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STLM20DD Datasheet(PDF) 11 Page - STMicroelectronics |
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STLM20DD Datasheet(HTML) 11 Page - STMicroelectronics |
11 / 17 page STLM20 Capacitive load 11/17 5 Capacitive load The STLM20 will handle capacitive loads of up to 300pF. Over the specified temperature range, the STLM20 has a maximum output impedance of 160 Ω. In a noisy environment, it may be advisable to add some filtering to minimize noise in the output voltage. A 0.1µF capacitor added between the supply voltage and ground is recommended. In an extremely noisy environment, it may be necessary to add a low-pass filter network to the output of the device. A 1µF capacitor, in addition to the output impedance of the device, and a 200 Ω series resistor, will provide a low-pass filter that will pass the slow thermal time constant of the STLM20, while filtering the higher frequency noise. Figure 3. Filter network for noisy environments or capacitive loads > 300pF Table 7. Resistor/capacitor combinations for the filter network RFILTER CFILTER 200 Ω 1µF 470 Ω 0.1µF 680 Ω 0.01µF 1000 Ω 1000pF 10k Ω 100pF 100k Ω 10pF VCC RFILTER CFILTER GND 0.1µF Bypass Capacitor VOUT CL AI12259 VCC RFILTER CFILTER GND 0.1µF Bypass Capacitor VOUT CL AI12260 |
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