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70IMX7 Datasheet(PDF) 10 Page - Bel Fuse Inc. |
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70IMX7 Datasheet(HTML) 10 Page - Bel Fuse Inc. |
10 / 14 page IMX7, IMS7 Series Data Sheet 7-Watt DC-DC Converters BCD20007-G Rev AF, 31-Jul-2015 Page 10 of 14 MELCHER The Power Partners. Fig. 12 Output voltage adjust for single-output models 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. Trim Vo1+ Vo2– + V ext – Vi+ Vi– R ext Vo1– Vo2+ 06089a Control circuit V ref 2.5 V Fig. 13 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. Figure 13 shows the circuitry. 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. 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 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. 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. R Vo+ Vo– + V ext – 4 k Ω V ref = 2.5 V Control logic R ext1 R ext 2 06029e 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). Table 6: Rext for Vo > Vo nom approximate values (Vi nom, Io1 = Io2 = 0.5 Io1/2 nom) Vo [% Vo nom] Rext [kΩ Ω Ω Ω Ω] 105 to 108 (107 typically) 0 105 1.5 104 5.6 103 12 102 27 101 68 100 ∞ Note: Applying a control voltage greater than 20 V will set the converter into a hiccup mode. 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 |
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