EQ2660-9R Datasheet, PDF (5/26 Pages) Power-One – Q Series Data Sheet 66 – 132 Watt DC-DC Converters

Q Series Data Sheet
®
66 – 132 Watt DC-DC Converters
Functional Description
The converters are designed as forward converters using
primary and secondary control circuits in SMD technology. The
switching frequency is approximately 200 kHz under nominal
operating conditions. The built-in high-efficient input filter
together with a small input capacitance generate very low
inrush currents of short duration. After transformer isolation
and rectification, the output filter reduces ripple and noise to a
minimum without compromising the dynamic ability. The
output voltage is fed to the secondary control circuit via
separate sense lines. The resultant error signal is sent to the
primary control circuit via a signal transformer.
Double-output models have the voltage regulation of output 2
relying on the close magnetic coupling of the transformer and
the output inductor together with the circuits' symmetry.
The current limitation is located at the primary side, thus
limiting the total output current in overload conditions. This
allows flexible loading of each output for unsymmetrical loads
in the range 10 to 90% of the total output power. In applications
with large dynamic load changes, we recommend connecting
such a load to output 1. If output 2 is not used, it should be
connected parallel to output 1. Both outputs can either be
series- or parallel-connected (see Electrical Output Data).
In normal operation, the internal control circuits are powered
by a third winding of the main choke (except 48 Q models).
Start-up is ensured from the input voltage by a linear regulator.
Note: When the output voltage is much lower then the nominal
value, this linear regulator is activated, generating considerable
power losses.
03111a
2
i 28
Primary
control circuit
Output
monitor
Output
control
22 Out OK+
24 Out OK–
18 T
16 R³
12 S+¹
Vi+ 30
4 Vo+
Vi– 32
Fuse
1
26
Input
filter
C_y
Isolation
Output
filter
C_y
6 Vo+
8 Vo–
10 Vo–
14 S–¹
20
4
Fig. 6
1 _{Leading pins} 2 _{Potentiometer for option P} 3 _{Do not connect for models xQ1101 or with option P} 4 _{Do not connect}
Block diagram of a single-output converter
i 28
Primary
control circuit
2
Output
monitor V_o2
Output
control
03112a
22 Out OK+
24 Out OK–
18 T
16 _R3
Vi+ 30
Vi– 32
Fuse
1
26
Input
filter
C_y
Isolation
Output
filter
Output
filter
C_y
Fig. 7
1 _{Leading pins} 2 _{Potentiometer for option P} 3 _{Do not connect for models with option P}
Block diagram of a double-output converter
6 Vo2+
10 Vo2–
12 S+¹
4 Vo1+
8 Vo1–
14 S–¹
20
4
4 _{Do not connect}
BCD20011- G Rev AG, 12-Mar-2012
Page 5 of 26
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