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參數(shù)資料
| 型號： | 48IMS25-15-9 |
| 元件分類： | 電源模塊 |
| 英文描述： | 1-OUTPUT 24 W DC-DC REG PWR SUPPLY MODULE |
| 文件頁數(shù)： | 8/11頁 |
| 文件大?。?/td> | 225K |
| 代理商： | 48IMS25-15-9 |
Board Mountable
DC-DC Converters
IMS 25 Series
Edition 2/4.2000
6/11
Table 6: Typical values for undervoltage lockout (PUL)
settings.
24 IMS 25
48 IMS 25
Rext [k]
Ui min [V]
Rext [k]
Ui min [V]
∞
13.5
∞
31
250
15
50
34
100
16
29
36
60
17
20
38
30
18
15
40
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
pin should be left open-circuit.
Vo+
Vi+
Vi–
Vo–
06133
R
ext
SD
Synchronisation
The IMS 25 features a bi-directional synchronisation func-
tion to synchronise several IMS 25 units operated in parallel
connection. When the W pins (SYNC) are connected to-
gether, the converters will lock to the highest switching fre-
quency. External synchronization with a TTL compatible
signal of 270...300 kHz pulse 10...90% is also possible.
Adjustable Output Voltage
As a standard feature, the IMS 25 units offer adjustable out-
put voltage by using the secondary referenced Trim input. If
the Trim input is left open-circuit the output voltage is set to
Uo nom. Adjustment of the output voltage is possible by
means of an external resistor
Rext connected between the
Trim pin and the either Vo+ or Vo–.
Uo nom
Uo
tstart up
trise
t
04008
Fig. 7
Converter start-up and rise time (applying Ui nom).
Converter operating:
2.0...5.5 V
Converter shut down:
–10...0.7 V
The shut down pin can also be used as a programmable
undervoltage lockout. The undervoltage lockout values for
the 24 IMS and 48 IMS series are 14 and 31 V respectively
with a 0.5 V hysteresis window. These factory settings can
be trimmed up by means of an external resistor connected
between the SD pin and Vi– pin.
Fig. 8
Shut down (SD) and undervoltage lockout (PUL) function.
Vo+
Vi+
Vi–
Vo–
06134
Trim
R
ext 1
R
ext 2
Fig. 9
Output voltage Trim.
Table 7: Uo versus Uext for Uo = 80...105% Uo nom;
typical values (Ui nom, Io1/2 = 0.5 Io1/2 nom)
Rext 1
Rext 2
Uo nom [V]
Uo [V]
[k
]
Uo [V]
[k
]
2.5
2
1.7
2.5
∞
2.25
8
2.63
18
2.75
9
3.3
2.46
2.1
3.3
∞
2.97
8
3.47
11
3.63
5
5.1
4.08
1.3
5.1
∞
4.59
3.5
5.36
10
5.61
5
12
9.6
10
12
∞
10.8
25
12.6
15
13.2
7
15
12
15
∞
13.5
35
15.75
15
16.5
7
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