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參數資料
| 型號： | 5S5.2000LV |
| 元件分類： | 電源模塊 |
| 英文描述： | 1-OUTPUT 12 W DC-DC REG PWR SUPPLY MODULE |
| 文件頁數： | 5/8頁 |
| 文件大小： | 133K |
| 代理商： | 5S5.2000LV |
A
12 Watt LV Single Series DC/DC Converters
2401 Stanwell Drive Concord, California 94520 Ph: 925/687-4411 or 800/542-3355 Fax: 925/687-3333 www.calex.com Email: sales@calex.com
5
3/2001
Nichicon
PR and PF series
Suggested Part:
UPR1E222MRH
2200uF, 25V, 105°C Rated
ESR=0.053 ohms
Allowable Ripple at 85°C = 1.98 A
Panasonic
HFG and HFQ Series
Suggested Part:
ECEA1EFE332L
300uF, 25V, 105°C Rated
ESR=0.045 ohms
Allowable Ripple at 85°C = 1.94 A
Remote ON/OFF Pin Operation
The remote ON/OFF pin may be left floating if this function is
not used. The best way to drive this pin is with an open
collector/drain or relay contact.
Do not drive this input from a logic gate directly. The ON/
OFF pin must be left floating to turn the converter on and
insure proper operation. This input is noise sensitive so it
should not be routed all over your PCB.
When the ON/OFF pin is pulled low with respect to the -
Input, the converter is placed in a low power drain state. The
ON/OFF pin turns the converter off while keeping the input
bulk capacitors fully charged, this prevents the large inrush
current spike that occurs when the +input pin is opened and
closed.
The ON/OFF pin should never be pulled more that 0.3 volts
below the -Input or have a voltage of greater than +2 volts
applied to it.
Applying The Output
Figure 3 shows typical output connections for the LV Single.
In most applications no external output capacitance will be
necessary. Only your normal 1 to 10 F tantalum and 0.001
to 0.1 F ceramic bypass capacitors sprinkled around your
circuit as needed locally are required. Do not add extra output
capacitance and cost to your circuit “Just Because”.
Figure 3.
The LV Single may be directly connected to your load without any
external components required for most applications. Transient
overvoltage diode D1 may be added for extra protection against
output faults or if the input has the possibility of being shorted to the
load.
If you feel you must add external output capacitance, do
not use the lowest ESR, biggest value capacitor that you can
find! This can only lead to reduced system performance or
oscillation. See our application note “Understanding Output
Impedance For Optimum Decoupling” for more information.
Output Power
The available output power of the LV Single is reduced when
operating below 4.6 volts. See the “Low Voltage Power” curve
for more information. In general, from 4.6 to 16 volts full power
is available from the LV Single. Below 4.6 volts input the
available output power is linearly derated from 100% at 4.6
volts to 50% at 3.5 volts. For example a 5S12.1000LV is
capable of providing 6 watts of output power at 3.5 volts input.
Ultra Low Noise Output Circuit
The circuit shown in figure 4 can be used to reduce the output
noise to below 5 mV P-P over a 20 MHz bandwidth. Size
inductor L1 appropriately for the maximum expected load
current. All of the ground connections must be as short as
possible back to the CMN pin. The filter should be placed as
close to the LV Single as possible, even if your load is at some
distance from the converter.
Figure 4.
This circuit can reduce the output noise to below 5 mV P-P over a
20 MHz bandwidth. Size inductor L1 appropriately for the maximum
expected load current. All of the ground connections must be as
short as possible back to the CMN pin.
Operation With Very Light Loads
The LV Single conserves power when operating at very light
loads by operating in a burst power mode. This may cause the
output noise to increase with a repetition rate of 10’s of
milliseconds. If this causes a problem the LV Single may be
operated with a pre-load of about 5% of it’s full rated power.
The exact value will depend on the external components in
your system.
Turning the converter OFF with the remote ON/OFF pin is
an attractive alternative when your load needs to be shut
down.
Dynamic response of the LV Single will degrade when the
unit is operated with less than 25% of full rated power.
L1 = 10H
C1 = 100F / 25V, ALUMINUM
C2 = 10F / 25V, TANTALUM
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