YEV09T10 Datasheet, PDF (9/12 Pages) Power-One – 10A DC-DC POL Converter 4.5V to 13.8V Input 0.59V to 5.1V Output

YEV09T10 10A DC-DC POL Converter
4.5V to 13.8V Input  0.59V to 5.1V Output
Data Sheet
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 19.
YEV09T10
2
4
VIN
VOUT
1
ON /OFF
5
TRIM
3
GND
R_TRIM
Rload
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:
R_TRIM

1.182 _,
V_OUT  0.591
kΩ
where:
V_OUT = Desired (trimmed) value of output voltage V
R_TRIM = Required value of the trim resistor in kΩ
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
V_0UT, V
0.8
1.2
1.5
1.8
2.5
3.3
5.0
Calculated
R_TRIM, kΩ
5.65
1.94
1.3
0.98
0.62
0.44
0.27
Standard Value of
0.1% Resistor, kΩ
5.62
1.93
1.30
0.976
0.619
0.437
0.267
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
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
collector transistor as shown in Figure 20.
INPUT
VOLTAGE
CONTROL
INPUT
2 ^VIN
1 ^ON/OFF
YEV09T10
VOUT ₄
Internal
Enable
Circuit
TRIM ₅
4.32k
3 ^GND
R_TRIM
Rload
Figure 20. Circuit Configuration For ON/OFF Function
ZD-02092 Rev 1.1, 25-Mar-09
www.power-one.com
Page 9 of 12