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YH09T40 40A DC-DC POL Converter
5V to 13.8V Input ? 0.6V to 3.63V Output
Data Sheet
45
6.
6.1
Application Information
Input and Output Impedance
40
35
The POL converter should be connected to the DC
power source via low impedance. In many
applications, the inductance associated with the
30
25
20
20
NC
100 LFM
200 LFM
300 LFM
400 LFM
30
40 50
Ambient Temperature (C)
60
70
distribution from the power source to the input of the
converter can affect the stability of the converter.
Internally, the converter includes 60 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 150 μ F decoupling capacitor placed as close as
Figure 14. Output Current Derating at Vo=1.8Vdc
45
40
35
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 470 μ F POS, tantalum, or ceramic output capacitor
is recommended to improve output ripple and
dynamic response.
It is important to keep low resistance and low
30
25
NC
100 LFM
200 LFM
300 LFM
400 LFM
inductance of PCB traces for connecting load to the
output pins of the converter in order to maintain good
load regulation.
20
20
30
40 50
Ambient Temperature (C)
60
70
6.2 Output Voltage Programming
The output voltage can be programmed from 0.6V to
Figure 15. Output Current Derating at Vo=2.5Vdc
45
3.63V by connecting an external resistor R TRIM
between Trim+ pin (Pin 8) and Trim- pin (Pin 7), as
shown in Figure 17.
40
12,13
VIN
YH09T40
11
SENSE+
1,2,3
VOUT
35
Vin
6
9
ON/OFF
Power Good
TRIM+
TRIM-
8
7
R TRIM
Rload
30
25
NC
100 LFM
200 LFM
4,5
GND
GND
SENSE-
4,5
10
300 LFM
20
400 LFM
20
30
40 50
60
70
Figure 17. Programming Output Voltage With A Resistor
Ambient Temperature (C)
Figure 16. Output Current Derating at Vo=3.3Vdc
The trim resistor R TRIM for a desired output voltage
can be calculated using the following equation:
R TRIM ?
1 . 2
V OUT ? 0 . 6
, k ?
ZD-02095 Rev. 1.1, 18-Jun-10
www.power-one.com
Page 9 of 13
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