Diodes PAM2316 - Manual (Page 9)

PAM2316
Document number: DSxxxxx Rev. 1 - 1
9 of 11
www.diodes.com
November 2012
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PAM2316
A Product Line of
Diodes Incorporated
Application Information
(cont.)
Short Circuit Protection
When the converter output is shorted or the device is overloaded, each high-side MOSFET current-limit event (3A typ) turns off the high-side
MOSFET and turns on the low-side MOSFET. An internal counter is used to count the each current-limit event. The counter is reset after
consecutive high-side MOSFETs turn on without reaching cur rent l imi t. I f the current- limit condition persists, the counter fills up. The control
logic then stops both high-side and lowside MOSFETs and waits for a hiccup period, before attemping a new soft-start sequence. The counter
bits is decided by V
FB
voltage. If V
FB
≤ 0 2, the counter is 3-bit counter; if V
FB
> 0.2 the counter is 6-bit counter. The typical hicuup made duty
cycle is 1.7%. The hicuup mode is disable during soft-start time.
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 PAM2316. Check the following
in your layout:
1. The input capacitor should be close to IC as close as possible.
2. Must put a small decoupling capacitor between V
IN
Pin and AGND Pin.
3. Minimize the switching loop area to avoid excessive switching noise.
4. AGND and PGND should connect at input capacitor GND.
5. For the good thermal dissipation, PAM2316 has a heat dissipate pad in the bottom side, it should be soldered to PCB surface. For the copper
area can't be large in the component side, so we can use mu ltiple vias connect to other side of the PCB.
Ordering Information
Part Number Output Voltage Part Type Standard Package
PAM2316AGCADJ CHVYW T-DFN22-8 3000 Units/Tape & Reel
Marking Information