Electronic Components Datasheet Search |
|
REG103FA-2.5 Datasheet(PDF) 10 Page - Texas Instruments |
|
REG103FA-2.5 Datasheet(HTML) 10 Page - Texas Instruments |
10 / 26 page REG103 10 SBVS010D Since the value of VREF is 1.295V, this relationship reduces to: V Vrms V V N OUT = µ • 35 Connecting a capacitor, CNR, from the Noise-Reduction (NR) pin to ground, can reduce the output noise voltage. Adding CNR, as shown in Figure 7, forms a low-pass filter for the voltage reference. For CNR = 10nF, the total noise in the 10Hz to 100kHz bandwidth is reduced by approximately a factor of 3.5, as shown in Figure 8. FIGURE 7. Block Diagram. Over Current Over Temp Protection V REF (1.295V) Low Noise Charge Pump DMOS Output R 1 NOTE: R 1 and R2 are internal on fixed output versions. V OUT Adj (Adjustable Versions) R 2 NR (fixed output versions only) ENABLE REG103 V IN ERROR C NR (optional) FIGURE 8. Output Noise versus Noise-Reduction Capacitor. 0.001 0.01 0.1 1 45 35 25 C NR (µF) C OUT = 0 C OUT = 10µF FIGURE 9. Output Noise Density on Adjustable Versions. 100 10 1000 10000 100000 10.0 1.0 0.1 Frequency C OUT = 0, CFB = 0 C OUT = 0, CFB = 0.01µF C OUT = 10µF, CFB = 0.01µF The REG103 adjustable version does not have the noise- reduction pin available, however, the adjust pin is the sum- ming junction of the error amplifier. A capacitor, CFB, connected from the output to the adjust pin will reduce both the output noise and the peak error from a load transient. Figure 9 shows improved output noise performance for two capacitor combinations. The REG103 utilizes an internal charge pump to develop an internal supply voltage sufficient to drive the gate of the DMOS pass element above VIN. The charge-pump switch- ing noise (nominal switching frequency = 2MHz) is not measurable at the output of the regulator. DROP-OUT VOLTAGE The REG103 uses an N-channel DMOS as the “pass” element. When the input voltage is within a few hundred millivolts of the output voltage, the DMOS device behaves like a resistor. Therefore, for low values of VIN to VOUT, the regulator’s input-to-output resistance is the RdsON of the DMOS pass element (typically 230m Ω). For static (DC) loads, the REG103 will typically maintain regulation down to VIN to VOUT voltage drop of 115mV at full-rated output current. In Figure 10, the bottom line (DC dropout) shows the minimum VIN to VOUT voltage drop required to prevent drop-out under DC load conditions. |
Similar Part No. - REG103FA-2.5 |
|
Similar Description - REG103FA-2.5 |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.COM |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |