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參數(shù)資料
| 型號： | 110IMY70-15-15-0G |
| 廠商： | POWER-ONE INC |
| 元件分類： | 電源模塊 |
| 英文描述： | 2-OUTPUT 70 W DC-DC REG PWR SUPPLY MODULE |
| 封裝： | ROHS COMPLIANT PACKAGE-19 |
| 文件頁數(shù)： | 2/15頁 |
| 文件大小： | 244K |
| 代理商： | 110IMY70-15-15-0G |
BCD.00002 Rev AB, 2-Mar-2011
Page 10 of 15
www.power-one.com
IMX70, IMY70 Series Data Sheet
70 Watt DC-DC Converters
Auxiliary Functions
Adjustable Output Voltage
As a standard feature, the converters offer adjustable output
voltages by using the control input R. Fig. 10 shows the
schematic diagram of the circuitry. If the control input is left
open-circuit, the output voltage is set to Vo nom.
Note: For output voltages Vo > Vo nom, the minimum input voltage
Vi min (see Electr. Input Data) increases proportionally to Vo /Vo nom.
Fig. 10
Output voltage control by means of the R input
The R input is referenced to the secondary side of the
converter. Adjustment of the output voltage Vo (or Vo1) is
possible by means of either an external resistor or a voltage
source.
a) Adjustment by means of an external resistor Rext.
Depending upon the value of the required output voltage,
the resistor shall be connected:
either: Between the R pin and Vo– (or Vo1) to achieve an
output voltage adjustment range of Vo
≈ 80 to 100 % of
Vo nom.
Vo
Rext1
≈ 4 kΩ –––––––––
Vo nom – Vo
or: Between the R pin and Vo+ (or Vo1+) to achieve an
output voltage range of Vo
≈ 100 to 105% of Vo nom.
(Vo – 2.5V)
Rext2
≈ 4 kΩ ––––––––––––––––––
2.5 V (Vo/Vo nom – 1)
b) Adjustment by means of an external voltage Vext between
Vo– (or Vo1–) and the R pin.
The control voltage range is 1.96 to 2.62 V and allows for
adjustment in the range of Vo
≈ 80 to 105% of Vo nom.
Vo 2.5 V
Vext
≈ ––––––––
Vo nom
Note: Applying an external control voltage >2.75 V may damage
the converter.
Reference Output (Ref)
The converter provides a stable 5 V (± 0.25 V) reference signal
on pin 7 (Ref). The output is protected by a 1 k
Ω resistor.
Note: It is recommended to connect a filter capacitor (0.1 F)
between Ref and Vi–, if Ref is used.
Synchronization (W)
It is possible to synchronize the switching frequency of one or
more converters to an external clock signal. If this option is
required, consult Power-One for full application details.
Note: In case of no synchronization, pin 6 (W) can be connected to
Vi– (pin 2) or left open-circuit.
Shutdown (S
_
D
_
)
The outputs of the converters may be enabled or disabled by a
logic signal (TTL, CMOS, etc.) applied between the shutdown
pin 8 and Vi–. If the shutdown function is not required, pin 8
should be left open-circuit. Voltage on pin 8:
Converter operating:
2.0 to 20 V
Converter disabled:
– 0 .7 to +0.7 V
Progr. Input Voltage Lockout PUL
A special feature of these converters is the adjustable accurate
undervoltage lockout function, protecting the converter (and
the system) from high currents caused by operation at too low
input voltage. This ensures easier startup in distributed power
systems.
The undervoltage lockout levels may be programmed by use of
an external resistor RPUL (between PUL and Vi–) to increase
the preset levels, as indicated in the table below (with
hysteresis).
The overvoltage lockout (OVL) cannot cannot be varied.
Table 8: Turn-on and shutdown voltage (pin 1 left open)
Model
Turnonlevel
Hysteresis
OVL
Unit
24IMX70
12 to 13
V
40IMX70
19 to 20.5
110IMY70
44.5 to 47.5
typ. 6
160 to 175
Table 9: Typical values for RPUL and the respective turn-on
input voltage Vi LO.
24IMX70
40 IMX70
R PUL [k
Ω
Ω]
Vi LO [V]
R PUL [k
Ω
Ω]
Vi LO [V]
∞
≤ 12
∞
≤ 20
39
43
19
16
13
10
9.1
0
110 IMY70
R PUL [k
Ω
Ω]
Vi LO [V]
∞
46
270
50
110
57
82
61
R
Vo+
Vo–
+
Vext
–
4 kΩ
Vref = 2.5 V
Control
logic
Rext1
Rext2
06029e
Vi–
Vi+
+
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