LSM-0.8-10-D12 C&D Technologies., LSM-0.8-10-D12 Datasheet - Page 7

• Manufacturer Part Number: LSM-0.8-10-D12
• Description: Non-isolated, 12vin, 0.75-5vo U T Dc/dc Converters
• Manufacturer: C&D Technologies.

output voltage drops to less than 98% of it original value, the LSM D12's inter-
nal overcurrent-detection circuitry immediately turns off the converter, which
then goes into a "hiccup" mode. While hiccupping, the converter will continu-
ously attempt to restart itself, go into overcurrent, and then shut down. Once
the output short is removed, the converter will automatically restart itself.
Output Voltage Trimming (Except "T" models—See "T" Trimming)
Allowable trim ranges for each model in the LSM D12 SMT Series are ±10%.
The LSM-T/10-D12 has a user-selectable output range of +0.75V to +5V.
Trimming is accomplished with either a trimpot or a single fixed resistor. The
trimpot should be connected between +Output and Common with its wiper
connected to the Trim pin as shown in Figure 6 below.
which can then be connected, as shown in Figure 7, between the Trim pin and
+Output to trim down the output voltage, or between the Trim pin and Common
to trim up the output voltage. Fixed resistors should have absolute TCR’s less
than 100ppm/°C to ensure stability.
If the output current exceeds it maximum rating by typically 70% or if the
A trimpot can be used to determine the value of a single fixed resistor
+INPUT
COMMON
Figure 7. Trim Connections Using Fixed Resistors
Figure 6. Trim Connections Using a Trimpot
+OUTPUT
COMMON
TRIM
Trim
Down
T rim
Note: Install either a fixed
trim-up resistor or a fixed
trim-down resistor depending
upon desired output voltage.
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trim-resistor values. Recall, untrimmed devices are guaranteed to be ±1.25%
accurate.
When using trim in combination with Remote Sense, the maximum rated power
must not be exceeded (see Remote Sense).
"T" Model, LSM-T/10-D12, Trimming
This version of the LSM 10A series offers a special output voltage trimming
feature which is fully compatible with competitive units. The output voltage
may be varied from 0.75 to 5 Volts using a single external trim up resistor con-
nected from the Trim input to Output Common. If no trim resistor is attached
(Trim pin open), the output is 0.7525 Volts.
nected to the Trim input.
low temperature coefficient (±100 ppm/°C or less) mounted close to the con-
verter with short leads. Also be aware that the output accuracy is ±2% (typical)
therefore you may need to vary this resistance slightly to achieve your desired
output setting.
R
R
R
T
T
T
The following trim equations can be starting points for selecting specific
Adjustment beyond the specified adjustment range is not recommended.
The trim may also be adjusted using an external reference voltage con-
As with other trim adjustments, use a 1% metal film precision resistor with
DOWN
DOWN
DOWN
tolerances of resistors and factory-adjusted, initial output accuracy.
Note: Resistor values are in kΩ. Accuracy of adjustment is subject to
Non-Isolated, 12V
(kΩ) =
(kΩ) =
(kΩ) =
V
O
= desired output voltage. V
1.82(V
4.64(V
V
V
7.5(V
V
O NOM
O NOM
Technical enquiries email: [e-mail], tel:
O NOM
Note: LSM-0.8/10-D12 is not trimmable.
LSM-2.5/10-D12: X = 20
LSM-3.3/10-D12: X = 15
LSM-5/10-D12:
LSM-1/10-D12:
LSM-1.1/10-D12: X = 2.49
LSM-1.2/10-D12: X = 3.09
LSM-1.3/10-D12: X = 4.12
LSM-1.5/10-D12: X = 13.3
LSM-1.8/10-D12: X = 16.9
LSM-2/10-D12:
O
O
O
– 0.8)
– 0.8)
– 0.8)
– V
– V
– V
O
O
O
in
LSM-10A D12 Models
– X
– X
– X
Trim Equations
, 0.75-5V
MDC_LSM 10A D12 Models.B01 Page 7 of 18
o nom
X = 0.909
X = 15.4
X = 10
R
R
R
Single Output
T
T
T
= nominal output voltage.
UP
UP
UP
(kΩ) =
(kΩ) =
(kΩ) =
out
DC/DC Converters
V
V
V
O
O
O
– V
– V
– V
1.46
3.72
6
[phone]
O NOM
O NOM
O NOM
– X
– X
– X