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參數(shù)資料
| 型號(hào)： | IDS121 |
| 英文描述： | 10W, Step-Down, Single Output DC/DC Converters |
| 中文描述： | 10W的，降壓，單輸出DC / DC轉(zhuǎn)換器 |
| 文件頁數(shù)： | 5/6頁 |
| 文件大小： | 243K |
| 代理商： | IDS121 |
Test Configurations
Peak-to-Peak Output Noise Measurement Test
Use a Cout 4.7uF ceramic capacitor.
Scope measurement should be made by using a BNC
socket, measurement bandwidth is 0-20 MHz. Position the
load between 50 mm and 75 mm from the DC/DC Converter.
Design & Feature Considerations
Remote On/Off
Positive logic remote on/off turns the module on during a
logic high voltage on the remote on/off pin, and off during a
logic low.
Negative logic remote on/off turns the module off during a
logic low and on during a logic high.
To turn the power module on and off, the user must supply
a switch to control the voltage between the on/off terminal and
the -Vin terminal.
The switch can be an open collector or equivalent.
A logic low is -0.3V to 1.2V.
A logic high is 3.0V to 5.0V.
The maximum sink current at on/off terminal during a logic
low is -100 uA.
The maximum allowable leakage current of the switch at
on/off terminal (3.0 to 5.0V) is 50uA.
Overcurrent Protection
To provide protection in a fault (output overload) condition,
the unit is equipped with internal current limiting circuitry and
can endure current limiting for an unlimited duration. At the
point of current-limit inception, the unit shifts from voltage
control to current control. The unit operates normally once the
output current is brought back into its specified range.
Output Ripple Reduction
A good quality low ESR capacitor placed as close as
practicable across the load will give the best ripple and noise
performance.
To reduce output ripple, it is recommended to use 22uF
capacitors at the output.
Input Source Impedance
The power module should be connected to a low
ac-impedance input source. Highly inductive source
impedances can affect the stability of the power module.
In applications where power is supplied over long lines and
output loading is high, it may be necessary to use a capacitor
at the input to ensure startup.
Capacitor mounted close to the power module helps
ensure stability of the unit, it is recommended to use a good
quality low Equivalent Series Resistance (ESR < 1.0[ at 100
KHz) capacitor of a 100uF for the 5V input devices and a 33uF
for the 12V and 24V devices.
Output Voltage Trim
Connecting the external resistor (Radj) between the Vadj
and +Vout pins decreases the output voltage to set the point
as defined in the following equation:
Thermal Considerations
Many conditions affect the thermal performance of the
power module, such as orientation, airflow over the module
and board spacing. To avoid exceeding the maximum
temperature rating of the components inside the power
module, the ambient temperature must be kept below 70°C.
The derating curves are determined from measurements
obtained in an experimental apparatus.
IDS100 Series
+Out
-Out
+Vin
-Vin
Single Output
DC / DC
Converter
Resistive
Load
Scope
Copper Strip
Cout
+
+Out
-Out
+Vin
-Vin
DC / DC
Converter
Load
DC Power
Source
+
-
Cin
+Out
-Out
+Vin
-Vin
Load
DC Power
Source
+
-
Fuse
On/Off
Vadj
Radj
IDS101 and IDS121 ==>Rx=2130[
Output Voltage range is 1.8-3.3VDC.
IDS112 and IDS122==>Rx=3840[
Output Voltage range is 3.0-5.0VDC.
VR1=
(Rx
．
1200)
．
(Vo-1.195)
(Rx
．
1.195) -[1200
．
(Vo-1.195)]
DUT
Position of air velocity
probe and thermocouple
50mm / 2in
Air Flow
15mm / 0.6in
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