EQ2660-9R Datasheet, PDF (14/26 Pages) Power-One – Q Series Data Sheet 66 – 132 Watt DC-DC Converters

Q Series Data Sheet
®
66 – 132 Watt DC-DC Converters
Note: If output 2 is not used, we recommend to connect it in
parallel to Vo1. This results in improved efficiency and stability.
V_o2 [V]
V_{o2 max} = 14.2 V
V_o1 + 0.5 V
05111a
I_o1 = 7.2 A
I_o1 = 5.6 A
I_o1 = 4.0 A
I_o1 = 2.4 A
I_o1 = 0.8 A
V_o1
V_o1 – 0.5 V
I_o2 [A]
Fig. 12 ⁰
2
4
6
8 10
Double-output models with 12 V: Voltage deviation of V_o2
versus I_o2 for different currents on output 1
V_o2 [V]
V_o1 + 0.5 V
V_{o2 max} = 18 V
05112a
I_o1 = 6.0 A
I_o1 = 4.6 A
I_o1 = 3.3 A
I_o1 = 2.0 A
I_o1 = 0.66 A
V_o1
V_o1 – 0.5 V
I_o2 [A]
Fig. 13 0
2
4
6
8
Double-output models with 15 V: Voltage deviation of V_o2
versus I_o2 for different currents on output 1
V_o2 [V]
V_o1 + 1.0 V
V_{o2 max} = 28 V
05113a
I_o1 = 4.0 A
I_o1 = 3.1 A
I_o1 = 2.2 A
I_o1 = 1.3 A
I_o1 = 0.44 A
V_o1
(in double-output models, the 2^nd output is monitored). This
circuitry further protects the load in the unlikely event of a
malfunction of the main control circuit.
There is no specific built-in protection against externally
applied overvoltage.
Note: If output 2 is not loaded, the 2^nd control loop may reduce V₀₁
under boundary conditions.
Output Current Protection
All outputs are fully protected against continuous open-circuit
condition or continuous short-circuit by an electronic current
limitation located on the primary side.
Single-output models and series- or parallel-connected
double-output models have a quasi rectangular constant
current limitation characteristic.
In double-output models, only the total current is limited,
allowing free choice of load distribution between the two
outputs, up to I_o1 + I_o2 ≤ I_{o max}. However, a small current should
remain on both outputs to guarantee good voltage regulation.
In case of overload (I_o1 + I_o2 > I_{o max}) both output voltages are
reduced simultaneously.
Current distribution in overload is dependent upon the type of
overload. A short-circuit in one output will cause the full current
flow into that output, whereas a resistive overload results in
more even distribution and in a reduced output voltage.
V_o/V_{o nom}
1.0
0.95
05114c
I_{o nom} I_{o max} I_{o L}
0.5
0
I_o
Fig. 15a
BQ – GQ models: Current limitation of single- or double-output
models with series-connected outputs (no opt. B or B1)
V_o1 – 1.0 V
I_o2 [A]
Fig. 14
0
1
2
345
6
Double-output models with 24 V: Voltage deviation of V_o2
versus I_o2 for different currents on output 1
Output Overvoltage Protection
Output voltage overshoot may occur, if the converter is either
hot plugged-in or disconnected, the input voltage is switched
on or off, the converter is switched with an inhibit signal, or after
a reset of a short circuit and power failure. Output overvoltage
can also result due to incorrectly wired sense lines.
A fully independent output voltage monitor (second control
loop) limits the voltage V_o or V_o2 to approximately 1.25 • V_{o nom}
V_o/V_{o nom}
I_{o nom} I_{o L}
05104b
1.0
0.8
0.6
0.4
0.2
0
I_o/I_{o nom}
0 0.2 0.4 0.6 0.8 1.0 1.2 1.4
Fig. 15b
48Q models: Current limitation of single- or double-output
models with series-connected outputs (no opt. B or B1)
BCD20011- G Rev AG, 12-Mar-2012
Page 14 of 26
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