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YEV09T10 10A 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
where:
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
V OUT = Desired (trimmed) value of output voltage V
R TRIM = Required value of the trim resistor in k ?
If the R TRIM is not used, the output voltage of the POL
converter will be 0.591V.
Note that the trim resistor tolerance directly affects
the output voltage accuracy. It is recommended to
use ±0.1% trim resistors to meet the output voltage
setpoint accuracy specified in p. 4.2.
Table 1. Trim Resistor Values
tantalum or POS capacitor connected across the
input pins help ensuring stability of the POL
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.
V 0UT, V
0.8
1.2
1.5
1.8
2.5
3.3
5.0
Calculated
R TRIM , k ?
5.65
1.94
1.3
0.98
0.62
0.44
0.27
Standard Value of
0.1% Resistor, k ?
5.62
1.93
1.30
0.976
0.619
0.437
0.267
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 19.
6.3 ON/OFF (Pin 1)
The ON/OFF pin is used to turn the POL converter
ON or OFF remotely by a signal from a system
controller. For positive logic, the POL converter is
ON when the ON/OFF pin is at a logic high (2.4V
min) or left open. The POL converter is OFF when
2
VIN
YEV09T10
VOUT
4
the ON/OFF pin is at a logic low (0.4V max) or
connected to GND.
The ON/OFF pin should be controlled with an open
1
ON /OFF
TRIM
5
collector transistor as shown in Figure 20.
Rload
INPUT
R TRIM
VOLTAGE
2
VIN
YEV09T10
VOUT
4
3
GND
1
ON/OFF
Internal
Enable
TRIM
5
Circuit
CONTROL
Rload
Figure 19. Programming Output Voltage With A Resistor
INPUT
4.32k
R TRIM
3
The trim resistor R TRIM for a desired output voltage
can be calculated using the following equation:
GND
Figure 20. Circuit Configuration For ON/OFF Function
R TRIM ?
1 . 182
V OUT ? 0 . 591
, k ?
ZD-02092 Rev 1.2, 18-Jun-10
www.power-one.com
Page 9 of 12
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