参数资料
型号: 40IMX35D15D15-8
厂商: Power-One
文件页数: 9/15页
文件大小: 0K
描述: CONVERT DC/DC 4X 15V 35W
标准包装: 5
系列: *
其它名称: 40IMX35D15D15-8 ?

IMX35 Series Data Sheet
?
Auxiliary Functions
35 Watt Quad-Output DC-DC Converters
Table 8: V o versus V ext for V o = 85 to 105% V o nom ;
typical values (V i nom , I o = 0.5 I o nom )
Adjustable Output Voltage
V o [% V o nom ]
V ext [V]
As a standard feature, the IMX35 offer adjustable output
voltages in the range of 85 to 105% of V o nom . Fig. 12 shows the
schematic diagram for the adjustment of quad-output models.
All models with equal output voltages have a Trim input at pin
5 referenced to the primary side, influencing all outputs simul-
taneously. Models with different output voltages exhibit a
Trim1 input, influencing only the first power train ( V o1 and V o4 ).
>105
102
100
95
90
85
Trim [V]
0
1.8
2.5
4.3
6.2
8
Trim1 [V]
0
1.5
2.5
4.25
6.2
8
Adjustment by means of an external resistor R ext :
Synchronization (W)
Vi+
4
06137c
16
Vo1+
It is possible to synchronize the switching frequency of one or
more converters to an external clock signal.
+
V ext
Trim
R ext
Vi–
5
2
Control
circuit
V ref = 2.5 V
15
13
14
Vo1–
Vo2+
Vo2–
This logic input W can be used to synchronize the oscillator to
an external frequency source. This signal is edge-triggered
with TTL thresholds and requires a source frequency of 490 to
540 kHz (duty cycle 10 to 90%). The external source frequency
is internally divided by 2 to define the switching frequency of
the converter. If unused, this pin can be connected to V1– (pin
2) or left open-circuit.
Fig. 13
Output voltage control by means of the Trim input
Adjustment of the output voltage by means of an external
resistor R ext is possible within the range of 100 to 105% of
V o nom . R ext should be connected between Trim (pin 5) and Vi–
(pin 2). The following table indicates suitable resistor values for
typical output voltages under nominal conditions ( V i nom , I o =
0.5 I o nom ).
Note: Connection of R ext to Vi+ may damage the converter.
Adjustment by means of an external voltage source V ext
Reference Output (Ref)
The converter provides a stable 5 V (±0.1 V) reference signal
on pin 7 (Ref). The output is protected by a 1 k ? resistor. The
signal may be used also in conjunction with the Trim input (pin
5) as a limited external voltage reference.
It is recommended to connect a filter capacitor (0 .1 μF)
between Ref and Vi–, if Ref is used.
Shutdown
The outputs of the converters may be enabled or disabled by
means of a logic signal (TTL, CMOS, etc.) applied to shut-
down (pin 8). If the shutdown function is not required, pin 8
Table 7: R ext for V o > V o nom ;
approximate values (V i nom , I o = 0.5 I o nom )
should be left open-circuit:
Converter operating:
2.0 to 20 V
V o [% V o nom ]
105 to 108 (107 typically)
105
102
100
Tr i m
0
10
62
R ext [k ? ]
Trim1
0
17
110
Converter disabled:
–10 to 0 .7 V
For external output voltage adjustment in the range 85 to
105% of V o nom a voltage source V ext (0 to 20 V) is required,
connected to Trim or Trim1 (pin 5) and Vi–. The table below
indicates typical values V o versus V ext . Applying a control
voltage of 15 to 20 V will set the converter into the hiccup
mode. Direct paralleling of the Trim pins of converters of the
same type connected in parallel is feasible.
BCD20009-G Rev AC, 06-May-2013
Page 9 of 15
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