データシートサーチシステム |
|
TC1017-1.85VCT データシート(PDF) 11 Page - Microchip Technology |
|
TC1017-1.85VCT データシート(HTML) 11 Page - Microchip Technology |
11 / 22 page © 2005 Microchip Technology Inc. DS21813D-page 11 TC1017 4.1 Input Capacitor Low input source impedance is necessary for the LDO to operate properly. When operating from batteries, or in applications with long lead length (> 10") between the input source and the LDO, some input capacitance is required. A minimum of 0.1 µF is recommended for most applications and the capacitor should be placed as close to the input of the LDO as is practical. Larger input capacitors will help reduce the input impedance and further reduce any high-frequency noise on the input and output of the LDO. 4.2 Output Capacitor A minimum output capacitance of 1 µF for the TC1017 is required for stability. The Equivalent Series Resis- tance (ESR) requirements on the output capacitor are between 0 and 2 ohms. The output capacitor should be located as close to the LDO output as is practical. Ceramic materials X7R and X5R have low temperature coefficients and are well within the acceptable ESR range required. A typical 1 µF X5R 0805 capacitor has an ESR of 50 milli-ohms. Larger output capacitors can be used with the TC1017 to improve dynamic behavior and input ripple-rejection performance. Ceramic, aluminum electrolytic or tantalum capacitor types can be used. Since many aluminum electrolytic capacitors freeze at approximately –30 °C, ceramic or solid tantalums are recommended for applications operating below –25 °C. When operating from sources other than batteries, supply-noise rejection and transient response can be improved by increasing the value of the input and output capacitors and employing passive filtering techniques. 4.3 Turn-On Response The turn-on response is defined as two separate response categories, wake-up time (tWK) and settling time (tS). The TC1017 has a fast wake-up time (10 µsec, typical) when released from shutdown. See Figure 4-3 for the wake-up time designated as tWK. The wake-up time is defined as the time it takes for the output to rise to 2% of the VOUT value after being released from shutdown. The total turn-on response is defined as the settling time (t S) (see Figure 4-3). Settling time (inclusive with tWK) is defined as the condition when the output is within 98% of its fully-enabled value (32 µsec, typical) when released from shutdown. The settling time of the output voltage is dependent on load conditions and output capacitance on VOUT (RC response). The table below demonstrates the typical turn-on response timing for different input voltage power-up frequencies: VOUT = 2.85V, VIN = 5.0V, IOUT = 60 mA and COUT = 1 µF. FIGURE 4-3: Wake-Up Time from Shutdown. Frequency Typical (tWK) Typical (tS) 1000 Hz 5.3 µsec 14 µsec 500 Hz 5.9 µsec 16 µsec 100 Hz 9.8 µsec 32 µsec 50 Hz 14.5 µsec 52 µsec 10 Hz 17.2 µsec 77 µsec VIH tS tWK VOUT 98% 2% VIL SHDN |
同様の部品番号 - TC1017-1.85VCT |
|
同様の説明 - TC1017-1.85VCT |
|
|
リンク URL |
プライバシーポリシー |
ALLDATASHEET.JP |
ALLDATASHEETはお客様のビジネスに役立ちますか? [ DONATE ] |
Alldatasheetは | 広告 | お問い合わせ | プライバシーポリシー | リンク交換 | メーカーリスト 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 |