SRL16A-12W Datasheet, PDF (4/4 Pages) MicroPower Direct, LLC – Miniature Surface Mount 16A Output, Switching POL Regulators

Output Voltage Trim
www.micropowerdirect.com
The output voltage level of the SRL16-12W series is adjust- _Sequencing
able over a wide range by the simple addition of an external
resistor. This trim resistor is connected between the circuit
common and the trim input, as shown in the diagram at left.
SRL16A-12W-5.0
SRL16A-12W-5.0
VOUT (VDC)
0.75
1.20
1.50
1.80
RTRIM (k⍀)
Open
22.46
13.05
9.024
VOUT (VDC)
2.00
2.50
3.30
5.00
RTRIM (k⍀)
7.417
5.009
3.122
1.472
The required resistor value for various output levels is
given in the table above. To calculate the correct value
for a different output level, the formula is:
R = TRIM
10, 500
VOUT ^- 0.7525
- _{1, 000}
Where: RTRIM = The external trim resistor
VOUT = The desired output voltage
If a trim resistor is not connected, the output is 0.75 VDC.
Suggested Board Layout
This diagram illustrates a simple
board layout for use with the
SRL16A-12W series. As recom-
mended, external components
are placed as close to the unit
as possible. To help shield
external circuitry, the ground
plane has been extended under
the unit. Any signal traces
should not be routed under-
neath the unit (unless they are
on a layer under the ground
plane) to avoid unwanted noise
interference.
The outputs of multiple SRL16A-12W modules may be con-
troled via the sequencing feature. When not using this feature,
the SEQ input should be left open or tied to VIN. Connecting
modules (as shown above), allows users to control the timing
of the outputs of multiple modules.
For proper sequencing, the input voltage is applied to the
module. The On/Off input of each module is left open so that
the module is on by default. A minimum 10 mS delay (after the
input voltage is applied) is required before applying a voltage
on the SEQ input. As a voltage is applied to the SEQ input, the
module output voltage will track this control voltage (on a one-
to-one volt basis) until the set-point voltage level is reached.
To achieve a simultaneous shutdown of the modules, the SEQ
input voltage is lowered in a controlled manner. The module
output voltages will track this input below their set-point
voltages on a one-to-one basis. The input voltage must be
maintained within specified limits until the tracking and output
voltages reach ground potential.
Suggested Solder Reflow Profile
Mechanical Dimensions
Notes:
• All dimensions are typical in inches (mm)
• Tolerance x.xx = ±0.02 (±0.50)
MicroPower Direct
Pin Connections
Pin Description Pin
1 +V Input
5
2
Sense
6
3 Sequence
7
4 Common
8
Description
+V Output
Trim
Sense
Power Good
We Power Your Success - For Less!
The power Good Signal is optional
292 Page Street Ste D Stoughton, MA 02072 • TEL: [phone] • FAX: [phone] • E-Mail: [e-mail]