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40IMX7-05-05-8 Datasheet(PDF) 10 Page - Power-One |
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40IMX7-05-05-8 Datasheet(HTML) 10 Page - Power-One |
10 / 15 page ® BCD20007-G Rev AD, 4-Nov-09 Page 10 of 15 www.power-one.com IMX7/IMS7 DC-DC Series Data Sheet 7-Watt DC-DC Converters Table 7: Vext for Vo = 75 to 105% Vo nom; typical values (Vi nom, Io1 = Io2 = 0.5 Io1/2 nom) Vo [% Vo nom] Vext [V] ≥105 0 102 1.6 95 4.5 85 9 75 13 Single-output models with R-input: The R input (pin 13) is referenced to the secondary side of the converter. Adjustment of the output voltage is possible by means of either an external resistor or a voltage source. Fig. 13 Output voltage control with external resistor R Vo+ Vo– Vi+ Vi– R ext2 R ext1 06131 Fig. 14 Output voltage adjust for single-output models R Vo+ Vo- + V ext - 4 k Ω Vref = 2.5 V Control logic R ext1 R ext 2 06029b Vi– Vi+ a) Adjustment by means of an external resistor: Depending upon the value of the required output voltage, a resistor Rext1 or Rext2 shall be connected as shown in the figure below: Either: Rext1 between the R pin and Vo– to achieve an output voltage adjustment range of Vo = 75 to 100% of Vo nom (85 to 100% for 3.3 V outputs): Vo Rext1 ≈ 4 kΩ • ––––––––– Vo nom – Vo or: Rext2 between the R pin and Vo+ to achieve an output voltage range of approximately Vo = 100 to 105 % of Vo nom: (Vo – 2.5 V) Rext2 ≈ 4 kΩ • –––––––––––––––––– 2.5 V • (Vo/Vo nom – 1) b) Adjustment by means of an external voltage Vext between Vo– and R pin. The control voltage is 1.96 to 2.62 V and allows for adjustment in the range of 75 to 105% of Vo nom. Vo • 2.5 V Vext ≈ –––––––– Vo nom Caution: Applying an external voltage >2.75 V may damage the converter. Note: Attempting to adjust the output below this range will cause the converter to shut down (hiccup mode). Trim Vo1+ Vo2– + V ext – Vi+ Vi– R ext Vo1– Vo2+ 06089a Control circuit Vref 2.5 V Fig. 15 Output voltage adjust for double-output models Double-output models with Trim input: The Trim input (pin 4) of double-output models is referenced to the primary side. The figure below shows the circuitry. a) Adjustment by means of an external resistor Rext. Programming of the output voltage by means of an external resistor Rext1 is possible within a limited range of 100 to 105% Vo nom. Rext should be connected between pin 4 and Vi –. The following table indicates suitable resistor values for typical output voltages under nominal conditions (Vi nom, Io = 0.5 Io nom), with paralleled outputs or equal load conditions on each output. Caution: Connection of Rext to Vi+ may damage the converter. Table 6: Rext for Vo > Vo nom approximate values (Vi nom, Io1 = Io2 = 0.5 Io1/2 nom) Vo [% Vo nom] Rext [k Ω Ω Ω Ω Ω] 105 to 108 (107 typically) 0 105 1.5 104 5.6 103 12 102 27 101 68 100 ∞ Adjustment of the output voltage is possible in the range of 100 to 105% of Vo nom using an external resistor, or in the range of 75 to 105% of Vo nom using an external voltage source. b) Adjustment by means of an external voltage source Vext. For external output voltages in the range of 75 to 105% of Vo nom a voltage source Vext (0 to 20 V) is required, connected to the Trim-input (pin 4) and Vi–. The table below indicates typical Vo versus Vext values under nominal conditions (Vi nom, Io = 0.5 Io nom), with paralleled outputs or equal load conditions on each output. Direct paralleling of the Trim-inputs of converters connected in parallel is feasible. Note: Applying a control voltage greater than 20 V will set the converter into a hiccup mode. |
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