 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
LTC4269-1 Datasheet(PDF) 9 Page - Linear Technology |
|
||||||||||||||||||||||||||||||
LTC4269-1 Datasheet(HTML) 9 Page - Linear Technology |
|
|
9 / 44 page  LTC4269-1 9 42691fb TEMPERATURE (°C) –50 330 25 42691 G28 300 280 –25 0 50 270 260 340 320 310 290 75 100 125 RtON(MIN) = 158k TEMPERATURE (°C) –50 0 50 150 200 250 0 50 75 42691 G29 100 –25 25 100 125 300 RPGDLY = 16.9k RPGDLY = 27.4k TEMPERATURE (°C) –50 285 305 325 25 75 42691 G30 265 245 –25 0 50 100 125 225 205 RENDLY = 90k TYPICAL PERFORMANCE CHARACTERISTICS Minimum PG On-Time vs Temperature PG Delay Time vs Temperature Enable Delay Time vs Temperature PIN FUNCTIONS SHDN (Pin 1): Shutdown Input. Use this pin for auxiliary power application. Drive SHDN high to disable LTC4269-1 operation and corrupt the signature resistance. If unused, tie SHDN to VPORTN. T2P(Pin2):Type2PSEIndicator,Open-Drain.Lowimped- ance indicates the presence of a Type 2 PSE. RCLASS (Pin 3): Class Select Input. Connect a resistor between RCLASS and VPORTN to set the classification load current (see Table 2). NC (Pins 4, 7, 8, 25, 28, 31): No Connect. VPORTN (Pins 5, 6): Input Voltage, Negative Rail. Pin 5 and Pin 6 must be electrically tied together at the package. SG (Pin 9): Synchronous Gate Drive Output. This pin provides an output signal for a secondary-side synchro- nous rectifier. Large dynamic currents may flow during voltage transitions. See the Applications Information section for details. VCC (Pin 10): Supply Voltage Pin. Bypass this pin to GND with a 4.7μF, or more, capacitor. This pin has a 19.5V clamp to ground. VCC has an undervoltage lockout func- tion that turns the part on when VCC is approximately 15.3V and off at 9.7V. In a conventional trickle-charge bootstrapped configuration, the VCC supply current increases significantly during turn-on causing a benign relaxation oscillation action on the VCC pin if the part does not start normally. tON (Pin 11): Pin for external programming resistor to set the minimum time that the primary switch is on for each cycle. Minimum turn-on facilitates the isolated feed- back method. See the Applications Information section for details. ENDLY (Pin 12): Pin for external programming resistor to set enable delay time. The enable delay time disables the feedback amplifier for a fixed time after the turn-off of the primary-side MOSFET. This allows the leakage inductance voltage spike to be ignored for flyback voltage sensing. See the Applications Information section for details. SYNC (Pin 13): External Sync Input. This pin is used to synchronize the internal oscillator with an external clock. The positive edge of the clock causes the oscillator to discharge causing PG to go low (off) and SG high (on). The sync threshold is typically 1.5V. Tie to ground if unused. See the Applications Information section for details. SFST (Pin 14): Soft-Start. This pin, in conjunction with a capacitor (CSFST) to GND, controls the ramp-up of peak primary current through the sense resistor. It is also used to control converter inrush at start-up. The SFST clamps |
Similar Part No. - LTC4269-1 |
|
Similar Description - LTC4269-1 |
|
|
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
