 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
NCP1835MN24T2 Datasheet(PDF) 11 Page - ON Semiconductor |
|
||||||||||||||||||||||||||||||
NCP1835MN24T2 Datasheet(HTML) 11 Page - ON Semiconductor |
|
|
11 / 17 page  NCP1835 http://onsemi.com 11 APPLICATION INFORMATION Input and Output Capacitor Selection A 4.7 mF or higher value ceramic capacitor is recommended for the input bypass capacitor. For the output capacitor, when there is no battery inserted and the NCP1835 is used as an LDO with 4.2 V or 4.242 V output voltage, a 4.7 mF or higher value tantalum capacitor is recommended for stability. With the battery attached, the output capacitor can be any type with the value higher than 0.1 mF. RISEL Resistor Selection for Programming Charge Current A single resistor, RISEL, between the ISEL pin and ground programs the pre−charge current, full charge current, and end−of−charge detection threshold. The nominal voltage of ISEL is 0.8 V. The charge current out of BAT pin is 100,000 times the current out of ISEL pin. Therefore, the full charge current (IFCHG) is: IFCHG + 100, 000 0.8 RISEL (A) (eq. 1) IPC and IEOC are 10% of the value programmed above with the RISEL resistor. The following table and curves show the selection of the resistance value for desired currents. Table 2. Charge Current vs. RISEL IFCHG (mA) IPC / IEOC (mA) RISEL (kW) 300 30 267 500 50 160 600 60 133.3 700 70 114.3 800 80 100 900 90 88.9 1000 100 80 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 80 100 120 140 160 180 200 RISEL (kW) Figure 16. Full−Charge Current (IFCHG) vs. Current Select Resistor (RISEL) 0.00 0.02 0.04 0.06 0.08 0.10 0.12 0.14 0.16 0.18 80 100 120 140 160 180 200 Figure 17. Pre−Charge Current (IPCHG) vs. Current Select Resistor (RISEL) RISEL (kW) CTIME Selection for Programming Charge Time The NCP1835 offers an end−of−charge timeout timer to prevent the battery from continuously charging which can cause premature aging or safety issues. The timing capacitor between TIMER pin and ground, CTIME, sets the end−of−charge time, TIMEOUT, and the pre−charge timeout. This capacitor is required for proper device operation. The internal oscillator charges CTIME to 1.2 V and then discharges it to 0.6 V with 6 mA current in one period. Therefore, the period of the oscillator is: TOSC + 2 CTIME dVc IC + 0.2 106 CTIME (sec) (eq. 2) A 22−binary counter counts every oscillator period until it reaches the maximum number corresponding to end−of−charge time, TIMEOUT. TIMEOUT + 222 TOSC + 14 CTIME 1nF (minute) (eq. 3) The NCP1835 will terminate charging and give a timeout signal if the battery has not completed charging within the TIMEOUT period. The timeout signal then forces the FAULT pin low. |
Similar Part No. - NCP1835MN24T2 |
|
Similar Description - NCP1835MN24T2 |
|
|
|
Link URL |
| Privacy Policy |
| ALLDATASHEET.NET |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | 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 |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
