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參數資料
| 型號： | 70IMX7-12-12-8 |
| 廠商： | POWER-ONE INC |
| 元件分類： | 電源模塊 |
| 英文描述： | 2-OUTPUT 7.2 W DC-DC REG PWR SUPPLY MODULE |
| 封裝： | ROHS COMPLIANT PACKAGE-9 |
| 文件頁數： | 14/14頁 |
| 文件大小： | 321K |
| 代理商： | 70IMX7-12-12-8 |
BCD20007 Rev AA
Page 9 of 14
www.power-one.com
IMX7 DC-DC Series Data Sheet
7-Watt DC-DC Converters
Fig. 14
Output voltage adjust for single-output models
Either: Rext1 between the R pin and Vo– to achieve an
output voltage adjustment range of Vo = 75 to 100% Vo nom
(85 to 100% for 3.3 V outputs):
Vo
Rext1
≈ 4 k –––––––––
Vo nom – Vo
or: Rext2 between the R pin and Vo+ to achieve an output
voltage range of approximately Vo = 100 to 105 % Vo nom:
(Vo – 2.5 V)
Rext2
≈ 4 k ––––––––––––––––––
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% 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).
R
Vo+
Vo–
+
V
ext
4 k
Vref = 2.5 V
control
circuit
Vi+
Vi–
R
ext1
R
ext 2
06029a
–
+
–
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 circuit topology.
Adjustment of the output voltage is possible in the range of 100
to 105% Vo nom using an external resistor, or in the range of 75 to
105% Vo nom using an external voltage source.
Trim
Vo1+
Vo2–
+
V
ext
–
Vi+
Vi–
R
ext
Vo1–
Vo2+
06089a
Control
circuit
Vref =2.5 V
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.
b) Adjustment by means of an external voltage source Vext.
For external output voltages in the range of 75 to 105%
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.
Fig. 15
Output voltage adjust for double-output models
Table 6: Rext for Vo > Vo nom
approximate values (Vi nom, Io1, 2 = 0.5 Io1/2 nom)
Vo [% Vo nom]
Rext [ kW]
105 to 108 (107 typically)
0
105
1.5
104
5.6
103
12
102
27
101
68
100
∞
Table 7: Vext for Vo = 75 to 105% Vo nom;
typical values (Vi nom, Io1, 2 = 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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