IMX 7 DC/DC Series Data Sheet
7W Board Mountable Converter
Functional Description
In the case of the dual and double output units the output
voltage is monitored by a separate transformer winding
close to the secondary windings and fed back to the control
circuit. The R (Trim) input is referenced to the primary side
and allows programming of the output voltage in the range
100 to 105% of Vo nom by an external resistor or within 75 to
105% of Vo nom using an external voltage source.
The IMX 7 DC-DC modules are feedback controlled flyback
converters using current mode PWM (Pulse Width Modula-
tion). See block diagram for single and double output types.
In the case of the single output units the output is directly
monitored and fed back to the primary control circuit via a
pulse transformer, resulting in tight regulation of the output
voltage. The R input is referenced to the secondary side
and allows for programming of the output voltages in the
range 75 to 105% of Vo nom using either an external resistor
or an external voltage source.
Current limitation is provided by the primary circuit, thus
limiting the total output power.
The inhibit input allows remote converter on/off.
03042
03041
1
3
11
Vi+
Vo+
Vo–
1
11
Vi+
Vo1+
PWM
4
3
i
(Trim) R
i
10
13
Vo1–
Vo2+
10
12
PWM
10 nF
2 × 2200 pF
2
4
Vi–
n.c.
2
12
14
Vo2–
n.c.
Vi–
13
14
R
D
2 × 2200 pF
Fig. 1
Fig. 2
Block diagram, single output types, standard pinout
Block diagram, double output types, standard pinout
REV. OCT 01, 2003
3/15
IMX SERIES