- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄63407 > 12S5.3500SD 1-OUTPUT DC-DC REG PWR SUPPLY MODULE PDF資料下載
參數(shù)資料
| 型號(hào)： | 12S5.3500SD |
| 元件分類： | 電源模塊 |
| 英文描述： | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| 文件頁(yè)數(shù)： | 5/6頁(yè) |
| 文件大小： | 70K |
| 代理商： | 12S5.3500SD |
A
11 to 17 Watt SD Single Series DC/DC Converters
Manufacturing Company, Inc. Concord, California 94520 Ph: 925/687-4411 or 800/542-3355 Fax: 925/687-3333 www.calex.com Email: sales@calex.com
5
Remote ON/OFF Pin Operation
The remote ON/OFF pin should be tied to -Input if this function
is not used. The best way to drive this pin is with a CMOS or
TTL gate. An open collector or relay contact may also be used
in conjunction with a 2.2 to 50 kohm resistor tied to +Input.
When the ON/OFF pin is high 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
capacitor fully charged. This prevents the large inrush current
spike that occurs when the +input pin is opened and closed.
The OFF state current is typically less than 5 A. Leakage
in external components may increase this value.
Temperature Derating
The SD Single series can operate up to 85°C case temperature
without derating. Case temperature may be roughly calculated
from ambient by knowing that the SD Singles case temperature
rise is approximately 20°C per package watt dissipated.
For example: If a 12S5.3500SD converter is outputting 10
Watts, at what ambient could it expect to run with no moving
air and no extra heatsinking?
Efficiency is approximately 90%, this leads to an input
power of 11 watts. The case temperature rise would be 1 watt
× 20 = 20°C. This number is subtracted from the maximum
case temperature of 85°C to get: 65°C.
This example calculation is for an SD single without any
extra heat sinking or appreciable air flow. Both of these factors
can greatly effect the maximum ambient temperature (see
below). Exact efficiency depends on input line and load
conditions, check the efficiency curves for exact information.
This is a rough approximation to the maximum ambient
temperature. Because of the difficulty of defining ambient
temperature and the possibility that the loads dissipation may
actually increase the local ambient temperature significantly,
these calculations should be verified by actual measurement
before committing to a production design.
Heat sinking action can be improved by forced air over the
length of the converter or by using the SMT package and
placing the SD flat against a copper ground plane. The use of
a thin structural adhesive or thermal epoxy can increase the
heat conduction into the ground plane.
A heat sink can also be clamped or thermally glued to the
length of the SD. Suitable heat sinks made for DIL IC packages
can reduce the thermal impedance by 50% or more with
forced air.
Ultra Low Noise Output Circuit
The circuit shown in figure 2 can be used to reduce the output
noise to below 20 mV P-P over a 20 MHz bandwidth. Size
inductor L1 appropriately for the maximum expected load
current. C1 and C2 are United Chemi-Con 1200F, 6.3 volt
SXE types or equivalent.
Figure 2.
For very low noise applications this circuit will reduce the output
noise to less than 20 mV P-P over a 0-20 MHz bandwidth. Be sure
to size the inductor appropriately for the maximum expected load
current.
Operation With Very Light Loads
At output loads less than about 25% of rated load, the SD
single will operate in a “Burst Mode”. That is the SD will cease
PWM operation and instead operate in more of a burst mode.
This mode significantly increases the light load efficiency of
the SD single. Under these conditions the output of the SD will
contain a larger than normal (compared to full load) output
noise, but at a lower frequency.
If this is a problem in your application the SD single may be
used with a dummy load resistor to keep the static output
current above about 25% load (check the exact value required
by your circuit). Another alternative is to connect an inexpensive
1000 to 10,000 F output capacitor with an ESR of 0.075 to 1
ohm to the output. This will help to dampen the low frequency
output ripple without upsetting the dynamic operation of the
SD.
Perhaps the best solution to the “No Load” condition is to
use the ON/OFF pin to control no load operation and shut the
converter down totally.
Dynamic response of the SD single will degrade when the
unit is operated with less than 25% of full rated power.
Grounding
The input and output sections are connected together internally
(not isolated). The best way to operate the converter is by
using the -Input and -Output pins independently. That is the
input source to output circuit connections should be through
the converter itself. This is shown in figure 1. The converter
may also be operated with the -Input and -Output pins
connected to a common ground plane. This can create an
“Extra” ground loop and may increase the output noise
depending on the impedance of the extra loop.
L1
= 30H / 3.5 AMP INDUCTOR
C1, C2
= SEE TEXT
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| 5S48.150 | 1-OUTPUT 7.2 W DC-DC REG PWR SUPPLY MODULE |
| 5S48.65CD | 1-OUTPUT 3.12 W DC-DC REG PWR SUPPLY MODULE |
| 5SD915-25-3CC | BAND PASS FILTER |
| 5SFB-3500/X5500-SMP | BAND REJECT FILTER |
| 5ST12.5-R | TIME LAG BLOW ELECTRIC FUSE, 12.5A, 250VAC, 35A (IR), INLINE/HOLDER |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 12S74 | 制造商:HONEYWELL CLAROSTAT 功能描述:382-0035-6000REV0V |
| 12S97 | 功能描述:工業(yè)移動(dòng)感應(yīng)器和位置傳感器 RESISTIVE & OPTICAL RoHS:否 制造商:Honeywell 輸出類型:Analog - Current 電壓額定值:12 VDC to 30 VDC 線性:+/- 0.0011 % 溫度范圍:- 40 C to + 85 C 總電阻: 容差: 類型:Rotary Sensor |
| 12SA | 制造商:Amphenol Spectra-Strip 功能描述: |
| 12SBH221A-GR | 功能描述:電池座、電池扣和電池接頭 2C WIRES BLK W/COVER RoHS:否 制造商:Eagle Plastic Devices 產(chǎn)品:Battery Snaps 電池組電池大小:9 V 電池?cái)?shù)量:1 端接類型:Snaps 顏色:Black 材料:Polyvinyl Chloride (PVC) 安裝風(fēng)格:Snap-In |
| 12SBH221AS-GR | 功能描述:電池座、電池扣和電池接頭 2C W/COVER-SWITCH RoHS:否 制造商:Eagle Plastic Devices 產(chǎn)品:Battery Snaps 電池組電池大小:9 V 電池?cái)?shù)量:1 端接類型:Snaps 顏色:Black 材料:Polyvinyl Chloride (PVC) 安裝風(fēng)格:Snap-In |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。