Pam2305, Application information – Diodes PAM2305 User Manual
Page 12
PAM2305
Document number: DSxxxxx Rev. 2 - 6
12 of 17
January 2013
© Diodes Incorporated
PAM2305
A Product Line of
Diodes Incorporated
Application Information
(cont.)
Thermal Shutdown
When the die temperature exceeds +150°C, a reset occurs and the reset remains until the temperature decrease to +120°C, at which time the
circuit can be restarted.
PCB Layout Check List
When laying out the printed circuit board, the following checklist should be used to ensure proper operation of the PAM2305. These items are
also illustrated graphically in Figure 1. Check the following in your layout:
1. The power traces, consisting of the GND trace, the SW trace and the VIN trace should be kept short, direct and wide.
2. Does the V
FB
pin connect directly to the feedback resistors? The resistive divider R1/R2 must be connected between the (+) plate of
C
OUT
and ground.
3. Does the (+) plat e of C
IN
connect to V
IN
as closely as possible? This capacitor provides the AC current to the internal power
MOSFETs.
4. Keep the switching node, SW, away from the sensitive VFB node.
5. Keep the (–) plates of C
IN
and C
OUT
as close as possible.
Figure 1. PAM2305 Suggested Layout