V − for A 1,A2 I L Figure 2. Low and High-Side Battery Current Sensing |
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