Datasheet

Figure 3a. Trim Connections Using a Trimpot
Figure 2. Using External Capacitors to Reduce
Input/Output Ripple/Noise
20k
5-10
Turns
5
7
6
LOAD
LOAD
8
+INPUT
–INPUT
TRIM
COMMON
–OUTPUT
+OUTPUT
1
2
+INPUT
–INPUT
+OUTPUT
TRIM
1
2
5
7
8
LOAD
LOAD
COMMON
6
–OUTPUT
Figure 3b. Fixed-Value Trim Down Resistor
+INPUT
–INPUT
+OUTPUT
TRIM
1
2
5
7
8
LOAD
LOAD
COMMON
6
–OUTPUT
Figure 3c. Fixed-Value Trim Up Resistor
–OUTPUT
+INPUT
–INPUT
+OUTPUT
1
2
5
7
COMMON
6
C
IN
C
OUT
C
OUT
+
+
+
Input Fusing
Certain applications and/or safety agencies may require the installation of
fuses at the inputs of power conversion components. For MPS A-Series
BWR 15-20 Watt DC/DC Converters, you should use slow-blow type fuses
with values no greater than the following:
V
IN Range Fuse Value
D5A 6A
D12A 4A
D48A 2A
On/Off Control
The On/Off Control pin (pin 4) may be used for remote on/off operation. A
TTL logic high (+2 to +5 Volts, 250µA max.) applied to pin 4 disables the
converter. A TTL logic low (0 to +0.8 Volts, 70µA max.), or no connection,
enables the converter. Control voltages should be referenced to pin 2
(–Input). Applying a voltage to the Control pin when no input power is applied
to the converter can cause permanent damage to the converter.
Output Trimming
The total output voltage span, from +Output (pin 5) to –Output (pin 7) may
be trimmed ±5% via a single external trimpot or fi xed resistor. The trimpot
should be connected as shown in Figure 3a with its wiper connected to pin 8
(Trim). A trimpot can be used to determine the value of a single fi xed resistor
which should be connected as shown in Figures 3b and 3c. Connect the
resistor between pin 8 (Trim) and pin 5 (+Output) to trim "down" the output
voltages. Connect the resistor between pins 8 and 7 (–Output) to trim "up"
the output voltages. Fixed resistors should be metal-fi lm types with absolute
TCR’s less than 100ppm/°C to ensure stability.
BWR Models
15-20W, Dual Output DC/DC Converters
MDC_BWR15_20.D01 Page 4 of 6
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