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PDF IDS121 Data sheet ( Hoja de datos )
| Número de pieza | IDS121 | |
| Descripción | Single Output DC/DC Converters | |
| Fabricantes | Total Power International | |
| Logotipo |  |
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TOTAL POWER INT'L IDS100 Series
10W, Step-Down, Single Output DC/DC Converters
Key Features
y Efficiency up To 93%
y Output Current up to 2A
y MTBF > 1,500,000 Hours
y Low Cost
y Remote On/Off Control
y Low Output Noise
y Temperature Performance -25] to +70]
y Step-down Switching Regulator
y Overload Protection
y Standby Current 100uA only
High efficiency, wide input voltage range and low output noise define
IDS Series of non-isolated, step-down, switching DC/DC
converters.
The 3.3V and 5V output devices are respectively up to 93% efficiency.
All models are fully line and load regulated and maintain specified accuracy
over the impressively wide input voltage ranges of 4.75 to 13.6V for 3.3V
output, 6 to 16.5V for 5V output and 16 to 28V for 3.3V and 5V outputs.
Output ripple and noise are typically 30mV P-P.
The high efficiency of the IDS Series eliminates the need for thermally
conductive potting compound. Devices are specified for full-power operation
up to ambient temperatures of +70] Calculated MTBF (MIL-HDBK-217F)
is more than 1.5 million hours.
These simple-to-use power converters have no minimum load
requirements. They draw 1mA when unloaded and a mere 100uA in the
standby mode (On/Off Control turns off).
3.3V models have an output voltage adjustment range from 1.8 to 3.3V
and 5V models are adjustable down to 3.0V.
Block Diagram
Single Output
3:1
Wide Range
Remote on/off
Low Noise
Vout Adj.
High
Power
Density
More Power
+Vin
On/Off
-Vin
Switching
Regulator
+Vo
Adj.
-Vo
1 page  
IDS100 Series
Test Configurations
Input Source Impedance
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.
+Vin
+Out
Single Output
DC / DC
Converter
-Vin -Out
Copper Strip
Cout
Scope
Resistive
Load
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.
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.
+
DC Power
Source
-
+Vin
+ DC / DC
Converter
Cin
-Vin
+Out
-Out
Load
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:
VR1=
(Rx．1200) ．(Vo-1.195)
(Rx．1.195) -[1200．(Vo-1.195)]
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.
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.
+
DC Power
Source
-
Fuse
+Vin
-Vin
On/Off
+Out
-Out
Vadj
Load
Radj
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.
Position of air velocity
probe and thermocouple
15mm / 0.6in
50mm / 2in
Air Flow
DUT
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet IDS121.PDF ] | |
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