20IMX4-12-8 Datasheet, PDF (3/12 Pages) Power-One – IMX4 Series Data Sheet 4 Watt DC-DC Converters

IMX4 Series Data Sheet
®
4 Watt DC-DC Converters
Functional Description
The IMX4 Series converters are feedback-controlled flyback
converters using current mode PWM (Pulse Width
Modulation). The input is protected against transients by
means of a suppressor diode.
The output voltage is monitored by a separate transformer
winding close to the secondary windings and fed back to the
control circuit.
Current limitation is provided by the primary circuit, thus
limiting the total output current (I_{o nom} for single- and the sum
I_{o1 nom} + I_{o2 nom} for dual-output models).
The close magnetic coupling provided by the planar
construction ensures very good regulation and allows for
flexible load distribution on dual-output models.
Vi+ 1
n.c. 2
Vi– 24
PWM
03046
13 Vo+
12 Vo–
Fig. 3
Block diagram for single-output models with alternative
pinout (option K).
Vi+ ²²
23
2
Vi– 3
PWM
03044
14 _Vo+
16 _Vo–
10
Fig. 1
Block diagram for single-output models with standard
pinout.
Vi+ ²²
23
PWM
03045
14 Vo+
16 Go
Vi+ 1
Vi– 24
PWM
03047
15 Vo+
10
Go
11
13 Vo–
Fig. 4
Block diagram for dual-output models with alternative
pinout (option K).
2
Vi– 3
11 Vo–
Fig. 2
Block diagram for dual-output models with standard
pinout.
BCD20006-G Rev AC, 06-Jul-2012
Page 3 of 12
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