EQ2320-7R POWER ONE, EQ2320-7R Datasheet - Page 7

• Manufacturer Part Number: EQ2320-7R
• Description: DC/DC Power Supply Dual-OUT 12V 9.2A 120W 15-Pin
• Manufacturer: POWER ONE
• Type: Step Downr

Specifications of EQ2320-7R

• Output Current: 9.2 A
• Output Voltage: 12 V
• Input Voltage: 65 to 150 V
• Number Of Outputs: 2
• Output Power: 120 W

BCD20011-G Rev AD, 22-Dec-09
Input Transient Protection
A metal oxide VDR (Voltage Dependent Resistor) together with
the input fuse and a symmetrical input filter form an effective
protection against high input transient voltages, which typically
occur in most installations, especially in battery-driven mobile
applications.
Nominal battery voltages in use are: 24, 36, 48, 60, 72, 96,
and 110 V. In most cases each nominal value is specified
in a tolerance band of –30% to +25%, with short
excursions to ±40% or even more.
In some applications, surges according to RIA 12 are
specified in addition to those defined in IEC 60571-1 or
EN 50155. The power supply must not switch off during
these surges and since their energy can practically not be
absorbed, an extremely wide input voltage range is
required. The Q Series input range has been designed
and tested to meet most of these requirements. See also
Electromagnetic Immunity.
Input Under-/Overvoltage Lockout
If the input voltage remains below approx. 0.9 V
approx. 1.1 V
disables the output(s).
Inrush Current
The inherent inrush current value is lower than specified in the
standard ETS 300132-2. The converters operate with
relatively small input capacitance resulting in low inrush
current of short duration. As a result, in a power-bus system
the converters can be hot plugged-in or disconnected causing
negligible disturbance.
Input Fuse
An incorporated fuse in series to the negative input line
protects against severe defects. The fuse is not externally
accessible. Reverse polarity at the input will cause the fuse to
blow.
Table 3: Fuse specifications
Model
BQ
GQ
CQ
48Q
DQ
EQ
Fuse type
very fast acting
very fast acting
very fast acting
very fast acting
very fast acting
very fast acting
i max
, an internally generated inhibit signal
®
Reference and rating
2× Littelfuse 251, 10 A, 125 V
2× Littelfuse 251, 7 A, 125 V
Littelfuse 251, 10 A, 125 V
Littelfuse 251, 10 A, 125 V
Littelfuse 251, 7 A, 125 V
Littelfuse 263, 5 A, 250 V
i min
or exceeds
Page 7 of 26
+
Input Stability with Long Supply Lines
If a Q Series converter is connected to the power source with
long input lines exhibiting a considerable inductance, an
additional external capacitor connected in parallel to the input
improves stability and avoids oscillations.
Actually, a Q Series converter with nominal load acts like a
negative resistor, as the input current rises when the input
voltage decreases. It tends to oscillate with a resonant
frequency determined by the line inductance L
capacitance C
The whole system is not linear at all and eludes a simple
calculation. One basic condition is given by the formula:
R
lines. If this condition is not fulfilled, the converter cannot reach
stable operating conditions. Worst case conditions are low
input voltage V
Low inductance L
input capacitor C
are given in table 4, which should allow stable operation up to
an input inductance of 2 mH.
Fig. 8
Input configuration
ext
L
ext
is the series resistor of the source voltage including input
Table 4: Recommended values for C
Model
BQ
GQ
CQ
48Q
DQ
EQ
66 – 132 Watt DC-DC Converter
R
ext
i
C
i
+ C
and high output power P
ext
ext
ext
ext
are helpful. Recommended values for C
of the input lines and a parallel connected
R
Capacitance
ext
and damped by the resistors R
Vi+
≥680 μF
≥470 μF
≥470 μF
≥470 μF
≥150 μF
Vi–
≥68 μF
<< —
V
Q Series Data Sheet
—
P
in
— • η
²
o
C
i
R
o
.
i
Voltage
www.power-one.com
ext
100 V
100 V
125 V
200 V
40 V
63 V
ex t
JM001
and the input
Vo+
Vo–
i
+ R
ext
ext
.