 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
LT3420EMS Datasheet(PDF) 6 Page - Linear Technology |
|
||||||||||||||||||||||||||||||
LT3420EMS Datasheet(HTML) 6 Page - Linear Technology |
|
|
6 / 20 page  LT3420/LT3420-1 6 3420fa PI FU CTIO S RREF (Pin 1): Reference Resistor Pin. Place a resistor (R2) from the RREF pin to GND. 2k is recommended. VBAT (Pin 2): Battery Voltage Input. This pin should be connected to the power supply or battery, which supplies power to transformer T1. Must be locally bypassed. RFB (Pin 3): Feedback Resistor Pin. Place a resistor (R1) from the SW pin to the RFB pin. Set R1 according to the following formula: R R N RN V V SEC OUT D 1 2 14 2 2 =+ + [] (. • ) ( ) (LT3420) R R N RN V V SEC OUT D 1 2 2 2 =+ + [] () ( ) (LT3420-1) VOUT : Desired Output Voltage N: Transformer Turns Ratio RSEC: Transformer Secondary Resistance VD: Diode Forward Voltage Drop R2: Resistor from the RREF Pin to GND. 2k is a Typical Choice VCC (Pin 4): Input Supply Pin. Must be locally bypassed with a 4.7 µF or larger ceramic capacitor. GND (Pin 5): Ground. Tie directly to local ground plane. SW (Pin 6): Switch Pin. This is the collector of the internal NPN power switch. Minimize the metal trace area con- nected to this pin to minimize EMI. SEC (Pin 7): Transformer Secondary Pin. Tie one end of the transformer secondary to this pin. Take care to use the correct phasing of the transformer (Refer to Figures 1 and 2). DONE (Pin 8): Done Output Pin. Open collector NPN output. DONE is pulled low whenever the chip is delivering power to the output and goes high when power delivery stops. CHARGE (Pin 9): Charge Pin. Drive CHARGE high (1.5V or more) to commence charging of the output capacitor. Drive to 0.2V or less to put the part in shutdown mode. CT (Pin 10): Refresh Timer Capacitor Pin. Place a capacitor from the CT pin to GND to set the refresh timer sample rate according to the following formula: CT = 2.5 • 10–6 • tREFRESH tREFRESH: Desired Refresh Period in Seconds. |
Similar Part No. - LT3420EMS |
|
Similar Description - LT3420EMS |
|
|
|
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
