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YNV12T05 DC-DC Converter Data Sheet
9.6-14 VDC Input; 0.7525-5.5 VDC Programmable @ 5 A
Operations
Input and Output Impedance
The 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 to use decoupling capacitors 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
20 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 to 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 YNV12T05 has been designed for stable
operation with or without external capacitance. Low
off the ON/OFF pin should be at a 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 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. 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 2)
The output voltage can be programmed from 0.7525
to 5.5 V by connecting an external resistor between
the TRIM pin (Pin 2) and the GND pin (Pin 3); see
Fig. B.
A trim resistor, R TRIM , for a desired output voltage
can be calculated using the following equation:
ESR ceramic capacitors placed as close as possible
to the load (minimum 47 μ F) are recommended for
better transient performance and lower output
R T RIM ?
10 . 5
(V O - REQ - 0.7525)
? 1
[k ? ]
voltage ripple.
It is important to keep low resistance and low
inductance PCB traces for connecting load to the
output pins of the converter in order to maintain good
where,
R TRIM ? Required value of trim resistor [k ? ]
V O ? REQ ? Desired (trimmed) output voltage [V]
load regulation.
ON/OFF (Pin 5)
The ON/OFF pin (Pin 5) is used to turn the converter
Vin
Vin
ON/OFF
Y-Series
Converter
(Top View)
Vout
on or off remotely via a system signal that is
referenced to GND (Pin 3). Typical connections are
shown in Fig. A.
GND
TRIM
R TRIM
Rload
R*
Vin
ON/OFF
Y-Series
Converter
(Top View)
Vout
Fig. B: Configuration for programming output voltage.
Note that the tolerance of a trim resistor directly
affects the output voltage tolerance. It is
Vin
recommended to use standard 1% or 0.5% resistors;
CONTROL
GND
TRIM
Rload
for tighter tolerance, two resistors in parallel are
recommended rather than one standard value from
Table 1.
INPUT
Fig. A: Circuit configuration for ON/OFF function.
To turn the converter on the ON/OFF pin should be
at a logic low or left open, and to turn the converter
The ground pin of the trim resistor should be
connected directly to the converter’s GND pin (Pin 3)
with no voltage drop in between. Table 1 provides
the trim resistor values for popular output voltages.
MCD10201 Rev. 1.0, 24-Jun-10
Page 5 of 26
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