YEV09T03 Datasheet, PDF (7/10 Pages) Power-One – 3A DC-DC POL Converter 4.5V to 13.8V Input 0.59V to 5.1V Output

YEV09T03 3A DC-DC POL Converter
4.5V to 13.8V Input  0.59V to 5.1V Output
Data Sheet
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/mVΩ
6. Application Information
6.1 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 4.7μF (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 100μF 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
converter and reduce input ripple voltage.
A 22μF 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.
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/mVΩ
YEV09T03
2
4
VIN
VOUT
1
ON/OFF
5
TRIM
3
GND
R_TRIM
Rload
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
kΩ
ZD-01968 Rev 1.1, 25-Mar-09
www.power-one.com
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