BQ2001-7R POWER ONE, BQ2001-7R Datasheet - Page 13

• Manufacturer Part Number: BQ2001-7R
• Manufacturer: POWER ONE
• Type: Step Downr

Specifications of BQ2001-7R

• Output Current: 15A
• Input Voltage: 14.4 to 36V
• Output Voltage: 5.1V
• Output Power: 97
• Screening Level: Commercial
• Operating Temperature Min Deg. C: -25C
• Operating Temperature Max Deg. C: 71C
• Product Length (mm): 164mm
• Product Depth (mm): 111mm
• Product Height (mm): 19.8mm
• Mounting Style: Screw
• Pin Count: 15
• Number Of Outputs: 2
• Lead Free Status / RoHS Status: Not Compliant

BCD20011-G Rev AD, 22-Dec-09
Redundant Configuration
Fig. 10a shows a circuit with ORing diodes D
output lines, forming a redundant configuration. For accurate
output voltage regulation, the sense lines are connected after
the ORing diodes. The T pins should be connected together to
Fig. 10a
Simple redundant configuration of double-output models with
parallel-connected outputs.
Fig. 10b
Redundant configuration of double-output models with
parallel-connected outputs.
–
–
+
+
+
+
R
R
p
p
i
i
Out OK+
Out OK–
i
Vi+
Vi–
Out OK+
Out OK–
i
Vi+
Vi–
Out OK+
Out OK–
i
Vi+
Vi–
Out OK+
Out OK–
i
Vi+
Vi–
Vo+/Vo1+
Vo+/Vo2+
®
Vo–/Vo1–
Vo–/Vo2–
Vo+/Vo1+
Vo–/Vo1–
Vo+/Vo2+
Vo–/Vo2–
Vo+/Vo1+
Vo+/Vo2+
Vo+/Vo1+
Vo+/Vo2+
Vo–/Vo1–
Vo–/Vo2–
Vo–/Vo1–
Vo–/Vo2–
05091b
06097b
S+
S–
S+
S–
S+
S+
S–
S–
T
T
T
T
D
R
S
S
R
R
D
S
in the positive
S
D
D
D
D
R
R
R
R
Page 13 of 26
produce reasonable current sharing between the parallel-
connected converters.
If one of the converters fails, the remaining converters can
deliver the whole output power.
Fig. 10b shows a quite similar circuit with ORing diodes D
with different output loads. To compensate for the voltage drop
of the ORing diodes (if necessary), an auxiliary circuit is added
to each power supply consisting of a small diode D
small resistor R
mA through D
supply voltage.
The current sharing may be improved by interconnecting the T
pins of the converters. This circuit is a bit less accurate, but
more flexible and less sensitive.
Output Voltage Regulation
The dynamic load regulation is shown in the figure below.
Fig. 11
Deviation of V
The static load regulation measured at the sense pins is
negligible. Correct connection of the sense lines almost
eliminates any load regulation; see Sense Lines.
In a symmetrical configuration the output 1 with open R input is
regulated to V
load on output 2 is too small (<10% of I
and may activate the overvoltage protection, which will then
reduce the voltage on both outputs.
V
with at least 10% of I
±5% of V
different load distributions up to the current limit. If I
the two outputs are connected in series, the deviation of V
remains within ±1% of the value of V
load is at least I
o2
Note: The current-share logic can only increase the output voltage
marginally and remains functional even in the case of a failing
converter.
Caution: Do not connect the sense lines after the ORing diodes,
but directly with the respective outputs. If for some reason one of
the converters switches off and the ORing diode is blocking, a
reverse voltage can appear between the sense pin and the
respective output pin and damage the converter.
depends upon the load distribution: If each output is loaded
0.5
I
V
o
/I
o
1
0
o nom
o nom
≥ 10 µs
V
66 – 132 Watt DC-DC Converter
od
S
. The following figures explain the regulation with
o
o1 nom
S
versus dynamic load change
and R
o min
. We recommend a current of approximately 10
.
, regardless of the output currents. If the
t
d
o nom
S
. Only Load 0 benefits from a secured
, the deviation of V
V
Q Series Data Sheet
V
od
o
±1%
≥ 10 µs
o nom
o nom
t
d
), its voltage will rise
, provided that the
www.power-one.com
o2
05102c
remains within
V
o
o1
±1%
t
t
S
= I
and a
R
o2
, but
or
o2