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參數(shù)資料
| 型號： | 110IMY35D15D15-9IZ |
| 廠商： | POWER-ONE INC |
| 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)： | 15/15頁 |
| 文件大?。?/td> | 355K |
| 代理商： | 110IMY35D15D15-9IZ |
Board Mountable
DC-DC Converters
IMY 35 Series
Edition 2/5.2000
9/15
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
110 IMY 35
40...42.5
≤1V
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.
Rext [k]
Umin [V]
27
22
10
26
030
∞≤15.5
Adjustable Output Voltage
As a standard feature, the IMY 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 IMY 35-12-12 and IMY 35-15-15 exhibit a Trim
input connected to pin 5. This input influences both outputs
simultaneously. Both power trains have passive trans-
former feedback and the Trim input (pin 5) is referenced to
the primary side. Fig. 16 shows the circuit topology. Adjust-
ment 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. 14
Output voltage control for double output units by means of
the Trim input on the primary side.
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. The following table indicates suitable resistor val-
ues for typical output voltages under nominal conditions
(
Ui nom, Io = 0.5 Io nom).
b) Adjustment by means of an external voltage source
Uext.
For external output voltage adjustment in the range
80...105% of
Uo nom a (0...20 V) source Uext is required,
connected to the Trim pin 5 and Vi–. The table below indi-
cates typical
Uo versus Uext values. Applying a control
voltage 15...20 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.
Table 10: Uo versus Uext for Uo = 80...105% Uo nom;
typical values (Ui nom, Io = 0.5 Io nom)
Uo [% Uo nom]
Uext [V]
≥105
0
102
1.8
100
2.5
95
4.25
85
8.25
80
10.2
Table 9: Rext1 for Uo > Uo nom;
approximate values (Ui nom, Io = 0.5 Io nom)
Uo [% Uo nom]
Rext [k]
105...108 (107 typically)
0
105
3.3
104
6.2
103
10
102
18
101
39
100
∞
The quadruple output units are shown in block diagram 3.
All types with equal output voltage have the Trim function
connected to pin 5 referenced to the primary side which in-
fluences 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.
Synchronisation (W)
This logic input can be used to synchronise the oscillator to
an external frequency source. This pin is edge triggered
with TTL thresholds, and requires a source frequency of
480...540 kHz (duty cycle 10...90%). The external source
frequency is internally divided by 2 to define the switching
frequency for the converter. If unused, this pin can be con-
nected to V1– (pin 2) or left open-circuit.
Reference (Ref)
This option provides a stable 5 V (
±0.2 V) reference signal
on pin Ref. It is protected by a 1.33 k
resistor. This may be
used also in conjunction with the Trim input pin 5 (primary
side) as a limited external voltage reference. We recom-
mend to connect a filter capacitor (0.1
F) between Ref and
Vi–, if Vref is used.
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