Electronic Components Datasheet Search |
|
TPS71730DCKRG4 Datasheet(PDF) 11 Page - Texas Instruments |
|
|
TPS71730DCKRG4 Datasheet(HTML) 11 Page - Texas Instruments |
11 / 26 page www.ti.com APPLICATION INFORMATION V = OUT x0.800,R ~320k 2 W (R R 1 2 + ) R 2 (1) Input and Output Capacitor Requirements TPS717xx GND EN NR IN OUT V IN V OUT 1 F m Ceramic V EN Optional1.0 Finput capacitor.Mayimprove sourceimpedance,noise orPSRR. m Optional0.01 Fbypass capacitortoreduce outputnoiseand increasePSRR. m TPS71701 GND EN FB IN OUT V IN V OUT 1 F m Ceramic V EN R 1 R 2 Optional1.0 Finput capacitor.Mayimprove sourceimpedance,noise orPSRR. m TPS717xx SBVS068D – FEBRUARY 2006 – REVISED OCTOBER 2007 The TPS717xx belongs to a family of new generation For the adjustable version (TPS71701), the NR pin is LDO regulators that use innovative circuitry to replaced with a feedback (FB) pin. The voltage on achieve ultra-wide bandwidth and high loop gain, this pin sets the output voltage and is determined by resulting in extremely high PSRR (up to 1MHz) at the values of R1 and R2. The values of R1 and R2 can very low headroom (VIN – VOUT). Fixed voltage be calculated for any voltage using the formula given versions provide a noise reduction pin to bypass in Equation 1: noise generated by the bandgap reference and to improve PSRR while a quick-start circuit fast-charges this capacitor. These features, combined with low noise, enable, low ground pin current, and ultra-small packaging, make this part ideal for portable The value of R2 directly impacts the stability of the applications. This family of regulators offers device and should be chosen at approximately 160k Ω sub-bandgap output voltages, current limit and or 320k Ω. Sample resistor values for common output thermal protection, and is fully specified from –40 °C voltages are shown in Table 2. to +125 °C. Figure 33 shows the basic circuit connections for the Table 2. Sample 1% Resistor Values for Common fixed voltage options. Figure 34 gives the connections Output Voltages for the adjustable output version (TPS71701). Note VOUT R1 R2 that the NR pin is not available on the adjustable 1.0 80.6k Ω 324k Ω version. 1.2 162k Ω 324k Ω 1.5 294k Ω 332k Ω 1.8 402k Ω 324k Ω 2.5 665k Ω 316k Ω 3.3 1.02M Ω 324k Ω 5.0 1.74M Ω 332k Ω Although an input capacitor is not required for stability, it is good analog design practice to connect a 0.1 µF to 1.0µF low equivalent series resistance (ESR) capacitor across the input supply near the regulator. This capacitor will counteract reactive input sources and improve transient response, noise Figure 33. Typical Application Circuit rejection, and ripple rejection. A higher-value (Fixed Voltage Versions) capacitor may be necessary if large, fast rise-time load transients are anticipated or if the device is located several inches from the power source. If source impedance is not sufficiently low, a 0.1 µF input capacitor may be necessary to ensure stability. The TPS717xx is designed to be stable with standard ceramic capacitors of values 1.0 µF or larger. X5R- and X7R-type capacitors are best because they have minimal variation in value and ESR over temperature. Maximum ESR should be <1.0 Ω. The TPS717xx implements an innovative internal compensation circuit that does not require a feedback capacitor across R2 for stability. A feedback capacitor should not be used for this device. Figure 34. Typical Application Circuit (Adjustable Voltage Version) Copyright © 2006–2007, Texas Instruments Incorporated Submit Documentation Feedback 11 |
Similar Part No. - TPS71730DCKRG4 |
|
Similar Description - TPS71730DCKRG4 |
|
|
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 |