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YEV09T20 20A 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:
V OUT = Desired (trimmed) value of output voltage V
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 30 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 47-100 μ F decoupling capacitor placed as close as
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
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.
The converter has been designed for stable
operation with or without external capacitance. 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
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
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 2) and SENSE- pin (Pin 8),
as shown in Figure 19.
6.3 ON/OFF (Pin 5)
The ON/OFF pin is used to turn the power converter
on or off remotely via a system signal. Internal
impedance of ON/OFF pin to ground is typically
4.32k ? . The ON/OFF signal is referenced to
ground. The converter is ON when the ON/OFF pin
is at a logic high (1V min) or left OPEN and OFF
when the ON/OFF pin is at a logic low (0.4V max) or
connected to GND. This model has internal pull-up
6
VIN
YEV09T20
SENSE+
7
1
resistor 30.1k ? from ON/OFF pin to Vin.
The typical connections are shown in Figure 20.
VOUT
5
ON/OFF
TRIM
2
Vin
4
3
PGOOD
GND
SENSE-
8
R TRIM
Rload
INPUT
VOLTAGE
6
5
VIN
ON/OFF
YEV09T20
Internal
Enable
Circuit
CONTROL
Figure 19. Programming Output Voltage With A Resistor
The trim resistor R TRIM for a desired output voltage
can be calculated using the following equation:
INPUT
3
GND
4.32 k ?
R TRIM
?
1 . 182
V OUT ? 0 . 591
, k ?
Figure 20. Circuit Configuration For ON/OFF Function
ZD-02093 Rev. 1.2, 18-Jun-10
www.power-one.com
Page 9 of 12
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