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參數(shù)資料
| 型號(hào)： | 40IMX35D05D05-9IZ |
| 元件分類： | 電源模塊 |
| 英文描述： | 4-OUTPUT 35 W DC-DC REG PWR SUPPLY MODULE |
| 文件頁數(shù)： | 3/18頁 |
| 文件大?。?/td> | 375K |
| 代理商： | 40IMX35D05D05-9IZ |
Board Mountable
DC-DC Converters
IMX 35 Series
Edition 3/4.2000
11/18
Auxiliary Functions
Shut Down Function
The outputs of the converters may be enabled or disabled
by means of a logic signal (TTL, CMOS, etc.) applied to the
shut down pin. If the shut down function is not required then
it should be left open-circuit.
Converter operating:
2.0...20 V
Converter shut down:
–10...0.7 V
Programmable Input Undervoltage Lockout PUL
A special feature of these units is the accurate undervoltage
lockout protection which protects the units (and system)
from large currents caused by operation at low voltages.
This ensures easier start-up in distributed power systems.
Table 7: Turn on and turn off voltage
Type
Trigger level
Hysteresis
Units
20 IMX 35
7...8
≤0.5
V
40 IMX 35
14...15.5
≤1
See:
Electrical input data for a description of the turn on
turn off voltage levels of the various types.
The under voltage lockout levels may be programmed by
use of an external resistor to Trim up the preset levels as
indicated in the table below.
Table 8: Typical values for Rext and the respective lockout
voltage for input voltage.
20 IMX 35
40 IMX 35
Rext [k]
Umin [V]
Rext [k]
Umin [V]
36
10
27
22
18
12
10
26
12
14
0
30
∞≤8
∞≤15.5
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 input pin. The Trim control is offered either on primary or
secondary side of the converter depending on type.
For the dual output types refer to the block diagram 1.
The units IMX 35 triple output feature a first power train with
magnetic feedback and synchronous rectifier. The simpli-
fied circuit is shown in Fig. 15.
The Trim1 (pin 18) is secondary referenced and influences
only the first power train. Adjustment of the output voltage is
possible by means of an external resistor
Rext between the
Trim1 pin and either Vo1+ or Vo1–. If the control input is
left open circuit, the output voltage is set to
Uo1 nom. Table 9
lists typical values required to program the output voltage to
approximately the values of
Uo1 indicated.
Vo1+
Vi+
Vi–
Vo1–
06136
Trim1
R
ext1
R
ext2
4
2
17
18
15
Fig. 15
Output voltage control for the Trim1 input referenced to
the secondary side.
Table 9: Uo1 versus Rext for Uo1 = 80...105% Uo nom; typical
values (Ui nom, Io1/2 = 0.5 Io1/2 nom)
Uo nom
Rext1
Rext2
[V]
Uo1 [V]
[k
]
Uo1 [V]
[k
]
3.3
2.5
1.1
3.3
∞
2.46
2.1
3.47
11
2.97
8
3.673
5
5.1
3.33
0.23
5
∞
3.57
0.45
5.36
10
4.08
1.3
5.61
5
4.59
3.5
The units IMX 35-05-05, IMX 35-12-12 and IMX 35-15-15
exhibit a Trim input connected to pin 5. This input influences
both outputs simultaneously. Both power trains have pas-
sive transformer feedback and the Trim input (pin 5) is ref-
erenced to the primary side. Fig. 16 shows the circuit topol-
ogy. Adjustment of the output voltage is possible by
means of either an external resistor
Rext in the range of
100...105% of
Uo nom or an external voltage source in the
range of 80...105% of
Uo nom.
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
Fig. 16
Output voltage control for double output units by means of
the Trim input on the primary side.
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