bcp-5-3.3 C&D Technologies., bcp-5-3.3 Datasheet - Page 7

• Manufacturer Part Number: bcp-5-3.3
• Description: Dual Output, Mixed Voltage, Isolated 5v & 3.3 V, Half-brick 75 W Dc/dc Converters
• Manufacturer: C&D Technologies.

Output Trimming
Both the 5V and 3.3V outputs of the BCP Series can be independently trimmed
via a trimpot (Figure 3A) or a single fixed resistor as shown (Figures 3B & 3C).
The trimpot can be used to determine the value of a single fixed resistor. A
single fixed resistor can increase or decrease the output voltage depending on
its connection. Fixed resistors should be metal-film types with absolute TCR’s
less than 100ppm/°C to ensure stability.
to the appropriate Return (pin 6 for 5V trim, pin 9 for 3.3V trim) will increase
the output voltage.
3.3V trim) to its appropriate +Output (pin 7 for 5V trim, pin 10 for 3.3V trim) will
decrease the output voltage.
Figure 3C. Decrease Output Voltage Trim Connections Using a Fixed Resistor
A resistor connected from the Trim Pin (pin 5 for 5V trim, pin 8 for 3.3V trim)
A single resistor connected from the Trim Pin (pin 5 for 5V trim, pin 8 for
Figure 3B. Increase Output Voltage Trim Connections Using a Fixed Resistor
1
4
1
4
1
4
–INPUT
+INPUT
–INPUT
+INPUT
–INPUT
+INPUT
Figure 3A. Trim Connections Using a Trimpot
+3.3V OUTPUT
+3.3V OUTPUT
+3.3V OUTPUT
3.3V RETURN
3.3V RETURN
3.3V RETURN
+5V OUTPUT
+5V OUTPUT
+5V OUTPUT
5V RETURN
5V RETURN
5V RETURN
3.3V TRIM
3.3V TRIM
3.3V TRIM
5V TRIM
5V TRIM
5V TRIM
10
8
9
7
5
6
10
10
8
9
7
5
6
8
9
7
5
6
TURNS
TURNS
+3.3V
DOWN
DOWN
20kΩ
20kΩ
TRIM
TRIM
+3.3V
TRIM
TRIM
5-22
5-22
+5V
+5V
www.murata-ps.com
UP
UP
+3.3V
LOAD
LOAD
+3.3V
LOAD
LOAD
+3.3V
LOAD
LOAD
+5V
+5V
+5V
changes of 0 through 10%. Trim adjustment greater than 10% can have an
adverse affect on the converter’s performance and is not recommended.
Case Connection
BCP DC/DC's do not have their metal baseplate connected to one of the input
pins. The "uncommitted" baseplate is connected to pin 2 which, depending
upon your system configuration, should be connected to either +Input (pin 4),
–Input (pin 1), Output Returns (pins 6 & 9), or earth ground.
V
V
Table 1. Percentage of Output Voltage Change vs Trim Resistor Value (Ohms)
O
O
Table 1 shows the typical fixed Trim Resistor values for output voltage
The following equations mathematically depict:
V
= 1.25
= 1.23
R
R
O
T
T
= 5.0 +
10%
UP
UP
0%
1%
2%
3%
4%
5%
6%
7%
8%
9%
tolerances of resistor values and factory-adjusted output accuracy.
Note: Resistor values are in kΩ. Accuracy of adjustment is subject to
V
(k ) =
(k ) =
O
= 3.30 +
3.3 Volt Trim Up
Output Voltage for a given Trim Resistor
Trim Resistor for a given Output Voltage
Dual Output, Mixed Voltage, Isolated 5V & 3.3 V,
0.38 +
1.23 +
5 Volt Trim Up
For Model BCP-5/15-3.3/15-D48-T only (special order only)
0.30R
(5.76 – V
(5.825 – V
Trim Down
47.81k
22.32k
13.82k
5.320k
R
9.57k
7.02k
4.10k
3.19k
2.48k
1.92k
T
3.3V
R
T
UP
R
T
Technical enquiries email: [e-mail], tel:
DOWN
V
V
–
T
(kW) + 1.5
DOWN
1
1.14
O
O
UP
2.07
(kW) + 4.99
(kW) + 2.37
O
– 5
– 3.3
(kW)+ 2.37
) x 3.3
O
) x 0.33
1
1
1
V
"Half-Brick" 75 W DC/DC Converters
O
= desired output voltage.
3.3 Volt Trim Down
5 Volt Trim Down
3.3 Volt Trim Up
Trim Up
5 Volt Trim Up
27.93k
12.78k
+1
7.73k
5.21k
3.69k
2.68k
1.96k
1.42k
1.00k
0.66k
+1
3.3V
–
R
R
T
R
R
T
DOWN
R
UP
T
T
T
(kW) =
DOWN
DOWN
DOWN
(kW) =
R
T
(kW) =
UP
(kW) =
(k ) =
(k ) =
MDC_BCP_75W.B02 Page 7 of 14
Trim Down
BCP Models
189.75k
91.06k
58.17k
41.72k
31.85k
25.27k
20.57k
17.05k
14.31k
12.12k
5 Volt Trim Down
3.3 Volt Trim Down
(0.3V
5V
–
(0.8V
(V
(V
V
O
1.23
O
O
O
) – 1.50
1.14
V
– 4.42) x 4.3
– 2.89) x 0.66
O
– 3.3
2.07
1
O
) – 1
1
5 – V
3.3 – V
1
–1
1
O
[phone]
O
–2.37
–1.23
–0.38
Trim Up
–4.99
61.68k
28.34k
17.23k
11.68k
8.34k
6.12k
4.53k
3.34k
2.42k
1.68k
5V
–
–2.37
–4.99