参数资料
| 型号： | 20IMX15-24-24-8 |
| 厂商： | Power-One |
| 文件页数： | 10/15页 |
| 文件大小： | 0K |
| 描述： | CONVERT DC/DC 15W 2X 24V |
| 标准包装： | 6 |
| 系列： | * |
IMX70, IMY70 Series Data Sheet
70 to 90 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 V o nom .
Note : For output voltages V o > V o nom , the minimum input voltage
V i min (see Electr. Input Data ) increases proportionally to V o / V o nom .
06029e
Note: This feature allows connecting the outputs together through
ORing diodes to achieve redundancy. We recommend Schottky
diodes mounted onto the same heat sink (for thermal balancing).
Sense Lines
The sense inputs of single-output models allow for compen-
sating a voltage drop up to 1 V (0.6 V for models with V o nom = 5.1 V).
Synchronization (W)
Double-output models can be synchronized to an external
Vi+
Vo+
TTL signal (220 ±10 kHz, duty cycle 10 – 15%). Due to the
V ref = 2.5 V
+
4 k ?
Control
logic
R
R ext2
R ext1
+
V ext
higher switching frequency, the efficiency will slightly drop.
Note : If this feature is not used, W (pin 6) can be connected to Vi–
(pin 2) or left open-circuit.
_ _
Vi–
Vo–
–
Shutdown (S D )
Fig. 11
Output voltage control by means of the R input
The R-input is referenced to the secondary side of the
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. Adjustment of V o (or V o1 ) is possible by means of
either an external resistor or a voltage source.
Converter operating:
Converter disabled:
2.0 to 20 V
– 0.7 to +0.7 V
R ext1 ≈ 4 k ? ? –––––––––
R ext2 ≈ 4 k ? ? ––––––––––––––––––
a) Adjustment by means of an external resistor R ext .
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 V o ≈ 80 to 100 % of
V o nom . Single-output models can be trimmed to V o ≈ 0 V.
V o
V o nom – V o
or: Between the R-pin and Vo+ (or Vo1+) to achieve an
output voltage range of V o ≈ 100 to 105% of V o nom .
( V o – 2.5 V)
2.5 V ? ( V o / V o nom – 1)
Progr. Input Voltage Lockout PUL
A special feature of these converters is the adjustable under-
voltage lockout function, protecting the converter (and system)
from high currents caused by operation at too low input volt-
age. This ensures easier start-up in distributed power systems.
The undervoltage lockout level can be programmed by an
external resistor R PUL (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)
b) Adjustment by means of an external voltage V ext 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 V o ≈ 80 to 105% of V o nom .
Single-output models can be trimmed to V o ≈ 0 V.
Model
24IMX70
40IMX70
110IMY70
Turn-on level
13.5 – 14.5
22 – 23.5
44.5 – 47.5
Hysteresis
typ. 2.5
typ. 6
OVL
41 – 43
160 – 175
Unit
V
V ext ≈ ––––––––
V o ?2.5 V
V o nom
Table 9: Typical values for R PUL and the respective turn-on
input voltage V i LO .
Note: Single-output models can be trimmed up to 110% of V o nom .
24IMX70
40 IMX70
Note: Applying a higher external control voltage as needed for the
max. trim range 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 ? resistor.
V i LO [V]
14
16
18
20
R PUL [k ? ]
∞
120
62
41
V i LO [V]
24
R PUL [k ? ]
∞
Note : It is recommended to connect a filter capacitor (0.1 μF)
between Ref and Vi–, if Ref is used.
110 IMY70
single-output double-output
Current Sharing (T)
This feature is available for single-output models. Several
parallel connected converters will share their current evenly
by interconnecting the T pins (pin 11).
V i LO [V]
46
50
57
61
R PUL [k ? ]
∞
68
25.5
18
R PUL [k ? ]
∞
270
110
82
BCD.00002 Rev AF, 18-Dec-2013
MELCHER
The Power Partners.
Page 10 of 15
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| 20IMX15-24-24-8G | 制造商:Power-One 功能描述: 制造商:Power-One 功能描述:DC/DC CONVERT DUAL 24V 0.32A |
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| 20IMX35 | 制造商:POWER-ONE 制造商全称:Power-One 功能描述:IMX35 Series Data Sheet 35 Watt Quad-Output DC-DC Converters |
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