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參數(shù)資料
| 型號： | 70IMX35D05D12-8-I |
| 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)： | 16/16頁 |
| 文件大小： | 408K |
| 代理商： | 70IMX35D05D12-8-I |
BCD20009-G Rev AA
Page 9 of 16
www.power-one.com
IMX35 Series Data Sheet
35-Watt Quad-Output DC-DC Converters
Table 7: Rext1 for Vo > Vo nom;
approximate values (Vi nom, Io = 0.5 Io nom)
Vo [% Vo nom]
Rext [k
]
Trim [k
]
Trim1 [k
]
105 to 108 (107 typically)
0
105
10
17
102
62
110
100
∞∞
Auxiliary Functions
Adjustable Output Voltage
As a standard feature, the IMX35 offer adjustable output
voltages in the range of 85 to 105% of Vo nom. Fig. 12 shows the
schematic diagram for the adjustment of quad-output models.
All models with equal output voltages have the trim function
connected to pin 5 referenced to the primary side, influencing
all outputs simultaneously. However, the Trim1 input of models
with different output voltage on the power trains influences only
the first power train.
Fig. 12
Output voltage control by means of the Trim input
Table 8: Vo versus Vext for Vo = 85 to 105% Vo nom;
typical values (Vi nom, Io = 0.5 Io nom)
Vo [% Vo nom]
Vext [V]
Trim [V]
Trim 1 [V]
>105
0
102
1.8
1.5
100
2.5
95
4.3
4.25
90
6.2
85
8
Synchronization (W)
It is possible to synchronize the switching frequency of one or
more converters to an external symmetrical clock signal. If this
option is required, consult factory for full application details.
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 for
the converter. If unused, this pin can be connected to V1– (pin
2) or left open-circuit.
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 F)
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 shut down function is not required, then pin
8 should be left open-circuit:
Converter operating:
2.0 to 20 V
Converter disabled:
–10 to 0 .7 V
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 to 105% of
Vo nom. Rext 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 (Vi nom, Io
= 0.5 Io nom).
Note: Connection of Rext to Vi+ may damage the converter.
Adjustment by means of an external voltage source Vext
For external output voltage adjustment in the range 85 to
105% of Vo nom a voltage source Vext (0 to 20 V) is required,
connected to Trim or Trim1 (pin 5) and Vi–. The table below
indicates typical values Vo versus Vext. 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.
Trim
Vo1+
Vo2–
+
V
ext
–
Vi+
Vi–
R
ext
Vo1–
Vo2+
06137b
Control
circuit
Vref = 2.5 V
4
5
2
16
15
13
11
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