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YNM12S05 DC-DC Converter Data Sheet
9.6-14 VDC Input; 0.7525-5.5 VDC Programmable @ 5 A
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
Vin
R*
Vin
ON/OFF
GND
Y-Series
Converter
(Top View)
Vout
TRIM
Rload
R T RIM ?
? 1
[k ? ]
converter can affect the stability of the converter. It is
recommended to use decoupling capacitors
(minimum 47 μ F) 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 μ F (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, very low ESR ceramic capacitors
47-100 μ F 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 μ F) 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.
CONTROL
INPUT
Fig. A: Circuit configuration for ON/OFF function.
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 TRIM , for a desired output voltage
can be calculated using the following equation:
10 . 5
(V O - REQ - 0.7525)
where,
R TRIM ? Required value of trim resistor [k ? ]
V O ? REQ ? Desired (trimmed) output voltage [V]
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 referenced to GND (Pin 4). The typical
Vin
Vin
ON/OFF
Y-Series
Converter
(Top View)
Vout
connections are shown in Fig. A.
To turn the converter on the ON/OFF pin should be
GND
TRIM
R TRIM
Rload
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 logic gate, open-collector (open-drain)
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 k ? to Vin as shown
in Fig. A.
Fig. B: Configuration for programming output voltage.
Note that the tolerance of a trim resistor directly
affects the output voltage tolerance. It is
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.
MCD10192 Rev. 1.0, 21-Jun-10
Page 5 of 24
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