GE Industrial Solutions 12V TLynx 20A - Manual (Page 14)

GE
Data Sheet
12V TLynx TM 20A: Non-Isolated DC-DC Power Modules
4.5Vdc –14Vdc input; 0.69Vdc to 5.5Vdc output; 20A Output Current
May 2, 2013 ©2013 General Electric Company. All rights reserved. Page 14
operation of the module, limit the capacitance to less than the
maximum output capacitance as specified in the electrical
specification table. Optimal performance of the module can be
achieved by using the Tunable Loop
TM feature described later in
this data sheet.
0
10
20
30
40
0.5 1.5 2.5 3.5 4.5 5.5
Output Voltage (Volts)
R
ip
p
le
(m
V
p
-p
)
1x10uF External Cap
1x47uF External Cap
2x47uF External Cap
4x47uF External Cap
Figure 41. Output ripple voltage for various output voltages
with external 1x10 µF, 1x47 µF, 2x47 µF or 4x47 µF ceramic
capacitors at the output (20A load). Input voltage is 12V.
Safety Considerations
For safety agency approval the power module must be installed
in compliance with the spacing and separation requirements of
the end-use safety agency standards, i.e., UL 60950-1, CSA
C22.2 No. 60950-1-03, and VDE 0850:2001-12 (EN60950-1)
Licensed.
For the converter output to be considered meeting the
requirements of safety extra-low voltage (SELV), the input must
meet SELV requirements. The power module has extra-low
voltage (ELV) outputs when all inputs are ELV.
The input to these units is to be provided with a fast-acting fuse
with a maximum rating of 20 A in the positive input lead
.
Feature Descriptions
Remote Enable
The 12V TLynx TM modules feature an On/Off pin for
remote On/Off operation. Two On/Off logic options are
available. In the Positive Logic On/Off option, (device
code suffix “4” – see Ordering Information), the module
turns ON during a logic High on the On/Off pin and turns
OFF during a logic Low. With the Negative Logic On/Off
option, (no device code suffix, see Ordering Information),
the module turns OFF during logic High and ON during
logic Low. The On/Off signal is always referenced to
ground. For either On/Off logic option, leaving the On/Off
pin disconnected will turn the module ON when input
voltage is present.
For positive logic modules, the circuit configuration for
using the On/Off pin is shown in Figure 42. When the
external transistor Q1 is in the OFF state, the internal
PWM Enable signal is pulled high through an internal
24.9k
Ω resistor and the external pullup resistor and the
module is ON. When transistor Q1 is turned ON, the
On/Off pin is pulled low and the module is OFF. A
suggested value for R
pullup
is 20k Ω.
23K
I
ON/OFF
24.9K
Q1
GND
ON/OFF
VIN+
_
+
PWM Enable
V
ON/OFF
MODULE
Rpullup
22K
Q3
22K
12.1K
Q2
22K
Figure 42. Circuit configuration for using positive
On/Off logic.
For negative logic On/Off modules, the circuit
configuration is shown in Fig. 43. The On/Off pin should
be pulled high with an external pull-up resistor
(suggested value for the 4.5V to 14V input range is
20Kohms). When transistor Q1 is in the OFF state, the
On/Off pin is pulled high, internal transistor Q2 is turned
ON and the module is OFF. To turn the module ON, Q1 is
turned ON pulling the On/Off pin low, turning transistor
Q2 OFF resulting in the PWM Enable pin going high and
the module turning ON.