参数资料
| 型号： | 70IMX7-15-15-9 |
| 厂商： | Power-One |
| 文件页数： | 10/14页 |
| 文件大小： | 0K |
| 描述： | CONVERT DC/DC 2X 15V 7W |
| 标准包装： | 2 |
| 系列： | * |
IMX7, IMS7 Series Data Sheet
?
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.
06029e
7-Watt DC-DC Converters
100 to 105% V o nom . R ext should be connected between pin
4 and Vi –. The following table indicates suitable resistor
values for typical output voltages under nominal
conditions ( V i nom , I o = 0.5 I o nom ), with paralleled outputs or
equal load conditions on each output.
Caution: Connection of R ext to Vi+ may damage the converter.
Vi+
Vo+
06089a
V ref = 2.5 V
+
4 k ?
R
R ext2
+
Vi+
Trim
Vo1+
Vo1–
Vi–
Control
logic
Vo–
R ext1
–
V ext
+
–
V ext
R ext
Vi–
Control
circuit
V ref 2.5 V
Vo2+
Vo2–
Fig. 12
Output voltage adjust for single-output models
Fig. 13
Output voltage adjust for double-output models
a) Adjustment by means of an external resistor:
R ext1 ≈ 4 k ? ? ––––– o ––––
Depending upon the value of the required output voltage,
a resistor R ext1 or R ext2 shall be connected as shown in the
figure below:
Either: R ext1 between the R pin and Vo– to achieve an
output voltage adjustment range of V o = 75 to 100% of
V o nom (85 to 100% for 3.3 V outputs):
V
V o nom – V o
Table 6: R ext for V o > V o nom
approximate values (V i nom , I o1 = I o2 = 0.5 I o1/2 nom )
V o [% V o nom ] R ext [ k ? ]
105 to 108 (107 typically) 0
105 1.5
104 5.6
103 12
102 27
or: R ext2 between the R pin and Vo+ to achieve an output
voltage range of approximately V o = 100 to 105 % of V o nom :
101
100
68
∞
R ext2 ≈ 4 k ? ? ––––––––––––––––––
V ext ≈ ––––––––
( V o –2.5V)
2.5 V ? ( V o / V o nom – 1)
b) Adjustment by means of an external voltage V ext 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 V o nom .
V o ? 2.5 V
V o 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).
Double-output models with Trim input:
Note: Applying a control voltage greater than 20 V will set the
converter into a hiccup mode.
b) Adjustment by means of an external voltage source V ext .
For external output voltages in the range of 75 to 105% of
V o nom a voltage source V ext (0 to 20 V) is required,
connected to the Trim-input (pin 4) and Vi –. The table
below indicates typical V o versus V ext values under
nominal conditions ( V i nom , I o = 0.5 I o nom ), with paralleled
outputs or equal load conditions on each output. Direct
paralleling of the Trim-inputs of converters connected in
parallel is feasible.
Table 7: V ext for V o = 75 to 105% V o nom ;
typical values (V i nom , I o1 = I o2 = 0.5 I o1/2 nom )
The Trim input (pin 4) of double-output models is referenced
to the primary side. The figure 15 shows the circuitry.
Adjustment of the output voltage is possible in the range of
100 to 105% of V o nom using an external resistor, or in the range
of 75 to 105% of V o nom using an external voltage source.
a) Adjustment by means of an external resistor R ext .
Programming of the output voltage by means of an
external resistor R ext1 is possible within a limited range of
V o [% V o nom ]
≥ 105
102
95
85
75
V ext [V]
0
1.6
4.5
9
13
BCD20007-G Rev AE, 14-May-2012
Page 10 of 14
www.power-one.com
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