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參數(shù)資料
| 型號(hào)： | 40IMX35-05-05-8Z |
| 元件分類： | 電源模塊 |
| 英文描述： | 2-OUTPUT 35 W DC-DC REG PWR SUPPLY MODULE |
| 文件頁(yè)數(shù)： | 3/18頁(yè) |
| 文件大?。?/td> | 320K |
| 代理商： | 40IMX35-05-05-8Z |
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Board Mountable
DC-DC Converters
IMX 35 Series
Edition 1/01.2001
11/18
Vo1+
Vi+
Vi–
Vo1–
06136
Trim1
R
ext1
R
ext2
4
PUL
1
2
17
18
15
RPUL
Fig. 15
Input undervoltage lockout adjustment (PUL) and output
voltage adjustment by use of the Trim1 input referenced
to the secondary side (triple output units).
Table 9: Uo1 versus Rext for Uo1 = 80...105% Uo nom; typical
values (Ui nom, Io1/2 = 0.5 Io1/2 nom); triple output units
Uo nom
Rext1
Rext2
[V]
Uo1 [V]
[k
]
Uo1 [V]
[k
]
3.3
2.8
0.75
3.3
∞
2.97
1.8
3.4
5.6
3.135
4.7
3.46
3.3
5.1
5.0
33
5.1
∞
4.84
9.1
5.36
3
4.59
2.2
5.25
8.5
Trim
Vo1+
Vo2–
+
U
ext
–
Vi+
Vi–
R
ext
Vo1–
Vo2+
06137
Control
circuit
Uref = 2.5 V
4
5
2
17
15
13
11
>7 k
Trim 1/4
Fig. 16
Output voltage control for double and quad output units by
means of the Trim input on the primary side.
Auxiliary Functions
Adjustable Output Voltage
As a standard feature, the IMX 35 offer adjustable output
voltages in the range 80...105% of
Uo nom by use of a con-
trol pin. The Trim control is offered either on primary or sec-
ondary side of the converter depending on type.
The double output units IMX 35-05-05, IMX 35-12-12 and
IMX 35-15-15 have a Trim input connected to pin 5. This in-
put influences both outputs simultaneously. Both power
trains have passive transformer feedback and the Trim in-
put (pin 5) is referenced to the primary side. Fig. 16 shows
the circuit topology. Adjustment of the output voltage is pos-
sible by means of either an external resistor
Rext in the
range of 100...105% of
Uo nom (table 10) or an external volt-
age source in the range of 80...105% of
Uo nom (table 11).
The IMX 35 triple output units feature a first power train with
magnetic feedback. The simplified circuit is shown in
Fig. 15. The Trim1 (pin 18) is secondary referenced and in-
fluences only the first power train. Adjustment of the output
voltage is possible by means of an external resistor
Rext
between the Trim1 and either Vo1+ or Vo1–. If the Trim1
input is left open-circuit, the output voltage is set to
Uo1 nom.
Table 9 states typical values required to program the output
voltage
Uo1 to approximately the values as indicated.
a) Adjustment by means of an external resistor
Rext:
Adjustment of the output voltage by means of an external
resistor
Rext is possible within the range of 100...105% of
Uo nom. Rext should be connected between the Trim pin 5
and Vi–. Connection of
Rext to Vi+ may damage the con-
verter. Table 10 indicates suitable resistor values for typi-
cal output voltages under nominal conditions (
Ui nom, Io =
0.5
Io nom).
b) Adjustment by means of an external voltage source
Uext
(Fig. 16):
For external output voltage adjustment in the range
80...105% of
Uo nom a (0...15 V) source Uext is required,
connected to the Trim pin 5 and Vi–. Table 11 below indi-
cates typical
Uo versus Uext values. Applying a control
voltage greater 15 V will set the converter into a hiccup
mode. Direct paralleling of the Trim pins of units of the
same type connected in parallel is feasible. (Input resis-
tor of the Trim input is >7 k
)
Table 10: Rext1 for Uo > Uo nom;
approximate values (Ui nom, Io = 0.5 Io nom)
Uo
Rext
[%
Uo nom]
Trim [k
]
Trim1/ 4 [k
]
105...108 (107 typically)
0
105
2.0
4.3
104
4.2
9.0
103
8.2
18
102
16
33
101
47
91
100
∞∞
Table 11: Uo versus Uext for Uo = 80...105% Uo nom;
typical values (Ui nom, Io = 0.5 Io nom)
Uo
Uext
[%
Uo nom]
Trim [V]
Trim1/ 4 [V]
≥105
0
102
1.6
1.5
100
2.5
95
4.25
85
8.45
8.25
80
10.5
10.2
The quad output units are shown in block diagram 3. All
types with equal output voltage have the Trim function con-
nected to pin 5 referenced to the primary side which influ-
ences all outputs simultaneously. The schematics are
shown in fig. 16, the values of the adjust resistor
Rext in Ta-
ble 10 and the external voltage source in Table 11.
The quad output unit with unequal output voltages have the
Trim1 input (pin 5) referenced to the primary side influenc-
ing only the output of the first power train (
Uo1, Uo4).
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