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参数资料
| 型号： | YEV09T20-0 |
| 厂商： | POWER-ONE INC |
| 元件分类： | 电源模块 |
| 英文描述： | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| 封装： | SIP-10 |
| 文件页数： | 12/12页 |
| 文件大小： | 291K |
| 代理商： | YEV09T20-0 |
YEV09T20 20A DC-DC POL Converter
4.5V to 13.8V Input 0.59V to 5.1V Output
Data Sheet
ZD-02093 Rev. 1.2, 18-Jun-10
www.power-one.com
Page 9 of 12
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 30μF (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 47-100μF 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.
The converter has been designed for stable
operation with or without external capacitance. 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 RTRIM
between TRIM pin (Pin 2) and SENSE- pin (Pin 8),
as shown in Figure 19.
Figure 19. Programming Output Voltage With A Resistor
The trim resistor RTRIM for a desired output voltage
can be calculated using the following equation:
,
591
.
0
182
.
1
OUT
TRIM
V
R
k
where:
VOUT = Desired (trimmed) value of output voltage V
RTRIM = Required value of the trim resistor in k
If the RTRIM 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
V0UT, V
Calculated
RTRIM, k
Standard Value of
0.1% Resistor, k
0.8
5.65
5.62
1.2
1.94
1.93
1.5
1.3
1.30
1.8
0.98
0.976
2.5
0.62
0.619
3.3
0.44
0.437
5.0
0.27
0.267
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
resistor 30.1k from ON/OFF pin to Vin.
The typical connections are shown in Figure 20.
Figure 20. Circuit Configuration For ON/OFF Function
CONTROL
INPUT
VIN
GND
ON/OFF
3
6
5
INPUT
VOLTAGE
4.32 k
Internal
Enable
Circuit
YEV09T20
Vin
VIN
GND
ON/OFF
YEV09T20
VOUT
3
6
1
5
PGOOD
4
TRIM
2
SENSE+
7
Rload
SENSE-
8
RTRIM
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