Electronic Components Datasheet Search |
|
SEA05 Datasheet(PDF) 5 Page - STMicroelectronics |
|
SEA05 Datasheet(HTML) 5 Page - STMicroelectronics |
5 / 10 page SEA05 Application information Doc ID 17014 Rev 1 5/10 5 Application information Figure 4. Application information Note: A 15 Ω resistor in series to Ictrl pin helps to protect the IC in case of negative voltage that exceed the AMR of Ictrl pin. As example a potential dangerous phenomenon could happen during converter output short-circuit. Consider the steady state operation of the circuit during voltage mode regulation (i.e. the output is at its nominal voltage). The output capacitor is fully charged at Vo. If an abrupt short (i.e. with negligible impedance) is applied at the output, instantly the positive pin of the electrolytic capacitor is connected to the SEA05 ground. Since the capacitor acts like a battery, all its voltage is applied across the Rsense pin and therefore the Ictrl pin is pulled down to –Vo. This could damage the IC in case the Ictrl pin AMR is violated. In reality the short is not so severe because it has a some impedance, the electrolytic capacitor has an ESR and it starts discharging as soon as the short is applied. The Ictrl pin is brought to a negative voltage anyway. The pin internal structure has been design to be robust against negative voltage but, since the severity of this phenomenon is proportional to the output voltage, for some applications an external resistor in series with Ictrl pin helps protect the IC. The resistor added in series with Ictrl pin introduces an error in the current sense threshold voltage. This error can be calculated considering the Ictrl pin current: this current multiplied by the value of the external resistor gives the current sense threshold variation. As example if we add a 15 Ω resistor in series to Ictrl pin, we have Ictrl current = Ibias = 6 µA and therefore the error 6 µA x 15 Ω = 80 µV, the error is 80 µV / 50 mV = 0.16% |
Similar Part No. - SEA05 |
|
Similar Description - SEA05 |
|
|
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 |