PSU TPMP1470 2 amp buck regulator

This board offers a 2 amp buck (step-down) point-of-load switch-mode regulator.

Features:

1. Wide 3.5 to 18VDC input voltage range
2. Output adjustable from 1.2 to 15VDC
3. 600KHz switching freq.
4. 2 amp output capability (with adequate heatsinking)
5. Dimensions: approx. 23 x 10.2 x 5.3 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=178K

12V       R3=140K

9V        R3=103K

5V        R3=56K

3V3       R3=31K3

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

INPUT VOLTAGE RANGE=3.5  to 18VDC

OUTPUT VOLTAGE RANGE=1.2  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 (Bourns 3224W) BETWEEN

P4 PIN 3 AND P3 PIN 3

N.B. P1 PIN 2 CAN BE USED AS EXTRA 0V (THUS LOWER GROUND IMPEDANCE) AND MECHANICAL BONDING

WHEN THIS BOARD IS USED AS A 78XX RETROFIT/ENHANCEMENT. WE SUGGEST USING 16 OR 18 GAUGE BTCW..

THIS WILL ALSO ENHANCE THERMAL DISSIPATION SOMEWHAT.