Linear Technology DC1185B-A Demo Manual page 3

QUICK START PROCEDURE
2.0V/10A and 1.8V/10A Efficiency at V
95
90
85
80
QTOP: RJK030DPB
QBOTTOM: RJK0330DPB
75
L: TOKO FDU0650-R56M = P3
0.56µH, DCR = 2.45m , 3.2m MAX
R = 3m
SENSE
70
0 2 4
LOAD CURRENT (A)
Figure 3. Efficiency Curves for the DC1185B-A
SINGLE OUTPUT/DUAL PHASE OPERATION
A single output/dual phase converter may be preferred
for high output current applications. The benefits of
single output/dual phase operation is lower ripple current
through the input and output capacitors, improved load
step response and simplified thermal design. To implement
single output/dual phase operation, make the following
modifications:
1. Tie VOUT1 to VOUT2 by tying together the exposed
copper pads near J3 and J5 at the edge of the board.
Use a piece of heavy copper foil.
+
VOUT
Figure 2. Measuring Output Voltage Ripple
= 12V and f = 500kHz
IN SW
2.0V
1.8V
6 8 10 12
-
COUT
GND
1.5V/15A and 1.2V/15A Efficiency at V
95
90
85
80
75
70
0 3
Figure 4. Efficiency Curves for the DC1185B-B
2. Tie ITH1 to ITH2 by stuffing 0Ω at R49.
3. Tie VFB1 to VFB2 by stuffing 0Ω at R50.
4. Tie TRK/SS1 to TRK/SS2 by stuffing 0Ω at R52.
5. Tie RUN1 to RUN2 by stuffing 0Ω at R55.
6. Remove the redundant ITH compensation network and
VFB divider.
DEMO MANUAL
DC1185B-A/-B
= 12V and f
IN SW
1.5V
1.2V
QTOP: RJK030DPB
QBOTTOM: RJK0330DPB
L: VITEC 59PR9875
0.4µH, DCR = 0.47m ±10%
R = 2m
SENSE
6 9 12 15 18
LOAD CURRENT (A)
= 400kHz
dc1185b-a/-bf
3