40IMX1515158G POWER ONE, 40IMX1515158G Datasheet - Page 13

• Manufacturer Part Number: 40IMX1515158G
• Manufacturer: POWER ONE
• Type: Step Downr

Specifications of 40IMX1515158G

• Output Current: 0.5(Typ) A
• Output Voltage: 15 V
• Input Voltage: 20 V
• Number Of Outputs: 2
• Output Power: 15(Typ) W
• Switching Regulator: Yes

Auxiliary Functions
Shutdown 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 this function is not required, the shut-down pin
should be left open-circuit.
Adjustable Output Voltage
As a standard feature, the single- and double-output models
offer adjustable output voltage(s) by using the control input R
or Trim. If the control input is left open-circuit, the output
voltage is set to V
minimum input voltage V
increases proportionally to V
Single-output models with synchronous rectifier (G):
The R input is referenced to the secondary side of the
converter. Adjustment of the output voltage is possible by
means of an external resistor connected between the R pin
and either Vo+ or Vo–.
Fig. 14
Output voltage control for single-output models with
synchronous rectifier.
All other models fitted with R-input:
The R input is referenced to the secondary side of the
converter. Adjustment of the output voltage is possible by
means of either an external resistor or a voltage source.
BCD20008-G Rev AB, 26-Feb-09
Table 8: V
• Converter operating:
• Converter disabled:
• R input for single-output models and -0503-models
• Trim input for double-output models
• R input as option R for most double-output models.
V
Note: For models with synchronous rectifier the logic for V
adjustment differs from other models with R input.
o nom
3.3
5.1
[V]
Vi+
Vi–
V
o
o
[% of V
Typ. values of R
versus V
100
100
90
90
95
95
o nom
o nom
ext
] R
. For output voltages V
approximate values
®
ext1
ext1
0.47
i min
2.7
3.3
8.2
o
06131
/V
[k ]
o nom
(see Electrical Input Data)
Vo–
Vo+
R
.
V
o
Typ. values of R
[% of V
100
105
110
100
105
110
R
R
ext1
ext2
–10 to +0.7 V
2.0 to 20 V
o nom
o
> V
] R
o nom
ext2
ext2
IMX15/IMS15/ IMY15 DC-DC Series Data Sheet
6.8
9.1
3.9
15
Page 13 of 20
[k ]
, the
o
Fig. 15
Output voltage control for single-output models, -0503-
models, and double-output models fitted with option R by
means of the R input.
Double-output models with Trim input:
The Trim input is referenced to the primary side. The figure
below shows the topology. Adjustment is possible trough either
an external resistor or an external voltage source V
Fig. 16
Output voltage control for double-output models (without
option R) by means of the Trim input.
a) Adjustment by means of an external resistor R
b) Adjustment by means of an external voltage V
Note: Applying an external control voltage >2.75 V may damage
the converter.
the resistor shall be connected:
voltage adjustment range of V
range of V
Vo– and R pin.
adjustment in the range of V
the converter to shut down (hiccup mode).
Depending upon the value of the required output voltage,
either: Between the R pin and Vo– to achieve an output
or: Between the R pin and Vo+ to achieve an output voltage
The control voltage range is 1.96 to 2.62 V and allows for
Attempting to adjust the output below this range will cause
+
–
Vi+
Vi–
V
R
ext
V
R
ref
ext1
V
ext2
ext
o
= 2.5 V
4 k
100 to 105 % of V
4 k • ––––––––––––––––––
R
––––––––
V
Trim
ext
15 -Watt DC-DC Converters
o
Vi+
Vi–
V
• 2.5 V
o nom
• –––––––––
Control
4 k
logic
V
2.5 V • (V
o nom
V
(V
o
o
– V
o
06029b
– 2.5V)
o
o nom
o
80 to 105% of V
o
/V
80 to 100 % of V
o nom
.
V
Vo+
R
Vo-
Control
ref
circuit
www.power-one.com
2.5 V
– 1)
R
R
06089a
ext 2
ext1
ext
o nom
ext
ext
+
.
o nom
-
.
Vo1+
Vo1–
Vo2+
Vo2–
between
.
.
V
ext