5
dc2117af
DEMO MANUAL DC2117A
eXtV
cc
Bias supply
By default, the DC2117A EXTV
CC
turret is tied to the 12V
V
OUT
to save IC power loss.
To power the EXTV
CC
from onboard bias supply:
1. Leave the JP7 OPEN. This step disconnects the EXTV
CC
from V
OUT
.
2. Keep the JP8 at the ON position. The onboard BIAS
supply output voltage is 12V.
Alternatively, EXTV
CC
can also be powered by an external
power supply:
1. Leave the JP7 OPEN.
2. Keep the JP8 at the OFF position.
3. Apply a DC voltage (<14V) between the EXTV
CC
and
GND turret, after the input voltage is established. Ensure
that EXTV
CC
≤ V
IN
.
Figure 3. DC2117A V
OUT
Typical Efficiency vs Load Current
I
OUT
(A)
0
EFFICIENCY (%)
100
95
85
75
90
80
70
65
60
55
50
3.5
2.5
4.5
DC2117a F03
5
3
0.5
1
1.5
2
4
V
IN
= 48V
V
IN
= 130V
V
IN
= 72V