PSU MP1484 3 amp buck regulator

This board offers a 3 amp buck (step-down) point-of-load switch-mode regulator.

Features:

1. Wide 4.75 to 18VDC input voltage range
2. Output adjustable from 0.93 to 15VDC
3. 340KHz switching freq.
4. 3 amp output capability (with adequate heatsinking)
5. Dimensions: approx. 23 x 10.2 x 6.5 mm (L x W x H).
6. Ideal for use with solderless breadboard mounting.
7. Has a form-factor similar to a 78XX linear regulator
8. Shipped with snap-off pins unfitted…need soldering.
9. Made in England.

PINOUTS:-

P2                              P1

1 +Vin                         1 EN

2 0V                            2 0V

3 +Vout                      3 FB

(the FB pin can be used to connect an external voltage feedback circuit)

TP1 can connect using 14 or 16 gauge bare tinned-copper wire (BTCW)

To provide extra grounding and thermal bonding to a pre-existing mounting

Hole (assuming this board replaces a78XX linear regulator)

TO CALCULATE R3 VALUES FOR OTHER DESIRED VOUT

VOLTAGES….

R3(K) =((Vout/0.925) -1) x 10    E.G for….

15V       R3=152K

12V       R3=119.7K

9V        R3=87.3K

5V        R3=44.2K

3V3       R3=25K7

( use nearest preferred value 0.1% resistor or compromise on accuracy)

INPUT VOLTAGE RANGE=4.75  to 18VDC

OUTPUT VOLTAGE RANGE=0.93  to 15VDC

N.B. The EN line should be driven from an open collector, open-drain

or switch closure to ground (low=disable).

N.B. UNIT IS NORMALLY SUPPLIED WITH R3 VALUES AS ABOVE.

FOR VARIABLE VOLTAGE, REMOVE R3 AND FIT EXTERNAL 200K

MULTI-TURN  PRESET BETWEEN

P4 PIN 3 AND P3 PIN 3