SNVA046E January 2002 – December 2021 LM2655
A capacitor at Ldelay provides an additional delay in enabling the undervoltage latch after the output voltage has reached 80% of its nominal. The value of the capacitor C_delay is determined by the equation:
200pF is a good start point for this component.
Component | Value | Description | Model Number |
---|---|---|---|
COUT | 150 µF, 10 V | Output Capacitor | 595D1570010 (Sprague) (Vishay) |
CIN | 180 µF/20 V | Input Capacitor | 595D1870020 (Sprague) (Vishay) |
CDELAY | 200 pF, 0805 | Delay | VJ0805Y221KXAA (Vishay) |
CBYP | 0.1 µF, 0805 | Bypass Capacitor | VJ0805Y104KXAA (Vishay) |
Css | 4.7 nF, 0805 | Soft start | VJ0805Y472KXAA (Vishay) |
Q1 | 3A, 30 V | Synchronous N-FET | IRF7413 or Si 4874 (International Rectifier or Siliconix) |
D1 | 1A, 30 V (Schottky) | Catch Diode | MBRS130L (On Semiconductor) |
LOUT | 15 µH, 3A | Power Inductor | MIDCOM DUS5121-150 |
COUT | 150 µF, 10V | Output Capacitor | 595D1570010 (Sprague) (Vishay) |
C1COMP | 4.7nF, 0805 | Compensation Capacitor | VJ0805Y472KXAA (Vishay) |
C2COMP | 100 pF, 0805 | Compensation Capacitor | VJ0805Y100KXAA (Vishay) |
CBOOT | 0.1 µF, 50 V, 0805 | Bootstrap Capacitor | VJ0805Y104KXAA (Vishay) |
RCOMP | 8.2k, 0805 | Compensation Resistor | CRCW08058251F (Dale) |
RFB1 | 15k, 0805 | Upper Feedback Resistor | CRCW08051502F (Dale) |
RFB2 | 10k, 0805 | Lower Feedback Resistor | CRCW08051002F (Dale) |
U1 | LM2655 | Voltage Regulator | LM2655 (Texas Instruments) |