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YEV09T03 3A DC-DC POL Converter
4.5V to 13.8V Input ? 0.59V to 5.1V Output
Data Sheet
6.
6.1
Application Information
Input and Output Impedance
The POL converter should be connected to the DC
power source via low impedance. 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.
Internally, the converter includes 4.7 μ F (low ESR
ceramics) of input capacitance which eliminates the
need for external input capacitance. However, if the
distribution of the input voltage to the POL converter
contains high inductance, it is recommended to add
a 100 μ F decoupling capacitor placed as close as
possible to the converter input pins. A low-ESR
tantalum or POS capacitor connected across the
input pins help ensuring stability of the POL
Figure 10.
Transient Response to Dynamic Load Change
from 40% to 80% of full load (Vin=12V,
Vo=2.5Vdc). Ch3 – Iout. Scale=0.2A/mV ?
converter and reduce input ripple voltage.
A 22 μ F ceramic output capacitor is recommended to
improve output ripple and dynamic response.
It is important to keep low resistance and low
inductance of PCB traces for connecting load to the
output pins of the converter in order to maintain good
load regulation.
6.2
Output Voltage Programming
The output voltage can be programmed from 0.59V
to 5.1V by connecting an external resistor R TRIM
between TRIM pin (Pin 5) and GND pin (Pin 3), as
shown in Figure 12.
2
YEV09T03
4
1
VIN
ON/OFF
VOUT
TRIM
5
R TRIM
Rload
Figure 11.
Transient Response to Dynamic Load Change
from 40% to 80% of full load (Vin=12V,
Vo=3.3Vdc). Ch3 – Iout. Scale=0.2A/mV ?
3
GND
Figure 12. Programming Output Voltage With A Resistor
The trim resistor R TRIM for a desired output voltage
can be calculated using the following equation:
R TRIM ?
1 . 182
V OUT ? 0 . 591
, k ?
ZD-01968 Rev 1.2, 18-Jun-10
www.power-one.com
Page 7 of 10
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