YNM12S05-G POWER ONE, YNM12S05-G Datasheet - Page 5

• Manufacturer Part Number: YNM12S05-G
• Description: Module DC-DC 1-OUT 0.7525V to 5.5V 5A 28W 5-Pin SMD T/R
• Manufacturer: POWER ONE

Operations
Input and Output Impedance
Y-Series converter should be connected via a low
impedance to the DC power source. In many
applications, the inductance associated with the
distribution from the power source to the input of the
converter can affect the stability of the converter. It is
recommended
(minimum 47 μF) placed as close as possible to the
converter’s input pins in order to ensure stability of
the converter and reduce input ripple voltage.
Internally, the converter has 3.2 μF (low ESR
ceramics) of input capacitance.
In a typical application, low - ESR tantalum or POS
capacitors will be sufficient to provide adequate
ripple voltage filtering at the input of the converter.
However,
47-100 μF are recommended at the input of the
converter in order to minimize the input ripple
voltage. They should be placed as close as possible
to the input pins of the converter.
The YNM12S05 has been designed for stable
operation with or without external capacitance. Low
ESR ceramic capacitors placed as close as possible
to the load (minimum 47 μF) are recommended for
better transient performance and lower output
voltage ripple.
It is important to keep low resistance and low
inductance PCB traces for connecting your load to
the output pins of the converter. This is required to
maintain good load regulation since the converter
does not have a SENSE pin for compensating
voltage drops associated with the power distribution
system on your PCB.
ON/OFF (Pin 1)
The ON/OFF pin (Pin 1) is used to turn the power
converter on or off remotely via a system signal that
is
connections are shown in Fig. A.
To turn the converter on the ON/OFF pin should be
at a logic low or left open, and to turn the converter
off the ON/OFF pin should be at logic high or
connected to Vin.
The ON/OFF pin is internally pulled down. A TTL or
CMOS
transistor can be used to drive the ON/OFF pin.
When using open-collector (open-drain) transistor,
add a pull-up resistor (R*) of 75 kΩ to Vin as shown
in Fig. A.
MCD10192 Rev. 1.0, 21-Jun-10
referenced
logic
very
gate,
to
to
low
GND
use
open-collector
ESR
decoupling
(Pin
ceramic
9.6-14 VDC Input; 0.7525-5.5 VDC Programmable @ 5 A
4).
The
(open-drain)
capacitors
capacitors
typical
Page 5 of 24
YNM12S05 DC-DC Converter Data Sheet
This device must be capable of:
- sinking up to 0.2 mA at a low level voltage of
 0.8 V
- sourcing up to 0.25 mA at a high logic level of
2.3 to 5 V
- sourcing up to 0.75 mA when connected to Vin.
Output Voltage Programming (Pin 3)
The output voltage can be programmed from
0.7525 to 5.5 V by connecting an external resistor
between TRIM pin (Pin 3) and GND pin (Pin 4); see
Fig. B. Note that when trim resistor is not connected,
output voltage of the converter is 0.7525 V.
A trim resistor, R
can be calculated using the following equation:
where,
Note that the tolerance of a trim resistor directly
affects
recommended to use standard 1% or 0.5% resistors;
for tighter tolerance, two resistors in parallel are
recommended rather than one standard value from
Table 1.
Vin
Vin
R
R
Vin
V
CONTROL
T
TRIM
O
INPUT
RIM
REQ
Fig. B: Configuration for programming output voltage.
Fig. A: Circuit configuration for ON/OFF function.



Required value of trim resistor [kΩ]
(V
R*
Desired (trimmed) output voltage [V]
the
www.power-one.com
O
-
REQ
10
ON/OFF
GND
GND
Vin
ON/OFF
Vin
-
output
5 .
0.7525)
TRIM
, for a desired output voltage
(Top View)
Converter
(Top View)
Converter
Y-Series
Y-Series

voltage
1
Vout
TRIM
tolerance.
TRIM
Vout
[kΩ]
R
TRIM
It
Rload
Rload
is